[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 020055
SWOMCD
SPC MCD 020054
NCZ000-GAZ000-TNZ000-ALZ000-020200-

MESOSCALE DISCUSSION 1678
NWS STORM PREDICTION CENTER NORMAN OK
0754 PM CDT WED AUG 01 2012

AREAS AFFECTED...MIDDLE/SERN TN...NRN AL...NRN GA

CONCERNING...SEVERE THUNDERSTORM WATCH 546...

VALID 020054Z - 020200Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 546
CONTINUES.

SUMMARY...GREATEST SVR WEATHER THREAT THIS EVENING FOR WW 546 WILL
GENERALLY BE CONFINED TO PORTIONS OF MIDDLE AND SERN TN. ISOLATED
SVR STORMS MAY SPREAD SEWD INTO NRN AL AND NRN GA...BUT AN
ADDITIONAL WW DOES NOT APPEAR NECESSARY ATTM.

DISCUSSION...AT 0045Z...CLUSTER OF THUNDERSTORMS WAS LOCATED OVER
MIDDLE TN...WITH ANOTHER CLUSTER OF STRONG/SVR STORMS POSITIONED
OVER FAR SERN TN. THIS ACTIVITY IS GENERALLY MOVING SEWD AT 25
KT...WHICH WILL RESULT IN SERN TN COMPLEX ENTERING NRN GA DURING THE
NEXT HR. THE 00Z FFC AND BMX RAOBS SHOW THAT THE COMBINATION OF A
VERY HOT AND MOIST BOUNDARY LAYER...AS WELL AS MIDLEVEL LAPSE RATES
FROM 6-7 C/KM...IS AIDING IN STRONG INSTABILITY WITH MUCAPE VALUES
IN EXCESS OF 3500 J/KG. THOUGH INSTABILITY WILL DECREASE AS SURFACE
AIRMASS COOLS THIS EVENING...A FEW STRONG/SVR THUNDERSTORMS MAY
PERSIST DUE TO THE CONTINUED PRESENCE OF AMPLE CAPE AND UPPER
SUPPORT FROM A WAVE MOVING SEWD ACROSS KY/TN. THUS...SRN PORTIONS OF
WW 546 WILL CONTINUE TO EXPERIENCE A THREAT FOR LARGE HAIL/DAMAGING
WIND GUSTS THROUGH 03Z...WITH AT LEAST AN ISOLATED SVR THREAT
POSSIBLE S OF THE WATCH OVER NRN AL/GA.

..GARNER.. 08/02/2012

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

ATTN...WFO...GSP...MRX...FFC...OHX...BMX...HUN...MEG...

LAT...LON   34658716 35588802 36088726 35278382 33948405 34658716


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