1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pittsburgh, PA wrote its last area forecast discussion before the first event at Aug 3, 1:56 PM EST, 2 hours 49 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
256 PM EDT FRI AUG 3 2001
DECIDED TO RESTRICT FFA AREA TO THOSE POINTS WITH THE SMALLEST FFG IN
MY SE ZONES WHICH ARE ADJACENT TO THE FFA OF CTP. A FEW ISOLD TSTMS DID
DEVELOP SE OF PIT AS INDICATED BY ETA MODEL'S MOIST FLUX CONV. BUT
TSTMS TO N ARE MOVG SE NICELY. ONLY THREAT NOW IS THAT SLOW MOVG TSTMS
HAVE BEST CHC TO CAUSE FLOODING WHERE FFG IS SMALLEST.
FRONT MAY LINGER IN S FOR A WHILE SAT MORN, SO REJECTED 10% POP IN SE
AND USED 30%.
RUC'S IDEA OF TREMENDOUS MOIST FLUX AFT 21Z IN NE OH DOES NOT APPEAR TO
BE PANNING OUT, SO DROPPED POPS IN FARTHER N TO 30% EARLY TONIGHT.
.PBZ...FLASH FLOOD WATCH TIL 10 PM MDZ001-WVZ004-012-021>023-041-
PAZ030>032.The Pittsburgh radar (KPBZ), 137 km away, was scanning. The volume nearest the first event began at 21:46 UTC.
1 flash flood. Local standard time, as filed.
A nearly stationary thunderstorm over Savage River State Forest produced over 2 inches of rainfall in around an hour. This heavy rainfall forced several streams out of their banks in the Merrill area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2001Every state in 2001This day in weather historyWarnings in Maryland, August 2001
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5265636.