National Weather Service United States Department of Commerce

Mississippi Valley Summer Heat Wave; Severe Thunderstorms and Flooding Possible to the North

A dangerous summer heat wave will continue much of the Plains, Mid/Lower Mississippi Valley, Southeast U.S. today and Thursday. Areas of severe thunderstorms may occur today and again on Thursday from parts of the northern/central Rockies and High Plains into the Ohio Valley and Carolinas. Excessive rainfall over similar areas may bring flash flooding today and Thursday. Read More >


Fast Facts:

  • The remnants of Subtropical Storm Alberto were the primary impetus to heavy showers and embedded storms on Wednesday, May 30.
  • Atmospheric moisture was high, near or at record levels for late May, setting the stage for periods of heavy rain and isolated totals of 2-5", especially over DuPage and northwestern Cook County.
  • Some of the showers were extremely slow moving in the late afternoon and early evening, overlapping the evening commute time.
  • The heaviest hit communities with rainfall and some flooding impacts were Addison, Barrington, Hoffman Estates, Elmhurst, and Villa Park.
  • The 0.90" of rain at Chicago O'Hare pushed their total to 8.21" for the month, setting a record for the wettest May.
Radar Loop
24-hour Radar Loop on Wednesday, May 30
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Additional recaps can be found on the NWS Chicago Past Events Page
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