Thursday, September 9, 2010

Just a little on the cool side

A ridge of high pressure stretches from a center on the southwestern shore of Hudson Bay  southeast across western Ontario, western Lake Superior, Wisconsin, Illinois, into Kentucky.  The ridge provided the area with mostly clear skies and chilly temperatures overnight.  Warmer air over the plains is riding up over the ridge.  That has resulted in some light rains over southern Minnesota.  There are also radar echoes over northern Iowa into extreme western Wisconsin where the rain is not reaching the ground.  It appears as if there will be lots of clouds today and limited sunshine, and temperatures will top out in the low 70's... just a few degrees below average.  The ridge will shift slowly to the east tonight and tomorrow, but will continue to control Stateline weather through Friday.  On Friday night tropical moisture from the remnants of Hermine will spread northward across Illinois setting off showers and thunderstorms that will persist into Saturday until a cold front shoves the activity off to the east.  High pressure over the southern plains will take charge of midwest weather on Sunday with sunny skies an pleasant temperatures into the middle 70's.  By late Sunday night another cold front will sweep across northern Illinois, and there may be some showers and thunderstorms associated with that front through Monday morning.  Canadian high pressure will follow in behind that front bringing cooler temperatures and mostly clear skies.

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