Severe thunderstorm and heavy rainfall threats will persist from the Midwest to Lower Great Lakes through Monday, shifting into the Ohio Valley and Central Appalachians Monday evening into Tuesday. Mid-summer heat will continue across much of the CONUS this week, with record highs possible well into the 100s across the south-central High Plains. Read More >
 The Chicago/Romeoville National Weather Service Forecast Office issues generalized weather forecasts out to 7 days for north central and northeast Illinois and far northwest Indiana. Other offices (including Quad Cities, Lincoln, St. Louis and Paducah) issue forecasts for the remainder of Illinois and Indiana. These forecasts are the product of a mix of scientific models and forecaster experience. The models run twice a day and so routine forecasts are issued in the early morning and mid afternoon (4 am and 4 pm). Updated forecasts are issued as conditions warrant. Latest Forecasts for Northern Illinois and Northwest Indiana:
Winter Weather Page: A page for all winter forecasts for northern Illinois and northwest Indiana, along with definitions, climate information and much more. Forecasts Maps: from the Hydrometeorological Center
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