Storm Record · Columbia, Dane, Dodge, Sauk, Walworth, Waukesha Counties
August 10, 2021: Straight-line wind across six counties
77
Strongest gust
6
NWS reports
What the National Weather Service recorded
A complex of storms moved out of Iowa and into southern and central Wisconsin on August 10th. This complex morphed into a line of strong to severe thunderstorms, which marched eastward and gained strength as it approached Lake Michigan. Widespread tree damage and power outages were reported.
Source: NOAA Storm Events Database · episode 160680
Every report, in the Weather Service's words
Where It Hit
| Location | County | Hazard | Size | Report |
|---|---|---|---|---|
| Oconomowoc (1 S) | Waukesha | Wind | 77 mph wind | Numerous reports of a number of large trees snapped and uprooted trees across Waukesha County. Winds were estimated to be upward of 60 mph, with locally higher gusts across the southern portion of the county. Wind measurements near Eagle, WI of 68 to 77 mph were observed. A large tree fell on a house causing significant damage near Eagle, WI. A business marquee sign was knocked over in Waukesha. Hail of three-quarters of an inch was also observed. |
| Black Earth (.69 N) | Dane | Wind | 60 mph wind | Multiple reports of trees and power lines downed across Dane County. Cities impacted were Black Earth, Cross Plains, Middleton, Madison, Oregon, and Cottage Grove. |
| Portage (.85 SW) | Columbia | Wind | 60 mph wind | Wind speeds were estimated by trained spotter. Branches were downed and a house was struck by lightning in the area. |
| Pell Lake (.86 NE) | Walworth | Wind | 60 mph wind | Winds were estimated, with reports of power outages in the Broomfield area. |
| Spring Green | Sauk | Wind | 58 mph wind | Small tree branches down in Spring Green. |
| Portland (2.94 NNE) | Dodge | Wind | 58 mph wind | Power lines downed in the town of Portland and Beaver Dam. Tree damage on the northeast side of Watertown. |
Service areas this storm touched