Flood, Snyder
- When
- September 23, 4:30 AM EST to 10:30 AM EST
- Where
- Snyder forecast zone
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 40.770, -77.070 (the zone’s center; the record gives no point)
Flood in Pennsylvania, September 23, 2003
Heavy rainfall caused flash flooding across much of Snyder County shortly after midnight on the night of the 23rd. Although flash flooding ended, high water and flooding continued along Middle Creek and Mahantango Creek in the western portions of the county through mid-morning.
Where it happened
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.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 1
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.
What happened
The episode as NWS CTP wrote it up.
Heavy rainfall caused flash flooding across much of Snyder County shortly after midnight on the night of the 23rd. Although flash flooding ended, high water and flooding continued along Middle Creek and Mahantango Creek in the western portions of the county through mid-morning. Numerous reports of road closures and basement flooding were received.
What forecasters said that day
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 Sep 23, 1:45 AM EST, 2 hours 45 minutes earlier.
Area forecast discussion, Sep 23, 1:45 AM EST, 2 hours 45 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 245 AM EDT TUE SEP 23 2003 NCFRB MOVED THRU THE REGION...AND EXPECT IT TO CLEAR OUR ERN ZNS BY SUNRISE. HEAVY RAIN MOST PREVALENT PROBLEM. MAINLY MINOR FLOODING OCCURRING IN A FEW AREAS OF HEAVIER PCPN...BUT SOME LOCAL AREAS GETTING MORE THAN THEIR FAIR SHARE. LTL IF ANY HIGH WINDS REPORTED WITH THIS EVENT. SOME LINGERING SHOWERY PRECIP MAY BE LEFT FOR THE EARLY MORNING HRS IN THE FAR EAST. WITH STRONG VORT MAX TO MOVE OV THE NWRN MTNS TODAY...WL HOLD ONTO THE CHC OF SHOWERS FOR THERE LATE THIS MORNING/THIS AFTN...AND MAY EVEN THROW IN A MENTION OF THUNDER AND GUSTY WINDS. QUIET AND FAIR THEN UNTIL CLDS RETURN LATER WED NIGHT AS FAST PTRN LEADS TO ANOTHER CFP ON THURSDAY. WL MENTION SLGT CHCS WEST WED NIGHT...BUT HOLD MOST PRECIP OUT UNTIL THUR DAYLIGHT. DYNAMICS LOOK TO PASS MAINLY TO OUR N BUT DAYTIME PASSAGE MAY REQUIRE CLOSER ATTN TO SVR PARAMS AS THE EVENT NEARS. XTNDD: DIDN/T TOUCH IT. MANY THINGS CONSPIRING AGAINST ME HAVING A GOOD LOOK AT MDL DATA TONIGHT - CURR WX MANILY. && .PRELIMINARY POINT TEMPS/POPS... HARRISBURG 74 53 77 53 / 20 10 00 30 WILLIAMSPORT 69 47 72 52 / 40 10 10 40 BRADFORD 63 42 69 46 / 40 10 10 40 JOHNSTOWN 64 47 67 49 / 20 10 10 30 ALTOONA 67 48 69 49 / 20 10 10 30 STATE COLLEGE 69 45 71 50 / 20 10 10 30 SELINSGROVE 71 49 75 52 / 30 10 10 30 LANCASTER 78 53 77 52 / 30 10 00 30 YORK 78 54 76 53 / 20 10 00 30 && .CTP WATCHES/WARNINGS/ADVISORIES... PA...NONE. && DANGELO
Hazardous weather outlook, Sep 23, 3:13 AM EST, 1 hour 17 minutes before
PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053- 056>059-063>066-231000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 413 AM EDT TUE SEP 23 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY HEAVY RAIN WILL MOVE EAST OF CENTRAL PENNSYLVANIA THIS MORNING...BUT NOT BEFORE SOME FLOODING HAPPENS. RAINFALL OF 1 TO 3 INCHES IN SPOTS OVERNIGHT WILL KEEP MINOR FLOODING GOING THIS MORNING IN THE MIDDLE AND LOWER SUSQUEHANNA RIVER BASINS. A FEW LOCAL AREAS WILL SEE MODERATE FLOODING. THE FLOODING THREAT WILL LESSEN AFTER THE EARLY MORNING...AS THE RAINS WILL END AROUND SUNRISE. .DAYS TWO THROUGH SEVEN... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ASKED TO CALL WITH RAINFALL REPORTS OF AN INCH OR MORE. DANGELO
In the hours before
Special weather statement, Sep 23, 12:00 AM EST, 4 hours 30 minutes before
PAZ037-041-230600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 100 AM EDT TUE SEP 23 2003 ...STRONG WIND GUSTS WILL AFFECT TIOGA AND LYCOMING COUNTIES... AT 1 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY SHOWERS ACCOMPANIED BY WIND GUSTS BETWEEN 30 AND 40 MPH ALONG A LINE EXTENDING FROM 10 MILES SOUTH OF MANSFIELD TO 11 MILES NORTH OF WILLIAMSPORT...MOVING EAST AT 25 MPH. THE SHOWERS WILL BE NEAR RALSTON AT 1 AM. VERY HEAVY RAIN WILL FALL...AND POSSIBLY CAUSE WATER TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS. WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM. THIS MAY BE STRONG ENOUGH TO DOWN SOME SMALL TREE LIMBS. KL
The radar
The national radar mosaic for the moment the first event began.
Event by event
1 flood. Local standard time, as filed.
What these are
- Flood
- Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornado in Pennsylvania, September 23, 2003
- Tornado in New Jersey, September 23, 2003
- Tornado in New Jersey, September 23, 2003
- Tornado in New Jersey, September 23, 2003
- Damaging Wind in New Jersey, September 23, 2003
- Damaging Wind in Pennsylvania, September 23, 2003
- Flash Flooding and Flooding in Virginia, September 23 to 24, 2003
- Tornadoes and Damaging Winds in Virginia, September 23, 2003
- Flash Flooding and Damaging Wind in North Carolina, September 23, 2003
- Flash Flooding and Damaging Wind in Massachusetts, September 23, 2003
- Flash Flood and Damaging Wind in New York, September 23, 2003
- High Wind in Alaska, September 23 to 24, 2003
More
Every storm in Pennsylvania in 2003Every state in 2003This day in weather historyWarnings in Pennsylvania, September 2003
Sources
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: 5337425.