Wednesday, July 19, 2017
Severe Weather Threat Wednesday Evening
A 'wake low' has developed over southern Wisconsin along the back edge of thunderstorms. This is not severe, however, wind gusts to 50 mph are possible which, with the recent heavy rain, could knock down a few branches or trees.
9:02pm Update: The line of thunderstorms now moving through McHenry and Walworth counties, and exiting DeKalb counties. Winds still being reported at 70mph, with one report of penny-sized hail in DeKalb. Heavy rainfall behind the leading edge.
8:20pm Update: Tornado Warning issued for Boone, De Kalb, Ogle, and Winnebago counties until 8:45pm. Multiple reports of wind damage with trees and power lines downed. Radar indicated 70 mph in this line of storms.
7:30pm Update: Severe Thunderstorm Warning issued for Winnebago and Ogle counties until 8:15pm. Damaging winds are expected with this line as 70 mph wind gusts are possible, with reports of 66 mph wind gusts already. Storms are moving southeast at around 65mph
6:50pm Update: Severe Thunderstorm Warning for Stephenson, Carroll and Jo Daviess counties until 8pm. Line of thunderstorms moving into northwest Illinois has had a history of producing wind damage. As storm moves in, remain indoors and away from winds. Wind gusts to 70 mph are possible. Storm is currently located over Platteville, Wi and moving southeast at 60 mph.
5:45pm Update: New Severe Thunderstorm Watch issued for southern Wisconsin and northern Illinois until Midnight.
A cluster of thunderstorms has maintained its strengthen moving out of the northern Plains and into the Midwest Tuesday afternoon. Most of the early evening over southern Wisconsin and northern Illinois will remain dry, just very humid. Thunderstorms are expected to move into southwest Wisconsin and northern Illinois between 8pm and 10pm and then through north-central and northeast Illinois between 9pm and midnight. Damaging winds will be the biggest threat, followed by heavy rainfall, hail and even a low end tornado risk.