Very humid air remains in place tonight keeping temperatures warm under a mostly clear sky. There is a slight chance for a shower/storm near Decorah and north overnight. Friday is hot and very humid again with the heat index in spots topping 100 degrees. We start the day with sunshine and by the afternoon and into the evening showers and storms are possible. Locally heavy rain in the main threat from the storms.
The chance of showers/storms continues into the weekend with very humid conditions. Any storms will drop locally heavy rain. The storm chances ends early Monday morning. The humidity level drops during the day with more comfortable temperatures and humidity Tuesday and Wednesday.