Storm Warning 30, NWS Anchorage, AK

626 
FZAK62 PAFC 220009
OFFALU

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 PM AKST THU FEB 21 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.

PKZ499-221500-
400 PM AKST THU FEB 21 2013
.SYNOPSIS FOR CENTRAL BERING SEA...

A 989 MB NORTH PACIFIC LOW WILL MOVE TO NEAR 50N 178E WHILE
STRENGTHENING TO 965 MB LATE THU NIGHT AND THEN MOVE TO NEAR 53N 175W
AT 960MB FRI AFTERNOON...THEN MOVE TO NEAR 56N 162W AT 972 MB BY
SAT AFTERNOON. A 987 MB LOW NEAR 58N 174E WILL DISSIPATE FRI MORNING.

$$

PKZ411-221500-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE
400 PM AKST THU FEB 21 2013

...GALE WARNING FRIDAY AND FRIDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING FRIDAY AND FRIDAY NIGHT...

.TONIGHT...SE WIND 15 TO 25 KT. SEAS 8 FT. SNOW.
.FRI...E WIND 35 KT BECOMING NE 45 KT BY MIDDAY. SEAS 13 FT BUILDING
TO 19 FT BY MIDDAY. RAIN AND SNOW. HEAVY FREEZING SPRAY BY MIDDAY N
OF 57N. 
.FRI NIGHT...NE WIND 40 KT DIMINISHING TO 30 KT AFTER MIDNIGHT. SEAS
20 FT. SNOW. HEAVY FREEZING SPRAY N OF 55N. 
.SAT...N WIND 30 KT. SEAS 18 FT. 
.SAT NIGHT...NE WIND 20 KT. SEAS 12 FT. 
.SUN...E WIND 20 KT. SEAS 9 FT. 
.MON AND TUE...E WIND 20 KT. SEAS 11 FT. 

$$

PKZ412-221500-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N
400 PM AKST THU FEB 21 2013

...GALE WARNING FRIDAY AND FRIDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING FRIDAY AND FRIDAY NIGHT...

.TONIGHT...SW WIND 25 KT DIMINISHING TO 15 KT IN THE AFTERNOON. SEAS
9 FT. 
.FRI...E WIND 30 KT BECOMING NE 45 KT IN THE AFTERNOON. SEAS 7 FT
BUILDING TO 13 FT IN THE AFTERNOON. HEAVY FREEZING SPRAY N OF 57N. 
.FRI NIGHT...NE WIND 45 KT. SEAS 22 FT. HEAVY FREEZING SPRAY. 
.SAT...N WIND 40 KT. SEAS 20 FT. 
.SAT NIGHT...NW WIND 25 KT. SEAS 13 FT. 
.SUN AND MON...NE WIND 20 KT. SEAS 8 FT. 
.TUE...NE WIND 20 KT. SEAS 11 FT.  

$$

PKZ413-221500-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N
400 PM AKST THU FEB 21 2013

...STORM WARNING FRIDAY...

.TONIGHT...SW WIND 25 KT BECOMING SE 20 KT AFTER MIDNIGHT. SEAS 10
FT. PATCHY FOG. RAIN AND SNOW. 
.FRI...E WIND 50. SEAS 15 FT BUILDING TO 22 FT IN THE AFTERNOON.
PATCHY FOG. RAIN AND SNOW. 
.FRI NIGHT...NE WIND 45 KT. SEAS 26 FT. PATCHY FOG. SNOW AND RAIN. 
.SAT...N WIND 40 KT. SEAS 25 FT. 
.SAT NIGHT...NW WIND 30 KT. SEAS 16 FT. 
.SUN...E WIND 25 KT. SEAS 11 FT. 
.MON...NE WIND 15 KT. SEAS 12 FT. 
.TUE...E WIND 20 KT. SEAS 16 FT.  

$$

PKZ414-221500-
BERING SEA OFFSHORE EAST OF 171W
400 PM AKST THU FEB 21 2013

...GALE WARNING FRIDAY AND FRIDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING FRIDAY NIGHT...

.TONIGHT...W WIND 30 KT DIMINISHING TO 20 KT AFTER MIDNIGHT. SEAS IN
ICE FREE WATERS 11 FT. 
.FRI...S WIND 25 KT BECOMING E 40 KT IN THE AFTERNOON. SEAS IN ICE
FREE WATERS 10 FT. PATCHY FOG. SNOW AND RAIN. 
.FRI NIGHT...NE WIND 35 KT EXCEPT SW 30 KT S OF 56N. SEAS IN ICE FREE
WATERS 15 FT. PATCHY FOG. SNOW. HEAVY FREEZING SPRAY N OF 56N.
.SAT...N WIND 35 KT. SEAS IN ICE FREE WATERS 22 FT. 
.SAT NIGHT...NW WIND 35 KT. SEAS IN ICE FREE WATERS 22 FT. 
.SUN...N WIND 30 KT. SEAS IN ICE FREE WATERS 10 FT. 
.MON...N WIND 20 KT. SEAS IN ICE FREE WATERS 8 FT. 
.TUE...NE WIND 20 KT. SEAS IN ICE FREE WATERS 10 FT.  

$$

794 
FZAK62 PAFC 221236
OFFALU

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 AM AKST FRI FEB 22 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.

PKZ499-230300-
400 AM AKST FRI FEB 22 2013
.SYNOPSIS FOR CENTRAL BERING SEA...

A 966 MB LOW NEAR 50N 179E WILL STRENGTHEN TO 960 MB AS IT MOVES TO
NEAR 53N 173W ON SAT MORNING. THIS LOW WILL THEN SLOWLY WEAKEN TO 983
MB AS IT MOVES TO 55N 158W ON SUN MORNING. A 994 MB NORTH PACIFIC LOW
WILL MOVE TO NEAR 45N 178E SUN MORNING. 

$$

PKZ411-230300-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE
400 AM AKST FRI FEB 22 2013

...GALE WARNING THROUGH TONIGHT...
...HEAVY FREEZING SPRAY WARNING THROUGH SATURDAY...

.TODAY...NE WIND 30 TO 45 KT. SEAS 12 FT BUILDING TO 18 FT IN THE
AFTERNOON...EXCEPT 11 FT N OF 57N. SNOW AND RAIN. HEAVY FREEZING
SPRAY N OF 58N. 
.TONIGHT...NE WIND 35 TO 45 KT DIMINISHING TO 25 TO 35 KT NEAR
MORNING. SEAS 16 TO 23 FT. HEAVY FREEZING SPRAY. 
.SAT...N WIND 30 KT DIMINISHING TO 20 KT IN THE AFTERNOON. SEAS 13 TO
18 FT. HEAVY FREEZING SPRAY.
.SAT NIGHT...NE WIND 20 KT. SEAS 11 FT. 
.SUN...E WIND 20 KT. SEAS 8 FT. 
.MON...E WIND 35 KT. SEAS 16 FT. 
.TUE...NE WIND 30 KT. SEAS 17 FT.  

$$

PKZ412-230300-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N
400 AM AKST FRI FEB 22 2013

...GALE WARNING THROUGH SATURDAY...
...HEAVY FREEZING SPRAY WARNING THROUGH SATURDAY...

.TODAY...E WIND 25 KT INCREASING TO 35 TO 45 KT IN THE AFTERNOON.
SEAS 7 FT BUILDING TO 13 FT IN THE AFTERNOON. SNOW. HEAVY FREEZING
SPRAY.
.TONIGHT...NE WIND 35 TO 45 KT. SEAS 14 TO 19 FT. SNOW. HEAVY
FREEZING SPRAY. 
.SAT...N WIND 25 TO 35 KT. SEAS 13 TO 17 FT. HEAVY FREEZING SPRAY.
.SAT NIGHT...N WIND 25 KT. SEAS 10 FT. 
.SUN...N WIND 20 KT. SEAS 7 FT. 
.MON...SE WIND 30 KT. SEAS 9 FT. 
.TUE...E WIND 35 KT. SEAS 18 FT.  

$$

PKZ413-230300-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N
400 AM AKST FRI FEB 22 2013

...STORM WARNING THROUGH TONIGHT...
...HEAVY FREEZING SPRAY WARNING SATURDAY...

.TODAY...E WIND 35 TO 50 KT. SEAS 13 FT BUILDING TO 18 FT IN THE
AFTERNOON. SNOW AND RAIN. 
.TONIGHT...NE WIND 35 TO 50 KT EXCEPT S 25 TO 40 KT E OF
174W....BECOMING NE 25 TO 40 KT AFTER MIDNIGHT. SEAS 18 TO 24 FT.
SNOW. FREEZING SPRAY AFTER MIDNIGHT. 
.SAT...N WIND 40 KT DIMINISHING TO 30 KT IN THE AFTERNOON. SEAS 15 TO
19 FT. HEAVY FREEZING SPRAY.
.SAT NIGHT...N WIND 30 KT. SEAS 12 FT. 
.SUN...NE WIND 15 KT. SEAS 8 FT. 
.MON...E WIND 35 KT. SEAS 18 FT. 
.TUE...NE WIND 35 KT. SEAS 19 FT.  

$$

PKZ414-230300-
BERING SEA OFFSHORE EAST OF 171W
400 AM AKST FRI FEB 22 2013

...GALE WARNING THROUGH SATURDAY...
...HEAVY FREEZING SPRAY WARNING SATURDAY...

.TODAY...E WIND 20 KT INCREASING TO 30 TO 40 KT IN THE AFTERNOON.
SEAS IN ICE FREE WATERS 8 FT BUILDING TO 12 FT. SNOW AND RAIN. 
.TONIGHT...E WIND 30 TO 40 KT...BECOMING S 20 TO 30 KT S OF 56N AFTER
MIDNIGHT. SEAS IN ICE FREE WATERS 14 FT BUILDING TO 19 FT. SNOW AND
RAIN. 
.SAT...NE WIND 25 TO 35 KT. SEAS IN ICE FREE WATERS 14 TO 18 FT.
SNOW. HEAVY FREEZING SPRAY N OF 56N. 
.SAT NIGHT...NW WIND 35 KT. SEAS IN ICE FREE WATERS 14 FT. 
.SUN...N WIND 25 KT. SEAS IN ICE FREE WATERS 7 FT. 
.MON...NE WIND 30 KT. SEAS IN ICE FREE WATERS 8 FT. 
.TUE...NE WIND 35 KT. SEAS IN ICE FREE WATERS 13 FT.  

$$

757 
FZAK62 PAFC 230002
OFFALU

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 PM AKST FRI FEB 22 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.

PKZ499-231500-
400 PM AKST FRI FEB 22 2013
.SYNOPSIS FOR CENTRAL BERING SEA...

A 961 MB LOW NEAR 53N 177W WILL MOVE TO NEAR 55N 165W WHILE SLOWLY
WEAKENING TO 972 MB SAT AFTERNOON...THEN CONTINUE TO WEAKEN WHILE
MOVING INTO THE WESTERN GULF OF ALASKA BY SUN AFTERNOON. A NORTH
PACIFIC LOW WILL MOVE TO NEAR 50N 173W AT 985 MB SUN AFTERNOON. WEAK
LOW PRESSURE WILL PERSIST OVER THE WESTERN BERING THROUGH SUN
AFTERNOON.

$$

PKZ411-231500-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE
400 PM AKST FRI FEB 22 2013

...GALE WARNING THROUGH SATURDAY...
...HEAVY FREEZING SPRAY WARNING THROUGH SATURDAY NIGHT...

.TONIGHT...NE WIND 45 KT. SEAS 18 FT. HEAVY FREEZING SPRAY. 
.SAT...N WIND 35 KT DIMINISHING TO 25 KT IN THE AFTERNOON. SEAS
16 FT. HEAVY FREEZING SPRAY. 
.SAT NIGHT...NE WIND 20 KT. SEAS 11 FT. HEAVY FREEZING SPRAY. 
.SUN...NE WIND 20 KT. SEAS 8 FT. 
.SUN NIGHT...SE WIND 25 KT. SEAS 6 FT. 
.MON...SE WIND 35 KT. SEAS 16 FT. 
.TUE...NE WIND 30 KT. SEAS 17 FT. 
.WED...N WIND 20 KT. SEAS 14 FT.  

$$

PKZ412-231500-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N
400 PM AKST FRI FEB 22 2013

...GALE WARNING THROUGH SATURDAY...
...HEAVY FREEZING SPRAY WARNING THROUGH SATURDAY NIGHT...

.TONIGHT...NE WIND 45 KT. SEAS 19 FT. HEAVY FREEZING SPRAY. 
.SAT...NE WIND 40 KT DIMINISHING TO 30 KT IN THE AFTERNOON. SEAS 16
FT SUBSIDING TO 12 FT IN THE AFTERNOON. HEAVY FREEZING SPRAY. 
.SAT NIGHT...N WIND 25 KT. SEAS 10 FT. HEAVY FREEZING SPRAY. 
.SUN...N WIND 20 KT. SEAS 7 FT. 
.SUN NIGHT...N WIND 20 KT. SEAS 6 FT. 
.MON...SE WIND 30 KT. SEAS 9 FT. 
.TUE...E WIND 35 KT. SEAS 18 FT. 
.WED...N WIND 25 KT. SEAS 13 FT.  

$$

PKZ413-231500-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N
400 PM AKST FRI FEB 22 2013

...GALE WARNING THROUGH SATURDAY...
...HEAVY FREEZING SPRAY WARNING SATURDAY AND SATURDAY NIGHT...

.TONIGHT...NE WIND 45 KT EXCEPT S 35 KT E OF 174W. SEAS 21 FT. RAIN
AND SNOW. FREEZING SPRAY W OF 174W. 
.SAT...N WIND 30 TO 40 KT. SEAS 18 FT. SNOW AND RAIN. HEAVY FREEZING
SPRAY. 
.SAT NIGHT...N WIND 30 KT DIMINISHING TO 15 KT AFTER MIDNIGHT. SEAS
12 FT. HEAVY FREEZING SPRAY. 
.SUN...NE WIND 20 KT. SEAS 8 FT. 
.SUN NIGHT...NE WIND 25 KT. SEAS 7 FT. 
.MON...E WIND 35 KT. SEAS 18 FT. 
.TUE...NE WIND 35 KT. SEAS 19 FT. 
.WED...N WIND 25 KT. SEAS 16 FT.  

$$

PKZ414-231500-
BERING SEA OFFSHORE EAST OF 171W
400 PM AKST FRI FEB 22 2013

...GALE WARNING THROUGH SATURDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING THROUGH SATURDAY NIGHT...

.TONIGHT...NE WIND 35 KT EXCEPT SW 35 KT S OF 56N. SEAS IN ICE FREE
WATERS 16 FT. RAIN AND SNOW. HEAVY FREEZING SPRAY N OF 56N.
.SAT...NE WIND 30 KT INCREASING TO 40 KT IN THE AFTERNOON. SEAS IN
ICE FREE WATERS 15 FT. SNOW AND RAIN. HEAVY FREEZING SPRAY W OF 160W.

.SAT NIGHT...N WIND 35 TO 45 KT. SEAS IN ICE FREE WATERS 15 FT
SUBSIDING TO 10 FT AFTER MIDNIGHT. SNOW. HEAVY FREEZING SPRAY. 
.SUN...NW WIND 20 KT. SEAS IN ICE FREE WATERS 7 FT. 
.SUN NIGHT...N WIND 30 KT. SEAS IN ICE FREE WATERS 9 FT.
.MON...NE WIND 35 KT. SEAS IN ICE FREE WATERS 8 FT. 
.TUE...NE WIND 35 KT. SEAS IN ICE FREE WATERS 13 FT. 
.WED...N WIND 25 KT. SEAS IN ICE FREE WATERS 11 FT.  

$$

SOUTHCENTRAL AND SOUTHWEST ALASKA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ANCHORAGE AK
420 PM AKST WED FEB 20 2013

.ANALYSIS AND UPPER LEVELS...
A CLOSED UPPER HIGH REMAINS IN PLACE OVER THE CHUKCHI SEA THIS
AFTERNOON...WITH A LARGE UPPER LOW LOCATED TO ITS SOUTHWEST NEAR THE
SOUTHERN KAMCHATKA PENINSULA AND ZONAL FLOW SPANNING MUCH OF THE
NORTHERN PACIFIC. A PAIR OF UPPER LOWS ARE LOCATED OVER THE GULF OF
ALASKA...WITH ONE LOCATED OVER THE NORTHERN GULF NEAR KODIAK ISLAND
AND THE OTHER MOVING RAPIDLY EASTWARD TOWARD THE PANHANDLE AS IT
TRANSITIONS INTO AN OPEN WAVE. A 979 MB LOW IS PRESENT OVER THE
NORTHERN GULF WITH AN ASSOCIATED FRONT EXTENDING EASTWARD FROM THE
CENTER AS THESE FEATURES CONTINUE TO BRING SNOW SHOWERS TO AREAS
ALONG THE COAST.

.MODEL DISCUSSION...
DESPITE SOME VARIATIONS IN STRENGTH AND TIMING OF SYSTEMS...MODELS
ARE IN REASONABLE AGREEMENT THROUGH THE SHORT TERM WITH RESPECT TO
THE OVERALL SYNOPTIC PATTERN. THE CHUKCHI SEA HIGH/KAMCHATKA LOW WILL
BOTH REMAIN IN PLACE THROUGH LATE THURSDAY NIGHT AS A SERIES OF WAVES
CONTINUE TO MOVE RAPIDLY EASTWARD ACROSS THE NORTHERN PACIFIC. THE
KAMCHATKA LOW WILL THEN BEGIN TO WEAKEN ON FRIDAY AS A STRONG NORTH
PACIFIC LOW RAPIDLY DEVELOPS ALONG ITS EASTERN PERIPHERY AND MOVES
INTO THE WESTERN/CENTRAL ALEUTIANS...BRINGING STRONG WINDS AND
PRECIPITATION TO THOSE AREAS. MEANWHILE...THE CHUKCHI HIGH WILL
RETREAT POLEWARD INTO THE ARCTIC AS A CLOSED UPPER LOW DEVELOPS OVER
NORTHERN ALASKA AND SLIDES SOUTHWESTWARD TOWARD THE BERING STRAIT BY
THE END OF THE WEEK.

.SHORT TERM FORECAST...
SOUTHCENTRAL ALASKA...
SNOW WILL BEGIN TO SPREAD INLAND OVER SOUTHCENTRAL ALASKA TONIGHT AND
PERSIST THROUGH THURSDAY NIGHT AS THE LOW OVER THE NORTHERN GULF
BECOMES NEARLY STATIONARY AND THEN MOVES SLOWLY NORTHWARD TOWARD THE
KENAI PENINSULA. SNOW WILL BEGIN TO TAPER OFF ON FRIDAY MORNING AS
THE LOW WEAKENS...HOWEVER A CHANCE OF PRECIPITATION WILL REMAIN IN
THE FORECAST THROUGH THE WEEKEND AS ANOTHER FRONT MOVES INTO THE
GULF.

SOUTHWEST ALASKA...
SCATTERED SNOW SHOWERS WILL CONTINUE THROUGH THURSDAY AND THEN BEGIN
TO TAPER OFF BY FRIDAY MORNING AS TRANSITORY RIDGING MOVES OVERHEAD.
THE BREAK IN PRECIPITATION WILL BE SHORT LIVED AS A FRONT ASSOCIATED
WITH THE STRONG LOW MOVING OVER THE ALEUTIANS WILL REACH THE AKPEN ON
FRIDAY AND APPROACH THE SOUTHWEST MAINLAND ON FRIDAY NIGHT.

ALEUTIANS/BERING SEA...
PERIODS OF RAIN AND SNOW WILL CONTINUE THROUGH THURSDAY ACROSS THE
ALEUTIANS AS ANOTHER SYSTEM TRAVERSES THE NORTHERN PACIFIC. A
POWERFUL LOW WILL THEN MOVE OVER THE WESTERN AND CENTRAL ALEUTIANS BY
FRIDAY MORNING...BRINGING WIDESPREAD PRECIPITATION AND STRONG WINDS
TO THE SOUTHERN BERING AS THE SYSTEM ADVANCES EASTWARD.

.LONG TERM FORECAST...
AN ACTIVE PATTERN WILL CONTINUE INTO THE EXTENDED TERM AS A LONG WAVE
TROUGH REMAINS IN PLACE OVER THE BERING AND SYSTEMS MOVING ACROSS THE
NORTHERN PACIFIC CONTINUE TO BRING PERIODIC CHANCES OF PRECIPITATION
TO SOUTHERN ALASKA.

.AER/ALU...WATCH/WARNING SUMMARY
PUBLIC...NONE
MARINE...GALE WARNING 130 132 136 137 138 150 155
         HEAVY FREEZING SPRAY 130 140 141
FIRE WEATHER...NONE

CB FEB 13