[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 201755
SWOMCD
SPC MCD 201755
GAZ000-SCZ000-ALZ000-TNZ000-MSZ000-201900-

MESOSCALE DISCUSSION 0930
NWS STORM PREDICTION CENTER NORMAN OK
1255 PM CDT FRI MAY 20 2005

AREAS AFFECTED...PORTIONS OF THE TN VALLEY INTO MUCH OF MS/AL/GA

CONCERNING...SEVERE THUNDERSTORM WATCH 300...

VALID 201755Z - 201900Z

NEW WW/S ARE BEING CONSIDERED FOR MUCH OF NRN/CENTRAL MS AND EWD
ACROSS CENTRAL AL.  ONGOING THREAT FOR DAMAGING WINDS AND HAIL WILL
CONTINUE ACROSS WW 300 WITH ADDITIONAL STORMS DEVELOPING AND MOVING
SEWD FROM SRN MIDDLE TN TO NRN/CENTRAL GA.

18Z SURFACE ANALYSIS INDICATED A PRIMARY LOW OVER MIDDLE TN ALONG
THE SYNOPTIC BOUNDARY...WITH SEVERAL SURFACE TROUGHS EXTENDING SWD
AND WSWWD FROM THIS LOW INTO CENTRAL AL/SRN MS AND ACROSS NRN
PORTIONS OF NRN AL/MS INTO AR. AIR MASS ALONG AND SOUTH OF THESE
TROUGHS HAS BECOME MODERATELY UNSTABLE WITH MLCAPE VALUES UP TO 2000
J/KG.

***POTENTIAL WW/S NRN/CENTRAL MS INTO CENTRAL AL***
VIS/RADAR IMAGERY SHOW THUNDERSTORMS DEVELOPING ALONG SURFACE
TROUGHS INTO NRN AL/MS AND INTO CENTRAL AL/SERN MS.  DEEP LAYER
SHEAR WILL CONTINUE TO INCREASE SWD ACROSS MS/AL WITH 35-45 KT OF
SFC-6 KM SHEAR SUPPORTIVE OF SUPERCELLS WITHIN MODERATELY UNSTABLE
AIRMASS.  HAIL AND DAMAGING WINDS WILL BE THE PRIMARY THREATS.

***WW 300***
REGIONAL RADARS SHOW SEVERAL LINE OF STORMS WITHIN WW 300 MOVING TO
THE SE ALONG THE INSTABILITY GRADIENT AND WITHIN NWLY FLOW ALOFT.
LARGE SCALE ASCENT IN ADVANCE OF THE SHORT WAVE TROUGH OVER CENTRAL
KY INTO NRN AL AND CONVERGENCE ALONG SURFACE TROUGHS AND OUTFLOW
BOUNDARIES WILL CONTINUE TO SUPPORT A THREAT FOR SEVERE STORMS
ACROSS ALL OF WW 300.

..PETERS.. 05/20/2005

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

ATTN...WFO...CHS...CAE...GSP...JAX...MRX...FFC...TAE...OHX...BMX...HUN...MOB...MEG...JAN...

35988808 33958223 31438218 31878429 31578599 31258777
31308905 31538982 32499050 33989045 35038986 34988814

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