Gale Warning 312, NWS Anchorage, AK

371 
FZAK62 PAFC 101155
OFFALU

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 AM AKDT SUN APR 10 2011

OFFSHORE WATERS FORECAST FOR THE BERING SEA

WIND FORECASTS REFLECT THE PREDOMINANT SPEED AND DIRECTION
EXPECTED. SEA FORECASTS REPRESENT AN AVERAGE OF THE HIGHEST
ONE-THIRD OF THE COMBINED WIND WAVE AND SWELL HEIGHT.

PKZ499-110300-
400 AM AKDT SUN APR 10 2011
.SYNOPSIS FOR CENTRAL BERING SEA...

A BROAD TROUGH OF LOW PRESSURE ACROSS THE BERING MOVES ACROSS THE
EASTERN ALEUTIANS AND AK PENINSULA INTO THE NORTHERN PACIFIC SUN
AFTERNOON. HIGH PRESSURE THEN BUILDS OVER THE CENTRAL BERING AND
ALEUTIANS THROUGH MON NIGHT.

$$

PKZ411-110300-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE
400 AM AKDT SUN APR 10 2011

.TODAY...N WIND 30 KT DIMINISHING TO 20 KT IN THE AFTERNOON. SEAS
16 FT. FREEZING SPRAY N OF 57N. 
.TONIGHT...N WIND 15 KT BECOMING SW 20 KT AFTER MIDNIGHT. SEAS 11 FT.
.MON...S WIND 25 KT. SEAS 8 FT. RAIN AND SNOW. 
.MON NIGHT...S WIND 20 KT. SEAS 7 FT. 
.TUE...SW WIND 20 KT. SEAS 8 FT. 
.WED AND THU...S WIND 25 KT. SEAS 11 FT.   

$$

PKZ412-110300-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N
400 AM AKDT SUN APR 10 2011

...HEAVY FREEZING SPRAY WARNING THROUGH TONIGHT...

.TODAY...N WIND 20 KT. SEAS 12 FT. HEAVY FREEZING SPRAY NEAR THE ICE
EDGE. 
.TONIGHT...NW WIND 20 KT. SEAS 12 FT. HEAVY FREEZING SPRAY NEAR THE
ICE EDGE. 
.MON...NW WIND 20 KT. SEAS 9 FT. FREEZING SPRAY. 
.MON NIGHT...W WIND 20 KT. SEAS 7 FT. 
.TUE...W WIND 15 KT. SEAS 6 FT. 
.WED AND THU...VARIABLE WIND 10 KT. SEAS 5 FT.   

$$

PKZ413-110300-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N
400 AM AKDT SUN APR 10 2011

.TODAY...W WIND 20 TO 30 KT BECOMING NW IN THE AFTERNOON. SEAS 12 TO
16 FT. 
.TONIGHT...N WIND 25 KT. SEAS 13 FT. FREEZING SPRAY E OF 176W. 
.MON...NW WIND 20 KT. SEAS 11 FT. FREEZING SPRAY E OF 176W. 
.MON NIGHT...W WIND 20 KT. SEAS 7 FT. 
.TUE...W WIND 15 KT. SEAS 6 FT. 
.WED...VARIABLE WIND 10 KT. SEAS 4 FT. 
.THU...W WIND 15 KT. SEAS 4 FT.  

$$

PKZ414-110300-
BERING SEA OFFSHORE EAST OF 171W
400 AM AKDT SUN APR 10 2011

...HEAVY FREEZING SPRAY WARNING THROUGH MONDAY...

.TODAY...W WIND 25 KT BECOMING N IN THE AFTERNOON. SEAS IN ICE FREE
WATERS 10 FT. SNOW AND RAIN SHOWERS. HEAVY FREEZING SPRAY NEAR THE
ICE EDGE. 
.TONIGHT...NW WIND 25 KT. SEAS IN ICE FREE WATERS 12 FT. HEAVY
FREEZING SPRAY N OF 56N. 
.MON...NW WIND 30 KT. SEAS IN ICE FREE WATERS 11 FT. HEAVY FREEZING
SPRAY N OF 56N. 
.MON NIGHT AND TUE...NW WIND 30 KT. SEAS IN ICE FREE WATERS 9 FT.  
.WED...N WIND 25 KT. SEAS IN ICE FREE WATERS 5 FT. 
.THU...N WIND 20 KT. SEAS IN ICE FREE WATERS 5 FT.  

$$

SOUTHCENTRAL AND SOUTHWEST ALASKA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 PM AKDT SAT APR 9 2011

.MODEL DISCUSSION...MODELS CONTINUE TO BE IN GOOD AGREEMENT WELL INTO
NEXT WEEK. THERE REMAINS SOME DEBATE TO THE STRUCTURE TO THE COMPLEX
LOW IN THE GULF OF ALASKA BUT THIS IS NORMALLY THE CASE AND IT WILL
HAVE LITTLE IMPACT ON THE FORECASTS.

.ANALYSIS AND UPPER LEVELS...THE UPPER LEVEL PATTERN HAS BECOME MORE
PROGRESSIVE WITH A MILD WEST TO EAST JET RUNNING OVER THE ALEUTIANS
AND THEN SOUTH OF THE GULF OF ALASKA. A BROAD UPPER LEVEL TROUGH
REMAINS OVER MAINLAND ALASKA WITH ANOTHER WEAK WAVE OVER THE
NORTHWEST BERING SEA.
THERE IS ALSO AN UPPER LEVEL SHORT WAVE MOVING ACROSS THE ALASKA
PENINSULA AND HEADING TOWARD THE KODIAK AREA.
AT THE SURFACE A COMPLEX AREA OF LOW PRESSURE IS OVER THE GULF OF
ALASKA AND WILL PERSIST FOR A FEW DAYS WHILE TWO LOWS IN THE BERING
SEA WILL MOVE RAPIDLY EASTWARD AND DISSIPATE.
AS THE WEEK PROGRESSES A HIGH WILL AMPLIFY IN THE BERING SEA AND UP
THE WESTERN ALASKA COAST WITH THE COMPLEX LOW REMAINING IN THE GULF
OF ALASKA.

.SHORT TERM FORECAST...
THE AIR ALOFT OVER MAINLAND ALASKA IS STILL RELATIVELY COLD AND
BREAKS IN THE CLOUDS ARE STARTING TO WARM UP THE LAND...ESPECIALLY
WHERE SNOW HAS MELTED. THIS WILL CAUSE MORE GENERALLY UNSTABLE
CONDITIONS OVER THE AREA. FROM THE CHUGACH AND TALKEETNA MOUNTAINS
EASTWARD THERE COULD BE SOME AFTERNOON AND EVENING SHOWERS THAT
DEVELOP THE NEXT FEW DAYS IN THIS PATTERN. THEY WILL MOSTLY BE OVER
THE MOUNTAINS.
THE UPPER LEVEL WAVE OVER THE ALASKA PENINSULA WILL MOVE SOUTHEAST
AND CUT OFF THE SNOW IN EASTERN BRISTOL BAY THIS EVENING.

.LONG TERM FORECAST...THE LARGE BUT RELATIVELY WEAK LOW WILL PERSIST
IN THE GULF OF ALASKA THROUGH THE END OF NEXT WEEK AS THE PROGRESSIVE
PATTERN OF THE LAST FEW DAYS COMES TO AN END. HIGH PRESSURE WILL
BRING MORE SETTLED CONDITIONS TO THE ALEUTIANS AND BERING SEA THROUGH
MOST OF NEXT WEEK. EXPECT SEASONABLE TEMPERATURES...WITH MANY PARTS
OF MAINLAND ALASKA LIKELY SEEING SIGNIFICANT AMOUNTS OF SUNSHINE BY
MIDWEEK.

.AER/ALU...WATCH/WARNING SUMMARY
PUBLIC...NONE.
MARINE...GALE 150 172 175 176.
         HEAVY FREEZING SPRAY 179 185.
FIRE WEATHER...NONE.

APR 11