Up to 8 inches of snow was reported in the interior of western Washington. This event was part of a suite of hazardous winter weather as a deep Pacific storm system offshore also later created strong damaging winds primarily in the coastal region, heavy rainfall, flooding, landslides and avalanches in the Cascades.
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 SEW wrote it up.
Up to 8 inches of snow was reported in the interior of western Washington.
This event was part of a suite of hazardous winter weather as a deep Pacific storm system offshore also later created strong damaging winds primarily in the coastal region, heavy rainfall, flooding, landslides and avalanches in the Cascades.
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 Seattle, WA wrote its last area forecast discussion before the first event at Dec 1, 4:00 AM PST, 2 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SEATTLE WA 400 AM PST SAT DEC 1 2007 .SYNOPSIS...A WEATHER SYSTEM MOVING SOUTH THROUGH BRITISH COLUMBIA WILL BRING LIGHT SNOW TO WESTERN WASHINGTON TODAY AND TONIGHT. A VERY MOIST PACIFIC FRONTAL SYSTEM WILL BRING SNOW AND THEN RAIN ON SUNDAY. A THIRD VERY WET SYSTEM WILL BRING HEAVY RAIN AT TIMES SUNDAY NIGHT AND MONDAY...ALONG WITH VERY WINDY CONDITIONS TO PARTS OF THE AREA. MORE TYPICAL SHOWERY WEATHER WILL RETURN TUESDAY THROUGH FRIDAY. && .SHORT TERM...THIS WILL BE A WEATHER FILLED WEEKEND. SNOW IN THE LOWLANDS...HEAVY SNOW IN THE MOUNTAINS... WIND...AND HEAVY RAIN LEADING TO POSSIBLE FLOODING ARE ALL ON THE MENU OUT THROUGH MONDAY. DETAILS REGARDING HOW MUCH SNOW AND WHERE REMAIN VERY UNCERTAIN. TODAY IS STILL SHAPING UP ABOUT AS EXPECTED WITH UP TO 3 INCHES OF SNOW EXPECTED ACROSS MUCH OF THE AREA BY LATE THIS EVENING. BIGGEST UNCERTAINTY IS THE POTENTIAL FOR SNOW SUNDAY MORNING...AND HOW AND WHEN THE RAIN-SNOW LINE MOVED N THROUGH THE AFTERNOON. PREVIOUS FORECAST FOR SUNDAY HAD ALL RAIN. SNOW IN THE MOUNTAINS IS THE EASIER PROBLEM WITH THE HEAVIEST SNOWFALL EXPECTED ON SUNDAY. THEN HEAVY RAIN SUNDAY NIGHT/MONDAY. NOW THE HOPEFULLY SHORT VERSION OF THE GORY DETAILS. LOWLAND SNOW. NAM AND MM5GFS STILL VARY WITH QPF AND TEMPERATURE DETAILS...SO HAVE STUCK PRETTY MUCH WITH THE PREVIOUS FORECAST. HAVE ISSUED A BROAD-BRUSHED SNOW ADVISORY FOR ALL THE LOWLANDS EXCEPT THE EAST STRAIT OF JUAN DE FUCA. 06Z NAM TIMING HAS PRECIP ON THE COAST AFTER 18Z SO THE SNOW ADVISORY STARTS THEN. SNOW SPREADS TO ABOUT PUGET SOUND WESTWARD BY 4 PM THEN JUST ABOUT ALL AREAS DURING THE EVENING. FOR SIMPLICITY WILL FIGURE ON UP TO 3 INCHES FOR MOST AREAS...EXCEPT SE WINDS COULD DROP SOME LOCAL 4-5 INCH AMOUNTS S OF THE OLYMPICS AND ALONG HOOD CANAL. OLYMPICS RAIN SHADOW SPARES THE STRAIT OF JUAN DE FUCA (EXCEPT W OF PORT ANGELES) FROM MORE THAN 1 INCH. SHOULD SEE THE SNOW TAPER OFF A LITTLE LATE TONIGHT AND THERE MAY BE ENOUGH LOW LEVEL WARMING TO HAVE SOME RAIN MIXED IN (COAST SHOULD CHANGE TO RAIN). THERE IS NOT MUCH OF A BREAK BETWEEN TODAYS SYSTEM COMING DOWN FROM B.C. AND THE NEXT WARM WET ONE (OFFSHORE NEAR 35N/145W) THAT MOVES IN LATE TONIGHT. BIGGEST QUESTION IS THE POTENTIAL FOR SIGNIFICANT SNOW SUNDAY MORNING AS STRONG WARM ADVECTION FROM THIS NEXT SYSTEM PRODUCES HEAVIER PRECIP OVER THE AREA. IF THE PRECIP IS HEAVY ENOUGH SUNDAY MORNING IT COULD OVERCOME ANY WARMING PRODUCED EARLY-ON BY THE SYSTEM...RESULTING IN RAIN CHANGING BACK TO SNOW OR EVEN MODERATE SNOW. NAM/MM5GFS SURFACE TEMPS IN THE UPPER 30S ARGUES FOR JUST RAIN BUT THE MODELS SOMETIMES DONT DO VERY WELL WITH THE COOLING EFFECTS OF HEAVY PRECIP. THIS POSSIBILITY IS STILL TOO UNCERTAIN TO GO OVERBOARD...SO HAVE CHANGED THE SUNDAY FORECAST TO INDICATE SOME SNOW EARLY...BUT WITH REALLY LOW ACCUMULATIONS. SNOW SHOULD CHANGE TO RAIN BY MIDDAY OVER JUST ABOUT EVERYWHERE EXCEPT THE FAR NORTH INTERIOR. HEAVY SNOW IN THE MOUNTAINS. WITH ALL THE PROBLEMS REGARDING LOWLAND SNOW WILL CONTINUE THE PREVIOUS FORECAST FOR THE MOUNTAINS. THE EVENT STARTS FOR THE CASCADES THIS AFTERNOON...BUT SNOWFALL WILL REMAIN RATHER LIGHT UNTIL WARM ADVECTION KICKS IN LATER TONIGHT. MOUNTAIN SNOW WILL SHOW HARDLY ANY PERCEPTIBLE BREAK BETWEEN THE 1ST AND 2ND SYSTEM. THE HEAVIEST SNOWFALL WILL BE TONIGHT AND EVEN MORE ON SUNDAY. POSSIBLE FLOODING. THE 3RD SYSTEM IS FORECAST TO FOLLOW RIGHT BEHIND SUNDAYS SYSTEM. GFS HAS BEEN CONSISTENT SHOWING RISING SNOW LEVELS AND HEAVY RAIN OVER THE MOUNTAINS SUNDAY NIGHT AND MONDAY. GFS BRINGS THE PLUME OF MOISTURE FEEDING THE 3RD SYSTEM UP FROM AROUND HAWAII SO THIS IS LOOKING KIND OF LIKE A PINEAPPLE EXPRESS. GFS FORECAST 850 MB WINDS FOR 18Z MONDAY ARE UP ABOUT 80KT...ONLY THE HIGHEST IVE EVER SEEN THEM FORECAST FOR THAT SPOT JUST SW OF THE OLYMPICS. WILL UPDATE THE FLOOD POTENTIAL OUTLOOK AND MENTION LATE MONDAY AND TUESDAY FOR POSSIBLE FLOODING. HIGH WIND...THE FIRST TWO SYSTEMS DONT PRODUCE ANY SIGNIFICANT WIND. THE THIRD ON MONDAY COULD PRODUCE HIGH WINDS ALONG THE COAST AND OVER THE WESTERN STRAIT. STRONG WINDS OVER THE N INTERIOR ARE ALSO POSSIBLE...BUT THE SURFACE GRADIENT DOESNT SEEM QUITE AS STRONG AS ALONG THE COAST. THIS IS STILL MORE THAN 2 DAYS OUT SO WITH ALL THE OTHER WEATHER...WILL JUST MONITOR FOR NOW. KAM .LONG TERM...THE ACTIVE WEATHER PATTERN CONTINUES BUT WITH WEAKER SYSTEMS...BUT NOT QUITE AS WILD. BROADBRUSH SHOWERS IS FINE FOR NOW. KAM && .AVIATION...LITTLE CHANGE IN THINKING FOR TODAY...HOWEVER...MUCH UNCERTAINTY EXISTS REGARDING PRECIP TYPE OVER LOWLAND AREAS TONIGHT INTO SUNDAY MORNING. FOR TODAY...SURFACE LOW PRESSURE IS BEGINNING TO FORM OFF VANCOUVER ISLAND WITH LOW LEVEL OFFSHORE FLOW CONTINUING. THE LATEST RADAR LOOP IS BEGINNING TO SHOW SOME ECHO RETURNS...PROBABLY IN THE FORM OF VIRGA. HOWEVER...FLURRIES ARE LIKELY TO DEVELOP THIS MORNING LOW LEVELS BEGIN TO MOISTEN A BIT. THE STEADIER SNOW WILL BEGIN ON THE COAST LATER THIS MORNING...SPREADING INLAND DURING THE AFTERNOON...AND ALL AREAS BY EARLY THIS EVENING. ANYWHERE FROM A TRACE TO A COUPLE INCHES ARE POSSIBLE AT ALL TAF SITES W/ PREDOMINATELY MVFR CONDS W/ TEMPO IFR....THROUGH EARLY THIS EVENING. SNOW WILL CHANGE TO RAIN FIRST ALONG THE COAST DURING THE AFTERNOON. IT IS STILL HIGHLY UNCERTAIN WHEN THE INTERIOR WILL CHANGE TO RAIN...IF AT ALL. MY CURRENT THINKING IS A MIX OF RAIN AND SNOW FROM SEATTLE SOUTH BY 04-06Z...AND STAYING MAINLY SNOW N OF SEATTLE THROUGH THE NIGHT W/ A COUPLE MORE INCHES POSSIBLE...INCLUDING THE KPAE/KBLI TERMINALS. SUNDAY MORNING...RAIN OR SNOW MIX ACROSS THE AREA COULD TURN BACK TO A PERIOD OF SNOW WITH ACCUMULATION POSSIBLE. IT IS IMPOSSIBLE TO SAY AT THIS TIME WHERE AND HOW MUCH...THOUGH THE BEST CHANCE WILL BE NORTH OF SEATTLE. IFR CONDS POSSIBLE. A CHANGE TO RAIN IS EVENTUALLY EXPECTED FROM SOUTH TO NORTH BY MIDDAY. AT KSEA...LIGHT NE WINDS THIS MORNING...COMING AROUND TO ELY THEN SELY BY LATE AFTERNOON. FLURRIES THIS MORNING...WITH STEADIER SNOW LIKELY TO DEVELOP BTWN 22-24Z. ACCUMULATIONS OF A TRACE TO TWO INCHES ARE EXPECTED...MAINLY BETWEEN 00Z-04Z SAT EVENING. SNOW WILL LIKELY MIX WITH RAIN BEGINNING 04Z-06Z AND CONTINUE AS A MIX INTO SUNDAY MORNING. THERE IS A SLIGHT PROBABILITY...PERHAPS 20 PERCENT...THAT PRECIP COULD REMAIN SNOW OVERNIGHT INTO SUNDAY MORNING WITH SOME HIGHER SNOW ACCUMULATIONS. CONTINUE TO MONITOR THE LATEST DISCUSSIONS AND FORECASTS. DTM && .MARINE...LOW PRESSURE OFF THE WA/VANCOUVER ISLAND COASTS WILL GIVE OFFSHORE FLOW THIS MORNING...WEAKENING THIS AFTERNOON AND BECOMING WEAKLY ONSHORE. THIS WILL RESULT IN SMALL CRAFT E/NE WINDS IN THE W ENTRANCE...N INTERIOR...COAST THROUGH THIS EVENING. WILL CALM DOWN SLIGHTLY SATURDAY NIGHT INTO EARLY SUNDAY...BEFORE NEXT SYSTEM BRINGS POSSIBLE GALE FORCE SE WINDS TO THE COAST. A SUB 990MB LOW IS LIKELY TO MOVE THROUGH THE OUTER WATERS IN THE AFTERNOON...AND INLAND WATERS EARLY EVENING. AN EVEN STRONGER SYSTEM WILL BRING STORM FORCE WINDS WITH HIGHER GUSTS ON MONDAY WARRANTING HIGH SURF AND COASTAL FLOODING CONSIDERATIONS. DTM && .SEW WATCHES/WARNINGS/ADVISORIES... .SMALL CRAFT ADVISORY N INLAND WATERS...W ENTRANCE TO THE STRAIT...AND COAST THROUGH THIS EVENING. .SMALL CRAFT ADVISORY GRAYS HARBOR BAR FOR ROUGH BAR CONDITIONS. .WINTER STORM WARNING CASCADES AND OLYMPICS. .SNOW ADVISORY FOR ALL THE LOWLANDS EXCEPT THE EASTERN STRAIT OF JUAN DE FUCA. WEATHER.GOV/SEATTLE
3 heavy snow. Local standard time, as filed.
Up to 8 inches of snow fell. Highway 3 was littered with vehicles stuck in the ditches or on the median. One road in south Kitsap county had to be closed.
Heavy snow fell, averaging at least 4 inches with some 13 inch amounts.
Another batch of heavy snow fell. Average amount at least 6 inches.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2007Every state in 2007This day in weather historyWarnings in Washington, 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: 72330, 111133, 111132.