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Mesoscale Discussion 397
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   MESOSCALE DISCUSSION 0397
   NWS STORM PREDICTION CENTER NORMAN OK
   0550 PM CDT THU APR 24 2014

   AREAS AFFECTED...AR...FAR SERN OK...NRN LA...NRN MS...WRN AND MIDDLE
   TN...SERN MO...AND WRN KY

   CONCERNING...SEVERE THUNDERSTORM WATCH 90...

   VALID 242250Z - 250015Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 90
   CONTINUES.

   SUMMARY...A BROKEN LINE OF STRONG TO SEVERE STORMS MOVING THROUGH
   WRN INTO CENTRAL AR WILL CONTINUE TO POSE A THREAT FOR HAIL AND
   DAMAGING WINDS AS THIS ACTIVITY ADVANCES EWD INTO THE EARLY EVENING.
   FARTHER EAST...STORMS MOVING INTO NRN MS AND WRN TN SHOULD TEND TO
   PRODUCE A SPORADIC COVERAGE OF STRONGER WIND GUSTS AND HAIL.  IN THE
   SHORT-TERM...EWD EXTENSION OF THIS WATCH BY WFO/S MAY BE NEEDED INTO
   NRN MS AND WRN TN AS THE ONGOING STORMS EXIT WW 90 AROUND 00Z.

   DISCUSSION...AT 2230Z...REGIONAL RADAR IMAGERY SHOWED A BROKEN LINE
   OF STORMS IN WEST CENTRAL AR WITH THIS AREA OF STORMS MOVING ESEWD
   INTO CENTRAL AND SRN AR WHERE THE EXISTING ENVIRONMENT REMAINED
   MODERATELY UNSTABLE AND STRONGLY SHEARED.  THESE WRN AR STORMS ARE
   CO-LOCATED WITH STRONG FORCING FOR ASCENT ATTENDANT TO THE COMPACT
   EWD MOVING SHORTWAVE TROUGH WHICH WAS MOVING INTO SWRN MO/WRN AR AT
   THIS TIME.  THUS...GIVEN THE INSTABILITY/SHEAR PARAMETER SPACE
   AVAILABLE INTO CENTRAL/SRN AR...THESE STORMS ARE EXPECTED TO POSE
   THE GREATEST SEVERE WEATHER THREAT INTO THE EARLY EVENING AS THE
   SHORTWAVE TROUGH MOVES EWD.  

   FARTHER EAST...A MORE BROAD BAND OF TSTMS EXTENDED FROM SERN MO
   THROUGH ERN AR AND WAS BEGINNING TO MOVE INTO WRN TN AND NWRN MS. 
   THE AIR MASS EAST OF THIS ACTIVITY WAS SLOWLY DESTABILIZING...BUT
   THE ONGOING STORMS MAY TEND TO OUTRUN DESTABILIZATION PROCESS.  THE
   EXCEPTION WILL BE ON THE SRN END OVER SERN AR...NERN LA INTO WEST
   CENTRAL MS WHERE THE AIR MASS IS MORE UNSTABLE.  

   FARTHER NORTHEAST INTO WRN KY...TSTMS WILL BE POSSIBLE AS THE
   SHORTWAVE TROUGH PROGRESSES EWD...BUT WEAK INSTABILITY WITH NEWD
   EXTENT SHOULD TEND TO LIMIT THE DEVELOPMENT OF STRONGER TO SEVERE
   STORMS.

   ..PETERS/HART.. 04/24/2014


   ATTN...WFO...LMK...OHX...BMX...HUN...PAH...MEG...JAN...LZK...
   SGF...SHV...TSA...

   LAT...LON   34389501 34689413 35849351 36519322 36529159 36569036
               37048962 37388833 37408792 37058709 36398700 36218683
               35018702 34108783 33588832 33198956 32879065 32489146
               32259205 32249262 32299337 32849377 33439422 33459521
               34389501 

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Page last modified: April 25, 2014
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