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Mesoscale Discussion 590
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   MESOSCALE DISCUSSION 0590
   NWS STORM PREDICTION CENTER NORMAN OK
   0656 PM CDT MON MAY 12 2014

   AREAS AFFECTED...WI...NRN IL

   CONCERNING...SEVERE THUNDERSTORM WATCH 152...

   VALID 122356Z - 130100Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 152
   CONTINUES.

   SUMMARY...SCATTERED THUNDERSTORMS WILL CONTINUE ACROSS WW152 FOR
   SEVERAL HOURS.  FRONTAL SQUALL LINE SHOULD ADVANCE SLOWLY ACROSS IL
   AT ROUGHLY 15-20KT.  WW WILL BE LOCALLY EXTENDED TO INCLUDE CHICAGO
   METRO.

   DISCUSSION...PRE-FRONTAL WARM ADVECTION CONTINUES TO AID DISCRETE
   THUNDERSTORM ACTIVITY ACROSS SRN WI AND NRN IL.  STEEP LAPSE RATES
   IN THE LOWEST 3KM EXTEND ACROSS IL TO NEAR THE WI BORDER AND NEW
   TSTMS ARE DEVELOPING WITHIN THIS BUOYANT AIRMASS ALONG SRN FRINGE OF
   WW.  LARGE HAIL REMAINS THE MOST LIKELY SEVERE THREAT WITH THIS
   PRE-FRONTAL CONVECTION AS IT SPREADS/DEVELOPS NEWD TOWARD SRN LAKE
   MI.

   WITH TIME...N-S FRONTAL SQUALL LINE WILL SPREAD SLOWLY ACROSS WRN IL
   INTO WW152 LATER THIS EVENING.

   ..DARROW.. 05/12/2014


   ATTN...WFO...LOT...MKX...DVN...ARX...

   LAT...LON   43579065 43558776 42098777 42139067 43579065 

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Page last modified: May 13, 2014
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