UPDATE, 4:45 p.m. ET (3:45 p.m. CT): The National Weather Service Storm Prediction Center (SPC) has issued a “Particularly Dangerous Situation Severe Thunderstorm Watch” for southeast Wisconsin, northeast Illinois, northwest Indiana and southwest Michigan until 9 p.m. central. This includes Chicago and Milwaukee.
Widespread damaging winds to 80 mph, large hail, and one or two tornadoes are possible in this area. SPC says the thunderstorm system is producing a derecho in eastern Iowa which is expected to sweep through this region around between roughly 6 and 9 p.m. central. Significant numbers of downed trees and power outages are likely to occur.
Area under particularly dangerous situation watch outlined in blue. Radar view shown captured at 3:35 p.m. CT
Original, post from 3:10 p.m. ET (2:10 p.m. CT): A complex of thunderstorms erupting over Iowa this afternoon may consolidate into a powerful squall line or derecho that rips through the Upper Midwest this evening.
Storm over Iowa as of 1:45 p.m. ET (NASA)
The National Weather Service’s Storm Prediction Center (SPC) forecasts has highlighted a broad region as having a 45 percent chance of experiencing destructive winds (within 25 miles of any point) over 70 mph. Des Moines, Madison, Milwaukee and Chicago all lie within this zone of elevated risk, which affects almost 19 million people.
Risk of damaging winds. Hatched area indicates elevated likelihood of destructive winds over 70 mph. (NWS SPC)
“Numerous severe thunderstorms capable of large hail, tornadoes and swaths of damaging wind are expected today into tonight over much of the Corn Belt and Midwest,” SPC says.
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