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Mesoscale Discussion 468
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   MESOSCALE DISCUSSION 0468
   NWS STORM PREDICTION CENTER NORMAN OK
   1053 PM CDT MON APR 28 2014

   AREAS AFFECTED...WEST-CENTRAL/NORTH-CENTRAL AL

   CONCERNING...TORNADO WATCH 113...

   VALID 290353Z - 290530Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 113 CONTINUES.

   SUMMARY...VOLATILE SCENARIO INCLUDING SUPERCELLS CAPABLE OF STRONG
   TORNADOES WILL CONTINUE AT LEAST THROUGH 05Z...PARTICULARLY ACROSS
   WEST-CENTRAL/NORTH-CENTRAL AL...INCLUDING THE BIRMINGHAM METRO AREA
   VICINITY. TORNADO WATCH 113 CONTINUES UNTIL 3 AM CDT.

   DISCUSSION...AS OF 1045 PM CDT...MULTIPLE POTENTIALLY TORNADIC
   SUPERCELLS ARE ONGOING ACROSS NORTH-CENTRAL/WEST-CENTRAL
   AL...INCLUDING ONE SE OF TUSCALOOSA AND OTHERS ALONG THE I-65
   CORRIDOR NORTH OF BIRMINGHAM. NEAR-SURFACE TEMPS HAVE BEGUN TO
   SLOWLY COOL...BUT THE BOUNDARY LAYER REMAINS ESSENTIALLY UNINHIBITED
   WITH AROUND 1500 J/KG MLCAPE COINCIDENT WITHIN A MOIST ENVIRONMENT
   WITH AROUND 67-68 F SURFACE DEWPOINTS. WITH 1-2 KM WINDS HAVING
   BACKED/STRENGTHENED OVER THE PAST FEW HOURS...THE LATEST WSR-88D VWP
   DATA FROM BIRMINGHAM IS INDICATIVE OF NEARLY 500 M2/S2 OF 0-1 KM SRH
   AND 600+ M2/S2 0-3 KM SRH VIA A PRONOUNCED SICKLE-SHAPE LOW-LEVEL
   HODOGRAPH. THESE SHEAR/SRH MAGNITUDES ARE CONSISTENT WITH STRONG
   TORNADO POTENTIAL AS SUPERCELLS ARE LIKELY TO CONTINUE TO MOVE
   NORTHEASTWARD ACROSS AL OVER THE NEXT SEVERAL HOURS.

   ..GUYER.. 04/29/2014


   ATTN...WFO...BMX...HUN...

   LAT...LON   32928758 33228770 34428648 34278594 32988648 32928758 

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Page last modified: April 29, 2014
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