000
ACUS11 KWNS 242251
SWOMCD
SPC MCD 242250
TNZ000-KYZ000-ALZ000-MSZ000-ILZ000-MOZ000-ARZ000-LAZ000-TXZ000-OKZ000-250015-

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

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

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