SWOMCD
SPC MCD 281723
VAZ000-NCZ000-WVZ000-TNZ000-GAZ000-281830-
MESOSCALE DISCUSSION 0732
NWS STORM PREDICTION CENTER NORMAN OK
1223 PM CDT FRI MAY 28 2010
AREAS AFFECTED...ERN TN...WRN VA...WRN NC...NRN GA
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 281723Z - 281830Z
STRONG BOUNDARY LAYER HEATING HAS STEEPENED LOW LEVEL LAPSE RATES
ALONG THE SPINE OF THE APPALACHIANS...AND IMMEDIATE SURROUNDING
LOWER ELEVATIONS...SFC-3KM VALUES ON THE ORDER OF 9 C/KM. LATEST
SATELLITE IMAGERY SUPPORTS CONVECTIVE TEMPERATURES BEING REACHED
WITH NUMEROUS SHOWERS/THUNDERSTORMS DEVELOPING WITHIN MODERATELY
UNSTABLE AIRMASS...MLCAPE VALUES IN EXCESS OF 2000 J/KG. ALTHOUGH
ENVIRONMENTAL SHEAR IS QUITE WEAK...PULSE-TYPE THUNDERSTORMS WILL
CONTINUE TO DEVELOP WITHIN MOIST BOUNDARY LAYER UNTIL CONVECTIVE
OUTFLOW/OVERTURNING STABILIZES LOW LEVEL AIRMASS. IF SUFFICIENT
THUNDERSTORM MERGERS OCCUR...AN E-W ZONE OF LOW LEVEL CONVERGENCE
COULD SHIFT INTO THE NRN GULF STATES FROM NRN GA INTO NRN AL.
ISOLATED DOWNBURSTS AND MARGINALLY SEVERE HAIL COULD ACCOMPANY THE
STRONGER CELLS.
..DARROW.. 05/28/2010
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RNK...RLX...GSP...MRX...FFC...OHX...
LAT...LON 35118578 36068533 36198353 37288171 36328131 35058297
34528478 35118578
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