Wind Chill Advisory 12, NWS Anchorage, AK

065 
WWAK41 PAFC 291359
WSWAER

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE ANCHORAGE AK
459 AM AKST SUN JAN 29 2012

AKZ131-292100-
/X.CON.PAFC.WC.Y.0012.000000T0000Z-120129T2100Z/
NORTHEAST PRINCE WILLIAM SOUND-
INCLUDING THE CITIES OF...VALDEZ...THOMPSON PASS
459 AM AKST SUN JAN 29 2012

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

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

* LOCATION...THOMPSON PASS.

* WIND CHILL VALUES...35 BELOW TO 50 BELOW ZERO

* WIND...NORTH WIND 30 TO 45 MPH.

* TIMING...WINDS WILL SLOWLY DECREASE THROUGH TODAY AS
  TEMPERATURES WARM A BIT A LITTLE THIS AFTERNOON. WIND CHILL
  VALUES WILL WARM TO ABOVE ADVISORY LEVEL BY MIDDAY.

* IMPACTS...INCREASED RISK OF HYPOTHERMIA AND FROSTBITE.

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.

&&

$$

575 
WWAK41 PAFC 292052
WSWAER

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE ANCHORAGE AK
1152 AM AKST SUN JAN 29 2012

AKZ131-300100-
/X.EXT.PAFC.WC.Y.0012.000000T0000Z-120130T0100Z/
NORTHEAST PRINCE WILLIAM SOUND-
INCLUDING THE CITIES OF...VALDEZ...THOMPSON PASS
1152 AM AKST SUN JAN 29 2012

...WIND CHILL ADVISORY NOW IN EFFECT UNTIL 4 PM AKST THIS
AFTERNOON THROUGH THOMPSON PASS...

THE WIND CHILL ADVISORY IS NOW IN EFFECT UNTIL 4 PM AKST THIS
AFTERNOON. 

* LOCATION...THOMPSON PASS.

* WIND CHILL VALUES...35 BELOW TO 45 BELOW ZERO

* WIND...NORTH WIND 25 TO 35 MPH.

* TIMING...WINDS WILL SLOWLY DIMINISH THIS AFTERNOON WHILE
  TEMPERATURES REMAIN STEADY OR SLOWLY RISE.

* IMPACTS...INCREASED RISK OF HYPOTHERMIA AND FROSTBITE.

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.

&&

$$

404 
WWAK41 PAFC 300101
WSWAER

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE ANCHORAGE AK
401 PM AKST SUN JAN 29 2012

AKZ131-300215-
/X.EXP.PAFC.WC.Y.0012.000000T0000Z-120130T0100Z/
NORTHEAST PRINCE WILLIAM SOUND-
INCLUDING THE CITIES OF...VALDEZ...THOMPSON PASS
401 PM AKST SUN JAN 29 2012

...WIND CHILL ADVISORY HAS EXPIRED THROUGH THOMPSON PASS...

THE WIND CHILL ADVISORY IS NO LONGER IN EFFECT. 

$$

SOUTHCENTRAL AND SOUTHWEST ALASKA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ANCHORAGE AK
200 PM AKST SAT JAN 28 2012

.ANALYSIS AND UPPER LEVELS...
VERY NASTY WEATHER ACROSS THE STATE WITH HEAVY SNOW IN THE
SOUTHEAST...BRUTAL COLD TEMPERATURES AND WIND CHILLS OVER THE
INTERIOR AND SOUTHWEST...AND BLIZZARD CONDITIONS OVER PORTIONS OF THE
AKPEN AND ALEUTIANS. THIS ALL STEMS FROM A PERSISTENT COLD AIRMASS
THAT REFUSES TO BUDGE OVER THE INTERIOR. THE CURRENT STORM TRACK IS
TAKING DEVELOPING LOW PRESSURE SYSTEMS SOUTH OF THE MAINLAND...EITHER
ALONG THE ALEUTIAN CHAIN OR TOWARD THE PANHANDLE.

A LARGE ANCHOR LOW IS POSITIONED SOUTH OF THE WESTERN ALEUTIANS WITH
THE ASSOCIATED FRONTAL BOUNDARY EXTENDING TOWARD THE ALASKA
PENINSULA. BLIZZARD CONDITIONS CAN BE FOUND ALL ALONG THIS FRONTAL
BOUNDARY WITH WINDS IN EXCESS OF 60 MPH AT THE PRIBILOF ISLANDS AND
ZERO VISIBILITY. HIGH PRESSURE OVER THE INTERIOR COUPLED WITH THE
APPROACHING FRONTAL BOUNDARY IS RESULTING IN A MODERATE PRESSURE
GRADIENT. THIS PRESSURE GRADIENT IS ACCELERATING THE WINDS WHICH
COUPLED WITH THE EXTREMELY COLD AIRMASS IS PRODUCING DANGEROUS WIND
CHILLS. THE KUSKOKWIM DELTA IN PARTICULAR IS EXPERIENCING VERY HARSH
CONDITIONS WITH -65 WIND CHILL AT TIMES.

.MODEL DISCUSSION...
THE MODELS ARE IN EXCELLENT AGREEMENT AND CONTINUE TO BE CONSISTENT
FROM RUN TO RUN. ONLY MINOR CHANGES WILL BE MADE WITH THE UPCOMING
FORECAST PACKAGE THIS AFTERNOON.

.SHORT TERM FORECAST...
.SOUTHCENTRAL ALASKA AND THE GULF...THE MOST TAME WEATHER ACROSS THE
STATE CAN BE FOUND OVER SOUTHCENTRAL ALASKA WHERE COLD TEMPERATURES
PREVAIL BUT ONLY A FEW ISOLATED AREAS ARE EXPERIENCING THE EXTREME
COLD OR LOCAL GUSTY WINDS. THE REMNANTS OF THE FRONTAL BOUNDARY NEAR
THE ALASKA PENINSULA WILL HEAD TOWARD SOUTHCENTRAL ALASKA TONIGHT. AN
UPPER LEVEL RIDGE WILL AMPLIFY AHEAD OF THIS FEATURE TRAPPING THE
COLD AIR FOR ONE MORE NIGHT. SOUTHCENTRAL COULD SEE THE COLDEST
TEMPERATURES OF THE SEASON TONIGHT ALTHOUGH CLOUDS INVADING WILL
LIKELY HINDER SOME LOCATIONS FROM BOTTOMING OUT.

PRECIPITATION WILL INITIALLY BE LIMITED TO THE COAST UNTIL A TRIPLE
POINT LOW DEVELOPS NEAR KODIAK LATE SUNDAY NIGHT. OVERRUNNING
MOISTURE WILL EVENTUALLY SPREAD OVER SOUTHCENTRAL ALASKA BRINGING
LIGHT SNOW TO MOST OF THE REGION.

WILL NEED TO KEEP AN EYE ON THE PRECIP TYPE FOR KODIAK SUNDAY NIGHT
AS ANY RAIN COULD LEAD TO FLOODING BECAUSE OF THE FROZEN GROUND AND
MUCH HIGHER THAN NORMAL SNOW PACK.

.SOUTHWEST ALASKA AND THE BERING SEA...
THE CONCERN FOR SOUTHWEST ALASKA WILL CONTINUE TO BE THE VERY COLD
AIR AND DANGEROUS WIND CHILLS. THE AFOREMENTIONED FRONT WILL NOT MAKE
TOO MUCH PROGRESS INLAND. SOME LIGHT SNOW WILL SPREAD OVER BRISTOL
BAY WITH LOCAL GUSTY WINDS RESULTING LOCALLY REDUCED VISIBILITY IN
BLOWING SNOW. AT THIS TIME...DO NOT BELIEVE THE WINDS WILL BE STRONG
ENOUGH OR SNOW TO BE INTENSE ENOUGH TO WARRANT ANY WARNINGS OR
ADVISORIES. WHILE TEMPERATURES MODERATE SLIGHTLY WITH THIS
SYSTEM...COLDER AIR WILL RETURN EARLY THIS WEEK.

.BERING SEA/ALEUTIANS...
THE MOST ACTIVE WEATHER IN OUR DOMAIN WILL CONTINUE OUT WEST.
BLIZZARD CONDITIONS ALONG THE ALASKA PENINSULA AND PRIBILOF ISLANDS
WILL SUBSIDE THIS EVENING AS THE FRONT WEAKENS AND MOVES NORTH. THE
WESTERN ALEUTIANS MAY CONTINUE TO SEE BLIZZARD CONDITIONS AT TIMES AS
THE MOISTURE WRAPS AROUND THE BACK SIDE OF THE LOW AND CONTINUES TO
FEED SHOWERS ACROSS THE ISLANDS.

AS THE LOW OCCLUDES AND BEGINS TO WEAKEN...SEVERAL SMALL LOWS WILL
DEVELOP ASSOCIATED WITH UPPER LEVEL DISTURBANCES. THESE SMALLER LOWS
WILL BE DIFFICULT TO TIME AS THEY RAPIDLY SPIN UP AND MOVE ALONG THE
CHAIN. OVERALL...RELATIVELY BENIGN CONDITIONS WILL RETURN TO THE
BERING SEA BY MID WEEK WITH COLD AIR SHOWERS PREVAILING.

.AER/ALU...WATCH/WARNING SUMMARY
PUBLIC...BLIZZARD WARNING 181 195
         WIND CHILL WARNING 155
MARINE...GALES 175 176 179 185
FIRE WEATHER...NONE.

AB JAN 12