A very warm day today may lead to isolated to scattered strong to severe thunderstorms late this afternoon and especially tonight. Large hail, damaging winds, and frequent lightning will be the primary threats. The Storm Prediction Center is forecasting a Marginal Risk, level 1 out of 5 for severe storms tonight, generally northwest of Iowa City to Dubuque Iowa.
Tomorrow, building heat and humidity will combine with near daily thunderstorm chances in the region from Thursday through the weekend. Some strong to severe storms will be possible from time to time. Locally heavy rain will also be possible out of any storm system. Thursday, the Storm Prediction Center is forecasting an Enhanced Risk for severe weather, level 3 out of 5 for areas south of Interstate 80.