Power Outage in Pittsburgh, PA

Top wind gust reports included 55 MPH at Allegheny County Airport, 53 MPH at a PADOT sensor on I-79 at Steubenville, and 52 MPH at Pittsburgh International Airport. One person was hospitalized when a tree fell on a car on the 800 block of North Lincoln Avenue in North Shore. Another car was damaged by a tree on 5th Avenue in East Mckeesport, with no injuries. Roof damage occurred to an apartment complex at Mount Lebanon, and siding was damaged on homes in Bon Meade. Several other reports of downed trees were received, including a report of one to two dozen downed in Stoop Ferry, which caught fire when a power pole was also involved.

High wind gusts accompanied a strong low pressure system on December 23rd and continue into December 24th. Measured wind gusts across western PA ranged between 40 to 50mph, sustain winds exceed 30mph. Isolated power outages occurred. A 59mph wind gust was measured near Bellefield, PA in Allegheny County. Allegheny Airport also gusted to 56mph.

Power lines reported down.

Power lines reported down.

Power lines down.

Large tree limbs and power poles down/broken.

A couple of high voltage power lines were downed along Melwood Avenue.

Numerous trees and power lines were reported down across the city of Pittsburgh.

A citizen reported tree limbs and power poles down.

Social media report of many downed trees and power outages. Picture of a tree down along 5th Avenue.

A 911 Call Center reported trees and power lines down at the intersection of Beaver Street and Glen Mitchell Road.

Power lines were blown down on Banksville Road.

Numerous trees were snapped or uprooted, bringing down power lines as well.

Trees and power lines were blown down on Bausman Street.

Trees and power lines were downed on Wible Run Road at Hillwood Road.

Trees and power lines were blown down in Millvale.

Trees were reported to be blown down, causing power outages.

In Renton Junction, there was a report of numerous trees being blown down, resulting in power outages.

Social media report of tree and power lines down along 2800 Block of Sarah Street. Time estimated by on radar.

Power lines were blown down on Washington Pike.

Power poles and wires were reported down.

Power poles were blown down, with live wires causing a road closure at the 3900 block of Brentwood Road.

An NWS Employee reported trees and power lines down and blocking Route 51 near the Montour Sports Complex.

Local law enforcement reported power lines down 3030 Fredrick Street.

Several instances of downed trees and power lines were reported.

A large tree was blown down in a yard, and power lines were also downed around the area of the border between Mount Lebanon and Castle Shannon.

The county emergency manager reported that several trees and power lines were blown down.

The county emergency manager reported that trees and power lines were blown down.

A social media user reported that a tree and power lines were down at the intersection of Oliver Way and Lincoln Way.

Several gusts of 50 MPH or greater were recorded at both Pittsburgh International Airport and Allegheny County Airport. The peak value at AGC was 61 MPH, recorded at 912 PM on February 24 and 1203 AM on February 25. At PIT, 61 MPH was also recorded, occurring at 820 PM on February 24. A National Weather Service employee noted a tree blown down on Shafer Road near the NWS office. County 911 officials reported that a tree had been blown on to a house in Harrison Township. A telephone pole was blown into a building in Etna. A large tree and power lines were blown down in Castle Shannon. Another large tree was blown on to a house in Kennedy Township.

The NWS Pittsburgh office has light icing in parking lot; cars glazed over. Another NWS Employee measured 0.01 inches of freezing rain at their home in Lawrenceville,PA. The Pittsburgh International Airport measured a trace. Other reported areas impacted by glazed ice from the public: McCandless Township, McKeesport, Bethel Park, Brentwood, Crafton, Avalon, West Mifflin, Dormont, Forest Grove. 16,000 customers were without power across the county. Source: https://pittsburgh.cbslocal.com/2018/11/16/winter-storm-power-outages-thousands-affected/.

An emergency manager reported that McNeilly Road and Pearce Road were closed due to trees and power lines being down.

An emergency manager reported a tree down with live power lines near Linden Grove and southwest of Salida. A trained spotter also reported an uprooted tree near Longview as well as trees down along Robert Drive.

State official reported a tree down on power lines along Mayview Road.

State official reported that Freeport Road was flooded in several locations including at the intersection of Powers Run Road and Boyd Road.

Local 911 reported a power pole and trees down around Hampton Township.

County official reported Stilley Road closed due to downed power lines between Route 51 and Prospect Road.

A trained spotter reported power lines down.

Emergency management reported trees and power lines down.

The public reported multiple trees and power lines down in and around Upper St. Clair.

Emergency manager reported several trees down and 8 to 10 power poles down.

The Department of Highways reported trees and power lines down.

Law enforcement reported trees and power lines down, starting a fire.

Law enforcement reported trees and power lines down.

The 911 Call Center reported trees on power lines.

The 911 Call Center reported trees and power lines down on Pleasant street at Amanda Avenue.

The 911 Call Center reported trees and power lines down.

The 911 call center reported a large tree and power lines down on a house.

State official reported water up to the doors of cars on Freeport Road and Powers Run Road.

State official reported water up to the doors of cars on Freeport Road and Powers Run Road.

Broadcast media reported downed trees and power lines blocking Stonelea and Hiawatha Streets.

A trained spotter reported trees and power lines down in Penn Hills.

The 911 call center reported a tree down on a house and power lines down.

The 911 call center reported trees down on a home and power lines down.

A trained spotter reported power lines down.

The 911 call center reported power lines down.

A trained spotter reported power lines down.

The 911 call center reported trees and power lines down.

The 911 call center reported trees and power lines down.

The 911 call center reported trees down on power lines.

The 911 call center reported trees and power lines down.

The 911 call center reported trees and power lines down.

A NWS storm survey found a snapped power pole and snapped hardwood trees.

State official reported multiple trees and power lines down blocking PA Route 48.

Law enforcement reported trees and power lines down.

Winds gusted to over 50 MPH across parts of Allegheny county with a few reports of trees and power lines down in and around Pittsburgh.

Law enforcement reports of trees and power lines down in Pittsburgh.

A 66 MPH wind gust was reported at the Allegheny County Airport in West Mifflin. Trees and power lines were reported down around West Mifflin.

A trained spotter reported a utility pole snapped. Trees and power lines were alos reported down by law enforcement across much of western Allegeny county.

Pittsburgh City public works reported 25 to 30 large trees down with power lines in the South Hills along and near Brownsville Road.

A trained spotter reported numerous trees and power lines down in White Oak Borough.

Emergency management reported trees and power lines down in Mount Lebanon as well as Baldwin Borough.

Emergency management reported trees and power lines down in Mount Lebanon as well as Baldwin Borough.

Amateur radio reported trees and power lines down near the Mt Nebo exit of I-79 in Wexford. Some roads reported closed.

Emergency management reported trees and power lines down in Franklin Park.

Emergency management reported power lines down around Bradford Woods.

Emergency management reported numerous trees and power lines down.

Emergency management reported trees and power lines down near the Ross Park Mall.

An NWS Survey found and EF0 tornado touched down in the West End area of Pittsburgh affecting areas along Toledo, Municipal, and Greenway Streets. Numerous trees were snapped and power lines were down. There was some structural damage to a few homes and buildings. Maximum estimated winds were 85 MPH.

Numerous trees and power lines down.

Numerous trees and power lines down.

Trees and power lines down.

A microburst, with 60 mph winds (52 kt), caused damage on a narrow path, mainly on 10th Ave, 11th Ave, Martha St, and Ravine St in Munhall and Homestead. The damage was 100 yards wide and 200 yards long. 34 homes had twisted awnings, and damage to roofs, siding, rain gutters. Some trees were blown down, and one fell on a house. 400 customers lost electric power.

Trees and power lines blown down.

Trees down. 2000 customers lost electric power.

8 houses suffered damage, such as roofs damaged and siding blown off. An industrial building lost part of its roof in Millvale, along Route 28. 60,000 customers lost electric power.

A few trees and power lines blown down by wind along Banksville Rd and Highland Park.

Power lines blown down by wind in Shadyside section of Pittsburgh.

Trees and power lines downed by wind. 7000 customers lost electric power.

Numerous large trees downed by wind. A microburst hit Moon Twp, moved east northeast across the townships of Ross and Shaler, to near Natrona Heights. In Natrona Heights, the microburst was one quarter to one half mile wide, and produced a wind of 70 to 90 mph. In the North Hills of Pittsburgh, skywarn spotters reported some roads still blocked by fallen trees beyond 1:40 AM EDT on 9th. 6000 customers lost electric power.

Thunderstorm winds downed a few trees and power lines.

Thunderstorm winds downed numerous trees and power lines in the McKeesport area. A few of these trees fell onto houses, causing minor damage. In addition, the straight-line winds took hold of 10 trailers chained together at a home improvement center and blew them onto the nearby highway.

Thunderstorm winds downed several trees and power lines.

Low pressure tracked from the Lower Mississippi Valley on the morning of the 3rd towards the northeast U.S. coast on the morning of the 4th. Ahead of the low, ideal conditions for enhanced downslope wind existed along west-facing slopes of Indiana, Westmoreland and Fayette Counties, as strong southeast flow underneath an inversion at ridgetop accelerated as it progressed downslope, creating many measured wind gusts of 50 to 60 MPH on the 3rd. Localized 70 MPH wind, although not measured, likely occurred as well. Damage was most concentrated along the west-facing slopes of Fayette and Westmoreland, with many reports of tree and structural damage. Power outages were also widespread, with over 28% of Fayette County out at one point during the event. A Declaration of Disaster Emergency was issued for the county in the wake of the wind at noon on the 4th, with the city of Connellsville also issuing a local declaration.||Incidents of wind damage were more isolated in other portions of southwest Pennsylvania, as wind gusts were slightly less severe, generally topping out at around 50 MPH.

A low pressure system rapidly intensified December 22nd to December 23rd as the center of the low moved from the Midwest across the Great Lakes. A flash freeze, strong wind gusts, and dangerously cold temperatures were recorded across the region. Record low maximum temperatures were broken at several climate sites. Widespread power outages were noted by utility companies, isolated areas experienced internal damage from frozen pipes, and hazardous travel was noted due to a flash freeze (rain quickly changed to snow) with rapidly dropping temperatures.

A few rounds of thunderstorms on July 24th and 25th preceded a cold frontal passage. High levels of instability, ample shear, and pre-frontal disturbances provided thunderstorm clusters producing widespread damaging wind gusts. Many instances of tree and power line damage were noted, along with isolated instances of structural damage. One of those instances of structural damage, a tree falling on to two trailers in Venango County, unfortunately led to the death of a 28 year old woman. Flash flooding of urbanized areas of Allegheny County also occurred.

A more widespread wind damage event finally occurred on July 23rd. A quasi-linear mesoscale convective system, originating over Illinois and Indiana, continued into a warm, moist, and unstable air mass over the Upper Ohio Valley. The line of storms crossed western Pennsylvania during the early to middle afternoon hours, with widespread wind damage to trees and power lines resulting. Several reports of large hail, up to half-dollar size, were received as well.

Two waves of severe storms entered the Ohio River Valley on July 13th. The first, was in the early morning hours. Despite the lack of day time heating, instability was available due to warm, moist advection under southwest flow. Vertical wind shear was also available as a trough approached an area of high pressure and a created a pressure gradient.||During the afternoon, warm and unstable conditions prevailed; dew points stayed in the lower 70s. Mean-layer CAPE of 1500-2000 J/kg was able to develop. Due to a gradient between upper high pressure off the east coast and a shortwave trough moving northeast through the Ohio Valley, moderate mid-level flow characterized by 30-40 knots of 0-6km shear prevailed. This allowed storms to organize into multicellular storm clusters and short line segments. Many wind damage reports were received, mainly to trees and power lines, although a few reports of structural damage were also noted.

A nearly stationary front remained to the north of the region on July 7th. An upper trough dug across the Great Lakes during the daytime hours as well. While better upper-level forcing remained to the north, return flow increased between this trough and the tropical system Elsa to the southeast. An abundant amount of moisture and warm air was thus funneled into our region. Deep-layer shear was weak, but enough instability and dry air aloft was present to promote many instances of damaging wind gusts. Damage to trees and power poles was fairly widespread, and there were a few instances of structural damage as well. Planes were overturned by wind at Butler Airport, and Edgewood Borough declared a local state of emergency due to thunderstorm wind damage. ||Multiple rounds of thunderstorms also lead to flash flooding concerns in the urbanized areas of Allegheny County. Several instances of stuck vehicles were reported, and several homes were evacuated for a time in Bridgeville due to creek flooding.

Instability was able to build ahead of a cold front on May 26th. CAPE values of 1500 to 2000 J/kg were achieved by afternoon, with sufficient wind shear and frontal support for lines of strong to severe thunderstorms. Although a few reports of penny to quarter-sized hail were received, wind damage was the primary impact. Many reports of downed trees were received, causing scattered power outages and blocked roads. A few reports of damage to cars and structures were received, with a patio roof blown off in Greensburg.

Strengthening low pressure tracked across the Great Lakes and into the northeast CONUS on March 26th. With the surface low track and low-level jet positioning both favorable, strong wind gusts were able to develop in the deep mixing behind a cold front. Numerous surface wind gusts in the 40 to 60 MPH range were recorded from the predawn hours into the early afternoon.||Widespread reports of tree and wire damage were received from southwest Pennsylvania. A few incidents of structural damage were noted, chiefly in Beaver and Allegheny Counties. West Penn Power reported over 17,000 customers without power at one point during the morning, with Duquesne Light seeing 6,767 outages.

As a weak cold front dropped south from the Great Lakes on the afternoon of August 27th, a line of thunderstorm was able to develop ahead of the boundary, with a lake breeze off of Lake Erie also aiding initiation. Sufficient shear plus a strong mid-level jet combined with an unstable environment to create a good severe threat as the storms move to the ESE. The Storm Prediction Center anticipated the threat, placing the region under a slight risk of severe storms. Damaging wind ended up being the primary concern, as many reports of tree and power line damage were received. In a couple of instances, automobiles became involved. At least 55,000 electrical customers across southwest Pennsylvania were without power at one point during the storms. Minor structural damage was reported in a few cases.

Warm, moist advection during the morning and early afternoon hours of the 10th led to humid and very warm conditions. Mean-layer CAPE of around 2000 J/kg, highest over eastern Ohio, illustrated the very unstable conditions. A few discrete thunderstorm cells were able to form over southwest PA initially, with a few hail and wind damage reports. However, the bulk of the severe weather was the result of the passage of a negatively-tilted upper trough and a strong cold front, which crossed during the late afternoon and evening hours. Bulk shear of 40 to 50 knots and the cold front allowed for the development of a quasi-linear convective system, resulting in widespread reports of wind damage. Gusts of 70-80 MPH were estimated in some cases, leading to numerous reports of damage to trees and power lines, as well as mostly minor structural damage to roofing and shingles. Mesovortices in the QLCS also led to the development and confirmation of three tornadoes in the NWS Pittsburgh forecast area. The strongest was in Beaver County PA, with EF1 damage observed.

A crossing shortwave trough, as well as a remnant mesoscale convective vortex from convection the previous night, acted as a trigger for another round of severe thunderstorms on the 4th of June. Surface-based CAPE of 1500-2000 J/kg and deep-layer shear of 30-40 knots set up the region for organized severe weather. Storms initiated in central Ohio around midday and then congealed into a line which swept across the upper Ohio Valley through the middle to late afternoon hours. Severe weather reports were mainly limited to tree and power line damage, with only a few reports of damage to structures and vehicles.

Broad ridging was in place across the Mississippi Valley on the morning of the 7th, with the Upper Ohio Valley region experiencing WNW flow aloft. After morning showers and thunderstorms moved across the area due to a warm front, the upper level flow regime brought an elevated mixed layer (EML) into the region during the afternoon, capping convection during the afternoon and early evening hours. ||Convective clusters over Michigan during the evening congealed into a mesoscale convective system (MCS) and raced across Lake Erie, arriving in the NWS Pittsburgh forecast area shortly before midnight. Steep mid-level lapse rates thanks to the EML allow for a few large hail reports initially. However, the main impact of the system would be from wind. Surface temperatures surged into the low to mid 60s ahead of the line on gusty southwest winds, resulting in surface CAPE of 1000 J/kg and a significant curving/lengthening of the hodograph. With the boundary layer no longer decoupled, strong ambient mid-level flow combined with highly efficient evaporational cooling in the convective downdrafts allowed substantial downdraft CAPE to be realized with surface wind gusts exceeding 70 mph observed and evident over a wide area given the volume of wind damage reports. Embedded vortices in the quasi-linear convective system also led to five tornadoes in the EF0/EF1 range during this event across the region.||Numerous instances of tree and structural damage were observed, including damage to planes and hangars at Arnold Palmer Regional Airport. Strong winds also tore off part of the roof of St. Mary of Czestochowa Church on Kenneth Avenue in New Kensington. Over 50,000 area electrical customers were without power in the wake of the storms, according to the Pittsburgh Post-Gazette.

A strong mid-level trough swung across the Plains and the Great Lakes on the 31st. The trough took on a negative tilt as it crossed the middle and upper Ohio Valley during the evening. Deepening surface low pressure rode northward into the eastern Great Lakes as well, which pushed a cold front across the region during the evening. An unseasonably strong feed of moisture developed ahead of this system, triggering heavy rainfall. 1 to 2 inches of rain fell across southwest Pennsylvania, with isolated higher totals of up to 2.5 inches. This led to several reports of road and small-stream flooding in the region.||In addition, the negatively tilted trough, strong pressure gradient, and mixing provided by the cold front led to a period of high winds across the region. Many gusts of 45 to 50 MPH were observed, with a high gust of 64 MPH reported in eastern Tucker County, WV. Many reports of tree and power line damage were received, and power outages numbered into the thousands of customers. Wind impacts were likely more widespread than reported.

A weak, low-amplitude shortwave crossed the region during the daylight hours. Combined with sufficient instability, scattered thunderstorms were able to develop during the afternoon. The strongest storms, and thus the bulk of the severe weather reports, occurred near and north of Pittsburgh, where synoptic support was maximized. ||Sufficient mid-level shear allowed storms to organize into a line over time, with the period of strongest activity occurring from 3:30 PM to 7:00 PM. Many reports of tree and power line damage were received. One injury occurred near Howe in Jefferson County, where a tree fell on a moving vehicle, injuring the driver when the windshield shattered.

Several ingredients were in place for scattered severe thunderstorms on August 8th. An upper shortwave trough embedded in northwest flow crossed the Great Lakes during the day. Moist west-southwest flow maintained dewpoints in the mid 60s, which in concert with daytime heating, fueled instability. Strengthening mid-level wind contributed to sufficient levels of shear, allowing an organized line of thunderstorms to cross the region in advance of a cold front. Steep low-level lapse rates promoted a damaging wind threat, but low-level shear was insufficient for a tornado threat. The Storm Prediction Center place the region under a slight risk of severe weather for the day.||Thunderstorms began to form in earnest in southeast Ohio around 4 PM, creating wind damage in Columbiana and Noble Counties, along with a large hail report. The storms formed an organized line and swept across southwest Pennsylvania and northern West Virginia through the late afternoon and early evening. Wind damage was mainly confined to Allegheny and Westmoreland Counties, with numerous reports of tree and power line damage.

Strong low pressure lifted from the central Plains on the morning of the 23rd into the western Great Lakes by the 24th. A cold front then rushed across the region during the late morning/early afternoon hours of the 24th. Some rain showers accompanied the front, but the main story was the prolonged period of damaging wind gusts that followed the frontal passage. A very tight pressure gradient, 3 hour pressure rises on the order of 7-8 mb/hr, and deep mixing of up to 700 mb allowed for the efficient downward transport of strong wind aloft. The result was an extended period of 40-60 MPH wind gusts across the region. Several reports of peak gusts of 60 MPH or greater were received.||The highest recorded gust was 74 MPH at a mesonet sensor east of Canaan Heights in Tucker County, WV. A number of peak wind gusts in excess of 60 MPH were observed as well. Pittsburgh International Airport recorded a gust of 61 MPH at 8:20 PM on the night of the 24th. This was the highest non-thunderstorm wind gust that had been recorded at that location since the airport opened in 1952. There were widespread reports of downed trees, power lines, and structural damage across the entire region, with some examples noted in the county entries. Thankfully, no injuries were reported from wind effects.||Power outages were widespread as well. First Energy reported a total of 97,000 Pennsylvania customers without power as of 10:30 PM on the evening of the 24th, with over 49,000 Duquesne Light customers in the Pittsburgh area without power as of that evening. Full restoration took multiple days due to the extent of damage and the initially unsafe working conditions due to the ongoing wind.

Southwesterly flow and moderate instability ahead of an approaching cold front helped to spawn showers and thunderstorms, some of which were severe, across the northern West Virginia pan-handle, and western Pennsylvania on the 7th. With dry air present aloft, several of the storms produced damaging wind gusts that brought down trees and power lines. Front slowed as it crossed into Pennsylvania early on the 8th, and with plenty of moisture, heavy rain became a threat overnight. Some flooding was reported in Allegheny county in Shaler and McCandless Townships.

A low pressure system, moving northeastward out of the plains toward the Great Lakes, lifted a warm front across the region during the morning and afternoon on the 3rd. Strong lift ahead of and along a warm front provided for a period of snow, sleet, and freezing rain across western Pennsylvania as cold air remained trapped at the surface. Most locations reported a trace to a few hundredths of an inch of ice. However, in northeastern PA, a prolonged period of freezing rain brought trees and power lines down, and caused several accidents. Over a quarter inch of ice was reported in Jefferson county, PA.

A tight pressure gradient with a powerful cold front produced wind gusts over 45 MPH in locations across eastern Ohio, western Pennsylvania, and the northern panhandle of West Virginia the evening of December 24th. Highest reported winds in Pennsylvania were 56 MPH in Du Bois, 55 MPH in Pittsburgh, 54 MPH at Latrobe, and 45 MPH near Mcmurray in Washington county. Highest winds in Ohio were 55 MPH at Zanesville, 52 MPH in Coshocton, and 45 MPH in Hanoverton in Columbiana county. Winds gusted to 55 MPH in Wheeling, WV.

A powerful cold front and upper level trough pushed across the Upper Ohio Valley on July 10th producing widespread severe weather and flash flooding from eastern Ohio, northern West Virginia, and western Pennsylvania. This included 3 separate tornadoes. One tornado occurred in Lawrence county, PA, with 2 additional tornadoes across portions of Tuscarawas and Carroll counties in Ohio.

The remnants of Sandy brought a variety of weather impacts to western Pennsylvania, eastern Ohio, northern West Virginia, and Garrett county Maryland as the storm made landfall and interacted with a cold front essentially right over the region. Heavy rain and strong winds combined to cause downed trees and power-lines in the lower elevations. Meanwhile, the higher elevations experienced blizzard conditions, with snow amounts in excess of 2 1/2 feet reported at elevations above 2500 feet.||Rain began on the 26th as the cold front slowly crossed the region and then stalled over the Appalachians. This cold front then interacted with Sandy as the storm made landfall on the 29th. In general, rainfall from the front and remnants of Sandy averaged 2 inches across much of eastern Ohio, northern West Virginia, and western Pennsylvania. Amounts in excess of 4 inches were reported in and and around Pittsburgh and parts of Westmoreland county, Pennsylvania. However, due to dry antecedent conditions, only minor flooding was reported across the region. ||The saturated ground did play in an important role later however, as the pressure gradient between the front and Sandy remnants strengthened. There were several reports of trees down and power outages across the lower elevations.||Cold air, wrapping around the system as it moved inland helped to change the higher elevations to snow early on the 29th. Snow accumulated rapidly, up to two inches per hour for much of the overnight hours on the 29-30th. Very low visibilities resulting in and indirect fatality in Tucker county. Snow amounts in excess of 2 1/2 feet were reported in Tucker and Preston counties in West Virginia and Garrett county, Maryland. Amounts of 8-12 inches were reported in the ridges of Fayette and Westmoreland county in Pennsylvania and even in portions of eastern Monongalia county in West Virginia. The heavy snow combined with the wind to down numerous trees and power-lines making those areas nearly impassable. The roof of a gas station in Terra Alta also gave way due to the weight of the snow. Almost 95% of residents in Preston, Tucker, and Garrett county were without power during the peak of the snow-storm, which outages lasting over a week in many locations.

Isolated convection developed along a cold front moving across the Upper Ohio Valley, causing some damage to trees and power lines.

A strengthening low pressure system crossed the upper Ohio Valley and Great Lakes on the 24th. Strong cold air advection and a tightening pressure gradient brought strong winds and snow showers and squalls to much of northwestern Pennsylvania, eastern Ohio, northern West Virginia and Garrett County Maryland. Wind gusts over 58mph were realized in multiple counties with damage in the way of downed trees, power lines, and numerous power outages. In addition, a Sheetz gas pump overhang in Ford City, Pennsylvania was blown over.

Winds gusted above 50 MPH at times behind a strong cold front crossing the Ohio Valley. Limited damage was reported mainly in and around Pittsburgh with a few branches and power lines down. The highest reported wind gusts were 46 MPH at Pittsburgh International Airport, 53 MPH at Allegheny County Airport, 51 MPH at Butler PA, 48 MPH at New Castle, PA, 53 MPH at Wheeling WV, and 51 MPH at Zanesville OH.

A shortwave traveling north over a broad ridge in the central U.S dragged a weak cold front over the Ohio Valley. This coldfront set off thunderstorms in the afternoon and evening hours on the 18th. There were several reports of wind damage in eastern Ohio and western Pennsylvania with more than 11,000 people without power in western PA alone. In addition urban flooding and flash flooding occurred in various parts of Allegheny and Beaver counties. Cars were stranded in high water right around rush-hour on Washington Blvd in downtown Pittsburgh.

High winds behind a strong cold front produced numerous reports of power lines and trees down across Allegheny county.

Strong winds behind a cold front caused wind damage over portions of Allegheny and Washington counties with large trees and wires down. Numerous power outages were reported.

A powerful storm system and associated cold front produced severe thunderstorms, high winds and a tornado across Western Pennsylvania, Southeast Ohio, Northern West Virgina, and Garrett county Maryland.

High winds blew down trees and power lines in Uniontown, Marion Center, Portersville, Derry, Upper Burrell, Barkeyville, Coraopolis, New Castle, Evans City, Limestone, Elders Ridge, Ohioville, Canonsburg, and Sharon.

A macroburst roared across eastern Allegheny and extreme western Westmoreland counties during the early evening hours of May 31st. This macroburst produced an approximately 10-mile long path of damage from the straight-line winds, which were estimated as high as 105 MPH. The macroburst damage path originated in the Homestead area of eastern Allegheny County, with the outflow winds traveling to the southeast through the towns of Whitaker, West Mifflin and Duquesne. The macroburst outflow then continued across the Monongahela River into the towns of McKeesport and North Versailles. Outflow winds from this macroburst continued to the southeast, weakening as it crossed into Westmoreland County, where it produced damage in several communities in North Huntington Township. By this time, the winds had decreased significantly, but were still strong enough to down numerous trees and power lines across the area. The maximum width of this macroburst was estimated at 3 miles as it traveled through the Munhall area. The highest concentrated area of damage extended from the Whitaker area to West Mifflin, where major damage occurred at the Kennywood Amusement Park. A large wooden pavilion which housed the "Whip" ride collapsed. As the pavilion collapsed it killed one person and injured 47 others. Just across the street from Kennywood, several homes sustained major damage from the winds as roofs were blown off and trees were blown onto homes. Kennywood Boulevard was impassible for a period of time following the storm as a tangle of power lines and traffic light, trees, roof debris and damaged vehicles blocked the highway. A total of approximately 75,000 customers were without power across eastern Allegheny County, with another 14,000 customers affected across Westmoreland County. Although power was restored to most homes by the next morning, some customer in the hardest hit areas of West Mifflin were without power for several days. Allegheny County officials placed initial damage estimates at $10 million.

A deepening area of low pressure moving eastward across the northern Great Lakes swept a strong cold front across western Pennsylvania during the late afternoon/early evening hours of the 9th. This intensifying low produced a large area of strong low-level winds, both ahead of and behind the cold front, with winds between 70 - 80 MPH present just a few thousand feet off the surface by the mid-afternoon hours. As showers formed during the day, these strong winds were occasionally brought down to the surface. To further complicate matters, by the late afternoon hours enough instability was present to produce a line of severe thunderstorms along the main cold front as it entered western Pennsylvania. This combination of strong gradient winds and severe thunderstorm winds produced widespread damage across the area, mostly in the form of downed trees and power lines. These high winds continued after the cold frontal passage, downing trees and power lines, until the early morning hours of the 10th. At that time, the surface low moved off into Quebec and the strong gradient winds finally diminished. It is estimated that around 25,000 people were left without electricity in western Pennsylvania in the wake of this wind event.

High winds associated with a deep area of low pressure passing over the region downed numerous trees and power lines across western Pennsylvania.

An intense area of low pressure passing over the region brought a prolonged period of high winds to western Pennsylvania. Although the highest recorded wind was only 60 MPH (at the Beaver Falls Airport, Beaver County), wind gusts to over 50 MPH continued from late morning into the early evening hours, downing numerous trees, large limbs and power lines across the entire area.

A strengthening area of low pressure and associated cold front swept across the area during the overnight hours, bringing high winds to much of western Pennsylvania. In general, damage was confined mostly to numerous downed trees and power lines, resulting in a loss of power to an estimated 150,000 homes across western Pennsylvania. However, several incidents of property damage were also reported. In Sharon, Mercer County, wind gusts estimated as high as 70 MPH blew a tree down onto a garage, causing considerable damage. Several homes in Sharon also had parts of their siding blown away. The highest wind in the event was an estimated 75 MPH gust in Farmington, Fayette County. Part of a roof was blown from a barn at that location. In Indiana County, the high wind damaged several residential roofs and produced isolated incidents of structural damage. Several residences and businesses in Beaver County reported property damage. A window was blown in at a fast-food restaurant in Conway. A pavilion at a park in Monaca was blown over. In Industry, a tree was blown onto a van, crushing it. In South Beaver, the roof was partially ripped off of an industrial supply company. A partially constructed house in the Beaver area was also blown down by the wind. In Armstrong County, a roof blew off of a building along Main Street in Elderton. In North Buffalo, the winds ripped off three-quarters of the roof of a monastery. In Allegheny County, these strong winds resulted in the loss of electricity to an estimated 100,000 homes across the county. In the city of Pittsburgh, two abandoned buildings had their walls blown in. Several reports were also received from across the city of porch awnings and sheds blown down by the wind.

A strong cold front associated with a deepening area of low pressure blew through western Pennsylvania during the afternoon of the 10th. Behind this front, strong winds gusting in excess of 50 knots were found across many counties in western Pennsylvania, resulting in numerous downed trees and power lines.