Unusually Cool

A large closed low with an impressive circulation is located over northern Lake Michigan, and is moving slowly eastward.  A vort max is dropping southeast from southeastern Minnesota toward southern Wisconsin this afternoon.  This system will be effective in keeping continuous cloud cover across the Stateline this afternoon.  There will be sprinkles and light rain showers from time to time that will be enhanced this afternoon as the vort max drops into southern Wisconsin.  Still, precipitation amounts should be minor, not amounting to more than a few hundredths of an inch in most cases, and even where heavier precipitation develops not more than 0.20" should occur.  The cloud cover will keep the temperatures in the 60's all day.  Tonight scattered showers will come to an end as the vorticity center shifts off to the east and drier air associated with weak high pressure over the plains begins to move into the mid west.  Friday should remain a mostly cloudy day, but with some peaks of sunshine, and clouds breaking up a little more by late in the day, the high temperatures will reach the low 70's.    High pressure from the plains will move into the Stateline on Saturday bringing warmer temperatures into the upper 70's under mostly sunny skies.  A warm front will develop eastward from low pressure over western Kansas by early Sunday and stretch from near Kansas City to the southern tip of Illinois.  Clouds will increase on Sunday as warm moist air from the Gulf of Mexico rides up and over the front building some scattered showers and thunderstorms into northern Illinois.  The warm front will move northward across the Stateline early on Monday bringing 80 degree plus temperatures back into the region, and continuing chances of showers and thunderstorms.   A cool front is expected to sweep across the area on Monday night with attending thunderstorms.  It will be partly cloudy on Tuesday, and mostly sunny on Wednesday with temperatures continuing to top out in the low to middle 80's.