Blizzard Warning 28, NWS Anchorage, AK

326 
WWAK41 PAFC 211817
WSWAER

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE ANCHORAGE AK
917 AM AKST TUE DEC 21 2010

AKZ131-211930-
/X.CAN.PAFC.WC.Y.0012.000000T0000Z-101221T1900Z/
NORTHEAST PRINCE WILLIAM SOUND-
INCLUDING THE CITIES OF...VALDEZ...THOMPSON PASS
917 AM AKST TUE DEC 21 2010

...WIND CHILL ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN ANCHORAGE HAS CANCELLED THE WIND
CHILL ADVISORY. 


$$

AKZ171-220900-
/X.CON.PAFC.BZ.W.0028.101221T2200Z-101222T1400Z/
KODIAK ISLAND-
INCLUDING THE CITY OF...KODIAK CITY
917 AM AKST TUE DEC 21 2010

...BLIZZARD WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO
5 AM AKST WEDNESDAY...

A BLIZZARD WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO
5 AM AKST WEDNESDAY. 

A STRENGTHENING LOW IN THE GULF OF ALASKA WILL INCREASE WINDS AND
BRING SNOW TO KODIAK ISLAND THIS AFTERNOON THROUGH TONIGHT. SNOW
SHOULD BECOME STEADY AROUND NOON AND NORTH TO NORTHWEST WINDS
WILL INCREASE TO 30 TO 45 MPH THIS AFTERNOON. THIS COMBINATION
WILL CAUSE BLOWING SNOW THAT IS EXPECTED TO REDUCE VISIBILITIES
TO ONE QUARTER MILE AT TIMES. THESE CONDITIONS WILL PERSIST
THROUGH THE NIGHT AND THEN IMPROVE EARLY WEDNESDAY MORNING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BLIZZARD WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
EXPECTED OR OCCURRING. FALLING AND BLOWING SNOW WITH STRONG WINDS
AND POOR VISIBILITIES ARE LIKELY. THIS WILL LEAD TO WHITE-OUT
CONDITIONS...MAKING TRAVEL EXTREMELY DANGEROUS. ALL TRAVEL AND
OUTDOOR ACTIVITY IS STRONGLY DISCOURAGED.

&&

$$

691 
WWAK41 PAFC 220055
WSWAER

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE ANCHORAGE AK
355 PM AKST TUE DEC 21 2010

AKZ171-221400-
/X.CON.PAFC.BZ.W.0028.000000T0000Z-101222T1400Z/
KODIAK ISLAND-
INCLUDING THE CITY OF...KODIAK CITY
355 PM AKST TUE DEC 21 2010

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 AM AKST WEDNESDAY...

A BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 AM AKST WEDNESDAY. 

A STRENGTHENING LOW IN THE GULF OF ALASKA WILL INCREASE WINDS AND
BRING SNOW TO KODIAK ISLAND THIS AFTERNOON THROUGH TONIGHT. SNOW
SHOULD BECOME STEADY AROUND NOON AND NORTH TO NORTHWEST WINDS
WILL INCREASE TO 30 TO 45 MPH THIS AFTERNOON. THIS COMBINATION
WILL CAUSE BLOWING SNOW THAT IS EXPECTED TO REDUCE VISIBILITIES
TO ONE QUARTER MILE AT TIMES. THESE CONDITIONS WILL PERSIST
THROUGH THE NIGHT AND THEN IMPROVE EARLY WEDNESDAY MORNING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BLIZZARD WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
EXPECTED OR OCCURRING. FALLING AND BLOWING SNOW WITH STRONG WINDS
AND POOR VISIBILITIES ARE LIKELY. THIS WILL LEAD TO WHITE-OUT
CONDITIONS...MAKING TRAVEL EXTREMELY DANGEROUS. ALL TRAVEL AND
OUTDOOR ACTIVITY IS STRONGLY DISCOURAGED.

&&

$$

AKZ145-221400-
/X.NEW.PAFC.WC.Y.0013.101222T0900Z-101222T2100Z/
SUSITNA VALLEY-
INCLUDING THE CITIES OF...TALKEETNA...WILLOW...CANTWELL
355 PM AKST TUE DEC 21 2010

...WIND CHILL ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO NOON
AKST WEDNESDAY TOWARDS THE PARK...

THE NATIONAL WEATHER SERVICE IN ANCHORAGE HAS ISSUED A WIND CHILL
ADVISORY...WHICH IS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON AKST
WEDNESDAY TOWARDS THE PARK.

AN ARCTIC AIR MASS WITH TEMPERATURES OF 20 BELOW TO 25 BELOW HAS
SETTLED INTO PLACE TOWARDS THE PARK NEAR CANTWELL. NORTHERLY WINDS 5
TO 10 MPH THIS EVENING WILL BEGIN TO INCREASE TO 25 TO 40 MPH
AFTER MIDNIGHT. THE COMBINATION OF STRONG WINDS AND COLD
TEMPERATURES WILL COMBINE TO PRODUCE WIND CHILLS BETWEEN 30 BELOW
AND 45 BELOW AFTER MIDNIGHT THROUGH LATE MORNING WEDNESDAY.

TEMPERATURES SHOULD MODERATE TO NEAR ZERO TOWARDS THE PARK BY EARLY
AFTERNOON AND INCREASE WIND CHILLS ABOVE ADVISORY CRITERIA.
HOWEVER...THE POTENTIAL DOES EXIST FOR WIND CHILLS TO AGAIN DROP
BELOW ADVISORY CRITERIA WEDNESDAY NIGHT THROUGH THURSDAY MORNING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND CHILL ADVISORY MEANS THAT VERY COLD AIR AND STRONG WINDS
WILL COMBINE TO GENERATE LOW WIND CHILLS. THIS WILL RESULT IN
FROSTBITE AND LEAD TO HYPOTHERMIA IF PRECAUTIONS ARE NOT TAKEN.

&&

$$

210 
WWAK41 PAFC 220133
WSWAER

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE ANCHORAGE AK
433 PM AKST TUE DEC 21 2010

AKZ171-221400-
/X.CON.PAFC.BZ.W.0028.000000T0000Z-101222T1400Z/
KODIAK ISLAND-
INCLUDING THE CITY OF...KODIAK CITY
433 PM AKST TUE DEC 21 2010

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 AM AKST WEDNESDAY...

A BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 AM AKST WEDNESDAY. 

A LOW PRESSURE SYSTEM IS CONTINUING TO PRODUCE SNOW AND STRONG
WINDS ACROSS THE REGION. THIS SNOW COMBINED WITH NORTH TO
NORTHWEST WINDS OF 30 TO 45 MPH WILL CONTINUE TO PRODUCE
WIDESPREAD AREAS OF BLOWING SNOW. VISIBILITIES WILL BE REDUCED TO
ONE QUARTER MILE OR LESS AT TIMES THROUGH LATE TONIGHT IN SNOW AND
BLOWING SNOW.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BLIZZARD WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
EXPECTED OR OCCURRING. FALLING AND BLOWING SNOW WITH STRONG WINDS
AND POOR VISIBILITIES ARE LIKELY. THIS WILL LEAD TO WHITE-OUT
CONDITIONS...MAKING TRAVEL EXTREMELY DANGEROUS. ALL TRAVEL AND
OUTDOOR ACTIVITY IS STRONGLY DISCOURAGED.

&&

$$

AKZ131-221445-
/X.EXB.PAFC.WC.Y.0013.101222T0133Z-101222T2100Z/
NORTHEAST PRINCE WILLIAM SOUND-
INCLUDING THE CITIES OF...VALDEZ...THOMPSON PASS
433 PM AKST TUE DEC 21 2010

...WIND CHILL ADVISORY IN EFFECT UNTIL NOON AKST WEDNESDAY THROUGH
THOMPSON PASS...

THE NATIONAL WEATHER SERVICE IN ANCHORAGE HAS ISSUED A WIND CHILL
ADVISORY...WHICH IS IN EFFECT UNTIL NOON AKST WEDNESDAY THROUGH
THOMPSON PASS.

TEMPERATURES OF 5 BELOW TO 15 BELOW WILL COMBINE WITH NORTHEAST
WINDS OF 30 TO 45 MPH TO PRODUCE WIND CHILLS OF 30 BELOW TO 45
BELOW THROUGH LATE WEDNESDAY MORNING. 

TEMPERATURES SHOULD MODERATE BY MIDDAY WEDNESDAY...WHICH SHOULD RAISE
WIND CHILLS ABOVE ADVISORY CRITERIA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND CHILL ADVISORY MEANS THAT VERY COLD AIR AND STRONG WINDS
WILL COMBINE TO GENERATE LOW WIND CHILLS. THIS WILL RESULT IN
FROSTBITE AND LEAD TO HYPOTHERMIA IF PRECAUTIONS ARE NOT TAKEN.

&&

$$

AKZ145-221445-
/X.CON.PAFC.WC.Y.0013.101222T0900Z-101222T2100Z/
SUSITNA VALLEY-
INCLUDING THE CITIES OF...TALKEETNA...WILLOW...CANTWELL
433 PM AKST TUE DEC 21 2010

...WIND CHILL ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO
NOON AKST WEDNESDAY TOWARDS THE PARK...

A WIND CHILL ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO
NOON AKST WEDNESDAY TOWARDS THE PARK.

AN ARCTIC AIR MASS WITH TEMPERATURES OF 20 BELOW TO 25 BELOW HAS
SETTLED INTO PLACE TOWARDS THE PARK NEAR CANTWELL. NORTHERLY
WINDS 5 TO 10 MPH THIS EVENING WILL BEGIN TO INCREASE TO 25 TO
40 MPH AFTER MIDNIGHT. THE COMBINATION OF STRONG WINDS AND COLD
TEMPERATURES WILL COMBINE TO PRODUCE WIND CHILLS BETWEEN 30 BELOW
AND 45 BELOW AFTER MIDNIGHT THROUGH LATE MORNING WEDNESDAY.

TEMPERATURES SHOULD MODERATE TO NEAR ZERO TOWARDS THE PARK BY
EARLY AFTERNOON AND INCREASE WIND CHILLS ABOVE ADVISORY CRITERIA.
HOWEVER...THE POTENTIAL DOES EXIST FOR WIND CHILLS TO AGAIN DROP
BELOW ADVISORY CRITERIA WEDNESDAY NIGHT THROUGH THURSDAY MORNING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND CHILL ADVISORY MEANS THAT VERY COLD AIR AND STRONG WINDS
WILL COMBINE TO GENERATE LOW WIND CHILLS. THIS WILL RESULT IN
FROSTBITE AND LEAD TO HYPOTHERMIA IF PRECAUTIONS ARE NOT TAKEN.

&&

$$

646 
WWAK41 PAFC 221352
WSWAER

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE ANCHORAGE AK
452 AM AKST WED DEC 22 2010

AKZ171-221500-
/X.EXP.PAFC.BZ.W.0028.000000T0000Z-101222T1400Z/
KODIAK ISLAND-
INCLUDING THE CITY OF...KODIAK CITY
452 AM AKST WED DEC 22 2010

...BLIZZARD WARNING WILL EXPIRE AT 5 AM AKST EARLY THIS MORNING...

THE BLIZZARD WARNING WILL EXPIRE AT 5 AM AKST EARLY THIS MORNING.

SNOW HAS ENDED ACROSS KODIAK ISLAND AND SKIES ARE BEGINNING TO
CLEAR. STRONG WINDS WILL CONTINUE FOR THE NEXT COUPLE DAYS.

$$

AKZ131-230300-
/X.EXT.PAFC.WC.Y.0013.000000T0000Z-101223T2100Z/
NORTHEAST PRINCE WILLIAM SOUND-
INCLUDING THE CITIES OF...VALDEZ...THOMPSON PASS
452 AM AKST WED DEC 22 2010

...WIND CHILL ADVISORY NOW IN EFFECT UNTIL NOON AKST THURSDAY
FOR THOMPSON PASS...

THE WIND CHILL ADVISORY IS NOW IN EFFECT UNTIL NOON AKST THURSDAY.

TEMPERATURES OF 5 BELOW TO 15 BELOW WILL COMBINE WITH NORTHEAST
WINDS OF 40 TO 60 MPH TO PRODUCE WIND CHILLS OF 30 BELOW TO
45 BELOW THROUGH LATE THURSDAY MORNING. TEMPERATURES ARE EXPECTED
TO BEGIN TO SLOWLY MODERATE BY THURSDAY AFTERNOON WHILE WINDS 
DIMINISH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND CHILL ADVISORY MEANS THAT VERY COLD AIR AND STRONG WINDS
WILL COMBINE TO GENERATE LOW WIND CHILLS. THIS WILL RESULT IN
FROSTBITE AND LEAD TO HYPOTHERMIA IF PRECAUTIONS ARE NOT TAKEN.

&&

$$

AKZ145-222100-
/X.CON.PAFC.WC.Y.0013.000000T0000Z-101222T2100Z/
SUSITNA VALLEY-
INCLUDING THE CITIES OF...TALKEETNA...WILLOW...CANTWELL
452 AM AKST WED DEC 22 2010

...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL NOON AKST TODAY
TOWARD THE PARK...

A WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL NOON AKST TODAY. 

NORTHERLY WINDS OF 20 TO 35 MPH WITH GUSTS TO 55 MPH WILL COMBINE
WITH SUB-ZERO TEMPERATURES TO PRODUCE WIND CHILLS BETWEEN 30
BELOW AND 45 BELOW TOWARD THE PARK THIS MORNING. THE LOWEST WIND
CHILLS WILL BE FOUND IN THE BROAD PASS AREA. TEMPERATURES WILL
MODERATE BY THIS AFTERNOON WHILE WINDS WILL REMAIN STRONG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND CHILL ADVISORY MEANS THAT VERY COLD AIR AND STRONG WINDS
WILL COMBINE TO GENERATE LOW WIND CHILLS. THIS WILL RESULT IN
FROSTBITE AND LEAD TO HYPOTHERMIA IF PRECAUTIONS ARE NOT TAKEN.

&&

$$

SOUTHCENTRAL AND SOUTHWEST ALASKA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ANCHORAGE AK
500 AM AKST TUE DEC 21 2010

.MODEL DISCUSSION...
MODELS IN GOOD AGREEMENT THROUGH 120 HOURS. NAM PREFERRED EAST OF
170W DUE TO SUPERIOR HANDLING OF DETAIL. GFS PREFERRED OUT WEST DUE
TO BETTER RUN TO RUN CONSISTENCY.

.UPPER LEVELS...
UPPER LEVELS RELATIVELY FLAT AT PRESENT BUT EXPECTED TO DEVELOP INTO
A HIGH AMPLITUDE PATTERN OVER THE NEXT 36 HOURS. LOW CENTER OVER
NORTHWESTERN GULF SLIDES SOUTHWARD TO NEAR 50N 140W BY WED
AFTERNOON. RIDGE OF HIGH PRESSURE BUILDS OVER WESTERN ALEUTIANS AND
CENTRAL BERING SEA.

.ANALYSIS AND SHORT TERM FORECAST...
A 990 MB LOW SOUTH OF MIDDLETON ISLAND WILL MOVE TO SOUTHEAST OF
KODIAK ISLAND TONIGHT THEN DISSIPATE BY LATE TOMORROW MORNING.
SCATTERED SNOW SHOWERS MOVING EAST TO WEST ALONG THE GULF COAST WILL
INTERMITTENTLY REDUCE CEILINGS AND VISIBILITIES FROM CORDOVA TO
WHITTIER TO KODIAK TODAY...BUT MOST OF SOUTHCENTRAL ALASKA WILL
CONTINUE TO EXPERIENCE MOSTLY CLEAR SKIES. NORTHERLY GAP WINDS OF 30
TO 45 MPH THROUGH CHANNELED AREAS OF THE CHUGACH MOUNTAINS AND
ALEUTIAN RANGE ARE EXPECTED TO PERSIST THROUGH AT LEAST WEDNESDAY
NIGHT.
A 1006 MB LOW NORTH OF THE CENTRAL ALEUTIANS WILL PASS OVER THE
EASTERN ALEUTIANS TODAY AND DISSIPATE IN THE NORTH PACIFIC THIS
EVENING. ASSOCIATED OCCLUDED FRONT EXTENDS FROM THE SOUTHWESTERN
BERING AND THROUGH THE ALASKA PENINSULA. FRONT IS MOVING SLOWLY
EASTWARD AS IT DISSIPATES. SNOW AND RAIN SHOWERS ALONG THE FRONT
SHOULD TAPER OFF BY LATE TOMORROW MORNING.
PRESSURE GRADIENT ALONG THE ALASKA PENINSULA AND EASTERN BERING
TIGHTENS THROUGH 36 HOURS. GUSTS 45 TO 65 DEVELOPING THROUGH BAYS
AND PASSES TONIGHT AND CONTINUING THROUGH THURSDAY MORNING.
AT KODIAK...COLD AIR ADVECTING IN FROM THE NORTHWEST IN THE MID AND
UPPER LEVELS AND SNOW SHOWERS MOVING IN FROM THE EAST IN THE LOWER
LEVELS WILL COMBINE TO PRODUCE BLIZZARD OR NEAR BLIZZARD CONDITIONS
AS EARLY AS LATE THIS AFTERNOON.

.LONG TERM FORECAST...
COMPLEX LOW PRESSURE PERSISTS SOUTH OF GULF OF ALASKA. COLD AND
WINDY CONDITIONS WILL PREVAIL ACROSS SOUTHCENTRAL AND SOUTHWESTERN
ALASKA INTO THE WEEKEND.HIGH PRESSURE OVER THE ALEUTIANS AND
SOUTHERN BERING HOLDS THROUGH WEDNESDAY NIGHT THEN GIVES WAY ON
THURSDAY AS A LOW PRESSURE SYSTEM MOVES IN FROM THE WEST ON
THURSDAY.

.AER/ALU...WATCH/WARNING SUMMARY
PUBLIC...BLIZZARD 171
MARINE...GALE 120 121 129 130 132 155 160 165 170 171 172 180
              351 352 413 414
         STORM 150
         HEAVY SPRAY 121 129 140 141 150 160 165 180 185 414
FIRE WEATHER...NONE.

ASB DEC 10