Mesoscale Convective System moves across southern Wisconsin
Posted by JAC on 6/19/2009, 1:44 pm


A cluster of thunderstorms developed over extreme northeastern Iowa and extreme southeastern Minnesota, and merged into a large MCS - Mesoscale Convective System  across southern Wisconsin during the early hours on 19 June 2009. AWIPS images of the 4-km resolution GOES-12 IR channel displayed the rapid growth of this MCS, which was responsible for a number of reports of hail and damaging winds.

Below is shown a 1-km resolution MODIS 11.0 IR image with an overlay of cloud-to-ground lightning strikes.  This shows the tendency for lightning strikes to cluster around the many enhanced-v and cold/warm couplet signatures on the IR image.



There was a report of baseball-size hail 2.75 inch diameter just to the northwest of Madison, Wisconsin, station identifier KMSN, which was near the coldest -80C MODIS IR cloud top pixel shown below:



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Friday Afternoon Severe Weather for IA, IL, IN - JAC, 6/19/2009, 8:29 am
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