MESOSCALE PRECIPITATION DISCUSSION 0225
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
227 PM EDT TUE MAY 29 2018

AREAS AFFECTED......NORTHEAST GA/WESTERN SC/WESTERN NC...

CONCERNING...HEAVY RAINFALL...FLASH FLOODING POSSIBLE

VALID 291830Z - 300030Z

SUMMARY...HEAVY SHOWERS AND A FEW THUNDERSTORMS EXPECTED THIS
AFTERNOON WITH HIGH RAIN RATES OF 1-2 INCHES PER HOUR OVER A SHORT
DURATION...

THE SATELLITE AND RADAR DATA INDICATES A SLOWLY GROWING CLUSTER OF
SHOWERS AND A FEW THUNDERSTORMS ACROSS GEORGIA AND INTERIOR
SECTIONS OF SOUTH AND NORTH CAROLINA.

MOIST DEEP LAYER SOUTHEAST FLOW IS ADVECTING DEEP MOISTURE INLAND
WITH UPSLOPE FLOW OCCURRING THIS AFTERNOON INTO THE EVENING AS THE
CYCLONIC CIRCULATION OF THE DEPRESSION TO THE WEST IN ALABAMA
CONTINUES. 

COUPLED UPPER DIVERGENCE AND BOUNDARY LAYER MOISTURE CONVERGENCE
COMBINE WITH AN UPSLOPE COMPONENT OF FLOW TO SUPPORT ADDITIONAL
SHOWERS/STORMS THROUGH THE REST OF AFTERNOON INTO THE EVENING IN
NORTHEAST GA/WESTERN SOUTH CAROLINA AND WESTERN NORTH CAROLINA.
OBSERVED AND FORECAST SOUNDINGS SHOW POCKETS OF 90 PERCENT LAYER
RELATIVE HUMIDITY...FAVORING EFFICIENT RAINFALL PROCESSES.

CLUSTERS OF 1-2 INCHES OF RAIN WITH ISOLATED 3 INCH MAXIMA ARE
EXPECTED WHERE CELL MERGERS OCCUR.  THIS IS IN LINE WITH THE 12Z
RUNS OF THE WRF ARW/NMMB/ARW 2 RUNS TODAY. 
THE 15-17 HIGH RES RAPID REFRESH RUNS INDICATED ISOLATED 4 INCH
TOTALS ARE POSSIBLE IN WESTERN NORTH CAROLINA.

PETERSEN   

ATTN...WFO...FFC...GSP...MRX...RNK...

ATTN...RFC...LMRFC...OHRFC...SERFC...

LAT...LON   36148159 35898091 35588083 35018120 34428215
            34088374 34128419 34538436 34818416 34938387
            35228359 35718275 36108206