[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 261248
SWOMCD
SPC MCD 261247
NCZ000-VAZ000-SCZ000-TNZ000-GAZ000-261415-

MESOSCALE DISCUSSION 0590
NWS STORM PREDICTION CENTER NORMAN OK
0747 AM CDT THU APR 26 2012

AREAS AFFECTED...EASTERN TN/NORTH GA AND SOUTHWEST VA/WESTERN
CAROLINAS

CONCERNING...SEVERE THUNDERSTORM WATCH 189...190...

VALID 261247Z - 261415Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
189...190...CONTINUES.

SEVERE TSTM WATCH REMAINS IN EFFECT UNTIL 17Z...WITH A CONTINUED
DAMAGING WIND/MARGINALLY SEVERE HAIL THREAT THIS MORNING. CONVECTIVE
TRENDS OF THE ONGOING MCS WILL BE CLOSELY MONITORED EASTWARD OUT OF
THE MOUNTAINS REGARDING THE NECESSITY OF A SPATIAL EXTENSION OF WW
190 AND/OR A NEW SEVERE TSTM WATCH.

A WELL-ORGANIZED/FAST-MOVING MCS CONTINUES TO EXPAND/RACE
EAST-SOUTHEASTWARD ACROSS THE SOUTHERN APPALACHIANS REGION THIS
MORNING. A VERY UNSTABLE AIRMASS CONTINUES TO FEED INTO THE WESTERN
PERIPHERY OF THE MCS...WITH THE RECENT 12Z OBSERVED SOUNDING FROM
NASHVILLE INDICATIVE OF VERY STEEP 8.4 C/KM MID-LEVEL LAPSE RATES
AND 3000+ J/KG MUCAPE. THE WESTERNMOST FLANK OF THE MCS WILL
CONTINUE TO SEE THE MOST INTENSE UPDRAFTS/GREATEST HAIL POTENTIAL.
MEANWHILE...THE EASTERNMOST/LEADING PORTION OF THE MCS IS NOW
QUICKLY MOVING ACROSS THE SPINE OF THE APPALACHIANS. RECENT WSR-88D
VWP DATA FROM MORRISTOWN TN IS INDICATIVE OF 60+ KT MCS-REARWARD
WESTERLY WINDS WITHIN THE LOWEST 1.5-3 KM AGL. MORE REMOVED FROM THE
PRIMARY INSTABILITY FEED...THE SPECIFIC EVOLUTION OF THE MCS EAST OF
THE MOUNTAINS IS UNCERTAIN INTO A MORE STABLE BOUNDARY LAYER.
NONETHELESS...PRE-MCS INSOLATION...AND MORE SO THE FAST FORWARD
MOMENTUM OF THE MCS AND ASSOCIATED WELL-ORGANIZED/MCV
CHARACTERISTICS...MAY CONTINUE TO YIELD A SEVERE WIND/SOME HAIL
THREAT EAST OF THE MOUNTAINS THIS MORNING.

..GUYER.. 04/26/2012

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

ATTN...WFO...RAH...RNK...CAE...GSP...MRX...FFC...OHX...

LAT...LON   35848509 35648267 36738226 37178181 36677973 35278047
            33978224 34508495 35848509


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