Surface low pressure is over Nebraska this evening, and a warm front stretches eastward from that low across Iowa and Illinois just south of Interstate 80. Northern Illinois has had several rounds of rainfall today. The first one this morning was associated with a upper disturbance riding across the area. Another disturbance is moving from Iowa into nothern Illinois tonight in association with a strong low level jet pumping in Gulf moisture from the south riding up and over the warm front to our south generating numerous showers and some thunderstorms overnight. It will continue to be very mild the warm front lifting to the north into Wisconsin so that overnight lows will be about 20 degrees above average. The Stateline will be in the warm sector from Sunday through Monday night. It will be in the upper 60's on Sunday, and into the middle 70's on Monday. Scattered showers and thunderstorms will continue on Sunday, and some showers will persist into Monday morning before skies become partly cloudy later in the morning through the afternoon. A very intense low pressure system is expected to develop over the Iowa/Minnesota area on Monday night, bringing another round of showers and thunderstorms to the area into Tuesday morning in advance of a strong cold front. Because of the intensity of the low, winds are expected to be very strong over all of the upper midwest. There will be gale warnings across the Great Lakes on Tuesday which will likely be elevated to Storm Warnings by Wednesday. High wind advisories will likely be issued by the National Weather Service for the Stateline on Tuesday with winds up to 45 mph, and it is possible the parts of the area may see high wind warnings issued. This is expected to be an extremely strong storm system. It will push a cold front through the Stateline early Tuesday morning. High temperatures will be cooler on Tuesday, but not drastically so... in the low 60's. Progressively colder air will wrap around the intense low over Lake Superior on Wednesday restricting our high's to the low to middle 50's, and by Thursday temperatures will not rise out of the upper 40's.
By Meteorologist
Eric Nefstead
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