212
AWUS01 KWNH 081626
FFGMPD
NJZ000-PAZ000-DEZ000-MDZ000-081954-
MESOSCALE PRECIPITATION DISCUSSION 0975
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1225 PM EDT SAT AUG 08 2026
AREAS AFFECTED...I-95 URBAN CORRIDOR FROM BALTIMORE TO
PHILADELPHIA
CONCERNING...HEAVY RAINFALL...FLASH FLOODING POSSIBLE
VALID 081624Z - 081954Z
SUMMARY...A FEW AREAS OF HEAVY RAINFALL COULD POSE A PRIMARILY
URBAN FLASH FLOOD THREAT ALONG THE I-95 CORRIDOR OVER THE NEXT 2-4
HOURS.
DISCUSSION...A FORWARD-PROPAGATING LINE OF CONVECTION IS CURRENTLY
ORGANIZED ALONG AN AXIS FROM YORK/HARRISBURG, PA SOUTHWESTWARD TO
FREDERICK, MD. THE STORMS ARE MOVING AT A DECENT PACE (AROUND
25-30 KNOTS OR SO), BUT ARE IN AN ENVIRONMENT CHARACTERIZED BY 1.8
INCH PW VALUES AND ~2000 J/KG MLCAPE. THE DOWNSTREAM AIRMASS WILL
LIKELY SUPPORT A CONTINUED HEAVY RAINFALL THREAT WITH THIS
ACTIVITY, AND AREAS OF 0.5 INCH/HR RAIN RATES (LOCALLY HIGHER)
WILL ACCOMPANY THIS ACTIVITY AS IT REACHES THE BALTIMORE TO
PHILADELPHIA I-95 CORRIDOR AND SURROUNDING AREA THROUGH
APPROXIMATELY 1730-1830Z (130-230P EASTERN). LOCAL FFG THRESHOLDS
ARE NEAR ZERO ACROSS BALTIMORE AND CLOSER TO 1 INCH/HR NEAR
PHILADELPHIA, THOUGH URBAN SENSITIVITIES COULD RESULT IN EXCESSIVE
RUNOFF EVEN WITH SUB-FFG THRESHOLD RAINFALL RATES. AREAS OF
PRIMARILY URBAN FLASH FLOOD INSTANCES ARE POSSIBLE.
COOK
..PLEASE SEE WWW.WPC.NCEP.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...CTP...LWX...PHI...
ATTN...RFC...RHA...NWC...
LAT...LON 40707502 40327430 39517416 38937483 38707660
39197709 40397687 40617627
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