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Mesoscale Discussion 455
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   MESOSCALE DISCUSSION 0455
   NWS STORM PREDICTION CENTER NORMAN OK
   0209 PM CDT MON APR 28 2014

   AREAS AFFECTED...CNTRL AND NE MS...NW AL

   CONCERNING...SEVERE THUNDERSTORM WATCH 108...

   VALID 281909Z - 282015Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 108
   CONTINUES.

   SUMMARY...TORNADO THREAT IS EXPECTED TO CONTINUE TO INCREASE LATE
   THIS AFTERNOON AS NUMEROUS TORNADIC SUPERCELLS DEVELOP ACROSS PDS
   TORNADO WATCH 108. THE AREA FROM CNTRL MS EXTENDING NEWD INTO NW AL
   WILL BE UPGRADED TO HIGH RISK AT THE 20Z OUTLOOK.

   DISCUSSION...SUPERCELL THUNDERSTORMS ARE CONTINUING TO DEVELOP
   ACROSS CNTRL AND NRN MS THIS AFTERNOON IN RESPONSE TO STRONG UPLIFT
   AND DESTABILIZATION. THE ENVIRONMENT IS CHARACTERIZED BY MODERATE
   INSTABILITY...STRONG DEEP LAYER SHEAR AND SUBSTANTIAL LOW-LEVEL
   SHEAR. THE WSR-88D VWPS IN CNTRL AND NRN MS SHOW LOOPED HODOGRAPHS
   WITH 0-3 KM STORM RELATIVE HELICITIES IN THE 450 TO 500 M2/S2 RANGE.
   THIS SHOULD SUPPORT A THREAT FOR STRONG TORNADOES AS SUPERCELLS
   CONTINUE TO INTENSIFY. DUE TO THIS IMPRESSIVE SHEAR ENVIRONMENT...AN
   OUTBREAK OF TORNADOES APPEARS LIKELY AND THE AREA FROM CNTRL MS
   EXTENDING NEWD INTO NW AL WILL BE UPGRADED TO HIGH RISK FOR THE 20Z
   OUTLOOK.

   ..BROYLES/THOMPSON.. 04/28/2014


   ATTN...WFO...OHX...BMX...HUN...MEG...JAN...

   LAT...LON   32498898 32189019 32299092 32639126 33279101 34348959
               35408791 35408675 34758591 33978628 32918781 32498898 

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Page last modified: April 28, 2014
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