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Mesoscale Discussion 576
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   MESOSCALE DISCUSSION 0576
   NWS STORM PREDICTION CENTER NORMAN OK
   1101 PM CDT SUN MAY 11 2014

   AREAS AFFECTED...IA

   CONCERNING...TORNADO WATCH 145...

   VALID 120401Z - 120500Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 145 CONTINUES.

   SUMMARY...SEVERE THUNDERSTORMS WILL PROGRESS ACROSS THE REMAINDER OF
   WW145 BY 06Z.

   DISCUSSION...MCS HAS EVOLVED OVER IA THIS EVENING AS MULTIPLE
   SUPERCELLS MERGED UPSTREAM OVER ERN NEB WITHIN WARM ADVECTION ZONE. 
   RAIN-INDUCED COLD POOL HAS GRADUALLY EXPANDED WITH THIS COMPLEX OF
   STORMS AND A N-S LINE OF ENHANCED CONVECTION IS SURGING EWD AT
   ROUGHLY 40KT ACROSS CNTRL IA.  WHILE EMBEDDED SUPERCELLS ARE NOTED
   ALONG THIS LINE IT APPEARS THE GREATEST RISK IS TRENDING TOWARD
   DAMAGING WINDS AND LARGE HAIL.  GIVEN THE CURRENT SPEED OF THIS MCS
   THE LEADING SQUALL LINE SHOULD ADVANCE TO THE ERN EDGE OF THE WATCH
   BETWEEN 05-06Z.

   ..DARROW.. 05/12/2014


   ATTN...WFO...DVN...ARX...DMX...FSD...OAX...

   LAT...LON   40599517 42909518 42909221 40609230 40599517 

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