Alert archive / Washington / Winter Storm Warnings in 2012

Winter Storm Warning 20, NWS Seattle, WA

December 1, 2012

NWS Seattle, WA issued this winter storm warning at Dec 1, 2012, 4:03 AM PST. It took effect at Dec 1, 2012, 2:59 PM PST. It was in force for 27 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Dec 1, 2012, 4:03 AM PST (12:03 UTC)
In effect from
Dec 1, 2012, 2:59 PM PST
Expired
Dec 2, 2012, 6:00 PM PST
In force
27 hr
Issued by
NWS Seattle, WA

The text

As transmitted, in the capitals the NWS used until 2016.

530 
WWUS46 KSEW 011203
WSWSEW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
403 AM PST SAT DEC 1 2012

...A VERY ACTIVE WEATHER PATTERN WILL BRING WINTER WEATHER TO THE
MOUNTAINS THROUGH THE UPCOMING WEEKEND...

.WEATHER SYSTEMS ROTATING AROUND A LARGE LOW PRESSURE SYSTEM WELL
OFFSHORE WILL BRING HEAVY PRECIPITATION AT TIMES TO THE MOUNTAINS
THROUGH THE WEEKEND. A STRONG UPPER LEVEL TROUGH WILL MOVE
ACROSS THE AREA TONIGHT AND SUNDAY. SNOW LEVELS WILL REMAIN
BETWEEN 3500 AND 4500 FEET.



WAZ513-012000-
/O.CAN.KSEW.WW.Y.0038.000000T0000Z-121201T2000Z/
/O.UPG.KSEW.WS.A.0016.121202T0900Z-121203T0900Z/
/O.NEW.KSEW.WS.W.0020.121201T2000Z-121202T2000Z/
/O.NEW.KSEW.WW.Y.0039.121201T1203Z-121201T2000Z/
OLYMPICS-
403 AM PST SAT DEC 1 2012

...WINTER WEATHER ADVISORY IN EFFECT UNTIL NOON PST TODAY...
...WINTER STORM WARNING IN EFFECT FROM NOON TODAY TO NOON PST
SUNDAY...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WINTER STORM
WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM NOON TODAY TO NOON
PST SUNDAY. A WINTER WEATHER ADVISORY FOR SNOW REMAINS IN EFFECT UNTIL
NOON TODAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT.

* SOME AFFECTED LOCATIONS...HURRICANE RIDGE.

* TIMING...SNOW SHOWERS WILL CONTINUE OVER THE OLYMPICS
  TODAY...BECOMING HEAVY AT TIMES THIS AFTERNOON. MORE STEADY AND
  OCCASIONALLY SNOW WILL DEVELOP LATE THIS EVENING AND CONTINUE
  EARLY SUNDAY MORNING. 

* SNOW ACCUMULATIONS...4 TO 13 INCHES ENDING EARLY SUNDAY MORNING.

* MAIN IMPACT...SLIPPERY ROADWAYS AND POOR VISIBILITIES.

* SNOW LEVEL...NEAR 4500 FEET TODAY...LOWERING TO 4000 FEET
  TONIGHT AND 3500 FEET ON SUNDAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW IS ISSUED WHEN 6 TO 11 INCHES
IS LIKELY TO FALL IN 12 HOURS.

A WINTER STORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE
WINTER WEATHER. IF YOU MUST TRAVEL IN THE WATCH AREA...CARRY AN
EXTRA FLASHLIGHT...FOOD...WATER...AND BLANKETS IN CASE OF
EMERGENCY.

&&

$$

WAZ518-012000-
/O.UPG.KSEW.WS.A.0016.121202T0900Z-121203T0900Z/
/O.NEW.KSEW.WS.W.0020.121201T2000Z-121202T2000Z/
/O.CON.KSEW.WW.Y.0038.000000T0000Z-121201T2000Z/
WEST SLOPES NORTHERN CASCADES AND PASSES-
403 AM PST SAT DEC 1 2012

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON PST
TODAY...
...WINTER STORM WARNING IN EFFECT FROM NOON TODAY TO NOON PST
SUNDAY...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WINTER STORM
WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM NOON TODAY TO
NOON PST SUNDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT.

* SOME AFFECTED LOCATIONS...MOUNT BAKER.

* TIMING...SNOW SHOWERS WILL CONTINUE TODAY BUT MAY BE HEAVY AT
  TIMES THIS AFTERNOON. ANOTHER PERIOD OF SNOW MORE WIDESPREAD AND
  OCCASIONALLY HEAVY SNOW IS LIKELY LATE TONIGHT THROUGH SUNDAY
  MORNING.

* SNOW ACCUMULATIONS...11 TO 25 INCHES THROUGH SUNDAY AFTERNOON. 

* MAIN IMPACT...SLIPPERY ROADWAYS AND POOR VISIBILITIES.

* SNOW LEVEL...4000 FEET TODAY AND TONIGHT...LOWERING TO 3500 FEET
  SUNDAY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW IS ISSUED WHEN 6 TO 11 INCHES
IS LIKELY TO FALL IN 12 HOURS.

A WINTER STORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE
WINTER WEATHER. IF YOU MUST TRAVEL IN THE WATCH AREA...CARRY AN
EXTRA FLASHLIGHT...FOOD...WATER...AND BLANKETS IN CASE OF
EMERGENCY.

&&

$$

WAZ519-012000-
/O.EXT.KSEW.WS.A.0016.121202T0900Z-121203T0200Z/
/O.CON.KSEW.WW.Y.0038.000000T0000Z-121201T2000Z/
WEST SLOPES CENTRAL CASCADES AND PASSES-
403 AM PST SAT DEC 1 2012

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON PST
TODAY...
...WINTER STORM WATCH NOW IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

* SOME AFFECTED LOCATIONS...STEVENS PASS...SNOQUALMIE PASS... 
  MOUNT RAINIER NATIONAL PARK. 

* TIMING...SNOW SHOWERS WILL CONTINUE TODAY. ANOTHER PERIOD OF
  POSSIBLY HEAVY SNOW IS LIKELY LATE TONIGHT THROUGH SUNDAY
  AFTERNOON.

* SNOW ACCUMULATIONS...5 TO 16 INCHES THROUGH SUNDAY AFTERNOON. 

* MAIN IMPACT...SLIPPERY ROADWAYS AND POOR VISIBILITIES.

* SNOW LEVEL...NEAR 4000 FEET TODAY THROUGH SUNDAY
  MORNING...LOWERING TO 3000 FEET SUNDAY AFTERNOON. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW IS ISSUED WHEN 6 TO 11 INCHES
IS LIKELY TO FALL IN 12 HOURS.

A WINTER STORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE
WINTER WEATHER. IF YOU MUST TRAVEL IN THE WATCH AREA...CARRY AN
EXTRA FLASHLIGHT...FOOD...WATER...AND BLANKETS IN CASE OF
EMERGENCY.

&&

$$
7 follow-up statements
675 
WWUS46 KSEW 011212 CCA
WSWSEW

URGENT - WINTER WEATHER MESSAGE...CORRECTED
NATIONAL WEATHER SERVICE SEATTLE WA
410 AM PST SAT DEC 1 2012

...A VERY ACTIVE WEATHER PATTERN WILL BRING WINTER WEATHER TO THE
MOUNTAINS THROUGH THE UPCOMING WEEKEND...

.WEATHER SYSTEMS ROTATING AROUND A LARGE LOW PRESSURE SYSTEM WELL
OFFSHORE WILL BRING HEAVY PRECIPITATION AT TIMES TO THE MOUNTAINS
THROUGH THE WEEKEND. A STRONG UPPER LEVEL TROUGH WILL MOVE
ACROSS THE AREA TONIGHT AND SUNDAY. SNOW LEVELS WILL REMAIN
BETWEEN 3500 AND 4500 FEET.



WAZ513-012015-
/O.CAN.KSEW.WW.Y.0038.000000T0000Z-121201T2000Z/
/O.UPG.KSEW.WS.A.0016.121202T0900Z-121203T0900Z/
/O.COR.KSEW.WS.W.0020.121201T2000Z-121202T2000Z/
/O.COR.KSEW.WW.Y.0039.121201T1210Z-121201T2000Z/
OLYMPICS-
410 AM PST SAT DEC 1 2012

...WINTER WEATHER ADVISORY IN EFFECT UNTIL NOON PST TODAY...
...WINTER STORM WARNING IN EFFECT FROM NOON TODAY TO NOON PST
SUNDAY...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WINTER STORM
WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM NOON TODAY TO NOON
PST SUNDAY. A WINTER WEATHER ADVISORY FOR SNOW REMAINS IN EFFECT UNTIL
NOON TODAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT.

* SOME AFFECTED LOCATIONS...HURRICANE RIDGE.

* TIMING...SNOW SHOWERS WILL CONTINUE OVER THE OLYMPICS
  TODAY...BECOMING HEAVY AT TIMES THIS AFTERNOON. MORE STEADY AND
  OCCASIONALLY SNOW WILL DEVELOP LATE THIS EVENING AND CONTINUE
  EARLY SUNDAY MORNING. 

* SNOW ACCUMULATIONS...4 TO 13 INCHES ENDING EARLY SUNDAY MORNING.

* MAIN IMPACT...SLIPPERY ROADWAYS AND POOR VISIBILITIES.

* SNOW LEVEL...NEAR 4500 FEET TODAY...LOWERING TO 4000 FEET
  TONIGHT AND 3500 FEET ON SUNDAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW IS ISSUED WHEN 6 TO 11 INCHES
IS LIKELY TO FALL IN 12 HOURS.

A WINTER STORM WARNING FOR SNOW IS ISSUED WHEN 12 OR MORE INCHES
IS LIKELY TO FALL IN 12 HOURS...OR 18 INCHES OR MORE IN 24 HOURS. 
THE WARNING MEANS CONDITIONS ARE FAVORABLE FOR SEVERE WINTER
WEATHER. IF YOU MUST TRAVEL IN THE WATCH AREA...CARRY AN EXTRA
FLASHLIGHT...FOOD...WATER...AND BLANKETS IN CASE OF EMERGENCY.

&&

$$

WAZ518-012015-
/O.UPG.KSEW.WS.A.0016.121202T0900Z-121203T0900Z/
/O.COR.KSEW.WS.W.0020.121201T2000Z-121202T2000Z/
/O.COR.KSEW.WW.Y.0038.000000T0000Z-121201T2000Z/
WEST SLOPES NORTHERN CASCADES AND PASSES-
410 AM PST SAT DEC 1 2012

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON PST
TODAY...
...WINTER STORM WARNING IN EFFECT FROM NOON TODAY TO NOON PST
SUNDAY...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WINTER STORM
WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM NOON TODAY TO
NOON PST SUNDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT.

* SOME AFFECTED LOCATIONS...MOUNT BAKER.

* TIMING...SNOW SHOWERS WILL CONTINUE TODAY BUT MAY BE HEAVY AT
  TIMES THIS AFTERNOON. ANOTHER PERIOD OF SNOW MORE WIDESPREAD AND
  OCCASIONALLY HEAVY SNOW IS LIKELY LATE TONIGHT THROUGH SUNDAY
  MORNING.

* SNOW ACCUMULATIONS...11 TO 25 INCHES THROUGH SUNDAY AFTERNOON. 

* MAIN IMPACT...SLIPPERY ROADWAYS AND POOR VISIBILITIES.

* SNOW LEVEL...4000 FEET TODAY AND TONIGHT...LOWERING TO 3500 FEET
  SUNDAY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW IS ISSUED WHEN 6 TO 11 INCHES
IS LIKELY TO FALL IN 12 HOURS.

A WINTER STORM WARNING FOR SNOW IS ISSUED WHEN 12 OR MORE INCHES
IS LIKELY TO FALL IN 12 HOURS...OR 18 INCHES OR MORE IN 24 HOURS. 
THE WARNING MEANS CONDITIONS ARE FAVORABLE FOR SEVERE WINTER
WEATHER. IF YOU MUST TRAVEL IN THE WATCH AREA...CARRY AN EXTRA
FLASHLIGHT...FOOD...WATER...AND BLANKETS IN CASE OF EMERGENCY.

&&

$$

WAZ519-012015-
/O.EXT.KSEW.WS.A.0016.121202T0900Z-121203T0200Z/
/O.CON.KSEW.WW.Y.0038.000000T0000Z-121201T2000Z/
WEST SLOPES CENTRAL CASCADES AND PASSES-
410 AM PST SAT DEC 1 2012

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON PST
TODAY...
...WINTER STORM WATCH NOW IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

* SOME AFFECTED LOCATIONS...STEVENS PASS...SNOQUALMIE PASS... 
  MOUNT RAINIER NATIONAL PARK. 

* TIMING...SNOW SHOWERS WILL CONTINUE TODAY. ANOTHER PERIOD OF
  POSSIBLY HEAVY SNOW IS LIKELY LATE TONIGHT THROUGH SUNDAY
  AFTERNOON.

* SNOW ACCUMULATIONS...5 TO 16 INCHES THROUGH SUNDAY AFTERNOON. 

* MAIN IMPACT...SLIPPERY ROADWAYS AND POOR VISIBILITIES.

* SNOW LEVEL...NEAR 4000 FEET TODAY THROUGH SUNDAY
  MORNING...LOWERING TO 3000 FEET SUNDAY AFTERNOON. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW IS ISSUED WHEN 6 TO 11 INCHES
IS LIKELY TO FALL IN 12 HOURS.

A WINTER STORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE
WINTER WEATHER. IF YOU MUST TRAVEL IN THE WATCH AREA...CARRY AN
EXTRA FLASHLIGHT...FOOD...WATER...AND BLANKETS IN CASE OF
EMERGENCY.

&&

$$
460 
WWUS46 KSEW 011748
WSWSEW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
948 AM PST SAT DEC 1 2012

WAZ513-020200-
/O.EXT.KSEW.WS.W.0020.121202T0200Z-121202T2000Z/
/O.EXT.KSEW.WW.Y.0039.000000T0000Z-121202T0200Z/
OLYMPICS-
948 AM PST SAT DEC 1 2012

...WINTER WEATHER ADVISORY IN EFFECT FOR THE OLYMPICS ABOVE 3500
FEET UNTIL 6 PM PST THIS EVENING...
...WINTER STORM WARNING NOW IN EFFECT FOR THE OLYMPICS ABOVE 3500
FEET FROM 6 PM THIS EVENING TO NOON PST SUNDAY...

* SOME AFFECTED LOCATIONS...HURRICANE RIDGE.

* TIMING...SHOWERS WILL CONTINUE THROUGHOUT THE DAY...WITH THE
  SHOWERS BECOMING HEAVY AT TIMES THIS AFTERNOON. STEADY SNOW...
  LOCALLY HEAVY...WILL OCCUR TONIGHT BEFORE TAPERING OFF TO
  SHOWERS SUNDAY MORNING.

* SNOW ACCUMULATIONS...10 TO 14 INCHES ARE LIKELY BY SUNDAY
  MORNING. 

* MAIN IMPACT...WINTER DRIVING CONDITIONS CAN BE EXPECTED ON
  HURRICANE RIDGE ROAD AT TIMES TODAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW IS ISSUED WHEN 6 TO 11 INCHES
IS LIKELY TO FALL IN 12 HOURS.

A WINTER STORM WARNING FOR SNOW IS ISSUED WHEN 12 OR MORE INCHES
IS LIKELY TO FALL IN 12 HOURS...OR 18 INCHES OR MORE IN 24 HOURS.
THE WARNING MEANS CONDITIONS ARE FAVORABLE FOR SEVERE WINTER
WEATHER. IF YOU MUST TRAVEL IN THE WATCH AREA...CARRY AN EXTRA
FLASHLIGHT...FOOD...WATER...AND BLANKETS IN CASE OF EMERGENCY.

FOR HURRICANE RIDGE ROAD CONDITIONS...CALL 360-565-3131.

&&

$$

WAZ518-020200-
/O.EXT.KSEW.WS.W.0020.121202T0200Z-121202T2000Z/
/O.EXT.KSEW.WW.Y.0038.000000T0000Z-121202T0200Z/
WEST SLOPES NORTHERN CASCADES AND PASSES-
948 AM PST SAT DEC 1 2012

...WINTER WEATHER ADVISORY IN EFFECT FOR THE NORTH CASCADES ABOVE
3500 FEET UNTIL 6 PM PST THIS EVENING...
...WINTER STORM WARNING NOW IN EFFECT FOR THE NORTH CASCADES ABOVE
3500 FEET FROM 6 PM THIS EVENING TO NOON PST SUNDAY...

* SOME AFFECTED LOCATIONS...MOUNT BAKER.

* TIMING...SHOWERS WILL CONTINUE THROUGHOUT THE DAY...WITH THE
  SHOWERS BECOMING HEAVY AT TIMES THIS AFTERNOON. STEADY SNOW...
  LOCALLY HEAVY...WILL OCCUR TONIGHT BEFORE TAPERING OFF TO
  SHOWERS SUNDAY MORNING.

* SNOW ACCUMULATIONS...12 TO 18 INCHES OF NEW SNOW BY MIDDAY
  SUNDAY.

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES CAN
  BE EXPECTED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THOSE PLANNING TRAVEL IN THE NORTH CASCADES SHOULD BE PREPARED
FOR HAZARDOUS...WINTER DRIVING CONDITIONS ABOVE THE 3500 FOOT
LEVEL.

FOR ROAD CONDITIONS OR TRAVEL ALERTS...CALL 5-1-1 OR
1-800-695-7623...OR VISIT WWW.WSDOT.WA.GOV.

&&

$$

WAZ519-020200-
/O.EXT.KSEW.WW.Y.0038.000000T0000Z-121202T0200Z/
/O.CON.KSEW.WS.A.0016.121202T0900Z-121203T0200Z/
WEST SLOPES CENTRAL CASCADES AND PASSES-
948 AM PST SAT DEC 1 2012

...WINTER WEATHER ADVISORY IN EFFECT FOR THE CENTRAL CASCADES
ABOVE 4000 FEET UNTIL 6 PM PST THIS EVENING...
...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
SUNDAY AFTERNOON...

* SOME AFFECTED LOCATIONS...PARADISE...WHITE PASS...AND STEVENS
  PASS.

* TIMING...THE PERIOD OF HEAVIEST SNOW WILL LIKELY OCCUR TONIGHT.
  THERE IS A SLIGHT CHANCE OF THUNDERSTORMS THIS AFTERNOON. IF A
  THUNDERSTORM DOES DEVELOP...IT WILL LIKELY PRODUCE A BRIEF BURST
  OF HEAVY SNOW.

* SNOW ACCUMULATIONS...8 TO 12 INCHES OF NEW SNOW BY MIDDAY
  SUNDAY. THE HEAVIEST SNOW IS EXPECTED ON THE SOUTH SLOPES OF
  MOUNT RAINIER.

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES CAN
  BE EXPECTED IN THE HIGHER PASSES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY FOR SNOW IS ISSUED WHEN 6 TO 11 INCHES
IS LIKELY TO FALL IN 12 HOURS.

A WINTER STORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE
WINTER WEATHER. IF YOU MUST TRAVEL IN THE WATCH AREA...CARRY AN
EXTRA FLASHLIGHT...FOOD...WATER...AND BLANKETS IN CASE OF
EMERGENCY.

&&

$$

WWW.WEATHER.GOV/SEATTLE
125 
WWUS46 KSEW 012259
WSWSEW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
259 PM PST SAT DEC 1 2012

WAZ513-020700-
/O.CAN.KSEW.WW.Y.0039.000000T0000Z-121202T0200Z/
/O.EXT.KSEW.WS.W.0020.121201T2259Z-121202T2000Z/
OLYMPICS-
259 PM PST SAT DEC 1 2012

...WINTER STORM WARNING IN EFFECT FOR THE OLYMPICS ABOVE 3000 FEET
UNTIL NOON PST SUNDAY...
...WINTER WEATHER ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS CANCELLED THE WINTER
WEATHER ADVISORY. 

* SOME AFFECTED LOCATIONS...HURRICANE RIDGE.

* TIMING...SNOW WILL BECOME HEAVY AT TIMES TONIGHT BEFORE TAPERING
  OFF TO SHOWERS SUNDAY MORNING.

* SNOW ACCUMULATIONS...8 TO 13 INCHES OF NEW SNOW IS LIKELY BY
  MIDDAY SUNDAY.

* MAIN IMPACT...WINTER DRIVING CONDITIONS CAN BE EXPECTED ON
  HURRICANE RIDGE ROAD AT TIMES ON SUNDAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING MEANS SEVERE WINTER WEATHER IS OCCURRING OR
IMMINENT.

FOR HURRICANE RIDGE ROAD CONDITIONS...CALL 360-565-3131.

&&

$$

WAZ518-020700-
/O.CAN.KSEW.WW.Y.0038.000000T0000Z-121202T0200Z/
/O.EXT.KSEW.WS.W.0020.121201T2259Z-121203T0200Z/
WEST SLOPES NORTHERN CASCADES AND PASSES-
259 PM PST SAT DEC 1 2012

...WINTER STORM WARNING IN EFFECT FOR THE NORTH CASCADES ABOVE
3000 FEET UNTIL 6 PM PST SUNDAY...
...WINTER WEATHER ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS CANCELLED THE WINTER
WEATHER ADVISORY. 

* SOME AFFECTED LOCATIONS...MOUNT BAKER.

* TIMING...SNOW WILL INCREASE AND BECOME LOCALLY HEAVY TONIGHT AND
  WILL PERSIST THROUGHOUT THE DAY SUNDAY.

* SNOW ACCUMULATIONS...1 TO 2 FEET OF NEW SNOW IS LIKELY BY LATE
  IN THE DAY SUNDAY. 

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES 
  CAN BE EXPECTED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THOSE PLANNING TRAVEL IN THE NORTH CASCADES SHOULD BE PREPARED
FOR HAZARDOUS...WINTER DRIVING CONDITIONS ABOVE THE 3000 FOOT
LEVEL.

&&

$$

WAZ519-020700-
/O.CAN.KSEW.WS.A.0016.121202T0900Z-121203T0200Z/
/O.EXT.KSEW.WW.Y.0038.000000T0000Z-121203T0200Z/
WEST SLOPES CENTRAL CASCADES AND PASSES-
259 PM PST SAT DEC 1 2012

...WINTER WEATHER ADVISORY IN EFFECT FOR THE CENTRAL CASCADES
ABOVE 3000 FEET UNTIL 6 PM PST SUNDAY...
...WINTER STORM WATCH IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS CANCELLED THE WINTER
STORM WATCH. 

* SOME AFFECTED LOCATIONS...PARADISE...WHITE PASS...SNOQUALMIE
  PASS AND STEVENS PASS.

* TIMING...SNOW WILL INCREASE LATE TONIGHT ACROSS THE AREA AND
  CONTINUE DURING THE DAY SUNDAY.

* SNOW ACCUMULATIONS...9 TO 18 INCHES OF SNOW IS LIKELY BY LATE IN
  THE DAY SUNDAY...WITH THE HEAVIEST AMOUNTS FALLING ON MOUNT
  RAINIER. 

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES 
  CAN BE EXPECTED IN THE PASSES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY IS ISSUED FOR A VARIETY OF WINTER WEATHER
CONDITIONS SUCH AS FREEZING RAIN AND SNOW OCCURRING AT THE SAME
TIME. WHILE THE WEATHER WILL BE SIGNIFICANT...THE WORD ADVISORY
MEANS THAT LIFE THREATENING WINTER WEATHER IS NOT EXPECTED.

FOR ROAD CONDITIONS OR TRAVEL ALERTS...CALL 5-1-1 OR
1-800-695-7623...OR VISIT WWW.WSDOT.WA.GOV.

&&

$$

WWW.WEATHER.GOV/SEATTLE
550 
WWUS46 KSEW 020523
WSWSEW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
923 PM PST SAT DEC 1 2012

WAZ513-021400-
/O.CON.KSEW.WS.W.0020.000000T0000Z-121202T2000Z/
OLYMPICS-
923 PM PST SAT DEC 1 2012

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON PST SUNDAY...

* SOME AFFECTED LOCATIONS...HURRICANE RIDGE.

* TIMING...SNOW WILL BECOME HEAVY AT TIMES TONIGHT BEFORE 
  TAPERING OFF TO SHOWERS SUNDAY MORNING. 

* SNOW ACCUMULATIONS...8 TO 13 INCHES OF NEW SNOW IS LIKELY BY 
  MIDDAY SUNDAY. 

* MAIN IMPACT...WINTER DRIVING CONDITIONS CAN BE EXPECTED ON 
  HURRICANE RIDGE ROAD AT TIMES ON SUNDAY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING MEANS SEVERE WINTER WEATHER IS OCCURRING
OR IMMINENT.

FOR HURRICANE RIDGE ROAD CONDITIONS...CALL 360-565-3131.

&&

$$

WAZ518-021400-
/O.CON.KSEW.WS.W.0020.000000T0000Z-121203T0200Z/
WEST SLOPES NORTHERN CASCADES AND PASSES-
923 PM PST SAT DEC 1 2012

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM PST SUNDAY...

* SOME AFFECTED LOCATIONS...MOUNT BAKER.

* TIMING...SNOW WILL INCREASE AND BECOME LOCALLY HEAVY TONIGHT 
  AND WILL PERSIST THROUGHOUT THE DAY SUNDAY. 

* SNOW ACCUMULATIONS...1 TO 2 FEET OF NEW SNOW IS LIKELY BY LATE 
  IN THE DAY SUNDAY. 

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES 
  CAN BE EXPECTED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THOSE PLANNING TRAVEL IN THE NORTH CASCADES SHOULD BE PREPARED
FOR HAZARDOUS...WINTER DRIVING CONDITIONS ABOVE THE 3000 FOOT
LEVEL.

&&

$$

WAZ519-021400-
/O.CON.KSEW.WW.Y.0038.000000T0000Z-121203T0200Z/
WEST SLOPES CENTRAL CASCADES AND PASSES-
923 PM PST SAT DEC 1 2012

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM PST
SUNDAY...

* SOME AFFECTED LOCATIONS...PARADISE...WHITE PASS...SNOQUALMIE 
  PASS AND STEVENS PASS. 

* TIMING...SNOW WILL INCREASE LATE TONIGHT ACROSS THE AREA AND 
  CONTINUE DURING THE DAY SUNDAY. 

* SNOW ACCUMULATIONS...9 TO 18 INCHES OF SNOW IS LIKELY BY LATE 
  IN THE DAY SUNDAY...WITH THE HEAVIEST AMOUNTS FALLING ON MOUNT 
  RAINIER. 

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES 
  CAN BE EXPECTED IN THE PASSES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY IS ISSUED FOR A VARIETY OF WINTER
WEATHER CONDITIONS SUCH AS FREEZING RAIN AND SNOW OCCURRING AT
THE SAME TIME. WHILE THE WEATHER WILL BE SIGNIFICANT...THE WORD
ADVISORY MEANS THAT LIFE THREATENING WINTER WEATHER IS NOT
EXPECTED.

FOR ROAD CONDITIONS OR TRAVEL ALERTS...CALL 5-1-1 OR 1-800-695-
7623...OR VISIT WWW.WSDOT.WA.GOV.

&&

$$
761 
WWUS46 KSEW 021214
WSWSEW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
414 AM PST SUN DEC 2 2012

WAZ513-022000-
/O.CON.KSEW.WS.W.0020.000000T0000Z-121202T2000Z/
OLYMPICS-
414 AM PST SUN DEC 2 2012

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON PST TODAY...

* SOME AFFECTED LOCATIONS...HURRICANE RIDGE.

* TIMING...SNOW WILL BE HEAVY AT TIMES EARLY THIS MORNING BEFORE
  DIMINISHING BY MID MORNING. SHOWERS WILL CONTINUE THIS AFTERNOON
  THROUGH MONDAY.

* SNOW ACCUMULATIONS...1 TO 3 INCHES OF ADDITIONAL SNOW MAY FALL
  THIS MORNING...WITH 8 TO 13 INCHES OF TOTAL NEW SNOW.

* MAIN IMPACT...WINTER DRIVING CONDITIONS CAN BE EXPECTED ON 
  HURRICANE RIDGE ROAD AT TIMES ON SUNDAY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING MEANS SEVERE WINTER WEATHER IS OCCURRING
OR IMMINENT.

FOR HURRICANE RIDGE ROAD CONDITIONS...CALL 360-565-3131.

&&

$$

WAZ518-022015-
/O.CON.KSEW.WS.W.0020.000000T0000Z-121203T0200Z/
WEST SLOPES NORTHERN CASCADES AND PASSES-
414 AM PST SUN DEC 2 2012

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM PST THIS
EVENING...

* SOME AFFECTED LOCATIONS...MOUNT BAKER.

* TIMING...SNOW WILL CONTINUE HEAVY AT TIMES THIS MORNING...BEFORE
  DIMINISHING TO SHOWERS THIS AFTERNOON. SHOWERS MAY PRODUCE BRIEF
  LOCALLY HEAVY SNOW THIS AFTERNOON.

* SNOW ACCUMULATIONS...ANOTHER 3 TO 7 INCHES OF NEW SNOW WILL FALL
  BY LATE IN THE DAY. TOTAL ACCUMULATION FROM THIS STORM WILL BE
  ONE TO 2 FEET. 

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES 
  CAN BE EXPECTED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THOSE PLANNING TRAVEL IN THE NORTH CASCADES SHOULD BE PREPARED
FOR HAZARDOUS...WINTER DRIVING CONDITIONS ABOVE THE 3000 FOOT
LEVEL.

&&

$$

WAZ519-022015-
/O.CON.KSEW.WW.Y.0038.000000T0000Z-121203T0200Z/
WEST SLOPES CENTRAL CASCADES AND PASSES-
414 AM PST SUN DEC 2 2012

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM PST THIS
EVENING...

* SOME AFFECTED LOCATIONS...PARADISE...WHITE PASS...SNOQUALMIE 
  PASS AND STEVENS PASS. 

* TIMING...SNOW WILL CONTINUE THIS MORNING THEN CHANGE TO SNOW
  SHOWERS THIS AFTERNOON. LOCALLY BRIEF HEAVY SNOW IS POSSIBLE TODAY.

* SNOW ACCUMULATIONS...3 TO 8 INCHES OF NEW SNOW MAY FALL TODAY
  WITH THE HEAVIEST AMOUNTS EXPECTED ON MOUNT RAINIER. TOTAL STORM
  ACCUMULATIONS MAY BE IN THE 9 TO 18 INCH RANGE. 

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES 
  CAN BE EXPECTED IN THE PASSES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY IS ISSUED FOR A VARIETY OF WINTER
WEATHER CONDITIONS SUCH AS FREEZING RAIN AND SNOW OCCURRING AT
THE SAME TIME. WHILE THE WEATHER WILL BE SIGNIFICANT...THE WORD
ADVISORY MEANS THAT LIFE THREATENING WINTER WEATHER IS NOT
EXPECTED.

FOR ROAD CONDITIONS OR TRAVEL ALERTS...CALL 5-1-1 OR 1-800-695-
7623...OR VISIT WWW.WSDOT.WA.GOV.

&&

$$
049 
WWUS46 KSEW 022008
WSWSEW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
1208 PM PST SUN DEC 2 2012

WAZ513-022115-
/O.EXP.KSEW.WS.W.0020.000000T0000Z-121202T2000Z/
OLYMPICS-
1208 PM PST SUN DEC 2 2012

...WINTER STORM WARNING HAS EXPIRED...

STEADY SNOW HAS TAPERED TO SCATTERED SHOWERS.

$$

WAZ518-030600-
/O.EXB.KSEW.WW.Y.0038.121203T0200Z-121203T1800Z/
/O.CON.KSEW.WS.W.0020.000000T0000Z-121203T0200Z/
WEST SLOPES NORTHERN CASCADES AND PASSES-
1208 PM PST SUN DEC 2 2012

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM PST THIS
EVENING...
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
10 AM PST MONDAY...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WINTER
WEATHER ADVISORY FOR SNOW ABOVE 3000 FEE...WHICH IS IN EFFECT
FROM 6 PM THIS EVENING TO 10 AM PST MONDAY.

* SOME AFFECTED LOCATIONS...MOUNT BAKER.

* TIMING...SNOW SHOWERS WILL CONTINUE THROUGH MONDAY MORNING.
  LOCALLY BRIEF HEAVY SNOW IS POSSIBLE TODAY.

* SNOW ACCUMULATIONS...3 TO 8 INCHES OF NEW SNOW MAY FALL TODAY
  WITH THE HEAVIEST AMOUNTS EXPECTED ON MOUNT BAKER. AN ADDITIONAL
  6 TO 12 INCHES IS POSSIBLE TONIGHT AND MONDAY MORNING AS SNOW
  SHOWER CONTINUE. SNOW SHOWERS ARE EXPECTED TO DECREASE LATE
  MONDAY MORNING.

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES 
  CAN BE EXPECTED IN THE PASSES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY IS ISSUED FOR A VARIETY OF WINTER
WEATHER CONDITIONS SUCH AS FREEZING RAIN AND SNOW OCCURRING AT
THE SAME TIME. WHILE THE WEATHER WILL BE SIGNIFICANT...THE WORD
ADVISORY MEANS THAT LIFE THREATENING WINTER WEATHER IS NOT
EXPECTED.

FOR ROAD CONDITIONS OR TRAVEL ALERTS...CALL 5-1-1 OR 1-800-695-
7623...OR VISIT WWW.WSDOT.WA.GOV.

&&

$$

WAZ519-030600-
/O.EXT.KSEW.WW.Y.0038.000000T0000Z-121203T1800Z/
WEST SLOPES CENTRAL CASCADES AND PASSES-
1208 PM PST SUN DEC 2 2012

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 10 AM PST MONDAY...

* SOME AFFECTED LOCATIONS...PARADISE...WHITE PASS...SNOQUALMIE 
  PASS AND STEVENS PASS. 

* TIMING...SNOW SHOWERS WILL CONTINUE THROUGH MONDAY MORNING.

* SNOW ACCUMULATIONS...3 TO 6 INCHES OF NEW SNOW MAY FALL TODAY
  WITH THE HEAVIEST AMOUNTS EXPECTED ON MOUNT RAINIER. AN
  ADDITIONAL 6 TO 12 INCHES IS POSSIBLE TONIGHT AND MONDAY
  MORNING. SNOW SHOWERS ARE EXPECTED TO DECREASE LATE MONDAY
  MORNING.

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES 
  CAN BE EXPECTED IN THE PASSES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY IS ISSUED FOR A VARIETY OF WINTER
WEATHER CONDITIONS SUCH AS FREEZING RAIN AND SNOW OCCURRING AT
THE SAME TIME. WHILE THE WEATHER WILL BE SIGNIFICANT...THE WORD
ADVISORY MEANS THAT LIFE THREATENING WINTER WEATHER IS NOT
EXPECTED.

FOR ROAD CONDITIONS OR TRAVEL ALERTS...CALL 5-1-1 OR 1-800-695-
7623...OR VISIT WWW.WSDOT.WA.GOV.

&&

$$
667 
WWUS46 KSEW 022012 CCA
WSWSEW

URGENT - WINTER WEATHER MESSAGE...CORRECTED
NATIONAL WEATHER SERVICE SEATTLE WA
1210 PM PST SUN DEC 2 2012

WAZ513-022115-
/O.EXP.KSEW.WS.W.0020.000000T0000Z-121202T2000Z/
OLYMPICS-
1210 PM PST SUN DEC 2 2012

...WINTER STORM WARNING HAS EXPIRED...

STEADY SNOW HAS TAPERED TO SCATTERED SHOWERS.

$$

WAZ518-030615-
/O.COR.KSEW.WW.Y.0038.121203T0200Z-121203T1800Z/
/O.COR.KSEW.WS.W.0020.000000T0000Z-121203T0200Z/
WEST SLOPES NORTHERN CASCADES AND PASSES-
1210 PM PST SUN DEC 2 2012

...WINTER STORM WARNING REMAINS IN EFFECT ABOVE 3000 FEET UNTIL 6
PM PST THIS EVENING... 
...WINTER WEATHER ADVISORY IN EFFECT ABOVE 3000 FEET FROM 6 PM
THIS EVENING TO 10 AM PST MONDAY...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WINTER
WEATHER ADVISORY FOR SNOW ABOVE 3000 FEET...WHICH IS IN EFFECT
FROM 6 PM THIS EVENING TO 10 AM PST MONDAY.

* SOME AFFECTED LOCATIONS...MOUNT BAKER.

* TIMING...SNOW SHOWERS WILL CONTINUE THROUGH MONDAY MORNING.
  LOCALLY BRIEF HEAVY SNOW IS POSSIBLE TODAY.

* SNOW ACCUMULATIONS...3 TO 8 INCHES OF NEW SNOW MAY FALL TODAY
  WITH THE HEAVIEST AMOUNTS EXPECTED ON MOUNT BAKER. AN ADDITIONAL
  6 TO 12 INCHES IS POSSIBLE TONIGHT AND MONDAY MORNING AS SNOW
  SHOWER CONTINUE. SNOW SHOWERS ARE EXPECTED TO DECREASE LATE
  MONDAY MORNING.

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES 
  CAN BE EXPECTED IN THE PASSES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY IS ISSUED FOR A VARIETY OF WINTER
WEATHER CONDITIONS SUCH AS FREEZING RAIN AND SNOW OCCURRING AT
THE SAME TIME. WHILE THE WEATHER WILL BE SIGNIFICANT...THE WORD
ADVISORY MEANS THAT LIFE THREATENING WINTER WEATHER IS NOT
EXPECTED.

FOR ROAD CONDITIONS OR TRAVEL ALERTS...CALL 5-1-1 OR 1-800-695-
7623...OR VISIT WWW.WSDOT.WA.GOV.

&&

$$

WAZ519-030615-
/O.COR.KSEW.WW.Y.0038.000000T0000Z-121203T1800Z/
WEST SLOPES CENTRAL CASCADES AND PASSES-
1210 PM PST SUN DEC 2 2012

...WINTER WEATHER ADVISORY NOW IN EFFECT ABOVE 3000 FEET UNTIL 10
AM PST MONDAY...

* SOME AFFECTED LOCATIONS...PARADISE...WHITE PASS...SNOQUALMIE 
  PASS AND STEVENS PASS. 

* TIMING...SNOW SHOWERS WILL CONTINUE THROUGH MONDAY MORNING.

* SNOW ACCUMULATIONS...3 TO 6 INCHES OF NEW SNOW MAY FALL TODAY
  WITH THE HEAVIEST AMOUNTS EXPECTED ON MOUNT RAINIER. AN
  ADDITIONAL 6 TO 12 INCHES IS POSSIBLE TONIGHT AND MONDAY
  MORNING. SNOW SHOWERS ARE EXPECTED TO DECREASE LATE MONDAY
  MORNING.

* MAIN IMPACT...SNOW PACKED ROADS AND POOR VISIBILITY AT TIMES 
  CAN BE EXPECTED IN THE PASSES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY IS ISSUED FOR A VARIETY OF WINTER
WEATHER CONDITIONS SUCH AS FREEZING RAIN AND SNOW OCCURRING AT
THE SAME TIME. WHILE THE WEATHER WILL BE SIGNIFICANT...THE WORD
ADVISORY MEANS THAT LIFE THREATENING WINTER WEATHER IS NOT
EXPECTED.

FOR ROAD CONDITIONS OR TRAVEL ALERTS...CALL 5-1-1 OR 1-800-695-
7623...OR VISIT WWW.WSDOT.WA.GOV.

&&

$$

What forecasters said that day

The local office's own words before this winter storm warning went out, 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 this winter storm warning went out at Dec 1, 3:33 AM PST, 30 minutes earlier.

Area forecast discussion, Dec 1, 3:33 AM PST, 30 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
333 AM PST SAT DEC 1 2012

.SYNOPSIS...POST-FRONTAL SHOWERS WILL MOVE ACROSS WESTERN WASHINGTON
TODAY. A STRONG UPPER LEVEL TROUGH WILL BRING ANOTHER WET AND WINDY
PERIOD TO THE AREA TONIGHT AND SUNDAY. AFTER ANOTHER SHORT PERIOD OF
POST-FRONTAL SHOWERS ON MONDAY...A SECOND STRONG UPPER LEVEL TROUGH
WILL BRING MORE WIND AND RAIN TO THE AREA MONDAY NIGHT AND TUESDAY.
MODERATE WESTERLY FLOW ALOFT WILL MAINTAIN A SHOWERY WEATHER PATTERN
THROUGH LATE NEXT WEEK.

&&

.SHORT TERM...A LARGE UPPER LEVEL LOW OVER THE NE PACIFIC CENTERED
NEAR 49N/135W THIS MORNING WILL DOMINATE THE WEATHER PATTERN OVER W
WA THROUGH THIS WEEKEND. UPPER LEVEL SHORTWAVE TROUGHS OF VARIOUS
STRENGTHS WILL BE SWINGING AROUND THE BASE OF THE LOW AND
NORTHEASTWARD ACROSS W WA.

A STRONG SHORTWAVE TROUGH WAS MOVING THROUGH THE AREA EARLY THIS
MORNING AND RAIN SHOULD DIMINISH BY DAYBREAK. THIS WILL LEAVE W WA
IN A RELATIVE LULL TODAY WITH REGARD TO HEAVIER RAIN...ALTHOUGH
POST-FRONTAL SHOWERS WILL CONTINUE MOVING ACROSS THE AREA. ANOTHER
STRONG SHORTWAVE TROUGH...NEAR 48N/150W AT 09Z...OUT IN THE SW
QUADRANT OF THE OFFSHORE LOW WILL MOVE ACROSS W WA SUNDAY MORNING.
THIS WILL BRING A SHOT OF HEAVY RAIN AND POSSIBLY HEAVY SNOW TO
THE MOUNTAINS LATE TONIGHT AND SUNDAY MORNING. THIS SYSTEM HAS GOOD
UPPER LEVEL SUPPORT WITH A 150 KT JETSTREAK MOVING ACROSS OREGON
JUST BEFORE THE TROUGH AXIS CROSSES W WA. ANOTHER 120 KT JETSTREAK
WILL MOVE ACROSS W WA IN ADVANCE OF THIS TROUGH...LATE THIS
AFTERNOON AND EVENING. THIS WILL RAMP UP THE PRECIP OVER THE
OLYMPICS AND N CASCADES A LITTLE EARLIER.

PERIODS OF HEAVY RAIN OVER THE OLYMPICS TODAY THROUGH SUNDAY MORNING
WILL KEEP THE SKOKOMISH RIVER ABOVE FLOOD STAGE AND DRIVE IT TO A
SECOND CREST ON SUNDAY.

THE PERIODS OF HEAVY PRECIP OVER THE N CASCADES WILL BRING
SIGNIFICANT SNOW TO THE MOUNT BAKER AREA TODAY THROUGH SUNDAY
MORNING. SNOW LEVELS WILL LOWER TO AROUND 4000 FEET TODAY AND
TONIGHT. I WILL UPGRADE THE WINTER STORM WATCH TO A WARNING FOR THE
N CASCADES AND OLYMPICS TO COVER TODAYS SNOW AS WELL AS TONIGHT. THE
CENTRAL CASCADES WHICH WILL NOT RECEIVE QUITE AS MUCH PRECIP WILL BE
LEFT WITH A WINTER STORM WATCH FOR LATE TONIGHT AND SUNDAY MORNING.

SE WINDS WILL INCREASE AHEAD OF THE APPROACHING SYSTEM LATE THIS
AFTERNOON AND THIS EVENING. IT WILL BE WINDY ALONG THE COAST AND N
INTERIOR BUT IT LOOKS LIKE WINDS WILL REMAIN BELOW ADVISORY LEVELS.
A SURFACE TROUGH MOVES ACROSS THE AREA AROUND 12Z LATE TONIGHT...
THEN FAIRLY STRONG S FLOW WILL DEVELOP BEHIND THE SHORTWAVE TROUGH
ON SUNDAY. THIS WILL BRING WINDY CONDITIONS TO MOST OF W WA...WITH
BORDERLINE ADVISORY WINDS A POSSIBILITY.

AFTER THE SECOND STRONG SHORTWAVE TROUGH MOVES INLAND SUNDAY MORNING
THE MAIN UPPER LEVEL LOW WILL HAVE SHIFTED INLAND OVER B.C.  W WA
WILL BE LEFT IN MODERATE WESTERLY FLOW ALOFT...WHICH WILL PRODUCE
SHOWERS OVER THE AREA. KAM

.LONG TERM...ON MONDAY NIGHT AND TUESDAY ANOTHER STRONG WET AND
WINDY UPPER LEVEL TROUGH WILL MOVE ACROSS THE AREA. RECENT MODEL
RUNS HAVE BEEN SHIFTING BETWEEN A MORE PROGRESSIVE PATTERN AND A
ATMOSPHERIC RIVER EVENT WITH MORE SUSTAINED PRECIP. THE LATEST
00Z/06Z GFS IS MORE PROGRESSIVE AND BRINGS ABOUT AN 18 HOUR STRETCH
OF HEAVY RAIN TO THE OLYMPICS AND N CASCADES. GFS/ECMWF PRESSURE
GRADIENTS LOOK STRONG ENOUGH TO KEEP POTENTIAL HIGH WINDS IN MIND.
MODERATE WESTERLY FLOW BEHIND THE TROUGH WILL MAINTAIN SHOWERS
THROUGH WEDNESDAY NIGHT. THE GFS SHOWS A SHORT DRY PERIOD THURSDAY
AND PART OF FRIDAY AS A LOW AMPLITUDE SHORTWAVE RIDGE CROSSES THE
REGION. HOWEVER THE 00Z ECMWF IS WETTER SO NO CHANGES WILL BE MADE
TO THE EXTENDED FORECAST. KAM

&&

.HYDROLOGY...1 TO 5 INCHES OF RAIN FELL OVER THE OLYMPICS OVER THE
PAST 24 HOURS WITH ANOTHER 1 TO 2.7 INCHES OVER THE N CASCADES...AS
A STRONG UPPER LEVEL TROUGH CROSSED THE REGION. RAIN SHOULD DIMINISH
BRIEFLY THIS MORNING AS THE BACK EDGE OF THE TROUGH MOVES EAST OF
THE AREA. THIS HEAVY RAIN WAS ENOUGH TO DRIVE THE SKOKOMISH RIVER
OVER FLOOD STAGE...BUT OTHER AREA RIVERS REMAINED BELOW FLOOD STAGE
DESPITE SOME HAVING SHARP RISES.

A 120 KT JETSTREAK WILL MOVE ACROSS NW WA TODAY WHICH WILL KEEP
PERIODS OF HEAVY RAIN FALLING OVER THE OLYMPICS AND N CASCADES.
AFTER THAT...ANOTHER STRONG UPPER LEVEL TROUGH WILL CROSS W WA EARLY
SATURDAY MORNING WITH MORE HEAVY RAIN TONIGHT THROUGH SUNDAY
MORNING. THE OLYMPICS AND N CASCADES WILL GET ANOTHER 2-3 INCHES IN
THE 36 HOURS ENDING 18Z SUNDAY. THIS WILL KEEP THE SKOKOMISH RIVER
ABOVE FLOOD STAGE AND DRIVE IT BACK UP ON SUNDAY TO ANOTHER CREST.

OTHER RIVERS IN WESTERN WASHINGTON ARE NOT EXPECTED TO REACH FLOOD
STAGE THIS WEEKEND...AS PRECIPITATION AMOUNTS ARE GENERALLY
INSUFFICIENT AND THE SNOW LEVEL WILL BE TOO LOW AT AROUND 4000
FEET.

THE MODELS HAVE BEEN INTERMITTENTLY INDICATING A MORE TYPICAL
ATMOSPHERIC RIVER FLOODING PATTERN FOR MONDAY NIGHT AND EARLY
TUESDAY...BUT THE LATEST 00Z/06Z GFS AND THE 00Z ECMWF ARE MORE
PROGRESSIVE WITH THE SYSTEM WHICH MAY BRING ROUGHLY 18 HOURS OF
HEAVY RAIN TO THE OLYMPICS AND N CASCADES. THIS IS ANOTHER STRONG
UPPER LEVEL TROUGH THAT CROSSES THE REGION...SIMILAR TO THE ONE
EARLY SUNDAY MORNING. KAM

&&

.AVIATION...AREAS OF RAIN EARLY THIS MORNING SHOULD TURN TO
SCATTERED SHOWERS AROUND DAYBREAK...AND THERE IS A GOOD CHANCE OF
SUNBREAKS FINALLY TODAY. THE STRONG SOUTHWESTERLY FLOW ALOFT WILL
CONTINUE. THERE IS STILL A DEEP LOW SURFACE PRESSURE OFFSHORE...BUT
THAT IS DRIFTING SLOWLY NORTH. AIR MASS MOIST AND SLIGHTLY UNSTABLE.
THE MOUNTAINS WILL REMAIN MOSTLY OBSCURED...ALTHOUGH WE MAY SEE THEM
START TO COME OUT THIS AFTERNOON. 19

KSEA...CORRECTED...PERIODS OF RAIN OVERNIGHT WILL TURN TO SCATTERED
SHOWERS BY DAYBREAK. THE WIND WILL INCREASE QUICKLY THIS MORNING AS
SE GRADIENTS TURN MORE TO THE SSW...THE OLM-BLI PRES GRADIENT WAS
ALREADY 2.8MB AT 11Z SO IT MAY HIT +3.5MB IN A FEW HOURS FOR RATHER
BLUSTERY WINDS BY DAYBREAK. 19

&&

.MARINE...THE DEEP LOW PRESSURE CENTER WHICH HAS BEEN JUST OFFSHORE
FOR SEVERAL DAYS WILL MOVE TO HAIDA GWAII TONIGHT...AND IT MAKES IT
CLOSEST APPROACH TO WESTERN WA TODAY AS IT DOES THAT. A ORGANIZED
DISTURBANCE WAS MOVING THROUGH WESTERN WA AROUND 3AM THIS
MORNING...AND THERE IS A BURST OF BLUSTERY SSW WINDS BEHIND THAT.
PRES GRADIENTS WILL WEAKEN TONIGHT...BUT THEN ANOTHER SHORTWAVE AND
LOW PRES SYSTEM WILL DEVELOP AND TRACK THROUGH OREGON LATE TONIGHT.
SO ANOTHER SURGE OF SW WIND WILL DEVELOP SUN MORNING. THE 06Z NAM IS
SIMILAR TO THE ECMWF WITH RELATIVELY LIGHT PRES GRADIENTS
TONIGHT...AN AREA OF 989MB LOW PRESSURE OVER WESTERN WA LATE
TONIGHT...AND THEN MUCH STRONGER GRADIENTS BY 10AM SUNDAY. IN A
NUTSHELL...A BURST OF BLUSTERY WEATHER THIS MORNING AND AGAIN SUN
MORNING.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...COASTAL FLOOD ADVISORY FOR MINOR TIDAL OVERFLOW...THIS IS FOR
      THE BEACHES AND LOW LYING AREAS THROUGHOUT THE INLAND WATERS
      FROM PUGET SOUND TO THE CANADIAN BORDER INCLUDING THE ISLANDS
      AND THE ADMIRALTY INLET/PORT TOWNSEND AREA.

     WINTER WEATHER ADVISORY CASCADES AND OLYMPICS THROUGH THIS
      MORNING.

     WINTER STORM WARNING OLYMPICS AND NORTH CASCADES THIS AFTERNOON
      THROUGH SUNDAY MORNING

     WINTER STORM WATCH CENTRAL CASCADES LATE TONIGHT THROUGH
      SUNDAY EVENING.

PZ...GALE WARNING COASTAL WATERS AND EAST ENTRANCE TO THE STRAIT OF
      JUAN DE FUCA.

     SMALL CRAFT ADVISORY ADMIRALTY INLET...PUGET SOUND AND HOOD
      CANAL...CAMANO ISLAND TO PT ROBERTS.

     SMALL CRAFT ADVISORY FOR ROUGH GRAYS HARBOR BAR.

FOR AN ILLUSTRATED VERSION OF THE FORECAST DISCUSSION...VISIT
WWW.WEATHER.GOV/SEATTLE/GAFD/LATEST_WEBAFD.HTML

The office that day

Everything else NWS Seattle, WA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 30, 8:13 PM PSTGale WarningSEW23 hr
Dec 1, 4:03 AM PSTWinter Weather AdvisorySEW11 hr
Dec 1, 12:20 PM PSTSmall Craft AdvisorySEW50 hr

Nearby

Winter Storm Warnings in Washington, 2012Every winter storm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.