Power Outage in Anamosa, IA

Widespread straight-line winds that produced extensive damage were reported throughout Jones County, associated with a derecho. These winds lasted around an hour in total at any one location, even though the initial line of storms moved out quickly. Damaging straight-line winds continued and were associated with the rear inflow jet. Maximum wind speeds were estimated to be 80 to 100 MPH for much of the county, with an area of 100 MPH or higher in the south central part of the county. These estimates were determined based off damage reports and photos submitted through social media. The duration of strong winds caused extensive damage to most trees, powerlines, crops, and structures in their path. The widespread damage also resulted in long duration power outages.

Law enforcement relayed a report that a large tree branch snapped off and fell onto power polls in Anamosa.

A NWS COOP observer reported 8.5 inches of snow in Monticello, Iowa. Significant blowing and drifting snow was widespread over the area with white out conditions at times lingering through the day of February 12. Power outages from down power lines, power poles, and tree branch damage were widespread.

A trained spotter reported multiple trees and limbs were down on the north side of Anamosa. Some of the trees came down on power lines. The spotter also reported pea to dime sized hail.

The county emergency manager reported trees, limbs and power lines down in Anamosa. Three homes were damaged by trees falling on them.

A narrow EF2 tornado with winds estimated at 120 mph touched down in a field about 4 miles north of Monticello and tracked east northeast from Jones County crossing into Delaware County. The tornado struck neighboring farmsteads at the junction of 148th Ave. and Jones-Delaware County Road. Two grain bins and seven outbuildings were destroyed. Two garages had the doors blown in and five wooden power poles were snapped, including three larger transmission lines. The most unusual damage was an 18 foot missile that was formed from four sections of a grain bin roof that were folded into a narrow cone shape and propelled into the garage attic over 100 yards away. This EF2 tornado began in Jones County, and moved into Delaware County.

The county emergency manager reported power lines down and the roof blown off a machine shed at the intersection of county road X44 and highway 64 south of Amber.

A COOP observer reported trees down and no power.

A trained spotter reported 15 hundredths of an inch of ice accumulation in Olin with no power.

Wind gusts estimated to be 70 mph blew down several large trees in Anamosa, IA at 1250 pm CDT June 18. One tree fell onto a house. Power outages were also observed. The local paper later reported that most of the tree damage occurred north of Main Street.

Spotter reported hearing trees and power lines down on scanner

Squall line left Linn County between Waubeek and Springville and entered Jones County around 1755 CST (2355 UTC). Anamosa took a direct hit with winds estimated around 61 knots (70 mph) during 1758-1808 CST from a trained spotter and co-op observer. At this point, a book end vorticy began developing across the northern part of the county. The bookend vorticy moved in an east southeast direction from Monticello to the Jones/Jackson county line, passing north of Center Junction and Onslow. A brief power interruption occurred at the KMXO AWOS with the arrival of the gust front during 1808-1813 CST with winds gusting to 35 knots (40 mph) prior to the outage. Power came back for 1 minute at 1814 CST before failing completely with the arrival of the bookend vorticy. Winds estimated of at least 61 knots (70 mph) hit Monticello during 1814-1821 CST with numerous trees and power lines down. A few homes and a car dealership on the south side of Monticello sustained roof damage and broken windows. From Monticello to the Jones/Jackson county line, a spotter reported trees down 1.6 miles southeast of KMXO on 190th Street near Pictured Rocks State Park during 1819-1825 CST. The local newspaper reported a dented grain bin on the Welter farm 9.0 miles east southeast of KMXO along highway 136 during 1836-1842 CST.

Large tree blown down on power lines.

Power lines, trees and limbs blown down. About 30 houses suffered either minor or major damage.