Gale Warning 593, NWS Anchorage, AK

380 
FZAK62 PAFC 121233 CCA
OFFALU

OFFSHORE WATERS FORECAST...CORRECTED
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 AM AKDT SUN SEP 12 2010

CORRECT TYPO ZONE 414

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.

PKZ499-130000-
400 AM AKDT SUN SEP 12 2010
.SYNOPSIS FOR CENTRAL BERING SEA...

A 987 MB LOW NEAR 52N 179E STRENGTHENS TO 983 MB AT 61N 175E THIS
AFTERNOON AND THEN MOVES INTO EASTERN RUSSIA. THE ASSOCIATED WEATHER
FRONT OVER THE CENTRAL BERING REACHES THE EASTERN BERING ON MON
MORNING.

$$

PKZ411-130000-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE
400 AM AKDT SUN SEP 12 2010

...GALE WARNING TODAY...

.TODAY...VARIABLE WIND 10 TO 20 KT INCREASING TO W 35 KT THIS
AFTERNOON. SEAS BUILDING TO 13 FT. PATCHY FOG. RAIN.
.TONIGHT...SW WIND 25 KT. SEAS 13 FT. PATCHY FOG. 
.MON...S WIND 25 KT. SEAS 10 FT. PATCHY FOG. 
.MON NIGHT AND TUE...S WIND 25 KT. SEAS 9 FT. 
.WED AND THU...NE WIND 30 KT. SEAS 14 FT. 

$$

PKZ412-130000-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N
400 AM AKDT SUN SEP 12 2010

...STORM WARNING THROUGH TONIGHT...

.TODAY...SE WIND 40 TO 50 KT. SEAS 15 TO 19 FT. PATCHY FOG. RAIN.
.TONIGHT...E OF 175W...SE WIND 40 TO 50 KT DIMINISHING TO 35 KT AFTER
MIDNIGHT. W OF 175W...SE TO SW WIND 25 TO 35 KT BECOMING W 20 KT
AFTER MIDNIGHT. SEAS 15 TO 10 FT. PATCHY FOG. RAIN.
.MON...SW WIND 20 KT. SEAS 13 FT. PATCHY FOG. 
.MON NIGHT AND TUE...S WIND 25 KT. SEAS 9 FT. 
.WED...SE WIND 30 KT. SEAS 13 FT. 
.THU...SE WIND 25 KT. SEAS 12 FT.  

$$

PKZ413-130000-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N
400 AM AKDT SUN SEP 12 2010

...STORM WARNING TODAY...

.TODAY...E OF 176W...SE WIND 40 TO 50 KT. W OF 176W...SE WIND 40 TO
50 KT DIMINISHING TO S 30 KT THE AFTERNOON. SEAS 8 TO 17 FT. PATCHY
FOG. RAIN.
.TONIGHT...E OF 174W...SE WIND 45 KT DIMINISHING TO SW 15 TO 25 KT
AFTER MIDNIGHT. W OF 174W...S TO W WIND 15 TO 25 KT. SEAS 8 TO 16 FT.
PATCHY FOG. 
.MON...SW WIND 20 KT. SEAS 9 FT. PATCHY FOG. 
.MON NIGHT...SW WIND 25 KT. SEAS 8 FT. 
.TUE...S WIND 25 KT. SEAS 8 FT. 
.WED...SE WIND 35 KT. SEAS 15 FT. 
.THU...E WIND 30 KT. SEAS 14 FT.  

$$

PKZ414-130000-
BERING SEA OFFSHORE EAST OF 171W
400 AM AKDT SUN SEP 12 2010

...GALE WARNING THROUGH MONDAY...

.TODAY...SE WIND 20 TO 30 KT INCREASING TO 35 TO 45 KT THIS
AFTERNOON. SEAS BUILDING TO 12 TO 16 FT. PATCHY FOG. 
.TONIGHT...SE WIND 35 TO 45 KT. SEAS 14 TO 17 FT. PATCHY FOG. RAIN.
.MON...S WIND 40 KT DIMINISHING TO 30 KT IN THE AFTERNOON. SEAS
15 FT. PATCHY FOG. RAIN.
.MON NIGHT...S WIND 30 KT. SEAS 11 FT. 
.TUE...S WIND 25 KT. SEAS 7 FT. 
.WED AND THU...SE WIND 30 KT. SEAS 11 FT. 

$$

AREA FORECAST DISCUSSION
SOUTHCENTRAL AND SOUTHWEST ALASKA
500 PM AKDT SAT SEP 11 2010

.ANALYSIS AND UPPER LEVELS...
AN UPPER LEVEL RIDGE STRETCHING FROM THE EASTERN ALEUTIANS TO THE
NORTH SLOPE CONTINUES TO STRENGTHEN AS IT SLIDES SLOWLY EASTWARD.
MEANWHILE...A LOW IS DEVELOPING SOUTH OF SHEMYA AND IS MOVING TO THE
NORTH. ANOTHER LOW IS VERTICALLY STACKED AND NEARLY STATIONARY OVER
THE QUEEN CHARLOTTE ISLANDS. OVER MAINLAND ALASKA...AREAS OF FOG
FORMED OVERNIGHT AND ARE SLOWLY DISSIPATING OVER COOK INLET...THE
COPPER RIVER BASIN...AND SOUTHWEST ALASKA.

.MODEL DISCUSSION...MODELS ARE IN UNUSUALLY GOOD AGREEMENT IN HOLDING
SOME FORM OF UPPER LEVEL HIGH PRESSURE OVER THE STATE THROUGH THE END
OF THE WEEK. THE LONGWAVE TROUGH CURRENTLY OVER THE WESTERN BERING
SEA WILL SLIDE EAST TO INCLUDE ALL OF THE BERING SEA BY LATE
SUNDAY...BUT EASTWARD PROGRESS WILL HALT AS INTERIOR HIGH PRESSURE
HOLDS FIRM. THE RIDGE WILL ALSO FORCE THE DEVELOPING LOW PRESSURE
SOUTH OF SHEMYA TO HEAD RAPIDLY DUE NORTH AND INTO RUSSIA BY SUNDAY
EVENING.

.SHORT TERM FORECAST...
.SOUTH AND EAST OF THE ALASKA RANGE...UNSEASONABLY PLEASANT WEATHER
WILL CONTINUE THROUGH THE END OF THE WEEK. PROBLEMS WITH OVERNIGHT
FOG WILL CONTINUE IN THE COPPER RIVER BASIN AND IN SOME COASTAL
AREAS...BUT SHOULD DIMINISH IN EXTENT AND SEVERITY EACH NIGHT AS THE
LOWER LEVELS OF THE ATMOSPHERE CONTINUE TO DRY OUT UNDER LARGE SCALE
SINKING MOTION. MAY SEE AN ISOLATED SHOWER THIS AFTERNOON AND EVENING
OVER THE TALKEETNA MOUNTAINS...BUT SHOULD BE LAST DAY WITH ANY
NOTABLE CONVECTION AS THE LOW LEVEL CAPPING INVERSION IS EXPECTED TO
INTENSIFY.

.WEST OF THE ALASKA RANGE...HIGH PRESSURE RIDGING TO RETREAT SLOWLY
EASTWARD...BRINGING LIGHT SOUTHERLY WINDS TO MOST OF THE AREA
BEGINNING SUNDAY. WILL LIKELY SEE FOG REDEVELOP ACROSS THE AREA
OVERNIGHT BEFORE WINDS INCREASE. BEGINNING LATER SUNDAY...MAIN
CHALLENGE WILL BE KEEPING UP WITH MARINE LAYER FOG THAT MAY LINGER
PRIMARILY ALONG COASTAL AREAS FOR NEXT SEVERAL DAYS. THE FRONT
ASSOCIATED WITH A FAIRLY STRONG BERING LOW WILL RAPIDLY WEAKEN AS IT
APPROACHES THE COAST MONDAY NIGHT...AND WOULD NOT EXPECT ANYTHING
MORE THAN A FEW SPRINKLES.

.BERING SEA/ALEUTIANS...THE IMPACTS OF A MODERATE 984 MB LOW MOVING
QUICKLY THROUGH THE BERING WILL BE ENHANCED BY THE PRESENCE OF STRONG
HIGH PRESSURE TO THE EAST. A STRONG PRESSURE GRADIENT OVER THE
CENTRAL BERING AND ALEUTIANS SHOULD BE MORE THAN ENOUGH TO GENERATE
STORM FORCE WINDS TONIGHT AND TOMORROW AS THE LOW CENTER RACES TO THE
NORTH. WITH AMPLE WARM AND MOIST AIR BEING TRANSPORTED NORTHWARD WITH
THE JET...RAIN WILL LIKELY BE HEAVY AT TIMES ACROSS THE CENTRAL
ALEUTIANS WITH THIS SYSTEM.

.LONG TERM FORECAST...SUNNY AND WARM CONDITIONS PERSIST ACROSS MOST
OF MAINLAND ALASKA THROUGH THE END OF THE WEEK. ANOTHER STORM
APPROACHES THE WESTERN ALEUTIANS MIDWEEK...AS THE LONGWAVE TROUGH
REMAINS IN PLACE.

.AER/ALU...WATCH/WARNING SUMMARY
PUBLIC...NONE
MARINE...STORM 172 175 185
         GALE 170 179 180
FIRE WEATHER...NONE

AMD SEP 10