Gale Warning 338, NWS Anchorage, AK

043 
FZAK62 PAFC 232250
OFFALU

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 PM AKDT TUE APR 23 2013

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.

PKZ499-241500-
400 PM AKDT TUE APR 23 2013
.SYNOPSIS FOR CENTRAL BERING SEA...
HIGH PRESSURE WILL REMAIN OVER THE CENTRAL BERING SEA THROUGH THU
AFTERNOON. A WEATHER FRONT OVER THE WESTERN BERING SEA WILL WEAKEN
TONIGHT AND DISSIPATE BY WED AFTERNOON. 

$$

PKZ411-241500-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE
400 PM AKDT TUE APR 23 2013

...GALE WARNING TONIGHT...

.TONIGHT...SE WIND 25 TO 35 KT. SEAS 9 FT. PATCHY FOG. 
.WED...SE WIND 25 KT. SEAS 8 FT. 
.WED NIGHT...E WIND 20 KT. SEAS 8 FT. PATCHY FOG. 
.THU...NE WIND 15 KT. SEAS 6 FT. 
.THU NIGHT AND FRI...NE WIND 20 KT. SEAS 6 FT. 
.SAT AND SUN...E WIND 15 KT. SEAS 5 FT. 

$$

PKZ412-241500-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N
400 PM AKDT TUE APR 23 2013

.TONIGHT...E WIND 20 KT. SEAS 5 FT. 
.WED...E WIND 20 KT. SEAS 6 FT. PATCHY FOG. 
.WED NIGHT...NE WIND 20 KT. SEAS 6 FT. PATCHY FOG.
.THU...NE WIND 15 KT. SEAS 5 FT. 
.THU NIGHT AND FRI...NE WIND 20 KT. SEAS 6 FT. 
.SAT AND SUN...NE WIND 15 KT. SEAS 5 FT.

$$

PKZ413-241500-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N
400 PM AKDT TUE APR 23 2013

.TONIGHT...E WIND 30 KT. SEAS 9 FT. 
.WED AND WED NIGHT...E WIND 20 KT. SEAS 7 FT. PATCHY FOG. 
.THU THROUGH FRI...NE WIND 25 KT. SEAS 8 FT. 
.SAT...E WIND 15 KT. SEAS 6 FT. 
.SUN...NE WIND 15 KT. SEAS 6 FT.  

$$

PKZ414-241500-
BERING SEA OFFSHORE EAST OF 171W
400 PM AKDT TUE APR 23 2013

.TONIGHT...NE WIND 25 KT. SEAS IN ICE FREE WATERS 7 FT. PATCHY FOG. 
.WED AND WED NIGHT...NE WIND 20 KT. SEAS IN ICE FREE WATERS 5 FT.
PATCHY FOG. 
.THU THROUGH FRI...NE WIND 25 KT. SEAS IN ICE FREE WATERS 6 FT.
.SAT...NE WIND 15 KT. SEAS IN ICE FREE WATERS 4 FT. 
.SUN...N WIND 15 KT. SEAS IN ICE FREE WATERS 5 FT.  

$$

JM

430 
FZAK62 PAFC 241145
OFFALU

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 AM AKDT WED APR 24 2013

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.

PKZ499-250300-
400 AM AKDT WED APR 24 2013
.SYNOPSIS FOR CENTRAL BERING SEA...
HIGH PRESSURE WILL REMAIN OVER THE CENTRAL BERING SEA THROUGH THU
AFTERNOON. A WEATHER FRONT OVER THE WESTERN BERING SEA WILL DISSIPATE
BY AFTERNOON. 

$$

PKZ411-250300-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE
400 AM AKDT WED APR 24 2013

.TODAY...SE WIND 15 TO 25 KT. SEAS 8 FT. 
.TONIGHT...E WIND 20 KT. SEAS 8 FT. PATCHY FOG. 
.THU...NE WIND 15 KT. SEAS 7 FT. PATCHY FOG. 
.THU NIGHT AND FRI...NE WIND 20 KT. SEAS 8 FT. 
.SAT...SE WIND 15 KT. SEAS 5 FT.
.SUN...E WIND 20 KT. SEAS 6 FT.  

$$

PKZ412-250300-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N
400 AM AKDT WED APR 24 2013

.TODAY...E WIND 10 TO 20 KT. SEAS 6 FT. PATCHY FOG. 
.TONIGHT...NE WIND 10 TO 20 KT. SEAS 6 FT. PATCHY FOG. 
.THU...NE WIND 20 KT. SEAS 5 FT. PATCHY FOG. 
.THU NIGHT AND FRI...NE WIND 15 KT. SEAS 5 FT. 
.SAT...VARIABLE WIND 10 KT. SEAS 2 FT. 
.SUN...NE WIND 15 KT. SEAS 5 FT.  

$$

PKZ413-250300-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N
400 AM AKDT WED APR 24 2013

.TODAY...E WIND 20 KT. SEAS 8 FT. PATCHY FOG. 
.TONIGHT...E WIND 20 KT. SEAS 7 FT. PATCHY FOG. 
.THU...NE WIND 15 TO 25 KT. SEAS 7 FT. PATCHY FOG. 
.THU NIGHT AND FRI...NE WIND 25 KT. SEAS 8 FT. 
.SAT...NE WIND 20 KT. SEAS 5 FT.
.SUN...E WIND 20 KT. SEAS 6 FT.  

$$

PKZ414-250300-
BERING SEA OFFSHORE EAST OF 171W
400 AM AKDT WED APR 24 2013

.TODAY...NE WIND 20 KT. SEAS IN ICE FREE WATERS 5 FT. PATCHY FOG. 
.TONIGHT...NE WIND 20 KT. SEAS IN ICE FREE WATERS 5 FT. PATCHY FOG. 
.THU AND THU NIGHT...NE WIND 25 KT. SEAS IN ICE FREE WATERS 7 FT.
.FRI...N WIND 20 KT. SEAS IN ICE FREE WATERS 5 FT. 
.SAT AND SUN...N WIND 15 KT. SEAS IN ICE FREE WATERS 4 FT. 

$$

SOUTHCENTRAL AND SOUTHWEST ALASKA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ANCHORAGE AK
500 PM AKDT MON APR 22 2013

.MODEL DISCUSSION...
NUMERICAL GUIDANCE IN GOOD AGREEMENT THROUGH 84 HOURS. FORECASTS
GENERALLY FOLLOW THE NAM DUE TO ITS BETTER DEPICTION OF SMALL SCALE
FEATURES.

.ANALYSIS AND UPPER LEVELS...
THERE IS AN UPPER LEVEL RIDGE SITUATED ROUGHLY NORTH/SOUTH ACROSS
CENTRAL ALASKA. THERE IS ANOTHER AND MUCH STRONGER RIDGE OVER THE
BERING SEA. THERE IS A LOW SOUTH OF THE ALASKA PENINSULA WITH A LONG
SOUTHERLY FETCH OF MOISTURE STREAMING TOWARDS SOUTHERN ALASKA. WEAK
"TROUGHINESS" ALONG THE WEST COAST OF ALASKA WEAKLY ATTACHES THIS
LOW TO A SHORT WAVE LOW MOVING EAST OVER THE BERING STRAIT.

.SHORT TERM FORECAST...
FOR SOUTH CENTRAL AND SOUTHWEST ALASKA...MOISTURE FROM THE LOW SOUTH
OF THE ALASKA PENINSULA WILL PUSH INTO SOUTHERN ALASKA TONIGHT.
PRECIPITATION WILL SPREAD INTO SOUTHWEST ALASKA TONIGHT (EXCEPT THE
KUSKOKWIM DELTA REGION AND THE WESTERN PORTION OF THE THE LOWER
KUSKOKWIM VALLEY...WHICH WILL REMAIN DRY) AND INTO SOUTH CENTRAL ON
TUESDAY. PRECIPITATION MAY START AS SNOW...BUT WILL CHANGE TO RAIN
FOR MOST AREAS TUESDAY AFTERNOON AS WARM AIR SURGES NORTH INTO
SOUTHERN ALASKA. ONLY HIGHER ELEVATIONS AND AREAS FAR INLAND WILL
STAY SNOW THROUGH THE EVENT. THE BERING STRAIT SYSTEM WILL CONTINUE
TO MOVE EAST AND WILL BEGIN TO PUSH THE PRECIPITATION EAST AS
WELL...ENDING FROM THE WEST TUESDAY EVENING INTO WEDNESDAY. FLOW
ALOFT WILL BECOME MORE CYCLONIC AND NORTHWESTERLY LATE WEDNESDAY
THROUGH THURSDAY. THIS WILL KEEP A CHANCE OF PRECIPITATION FOR
PORTIONS OF SOUTH CENTRAL (MAINLY INLAND). IT WILL ALSO BRING IN
COLDER AIR ALOFT.

FOR THE ALEUTIANS AND BERING SEA...HIGH PRESSURE WILL REMAIN OVER
THE BERING SEA THROUGH THURSDAY BUT WILL CHANGE IN ORIENTATION AND
CHARACTER. CURRENTLY THE RIDGE EXTENDS SOUTHWARD INTO THE TROPICS
BLOCKING ALL WESTERLY FLOW ACROSS THE DATELINE FROM THE BERING SEA
SOUTH. AS A TROUGH TO THE WEST PUSHES INTO THE RIDGE IT WILL BEGIN
TO UNDERCUT THE RIDGE TUESDAY AFTERNOON AND COMPLETELY PUSH UNDER
IT BY WEDNESDAY AFTERNOON. THE RIDGE WILL THEN BECOME EAST/WEST
ORIENTED AND FORM A REX BLOCK (CLOSED HIGH NORTH OF A CLOSED LOW)
WHICH IS VERY STABLE...AND WILL HELP PUSH NORTHWESTERLY FLOW INTO
MAINLAND ALASKA AS MENTIONED ABOVE.

.AER/ALU...WATCH/WARNING SUMMARY
PUBLIC...NONE.
MARINE...GALE WARNING 120 130 138 150 155 170 176.
FIRE WEATHER...NONE.

LUDWIG APR 13