National Weather Service United States Department of Commerce

Cold Front Dropping South Across the Western U.S.; Watching Threat for Tornadoes and Flooding in the South

A cold front will push south across the Western U.S. into Tuesday with mountain snow and areas of gusty to high winds. An area of low pressure will form along this front on Tuesday and bring a potential for severe thunderstorms with tornadoes and excessive rainfall in the lower to mid Mississippi River Valley. To the north, heavy snow is possible in parts of the upper Midwest. Read More >

Multiple weather systems passed across northern Illinois from Oct 29-31. The rapid succession of these resulted in cold enough air to keep precipitation type mainly as snow for the final system especially on Halloween day. The snow amounts were the most snow on Halloween day on record for long term climate sites in northern Illinois (Chicago and Rockford). Amounts were even in excess of 5" in parts of far northern Illinois. Snow had been mentioned in the forecast as early as six days in advance, and then the message of accumulating snow refined during the week of.  
Snow Photo
Photo courtesy of Andrew Blackford in Valparaiso, IN



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