Monday, July 22, 2013

Monday weather update: Another warm afternoon, but changes on the way

Skies will remain partly cloudy this afternoon as the temperature rises and the humidity begins to creep up as well.  A fairly strong cold front (for the middle of July) currently extends from Duluth, MN through St. Cloud, MN to Sioux City, IA and to just north of Lincoln, NE.  This front will move closer to southern Wisconsin and northern Illinois during the afternoon and evening.  Surface heating will continue to take place ahead of the front allowing temperatures to rise into the middle and upper 80s and dew points to rise into the middle 60s.  It appears as if the greatest threat for storms will remain closely tied to the cold front from a line extending along and west of Wausau, WI - Dubuque, IA, and Kirksville, MO.  The front is expected to move through after sunset tonight and by that time the atmosphere will have lost some of the energy that had been built up during the afternoon.  Also, the greatest lift within the atmosphere will remain further north in Wisconsin.  Either way, scattered thunderstorms will remain likely through the late evening and overnight - with only a few isolated storms possible ahead of the front during the peak heating of the day...between 2pm and 4pm.  It's possible if storms fire up during the late afternoon some could contain gusty winds and hail.

Our WeatheRisk for today will remain at a yellow, or moderate, due to the threat for storms later this afternoon and evening.  Once the front passes high pressure will move in for the rest of the week keeping the majority of storms to the south and west until the weekend. 

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