622
AWUS01 KWNH 081300
FFGMPD
PAZ000-MDZ000-VAZ000-WVZ000-OHZ000-081557-
MESOSCALE PRECIPITATION DISCUSSION 0973
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
858 AM EDT SAT AUG 08 2026
AREAS AFFECTED...WEST VIRGINIA TO CENTRAL PENNSYLVANIA
CONCERNING...HEAVY RAINFALL...FLASH FLOODING POSSIBLE
VALID 081257Z - 081557Z
SUMMARY... ISOLATED FLASH FLOODING POSSIBLE ACROSS PORTIONS OF
WESTERN VIRGINIA TO CENTRAL PENNSYLVANIA.
DISCUSSION...SATELLITE SHOWS BRIGHTENING CLOUD TOPS AND INCREASING
LIGHTNING NEAR THE WEST VIRGINIA AND PENNSYLVANIA BORDER. RAINFALL
RATES ARE NEARING AN INCH PER HOUR ON AN ISOLATED BASIS WITH
EASTWARD MOVING, TRAINING CELLS EMBEDDED IN ~30 KT WESTERLY FLOW
ALOFT. STORMS ARE EMBEDDED WITH AN AIRMASS CHARACTERIZED BY
1.5-1.7 INCH PWATS AND PERSISTENT LOW-LEVEL MOIST ADVECTION INTO
THE DISCUSSION AREA. INSTABILITY IS MARGINAL (~1000 J/KG), BUT
SUFFICIENT TO MAINTAIN ONGOING ACTIVITY. ADDITIONALLY, A
MID-LEVEL SHORTWAVE TROUGH CENTERED OVER NORTHERN OHIO WAS MOVING
TOWARD THE DISCUSSION AREA, PROVIDING ASCENT TO SUPPORT CONTINUED
HEAVY RAINFALL BENEATH THE STORMS.
ISOLATED FLASH FLOODING IS POSSIBLE IN SENSITIVE TERRAIN IN THE
NORTHERN WEST VIRGINIA -- POTENTIALLY INCLUDING TOWNS OF FAIRMOUNT
AND MORGANTOWN. THE FOOTHILLS OF THE APPALACHIANS IN SOUTHWESTERN
AND CENTRAL PENNSYLVANIA WILL ALSO BE SUSCEPTIBLE TO LOCALIZED
FLOODING. A QUICK 1-2 INCHES OF RAIN IN A HOUR MAY EXCEED LOCAL
FFG THRESHOLDS (CURRENTLY IN THE 1-1.5 INCH/HR RANGE). THE CELLS
ARE LIKELY TO PERSIST AS THEY MOVE EASTWARD AT AROUND 15-25 KNOTS,
REACHING PORTIONS OF SOUTH-CENTRAL PA AND WESTERN MARYLAND THROUGH
15Z/11A EASTERN.
WILDER
..PLEASE SEE WWW.WPC.NCEP.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...CTP...LWX...PBZ...RLX...
ATTN...RFC...RHA...TIR...NWC...
LAT...LON 40707936 40637834 40597743 40297680 39757748
39267847 38747948 38548039 38918149 39198188
39218191 40158130 40568060 40668005
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