National Weather Service United States Department of Commerce

After our rain departs Monday night, heat and humidity arrive for Tuesday and Wednesday. Heat indices on Tuesday rise into the 90s and 95-105 degrees for Wednesday. The risk for showers and storms does lower confidence in the exact heat index values on Wednesday, but it should be humid regardless of the coverage of storms. If you have outdoor plans, be sure to plan appropriately and stay well-hydrated.
We continue to monitor the risk for severe storms Wednesday afternoon across the Upper Mississippi River valley region. At this time, storms are looking to develop near I-35 and quickly become severe as they move eastward. Large hail is favored early on with the storms, transitioning to damaging winds as the storms move east of the Mississippi River. Details on the exact storm timing, locations most at risk, and hazard severity will be refined over the next day or so. Additional strong to severe storms are possible early Wednesday morning with large hail being the main threat.