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Mesoscale Discussion 646
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   MESOSCALE DISCUSSION 0646
   NWS STORM PREDICTION CENTER NORMAN OK
   0920 PM CDT WED APR 27 2011
   
   AREAS AFFECTED...AL AND FAR SERN MS
   
   CONCERNING...TORNADO WATCH 235...
   
   VALID 280220Z - 280245Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 235 CONTINUES.
   
   A NEW TORNADO WATCH WILL BE COORDINATED SOON FOR ERN...CENTRAL AND
   SRN AL...AND FAR SERN MS GIVEN A TORNADO THREAT EXPECTED TO PERSIST
   THROUGH THE REST OF THE EVENING AND EARLY OVERNIGHT PERIOD.  
   
   MID EVENING REGIONAL RADAR IMAGERY SHOWED STRONG TO SEVERE STORMS
   OVER SERN TO ERN AL WITH THIS ACTIVITY LOCATED ALONG A PRE-FRONTAL
   CONFLUENCE ZONE.  ADDITIONAL DISCRETE STORMS CONTINUE TO DEVELOP
   ALONG THE COLD FRONT MOVING INTO CENTRAL AL TO SERN MS.  WARM SECTOR
   AIR MASS WILL REMAIN MODERATELY UNSTABLE WITH EFFECTIVE BULK SHEAR
   IN EXCESS OF 50 KT MAINTAINING LIKELIHOOD FOR DISCRETE SUPERCELLS. 
   WSR-88D VADS OVER SERN AL INDICATED STRENGTHENING LOW LEVEL JET /50+
   KT/ WHICH IS SUPPORTING ENHANCED LOW LEVEL SHEAR  /0-1 KM SRH 475 M2
   PER S2/.  GIVEN THE INSTABILITY/SHEAR VALUES...A CONTINUED TORNADO
   THREAT IS EXPECTED AS STORMS DEVELOP ALONG AND AHEAD OF THE COLD
   FRONT ADVANCING EWD.
   
   ..PETERS.. 04/28/2011
   
   
   ATTN...WFO...MRX...BMX...HUN...MOB...JAN...LIX...
   
   LAT...LON   30978939 32748813 35008569 33518540 32138641 31448619
               31048642 30828821 30888918 30978939 
   
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Page last modified: April 28, 2011
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