Re: Looks like it'll be a Derecho Threat
Posted by JAC on 5/23/2011, 4:41 pm


MESOSCALE DISCUSSION 0897
  NWS STORM PREDICTION CENTER NORMAN OK
  0252 PM CDT MON MAY 23 2011
 
  AREAS AFFECTED...SRN IL/IND...NRN KY...SWRN OH
 
  CONCERNING...SEVERE THUNDERSTORM WATCH 340...341...
 
  VALID 231952Z - 232045Z
 
  THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
  340...341...CONTINUES.
 
  NEW WW WILL BE ISSUED BY 21Z DOWNSTREAM OF WW 340/341.
 
  QLCS ACROSS SRN IL APPEARS TO HAVE RECENTLY ACCELERATED AS TSTM
  CORES HAVE BECOME ABSORBED ALONG THE SRN FLANK OF CONVECTIVE
  OUTFLOW. AS TEMPERATURES AHEAD OF THIS LINE HAVE NOW WARMED INTO THE
  MIDDLE TO UPPER 80S...MODIFIED 18Z ILX RAOB SUGGESTS A VERY UNSTABLE
  AIR MASS IS PREVALENT ALONG AND JUST N OF THE LOWER OH VALLEY WITH
  MLCAPE OF 2500 TO 4000 J/KG. WITH A MODERATELY STRONG NEARLY
  UNIDIRECTIONAL W/SWLY LOW/MID-LEVEL WIND PROFILE...EWD FORWARD
  PROPAGATION OF THE MCS SHOULD PERSIST. A SWATH OF DAMAGING WIND AND
  EMBEDDED MARGINALLY SEVERE HAIL APPEARS HIGHLY PROBABLE ACROSS SRN
  IND AND PERHAPS PARTS OF NRN KY/SWRN OH.
 
  ..GRAMS.. 05/23/2011
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Indy, Detroit, Toledo, Cleveland, Dayton, Columbus Under-the-Gun - JAC, 5/23/2011, 8:37 am
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