ZCZC SPCSWOMCD ALL
ACUS11 KWNS 202227 
SPC MCD 202227 
NCZ000-VAZ000-210000-

MESOSCALE DISCUSSION 0405
NWS STORM PREDICTION CENTER NORMAN OK
0527 PM CDT MON APR 20 2015

AREAS AFFECTED...PORTIONS OF VA AND NC

CONCERNING...SEVERE THUNDERSTORM WATCH 89...

VALID 202227Z - 210000Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 89
CONTINUES.

SUMMARY...SOME SVR RISK PERSISTS ACROSS WW 89.

DISCUSSION...ISOLATED TO WIDELY SCATTERED STORMS...LOCALLY ORGANIZED
IN SMALL CLUSTERS...ARE ONGOING ACROSS WW 89 AND WILL CONTINUE
SPREADING ENEWD/NEWD. WIDESPREAD MID/HIGH CLOUDS HAVE STUNTED
DIURNAL INCREASES IN LOW-LEVEL LAPSE RATES...THOUGH BOUNDARY-LAYER
MOISTURE REMAINS ADEQUATE FOR AROUND 750-1000 J/KG OF MLCAPE. STRONG
MID/HIGH-LEVEL FLOW SAMPLED BY THE RAX VWP BREEDS AMPLE DEEP SHEAR
AND CONVECTIVE VENTILATION TO MAINTAIN SEMI-ORGANIZED CONVECTIVE
STRUCTURES WITH MARGINALLY SVR WIND/HAIL POSSIBLE. NOCTURNAL COOLING
AND THE LACK OF STRONGER DEEP ASCENT SHOULD RESULT IN A DECREASE IN
CONVECTIVE COVERAGE/INTENSITY THROUGH THE EVENING.

..COHEN.. 04/20/2015

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

ATTN...WFO...AKQ...LWX...RAH...RNK...

LAT...LON   35087993 35728005 36148039 36378150 37298046 37587874
            37797667 36727624 36137691 36567786 35337917 35087993 

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