National Weather Service United States Department of Commerce

Widespread Excessive Heat and Humidity in Midwest to Spread to East Coast

High pressure building across the Central and Eastern U.S. will produce a dangerous combination of heat and humidity. Heat indices from unusually high dewpoints and well above normal temperatures may reach 110 to 115 degrees. In addition, near record warm low temperatures will limit recovery from hot daytime temperatures. Read More >

[11:15 am 7/18/2019 update] A complex of thunderstorms resides to our northwest. A boundary around it is forcing storms to move southeast out of IL, but are currently dying as they do so. The boundary moving towards the northeast in IN will continue to provide the area with frequent lightning, heavy rain and gusty winds .
An excessive heat warning is in effect for the entire forecast area today into Saturday. Heat indices will climb as high as 110 for many locations. Heat illnesses are likely for those spending prolonged periods outside or in non-air conditioned environments. Vehicle interiors can reach lethal temperatures in just minutes. Please take appropriate precautions! Otherwise, showers and thunderstorms are possible today. A few of those could be strong to severe, but confidence is low at this time. A moderate swim risk is expected on Friday for Lake Michigan beaches. Breaking waves and currents are expected, so be sure to swim at a guarded beach and heed the advice of any lifeguards or beach patrol.
Heat related deaths are preventable. Protect yourself and others from the impacts of heat waves. Heat over several days can have a cumulative affect and this is especially dangerous for elderly, sick and those without air conditioning.