MESOSCALE PRECIPITATION DISCUSSION 0004 NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 1123 AM EDT WED MAR 20 2013 AREAS AFFECTED...MD...VA...DC CONCERNING...HEAVY RAINFALL...FLASH FLOODING POSSIBLE VALID 201510Z - 201910Z TEST TEST TEST ATTN...WFO...PHI...AKQ...LWX...RNK... LAT...LON 39607614 38417530 37467702 37267838 37837932 39267797 39607614