[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 192049
SWOMCD
SPC MCD 192049
TNZ000-KYZ000-MSZ000-ILZ000-MOZ000-ARZ000-192145-

MESOSCALE DISCUSSION 0527
NWS STORM PREDICTION CENTER NORMAN OK
0349 PM CDT SUN APR 19 2009

AREAS AFFECTED...ERN AR...SERN MO...NRN MS...WRN TN

CONCERNING...SEVERE THUNDERSTORM WATCH 171...172...

VALID 192049Z - 192145Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
171...172...CONTINUES.

FAST MOVING STORMS OCCASIONALLY TAKING ON SUPERCELLULAR
CHARACTERISTICS WILL CONTINUE TO MOVE ENE THROUGH NRN MS DURING THE
NEXT HOUR...AND THEN MOVE OUT OF WW 172 AND INTO HUN/OHX CWA/S BY
22-23Z. THESE STORMS ARE ENTERING AN ENVIRONMENT THAT IS RAPIDLY
RECOVERING BEHIND EARLIER CONVECTION...WITH CLEARING SKIES ALLOWING
TEMPERATURES TO WARM INTO THE LOW 70S...AND SURFACE DEWPOINTS
INCREASING INTO THE MID 60S. RUC SOUNDINGS INDICATE SEVERAL MID LVL
WARM LAYERS OVER MS...WHICH MAY HINDER MORE ROBUST UPDRAFTS.
HOWEVER...THIS MAY BE OFFSET BY STRONG UPR FLOW SPREADING OVER
RELATIVELY BACKED LOW LVL WINDS...YIELDING EFFECTIVE BULK SHEAR
VALUES AROUND 50-60 KT. THIS FLOW REGIME WILL CONTINUE TO SUPPORT A
THREAT OF LARGE HAIL...DAMAGING WINDS...AND AN ISOLATED TORNADO.

FARTHER W...A FAST MOVING LINE SEGMENT WAS CROSSING THE MS RIVER
INTO NWRN MS...WHILE OTHER MULTICELL CLUSTERS/LINE SEGMENTS WERE
TRAVERSING NERN AR AND SERN MO...WITH ADDITIONAL ACTIVITY SPREADING
INTO SRN IL WHERE SUNSHINE HAS AIDED IN DESTABILIZATION. REMAINING
STORMS NOW OCCURRING WITHIN WW 171 HAVE BEEN SLOW TO INTENSIFY...BUT
SOME POTENTIAL FOR LARGE HAIL REMAINS BEFORE BOUNDARY LAYER
STABILIZES WITH LOSS OF DAYTIME HEATING.

..GARNER.. 04/19/2009

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

ATTN...WFO...OHX...PAH...MEG...JAN...LSX...LZK...SGF...

LAT...LON   33778877 33789085 34469062 36469156 37389117 37418915
            36578956 36558760 33778877



This weather bulletin was brought to you by:
www.nashvilleweather.net