The cold front that provided us with the rain Friday has now pushed off to the east and is located right along the Appalachain Mountains. There are two Low Pressure Centers associated with the cold front. One can be seen in the southeastearn U.S. and the other is located North of the Great Lakes with a pressure value of 992mb. Since we are on the backside of the Low Pressure system our winds have shifted. This has allowed our temperatures to drop back in the teens and twenties today instead of the upper forties to low fifties, which we had for highs yesterday across Northern Illinois.
Current infrared satellite picture shows the thicker cloud cover associated with cold front now off to the east along Eastern Ohio, Western Pennsylvania, and into the Southeast. Northern Illinois is under partly to mostly cloudy skies behind the system. Some areas may see a few flurries tonight on the backside of the Low.
Current surface temperatures for Nothern Illinois are in the upper teens and low twenties. This map depicts the cooler temperatures moving into Northern Illinois from the Northwest quite nicely. Winds have gusted up to 30 mph in DeKalb at times this afternoon. Winds should slow during the overnight as the Low continues to push off to the east, northeast.
The GFS (shown on left) and NAM models (shown on right) appear to be in fair agreement for what is to come over the next few days. Although the NAM is moving the systems a bit slower when compared to the GFS. High pressure will dominate our weather for Sunday and Monday so conditions will be dry with partly cloudy skies both days. Temperatures will remain below freezing as the freezing line (the solid yellow line depicted in the models) stays well off to our south. A weak area of low pressure will develop over the great lakes providing a slight chance of light snow showers or flurries late Monday night (shown below on the left by the GFS) into early Tuesday morning (shown below on the right by GFS). At this point little or no accumulation is expected.
SHORT TERM FORECAST FOR DEKALB AND NORTHERN ILLINOIS
TONIGHT: A small chance of some flurries otherwise dry with mostly to party cloudy skies. Low: 10 Winds: WSW 10-15 mph
SUNDAY: Clouds break up during the late morning then becoming mostly clear. High: 24 Winds: WSW 5-10 mph
SUNDAY NIGHT: Partly cloudy. Low: 17 Winds: WSW 5-10 mph
MONDAY: Increasing clouds with the low pressure moving over the great lakes. Chance of light snow Monday evening into early Tuesday. High: 30 Winds: WSW 5-10 mph
TUESDAY: Any snow that is occuring during the overnight ends during the morning hours of Tuesday. There will be some clearing in the afternoon to partly cloudy skies. High: 23 Low: 10
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