Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 250144
SWOMCD
SPC MCD 250144
ALZ000-MSZ000-ARZ000-LAZ000-250245-

MESOSCALE DISCUSSION 0400
NWS STORM PREDICTION CENTER NORMAN OK
0844 PM CDT THU APR 24 2014

AREAS AFFECTED...SERN AR...NORTH CENTRAL-NERN LA...AND NRN/CENTRAL
MS

CONCERNING...SEVERE THUNDERSTORM WATCH 90...

VALID 250144Z - 250245Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 90
CONTINUES.

SUMMARY...ADDITIONAL MS COUNTIES HAVE BEEN INCLUDED IN WW 90 AS TWO
STRONG-SEVERE STORMS MOVE EWD ACROSS CENTRAL MS. TRENDS WILL BE
MONITORED EWD INTO AL FOR A NEW WW.

MEANWHILE...A THREAT FOR DAMAGING WINDS AND SOME HAIL PERSISTS WITH
A LINE OF STORMS MOVING INTO SERN AR TOWARD WEST CENTRAL MS.

DISCUSSION...AT 0130Z...MOSAIC RADAR IMAGERY SHOWED TWO
STRONG-SEVERE STORMS IN CENTRAL MS /ONE AN HP SUPERCELL IN ERN
HOLMES AND ATTALA COUNTIES/.  THESE STORMS APPEAR TO BE LOCATED
ALONG THE SRN EXTENT OF A CONVECTIVE OUTFLOW BOUNDARY WHICH WAS
ATTENDANT TO THE LEADING EDGE OF A BAND OF CONVECTION MOVING EWD
THROUGH WRN TN INTO NERN TO WEST CENTRAL MS.  THE SRN EXTENT OF THE
OUTFLOW BOUNDARY WAS INTERACTING WITH A CORRIDOR OF MODERATE
INSTABILITY EXTENDING FROM LA INTO SRN/CENTRAL MS PER OBJECTIVE
ANALYSES.  THIS COMBINED WITH HEIGHT FALLS AND STRONGER FORCING FOR
ASCENT ATTENDANT TO THE COMPACT SHORTWAVE TROUGH TRACKING EAST
TOWARD THE LOWER TN VALLEY SHOULD SUSTAIN THE ONGOING STORMS AND
SUPPORT NEW DEVELOPMENT AS ACTIVITY SPREADS EWD.  A STRENGTHENING
SSWLY LLJ AT 35-40 KT PER WSR-88D VADS AT JAN AND LIX EXTENDING INTO
CENTRAL MS HAS RESULTED IN AN INCREASE OF LOW LEVEL HODOGRAPH
CURVATURE SUCH THAT STORMS ACROSS CENTRAL MS COULD POSE A TORNADO
THREAT.

THE SEVERE WEATHER THREAT SHOULD PERSIST EWD ACROSS CENTRAL
MS...WITH THE RECENT HRRR RUNS SUGGESTING THESE STORMS COULD REMAIN
STRONG-SEVERE AS THEY MOVE INTO WRN AL.  WHILE A FEW ROWS OF AL
COUNTIES WOULD BE AFFECTED...POTENTIAL ALSO EXISTS FOR THE OVERALL
SEVERE WEATHER THREAT TO DIMINISH WITH EWD EXTENT INTO CENTRAL AL AS
THE AFOREMENTIONED OUTFLOW BOUNDARY AND LEADING EDGE OF CONVECTION
OUTRUNS THE GREATER INSTABILITY IN THE LOWER MS VALLEY.
MEANWHILE...THE STORMS MOVING INTO SERN AR MAY WEAKEN ONCE THEY
REACH WEST CENTRAL MS WHERE THE AIR MASS HAS BEEN CONVECTIVELY
OVERTURNED FROM STORMS CURRENTLY IN THAT AREA.

..PETERS.. 04/25/2014

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

ATTN...WFO...BMX...MEG...JAN...LZK...SHV...

LAT...LON   33729274 34109144 34229047 34559000 34998969 34908933
            33998978 33878941 33878875 33828846 34248810 34118722
            33658723 32848755 32548807 32558969 32529077 32189198
            32129244 32199337 33729274



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