A developing storm system will pull down a very cold air mass across the western U.S. while warmer than normal air lifts north across the Midwest and Great Lakes. Blizzard Warnings, Winter Weather Advisories and Winter Storm Warnings are posted for Montana, North Dakota, South Dakota, Minnesota and just east of the Rockies in anticipation of the low as it moves into the Plains.
Gusty south winds Saturday will allow temperatures to rise into the 70s across parts of Illinois, Iowa and Missouri. Cloud cover should begin to break up Saturday afternoon after a few morning showers across northern Illinois and southern Wisconsin allowing temperatures to rise into the mid and upper 60s. Highs will once again rise into the low 60s Sunday ahead of a strong cold front that will swing through by Sunday evening. Temperatures behind the front will drop 30 degrees by Sunday night with afternoon highs only reaching the upper 30s both Monday and Tuesday.
Rainfall totals may end up on the hefty side along and just behind the front by Sunday night. With southerly winds moisture from the Gulf of Mexico will stream north through Illinois and Wisconsin this weekend. With such a strong and dynamic storm system moving through it's possible near an inch of rain may fall through the weekend. However, once the cold air arrives behind the front we'll likely develop a rain/snow mix late Sunday before light snow falls by Monday afternoon.
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