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 State College, PA wrote its last area forecast discussion before the first event at Aug 12, 2:00 PM EST, 4 hours 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 300 PM EDT SUN AUG 12 2001 SHORTWAVE TROF APPROACHING FROM THE WEST WILL CONTINUE TO SUPPORT SHOWER/TSTM ACTIVITY ACROSS MUCH OF THE CWA THROUGH THIS EVENING AS IT INTERACTS WITH MOIST AMS AND FRONTAL BOUNDARY ACROSS SRN PA. STRONGEST ACTIVITY CONTINUES TO BE TO THE SOUTH OF PA AND EXPECT THIS TO CONTINUE...THOUGH AREAS OF HEAVIER STORMS OVER CENTRAL MD WILL WORKS ITS WAY NEWD INTO LOWER SUSQ VALLEY OVER THE NEXT SEVERAL HOURS. GIVEN ABOVE RADAR TRENDS...SPOTTY NATURE OF HEAVY ACTIVITY OVER THE LAST COUPLE OF DAYS AND HIGH FFG VALUES/LONGER TERM DRY CONDITIONS...WILL NOT ISSUE FFA ATTM. HOWEVER LOCALIZED HEAVY RAINS ARE POSSIBLE AND HAVE INCLUDED IN THE ZONES WHERE APPROPRIATE..BASICALLY SERN HALF OF CWA. MUCH OF THE WEEK CONTINUES TO SHAPE UP NICELY ONCE THIS SYSTEM EXITS SOME TIME MONDAY. KEPT CHANCE FOR LINGERING MORNING SHOWERS OVER ERN PARTS OF CWA. ACCORDING TO HPC MDM RANGE GUIDANCE...NEXT CHANCE FOR PCPN WILL STILL BE FRI WITH FROPA AND AGAIN SUN WITH COMMONWEALTH IN A SQUEEZE PLAY BETWEEN TWO FRONTS SIMILAR TO TODAY. WRKMIS ALREADY OUT. THAT IS ALL. CTP...NONE GARTNER
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Heavy rain from thunderstorms caused flooding in Lancaster County. Route 30, between Route 896 and the town of Gap, was closed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2001Every state in 2001This day in weather historyWarnings in Pennsylvania, 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: 5260651.