Gusty west winds and low temperatures combined to produce very low wind chills across the region.
Every event with a place to put it; 7 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.
Gusty west winds and low temperatures combined to produce very low wind chills across the region.
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 Feb 7, 3:36 PM EST, 6 hours 24 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 336 PM EST WED FEB 7 2007 .SHORT TERM /TONIGHT THROUGH THURSDAY/... A COLD...AND FOR THE MOST PART...DRY NORTHWEST FLOW ALOFT WILL LIMIT SCATTERED SNOW SHOWERS TO THE WESTERN MTNS THROUGH THURSDAY AND BEYOND. A LARGE PERCENTAGE OF LAKE ERIE IS NOW ICE COVERED WHICH WILL TRIM SENSIBLE AND LATENT HEAT TRANSPORT INTO RELATIVELY WEAK LES SNOW BANDS THAT WILL MOVE NORTH...AND CONSOLIDATE CLOSE TO INTERSTATE 90 TONIGHT. THE SNOW BANDS WILL PUSH SOUTH AND INLAND A BIT LATER THURSDAY MORNING AS THE INCREASING BOUNDARY LAYER DEPTH HELPS TO VEER THE MEAN WIND AROUND TO ABOUT 280 DEG. THE COMBINATION OF EVEN THE LIGHT TO MODERATE WESTERLY BREEZE WITH THE NEAR ZERO TEMPS TONIGHT WILL DROP THE WIND CHILL TO NEAR MINUS 15 ACROSS THE LAUREL HIGHLANDS AND NW MTNS. A WIND CHILL ADVISORY HAS BEE ISSUED FOR THESE AREAS FROM 10 PM TONIGHT TO 10 AM THURSDAY. SNOW ACCUMULATION DURING THE UPCOMING 24 HOURS WILL BE GENERALLY A COATING TO PERHAPS AN INCH ACROSS THE NW MTNS...NEAR AND TO THE EAST OF ROUTE 219...WITH AROUND 3 INCHES POSSIBLE ACROSS FAR NW WARREN COUNTY. SCATTERED FLURRIES WILL MAKE IT AS FAR SE AS A LINE FROM KJST...KFIG AND KELZ. ELSEWHERE...CLEAR TO PARTLY CLOUDY AND COLD CONDITIONS WILL CONTINUE. && .LONG TERM /THURSDAY NIGHT THROUGH WEDNESDAY/... CONTINUED COLD /BLW NORMAL TEMPS/ AND MAINLY DRY WX THE THRU THE WKEND AS MUCH OF NERN NA REMAINS UNDER THE INFLUENCE OF A BROAD UPPER UPR LVL CYC CIRC WITH ERN CANADIAN POLAR VORTEX. SHORT WAVE RIPPLES EMBEDDED WITHIN THE WNWRLY FLOW WILL PUSH A COUPLE OF WEAK SFC TROFS THRU ON THUR/FRI WITH LOW SCHC/CHC POPS STILL CONFINED TO THE FAR NW/NRN COS. VISIBLE SAT IMAGERY FROM EARLIER TODAY REVEALED CONSIDERABLE ICE FORMATION OVER LAKE ERIE...AND THIS IS SUPPORTED BY THE GREAT LAKES COASTAL FORECASTING SYS /GLCFS/ ICE COVERAGE MAP DEPICTING MUCH OF THE LAKE WITH AT LEAST 70% ICE COVER. IN ADDITION...THE NORTHERN AND WESTERN PORTION OF THE LAKE IS AT LEAST 95-100% FROZEN. THIS WILL UNDOUBTEDLY PROHIBIT LAKE MOISTURE FROM BEING TRANSPORTED FAR INLAND. THUS...AGAIN WILL CONTINUE LOW POPS (20-30%) ACROSS THE SNOWBELT AREAS OF NW WARREN CO AS WELL AS THE NW MTNS. THESE VALUES ARE ACTUALLY SLIGHTLY HIGHER THAN SHORT TERM ENS MOS GUID...HOWEVER FOR COLLABORATION PURPOSES HAVE OPTED TO KEEP THEM AT LEAST SCHC. THE GFS DOES HAVE A FAST MOVG CLIPPER SLIDING BY TO OUR SOUTH ON SUNDAY BUT GIVEN THE LACK OF SUPPORT FROM THE OTHER OPERATIONAL MODELS...FEEL THIS FEATURE IS SUSPECT AND WILL IGNORE FOR THE TIME BEING. THE PATTERN BECOMES MORE INTERESTING/ACTIVE BY EARLY NEXT WEEK WITH CONFLUENT MID AND UPPER LEVEL FLOW SITUATED OVER THE NE CONUS...PACIFIC AIR INVADING THE WEST AND THE GOMEX OPENING UP. A MORE POTENT S/W TROF/POLAR VORTEX AND ASSOC SFC CLIPPER SYS SLIDES EWD ACROSS THE UPPER GREAT LAKES AND INTO NRN NEW ENGLAND ON MONDAY...DRAGGING AN ELONGATED SFC CLD FNT SOUTH AND EAST THRU THE REGION. THIS MAY KICK OF SOME SCT -SHSN ACROSS PORTIONS OF CENTRAL PA AS THE FROPA ACTS TO SLIGHTLY REINFORCE THE MODIFIED CA AIRMASS ALREADY IN PLACE. HAVE ADDED IN SOME SMALL POPS FOR MONDAY MAINLY ACROSS THE NORTH CENTRAL 2/3 OF THE AREA. IT ALSO APPEARS THAT THIS FRONT WILL SET UP A BAROCLINIC ZONE ALONG OR JUST SOUTH OF THE MASON- DIXON LINE. THE ECMWF/UKMET/DGEX/GFS AND MREF/GEFS CONTINUE TO AGREE ON MID- LVL S/W ENERGY MOVG EWD THRU THE SRN ROCKIES AND INTO THE CENTRAL PLAINS STATES BY LATE MONDAY/EARLY TUE. MEANWHILE...A SLIGHTLY ANOMALOUS SFC HI BEGINS TO DRIFT SOUTH AND EAST FROM THE NRN PLAINS AND INTO THE NORTHEAST BY THIS TIME...SETTING UP A COLD NERLY FLOW/POTENTIALLY CAD SCENARIO. THIS IS EVIDENT IN THE 850MB U-WIND ANOMALIES WHICH GO NEGATIVE (-)1-2 STD FOR TUE->WED. THE AFOREMENTIONED MID LVL WAVE WILL INDUCE/ENERGIZE A SFC LOW OVR THE SRN PLAINS/LWR MS VLY WITH AN INVERTED TROF XTNDG NEWD INTO THE SRN APPALACHIANS. ATTM...IT LOOKS LIKE THE POSITION OF THE ERN CANADIAN POLAR VORTEX AND SFC HI PRES CENTER UPSTREAM MAY JUST BE A BIT TOO FAR EAST FOR AN IDEAL SRN STREAM SFC LOW TRACK. IN ADDITION...THE IDAHO 700MB RIDGE AXIS ALSO SEEMS A LITTLE EAST OF THE CLIMATOLOGICALLY FAVORED /PSU RULE OF THUMB/ POSITION. NEVERTHELESS...THIS WILL BASICALLY BE THE FIRST CHC OF WIDESPREAD SNOW FOR THE MID ATLANTIC/NERN CONUS THIS WINTER SEASON. THE 12Z MREF/GEFS ENS MEAN BRINGS AN ANOMALOUS SFC LOW FROM THE TN VLY ENEWD TO OFF THE NC COAST BY LATE TUE NIGHT. NRN STREAM SHRTWV DETAILS THAT MAY HAVE A SIGNIFICANT IMPACT ON THIS SYSTEM WILL LIKELY TAKE A WHILE TO RESOLVE. THIS TRACK IS SLIGHTLY SURPRESSED AND WOULD KEEP MUCH OF THE PCPN ALONG AND SOUTH OF THE PA TURNPIKE. DETAILS OF THIS SYS WILL BECOME MORE APPARENT IN TIME AS UNCERTAINTY STILL LOOMS WITH REGARD TO POTENTIAL IMPACTS FOR OUR AREA. WILL CONTINUE TO MONITOR SUBSEQUENT MODEL RUNS AND MAY NEED TO MENTION IN HWO GIVEN INCREASING CONFIDENCE AND RUN-TO-RUN CONSISTENCY. ATTM...THE SRN 1/3 OF THE CWA WOULD HAVE THE BEST SHOT FOR SNOW ACCUMS BUT STILL TO FAR OUT TO BE CERTAIN OF ANYTHING. FOLLOWED CLOSELY TO HPC GUID FOR THE MOST PART IN THE LONGER RANGE. && .AVIATION /21Z-18Z/... VFR FLYING CONDITIONS WILL CONTINUE THROUGH THURSDAY ACROSS THE CENTRAL MTNS AND SUSQ VALLEY...WHILE VFR CIGS AND VSBYS WILL BE MIXED WITH TIMES OF MVFR CIGS AND VSBYS IN SNOW SHOWERS ACROSS THE REGION TO THE NORTHWEST OF A LINE FROM KDUJ TO KBFD. LOCALIZED IFR CIGS AND VSBYS IN LAKE EFFECT SNOWS WILL OCCUR WEST OF KBFD THIS EVENING...AND AGAIN FROM LATE THURSDAY MORNING THROUGH THE AFTERNOON HOURS. && .CTP WATCHES/WARNINGS/ADVISORIES... WIND CHILL ADVISORY FROM 10 PM THIS EVENING TO 10 AM EST THURSDAY FOR PAZ005-006-010-011-017-024-033. && SHORT TERM...LAMBERT LONG TERM...STEINBUGL AVIATION...LAMBERT
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 517 AM EST WED FEB 7 2007 PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046- 049>053-056>059-063>066-081030- WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD- NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN- JUNIATA-SOMERSET-BEDFORD-FULTON-FRANKLIN-TIOGA-NORTHERN LYCOMING- SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR- NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON- CUMBERLAND-ADAMS-YORK-LANCASTER- 517 AM EST WED FEB 7 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT AN AREA OF LIGHT SNOW OCCURRING OVER SOUTHERN PENNSYLVANIA THIS MORNING WILL EXIT THE STATE BY MID MORNING. IN GENERAL LESS THAN AN INCH OF SNOW IS EXPECTED...HOWEVER THIS COULD BE ENOUGH TO CAUSE SOME MINOR PROBLEMS OR SLOW GOING WITH THE MORNING COMMUTE. OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. GARTNER
The national radar mosaic for the moment the first event began.
7 extreme cold/wind chill. Local standard time, as filed.
Temperatures in the single digits, combined with west winds of 10 to 20 mph, produced wind chills of 10 to 15 degrees below zero.
Temperatures in the single digits, combined with west winds of 10 to 20 mph, produced wind chills of 10 to 15 degrees below zero.
Temperatures in the single digits, combined with west winds of 10 to 20 mph, produced wind chills of 10 to 15 degrees below zero.
Temperatures in the single digits, combined with west winds of 10 to 20 mph, produced wind chills of 10 to 15 degrees below zero.
Temperatures in the single digits, combined with west winds of 10 to 20 mph, produced wind chills of 10 to 15 degrees below zero.
Temperatures in the single digits, combined with west winds of 10 to 20 mph, produced wind chills of 10 to 15 degrees below zero.
Temperatures in the single digits, combined with west winds of 10 to 20 mph, produced wind chills of 10 to 15 degrees below zero.
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, February 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: 7672, 7673, 7674, 7675, 7676, 7677, 7678.