1 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 Sep 18, 8:34 AM EST, 26 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE STATE COLLEGE PA 934 AM EDT SAT SEP 18 2004 .SHORT TERM (REST OF TODAY THROUGH MONDAY)... UPDATE TO REMOVE HEADLINE FOR FLOOD WATCH WHICH HAS EXPIRED. CUT BACK POPS ACROSS SE TO HELP TIME ENDING OF PCPN. STARTING TO GET SOME BREAKS IN THE OVC...BUT EXPECT THAT TO FILL IN WITH MORE SC AS HEATING GETS GOING...UNTIL SIG DRIER AIR MOVES IN THIS AFTN. && .PREVIOUS DISCUSSION... THE FOLLOWING WAS ORIGINALLY ISSUED AT 310 AM EDT SAT SEP 18 2004 AVIATION... RAIN WILL END FROM NW TO SE THROUGH MID MORNING BUT WIDESPREAD MVFR ALONG WITH ISOLD IFR CONDITIONS WILL CONTINUE THROUGH THEN. AFTER THAT CONDITIONS WILL IMPROVE QUICKLY FOR LATE MORNING INTO EARLY AFTERNOON AS DRIER AIR WORKS IN FROM THE NW. CIGS/VSBYS WILL BE MVFR/VFR DURING THE LATE MORNING AND THEN BECOME VFR BY AFTERNOON. SAT NIGHT...PATCHY FOG A POSSIBILITY WITH PLENTY OF SURFACE MOISTURE...BUT STRONG HIGH PRESSURE ALONG WITH RAPIDLY DRYING AIR WILL INHIBIT WIDESPREAD FOG. SHORT TERM (TODAY THROUGH MONDAY)... LL JET CONTINUES TO PUMP COPIOUS MOISTURE INTO EASTERN PA THIS MORNING...WHILE BACK EDGE OF DEFORMATION ZONE PRECIP MOVING THRU NW MTNS. WIDESPREAD 3-6 INCH RAINFALL SO FAR...WITH ISOLATED REPORTS IN EXCESS OF 8 INCHES. LOOKS LIKE ANOTHER 1-2 INCHES YET TO FALL OVER EASTERN PORTIONS OF CWA BEFORE RAIN CUTS OFF LATER THIS MORNING. WILL CLEAR FLOOD WATCH OVER WARREN AND MCKEAN COUNTIES...WHERE RAIN HAS ENDED AND EMA REPORTING NO SIG PROBLEMS. ELSEWHERE...WILL CONTINUE WATCH THRU MIDNIGHT AS MANY LARGER STREAMS AND RIVERS WILL CONTINUE TO RISE WELL AFTER THE RAIN ENDS THIS AM. HI PRES BUILDS DOWN INTO THE AREA LATER TODAY AND SUNDAY...BRINGING SOME OF THE COOLEST WX YET THIS FALL SEASON. AS WINDS DIE SUN NITE...PATCHY FROST SEEMS POSSIBLE IN THE PROTECTED VALLEYS OF THE NORTH. MODEL 900MB TEMPS THE NEXT COUPLE OF DAYS RUNNING ARND 10C...SUGGEST HIGHS MAINLY IN THE 60S DESPITE NEARLY FULL SUN. LONG TERM (MONDAY NIGHT THROUGH FRIDAY)... MREF DATA CONTINUES TO SUGGEST AN EXTENDED PERIOD OF FAIR WX FOR CENTRAL PA AS LARGE RIDGE BUILDS OVER THE EASTERN CONUS. SFC HI PRES OVER THE REGION WILL LIKELY RESULT IN COOL NIGHTS W/AREAS OF FOG. HOWEVER...850 TEMPS RISING WELL ABV NORMAL FOR SEPT...SUGGEST HIGHS NR 80F BY MIDWEEK. A COLD FRONT COULD APPROACH THE AREA LATE IN THE WEEK. HOWEVER...WILL KEEP POPS IN THE SLGHT CHC CAT. HYDROLOGY... RAINFALL AMOUNTS OF 3-7 INCHES OVER A WIDE AREA HAS TRIGGERED MODERATE OR GREATER FLOODING OVER MUCH OF THE MAINSTEM AND WEST BRANCHES OF THE SUSQUEHANNA AS WELL AS ALONG THE JUNIATA. HEAVY RAIN STILL FALLING AT THIS HOUR OVER ALL BUT FAR NWRN PA EXACERBATING THE FLOODING PROBLEMS. RISES ARE FORECAST TO CONTINUE WELL INTO SATURDAY AT MOST SPOTS...WITH SOME OF THE BIGGER POINTS LIKE HARRISBURG AND DANVILLE FORECAST TO NOT CREST UNTIL LATER SUNDAY OR EVEN MONDAY. && .CTP WATCHES/WARNINGS/ADVISORIES... PA...NONE. && SHORT TERM (UPDATE)...GARTNER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 448 AM EDT SAT SEP 18 2004 PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053- 056>059-063>066-190844- ADAMS PA-BEDFORD PA-BLAIR PA-CAMBRIA PA-CAMERON PA-CLEARFIELD PA- COLUMBIA PA-CUMBERLAND PA-DAUPHIN PA-ELK PA-FRANKLIN PA-FULTON PA- HUNTINGDON PA-JUNIATA PA-LANCASTER PA-LEBANON PA-MCKEAN PA- MIFFLIN PA-MONTOUR PA-NORTHERN CENTRE PA-NORTHERN CLINTON PA- NORTHERN LYCOMING PA-NORTHUMBERLAND PA-PERRY PA-POTTER PA- SCHUYLKILL PA-SNYDER PA-SOMERSET PA-SOUTHERN CENTRE PA- SOUTHERN CLINTON PA-SOUTHERN LYCOMING PA-SULLIVAN PA-TIOGA PA- UNION PA-WARREN PA-YORK PA- 448 AM EDT SAT SEP 18 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY: HEAVY RAIN WILL TAPER OFF OVER THE SUSQUEHANNA VALLEY BY LATE MORNING. HOWEVER...FLOODING WILL CONTINUE THROUGH MUCH OF THE DAY OVER ALL OF CENTRAL PENNSYLVANIA...WITH THE EXCEPTION OF THE NORTHWEST MOUNTAINS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY: ALTHOUGH FLOODING OF SMALLER STREAMS AND LOW LYING AREAS WILL SUBSIDE BY LATE SATURDAY...FLOODING ON MANY OF THE LARGER RIVERS WILL OCCUR SUNDAY AND A PORTION OF MONDAY. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 417 AM EDT SAT SEP 18 2004 PAZ059-180915- LEBANON- 417 AM EDT SAT SEP 18 2004 ...STRONG THUNDERSTORMS WITH VERY HEAVY RAIN AND GUSTY WINDS WILL AFFECT LEBANON COUNTY THROUGH 515 AM... AT 411 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTHEAST OF ELIZABETHTOWN TO 2 MILES NORTHEAST OF LITITZ TO 3 MILES SOUTHEAST OF NEW HOLLAND...MOVING NORTH AT 25 MPH. THE THUNDERSTORMS WILL BE NEAR PALMYRA...CORNWALL AROUND 425 AM...CLEONA...ANNVILLE AROUND 430 AM... LEBANON...KLEINFELTERSVILLE AROUND 435 AM...HARPER TAVERN...SAND HILL...RICHLAND AND MYERSTOWN AROUND 440 AM. WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THESE STORMS. VERY HEAVY RAIN WILL FALL ALSO FALL...AND WILL CAUSE WATER TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS. LAMBERT
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Heavy rain caused the West Branch of the Susquehanna River at Muncy to exceed its flood stage of 20 feet. The river rose above flood stage at 09:00 EST on the 18th, crested at 28.8 feet at 01:00 EST on the 19th, and fell below flood stage at 17:00 EST on the 20th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2004Every state in 2004This day in weather historyWarnings in Pennsylvania, September 2004
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: 5423885.