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Mesoscale Discussion 328
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   MESOSCALE DISCUSSION 0328
   NWS STORM PREDICTION CENTER NORMAN OK
   0908 PM CDT SAT APR 12 2014

   AREAS AFFECTED...IA...SRN WI...NRN IL

   CONCERNING...SEVERE THUNDERSTORM WATCH 70...

   VALID 130208Z - 130315Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 70
   CONTINUES.

   SUMMARY...SEVERE THUNDERSTORM WATCH WILL BE REISSUED TO INCLUDE MOST
   OF WW70 AND ADDITIONAL COUNTIES ACROSS NORTHERN IL.

   DISCUSSION...NUMEROUS THUNDERSTORMS PERSIST ALONG A CORRIDOR FROM
   SWRN IA...NEWD ACROSS SRN WI INTO CNTRL LOWER MI.  SCATTERED
   EMBEDDED SUPERCELLS HAVE EVOLVED WITHIN A FOCUSED WARM-ADVECTION
   ZONE CHARACTERIZED BY STEEP LAPSE RATES AND SUFFICIENT MOISTURE FOR
   ROBUST UPDRAFTS/DOWNDRAFTS.  00Z SOUNDING FROM DVN APPEARS TO HAVE
   SAMPLED NERN PLUME OF STEEPER LAPSE-RATE ENVIRONMENT AND DEPICTS A
   FAIRLY DRY SUBCLOUD LAYER THAT WOULD SEEM SUPPORTIVE OF ENHANCED
   DOWNDRAFTS.  IF A COLD POOL CAN EVOLVE WITH CNTRL IA CONVECTION THEN
   DAMAGING WIND THREAT MAY INCREASE.  OTHERWISE...LATEST WDSSII DATA
   SUGGESTS NUMEROUS SEVERE HAIL CORES WITH STRONGEST UPDRAFTS.  WITH
   TIME THIS ACTIVITY MAY SAG INTO NRN IL AND NEW WW WILL EXTEND INTO
   THIS REGION TO ACCOUNT FOR INCREASING SEVERE THREAT TOWARD MIDNIGHT.

   ..DARROW.. 04/13/2014


   ATTN...WFO...GRB...LOT...MKX...DVN...ARX...DMX...FSD...OAX...

   LAT...LON   42519557 44118765 42288777 40779557 42519557 

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Page last modified: April 13, 2014
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