After a windy and downright hot day, storms should begin to develop late tonight across Iowa. A cold front will hover over the state, acting as the focal point for thunderstorms. At this time these nocturnal storms pose little if any severe threat (an isolated hail producer cannot be ruled out), but they could lead to some heavy rainfall over local areas.
Tonight’s greatest threat for severe weather should stay to our north and east in Wisconsin, where severe weather is expected.
Despite the cold front, the atmosphere over Iowa has stayed capped all day long, preventing thunderstorms from firing. That cap should weaken considerably after sunset, allowing showers and thunderstorms to develop.
Again, at this time we do not expect any organized severe weather threat. But we will monitor the situation tonight should that change. Saturday things will eventually dry out for most areas and storms should hold off until late at night (especially in southern Iowa). This active pattern looks like it could stretch into next week. More on that coming up later this weekend.