Dangerous driving conditions – heavy snow forecast to our south Friday and Saturday into Sunday

Update 5:30PM CST…

Note on the headlined map that the Winter Storm Watches/Warnings/Advisories have been widely expanded to our southmuch of southern Illinois and east Missouri under a Winter Storm Warning (pink shading) for heavy snows of 5 to 8-inches Friday afternoon to Midnight Saturday night. A Winter Storm Watch (blue shading) for heavy snow Saturday into Sunday morning extends east out of southern Illinois through southern Indiana into SW Ohio. Winter Weather Advisories (purple shading) for 4 to 6-inches of snow are up to our west in Iowa and Missouri.

As low pressure moves east out of the Texas Panhandle Friday, cloudiness and precipitation will spread quickly east and north. Accumulating snow will likely reach as far north as Interstate-80 from Iowa through Illinois into Indiana Friday and Saturday into Sunday. Here in the Chicago area 3 to 5-inches of snow may occur south of Interstate-80 with lesser amounts to the north later Friday into Saturday.

Forecast weather map for Saturday morning..dark blue shading is heavier snow…

Forecast of Fronts/Pressure and Weather valid Sat 12Z

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For those anticipating travel south this weekend pay close attention to a developing heavy snow situation that looks to involve primarily southern and central portions of Illinois and Indiana Friday night and Saturday. A Winter Storm Watch (blue-shaded area on the headlined map)  has been issued for the southern half of Illinois and eastern Missouri calling for 4 to 8-inches of snow beginning Friday evening with heaviest snowfall later Friday night into Saturday morning. A similar Watch may be issued for the southern half of Indiana before too long.  Snow should be diminishing from the west in Illinois Saturday night and Indiana Sunday.

The Chicago area will be situated on the northern periphery of the developing storm system with several inches of snow possible south of Interstate-80, tailing off the farther north you go to perhaps just a trace along the Illinois-Wisconsin state line.  Because very dry air is situated over our area, it will take some time for the snow to gradually saturate the air enough to reach the ground – delaying arrival of the snow here.

The center of low pressure will move east out of the Texas Panhandle Friday, tracking over the Tennessee Valley Saturday-Saturday night, associated precipitation ending from the west, as the storm system moves east.

 

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