A significant Lake Effect Snowfall occurred over the Northwest Mountains of Central Pennsylvania. Storm total snowfall amounts of over a foot were reported across the Snowbelt region of northwest Warren County.
Every event with a place to put it; 2 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 episode as NWS CTP wrote it up.
A significant Lake Effect Snowfall occurred over the Northwest Mountains of Central Pennsylvania. Storm total snowfall amounts of over a foot were reported across the Snowbelt region of northwest Warren County.
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 Dec 3, 7:18 AM EST, 42 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 718 AM EST MON DEC 3 2007 .SYNOPSIS... MUCH COLDER AIR WILL RETURN TO CENTRAL PA TODAY AND TONIGHT BEHIND THE PASSAGE OF THIS MORNING/S COLD FRONT. SIGNIFICANT LAKE EFFECT SNOWS WILL DEVELOP ACROSS THE NORTHWESTERN MOUNTAINS AND THE LAUREL HIGHLANDS MONDAY AND MONDAY NIGHT. WINDS WILL INCREASE TO 20 TO 30 MPH THIS MORNING WITH GUSTS BETWEEN 45 AND 50 MPH THIS AFTERNOON CONTINUING INTO TONIGHT. THE SNOW SHOWERS WILL DECREASE IN COVERAGE TUESDAY AS A WEAK RIDGE OF HIGH PRESSURE DRIFTS OVER THE STATE. QUICKLY FOLLOWING THIS HIGH WILL BE AN ALBERTA CLIPPER TYPE SYSTEM THAT WILL SPREAD SOME LIGHT SNOW OVER THE REGION LATE TUESDAY NIGHT AND WEDNESDAY. && .NEAR TERM /UNTIL 11 AM THIS MORNING/... COLD FROPA ONGOING ACROSS MY AREA CURRENTLY. ALL AREAS ABOVE FREEZING PRECEDING AND JUST BEHIND THE FRONT...SO WILL INCLUDE RAIN CHANGING TO SNOW SHOWERS FOR MOST AREAS AS THE COLDER AIR RUSHES IN DURING THE MORNING HOURS. MANY 30 TO 35 KNOT GUSTS SEEN OVER EASTERN OHIO LAST FEW HOURS...A PREVIEW OF WHATS TO COME OVER CENTRAL PA SHORTLY. WIND ADVISORY REMAINS IN EFFECT FROM 7 AM THIS MORNING TO 7 PM THIS EVENING. LAKE EFFECT SNOW WATCH UPGRADED TO A WARNING EFFECTIVE 15Z TODAY THROUGH 21Z TUESDAY. IN EXCESS OF 8 INCHES WILL BE SEEN OVER MUCH OF WARREN AND MCKEAN COUNTIES FROM THIS EVENT. SNOW ADVISORIES ALSO REMAIN IN EFFECT FOR SOMERSET AND CAMBRIA AS A GOOD TRAJECTORY INTO THE LAURELS WILL BE SUSTAINED FROM TODAY THROUGH TUESDAY AFTERNOON. && .SHORT TERM /11 AM THIS MORNING THROUGH 6 PM TUESDAY/... MAIN STORY TODAY THROUGH TUESDAY AFTERNOON WILL BE SIGNIFICANT LAKE EFFECT SNOWFALL CONDS ACROSS THE NORTHWEST MOUNTAINS AND LAUREL HIGHLANDS. SEVERAL INCHES OF SNOWFALL ALONG WITH BLOWING AND DRIFTING SNOW (ESPECIALLY THROUGH 7 PM THIS EVENING) ARE EXPECTED. SCATTERED SNOW SHOWERS AND EVEN A HEAVIER SQUALL ARE EXPECTED OVER THE REMAINDER OF NORTHERN PENNSYLVANIA EXTENDING INTO THE CENTRAL MOUNTAINS LATER TODAY AND TONIGHT. THE SOUTHEAST COULD SEE A FEW FLURRIES AS WELL. && .LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/... TEMPS WILL REMAIN BELOW NORMAL FOR THE PERIOD WITH 850 MB TEMP ANOMALIES -1 TO -3 S.D. BELOW NORMAL. PERIODS OF SNOW SHOWERS AND FLURRIES WILL BE COMMON...PARTICULARLY ON WEDNESDAY AS A CLIPPER LOW DIVES SOUTHEASTWARD THROUGH THE MID MS/OH VLY AND ALONG/SOUTH OF THE MASON DIXON BRINGING A BAND OF SNOW TO THE AREA WED-THUR. LE SHSN SHOULD BEGIN TO WANE BY EARLY WED AS FLOW WEAKENS AND BACKS IN RESPONSE TO AN APPROACHING CLIPPER LOW DIVING SEWD THRU NRN PLAINS AND INTO THE OH VLY/WV PNHNDL. MDLS GRADUALLY CONVERGING ON AFOREMENTIONED SFC LOW TRACK...WITH CONDS COLD ENUF FOR A BAND OF SNOW ALONG/NORTH OF THE EVENTUAL TRACK. AT FIRST GLANCE...EVOLUTION OF THIS SYS LOOKS SOMEWHAT LIKE THE 18 NOV EVENT...BUT STILL WAY TOO FAR OUT TO GET SPECIFIC. SFC HI PRES IS FCST TO BUILD INTO THE AREA IN THE WAKE OF THE CLIPPER WITH LE SNOW SHOWERS DEVELOPING ACROSS THE WESTERN HIGH TERRAIN INTO THE EARLY PART OF THE WKEND. AS THE SFC HI MOVES OFF THE MID-ATLANTIC COAST...FLOW PATTERN APPEARS TO TRANSITION FROM A MEAN ERN TROF TO MORE OF A PROGRESSIVE/ZONAL FLOW BY EARLY IN THE WEEKEND. THIS SHOULD TRANSLATE INTO A MODERATION IN TEMPS BACK TOWARD MORE SEASONABLE READINGS. && .AVIATION /12Z MONDAY THROUGH FRIDAY/... VERY WINDY AND COLDER CONDITIONS WILL OCCUR TODAY INTO TUESDAY...RESULTING IN AREAS OF SIGNIFICANT LAKE EFFECT/OROGRAPHIC SNOWS ACROSS THE NW MTNS AND LAUREL HIGHLANDS. WIDESPREAD IFR CONDITIONS ARE EXPECTED ACROSS THE WRN AND NRN MTNS IN SNOW SHOWERS WITH AREAS OF MVFR ACROSS THE CENTRAL RIDGE/VALLEY REGION (TAF SITES KAOO...KUNV AND KIPT). FLURRIES AND SCATTERED SNOW SHOWERS WILL FLY ACROSS THE CENTRAL AND SE. ANOTHER...ALBEIT SOMEWHAT WEAKER STORM SYSTEM MOVING SOUTHEAST FROM CANADA DURING THE MIDWEEK WILL BRING PERIODS OF MVFR TO IFR CIGS AND VSBYS IN SNOW/SNOW SHOWERS LATE TUESDAY NIGHT INTO THURSDAY. MAINLY VFR FLYING CONDITIONS ARE EXPECTED TO RETURN FRIDAY AS HIGH PRESSURE BUILDS IN FROM THE MIDWEST. && .CTP WATCHES/WARNINGS/ADVISORIES... WIND ADVISORY UNTIL 7 PM EST THIS EVENING FOR PAZ004>006- 010>012-017>019-024>028-033>037-041-042-045-046-049>053- 056>059-063>066. SNOW ADVISORY UNTIL 4 PM EST TUESDAY FOR PAZ024-033. LAKE EFFECT SNOW WARNING UNTIL 4 PM EST TUESDAY FOR PAZ004-005. && SYNOPSIS...LACORTE/DEVOIR NEAR TERM...LACORTE/DEVOIR SHORT TERM...DEVOIR/LAMBERT LONG TERM...DEVOIR/TYBURSKI AVIATION...GARTNER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 311 AM EST MON DEC 3 2007 PAZ010-011-017-025>028-034>036-056-057-059-063>066-040815- ELK-CAMERON-CLEARFIELD-BLAIR-HUNTINGDON-MIFFLIN-JUNIATA-BEDFORD- FULTON-FRANKLIN-PERRY-DAUPHIN-LEBANON-CUMBERLAND-ADAMS-YORK- LANCASTER- 311 AM EST MON DEC 3 2007 ...WIND ADVISORY IN EFFECT FROM 7 AM THIS MORNING TO 7 PM EST THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. WIND ADVISORY. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY AN ALBERTA CLIPPER STORM SYSTEM WILL DROP SOUTH OF THE REGION AROUND MIDWEEK BRINGING A LIGHT SNOWFALL ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ006-012-018-019-037-041-042-045-046-049>053-058-040815- POTTER-NORTHERN CLINTON-NORTHERN CENTRE-SOUTHERN CENTRE-TIOGA- NORTHERN LYCOMING-SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION- SNYDER-MONTOUR-NORTHUMBERLAND-COLUMBIA-SCHUYLKILL- 311 AM EST MON DEC 3 2007 ...WIND ADVISORY IN EFFECT FROM 7 AM THIS MORNING TO 7 PM EST THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. WIND ADVISORY. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY AN ALBERTA CLIPPER STORM SYSTEM WILL DROP SOUTH OF THE REGION AROUND MIDWEEK BRINGING A LIGHT SNOWFALL ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ004-005-040815- WARREN-MCKEAN- 311 AM EST MON DEC 3 2007 ...WIND ADVISORY IN EFFECT FROM 7 AM THIS MORNING TO 7 PM EST THIS EVENING... ...LAKE EFFECT SNOW WARNING IN EFFECT FROM 10 AM THIS MORNING TO 4 PM EST TUESDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. WIND ADVISORY. LAKE EFFECT SNOW WARNING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. LAKE EFFECT SNOW WARNING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ024-033-040815- CAMBRIA-SOMERSET- 311 AM EST MON DEC 3 2007 ...SNOW ADVISORY IN EFFECT FROM 7 AM THIS MORNING TO 4 PM EST TUESDAY... ...WIND ADVISORY IN EFFECT FROM 7 AM THIS MORNING TO 7 PM EST THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. WIND ADVISORY. SNOW ADVISORY. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SNOW ADVISORY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The national radar mosaic for the moment the first event began.
2 lake-effect snow. Local standard time, as filed.
Storm total snowfall amounts ranged from six to eleven inches across portions of McKean County. Notable snowfall totals included eleven inches at Kane and eight inches at Cyclone.
Storm total snowfall amounts ranged from six to eighteen inches across Warren County. Notable snowfall totals included eighteen inches at Chandlers Valley and ten inches at Warren.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2007Every state in 2007This day in weather historyWarnings in Pennsylvania, December 2007
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: 65798, 65799.