The Storm Prediction Center has posted a Tornado Watch just west and north of Iowa. Again I want to make clear that this tornado watch does not include any Iowa counties. But this is the beginning of a stormy afternoon and evening across the Upper Mississippi Valley.
Showers and thunderstorms are expected to rapidly develop along a frontal boundary in the area currently under a tornado watch. Eventually (especially after sunset), strong to severe thunderstorms should form one or more bowing section as the storms approach the westernmost counties in Iowa.
This could lead to a severe thunderstorm threat here in Iowa, with the primary threat being strong damaging winds and some large hail. It’s expected that by the time the storms reach Iowa the tornado threat should subside. But an isolated spin-up or two cannot be ruled out.
Storms should spend the evening and overnight hours traveling across the state. These storms will also bring the threat of heavy rainfall, which could pose a problem in areas already hit hard by heavy rains earlier this weekend.
We’ll continue to monitor this threat and bring you more updates as storms approach Iowa. If conditions warrant, we’ll launch our live chat coverage later tonight if the storms threaten.