PDS coming up for most AL and mid TN
Posted by JAC on 4/27/2011, 2:21 pm



MESOSCALE DISCUSSION 0626
  NWS STORM PREDICTION CENTER NORMAN OK
  0105 PM CDT WED APR 27 2011
 
  AREAS AFFECTED...MUCH OF AL INTO MIDDLE TN/NORTHWEST GA
 
  CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY
 
  VALID 271805Z - 271930Z
 
  A LONG DURATION PARTICULARLY DANGEROUS /PDS/ TORNADO WATCH WILL BE
  ISSUED BY MID AFTERNOON FOR MUCH OF AL INTO MIDDLE TN/NORTHWEST
  GA...WITH AN ISSUANCE PROBABLE BY AROUND 19Z.
 
  AMID CLOUD BREAKS...THE AIRMASS CONTINUES TO QUICKLY DESTABILIZE IN
  THE WAKE OF A DECAYING MORNING WEST-EAST BOUNDARY ACROSS AL...AND TO
  THE SOUTH OF A MORE RECENT MCS-INDUCED BOUNDARY/COLD POOL ACROSS FAR
  NORTHERN AL. WITH A CLASSIC/SYNOPTICALLY EVIDENT OUTBREAK SETUP VIA
  A SHORTWAVE TROUGH/STRONG JET STREAK CURRENTLY NEARING THE
  LOWER-MIDDLE MS RIVER VALLEY PER SATELLITE IMAGERY...AN INCREASINGLY
  VOLATILE SETUP IS LIKELY THROUGH THE AFTERNOON. SUPERCELLS CAPABLE
  OF STRONG/VIOLENT TORNADOES ARE EXPECTED TO BECOME PREVALENT ACROSS
  AN INCREASINGLY UNSTABLE/WEAKLY CAPPED WARM SECTOR...WITH WSR-88D
  VWP OBSERVED AND RUC FORECASTS REFLECTING INCREASINGLY LONG/LOOPING
  LOW LEVEL HODOGRAPHS. IN THE WAKE OF A MORNING SEVERE MCS...THE
  AIRMASS IS EXPECTED TO RAPIDLY RECOVER ACROSS FAR NORTHERN AL INTO
  MIDDLE TN BY LATE AFTERNOON/EARLY EVENING.
 
  ..GUYER.. 04/27/2011
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High Risk today N AL, SE TN, N GA - JAC, 4/27/2011, 5:46 am
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