Storm Warning 97, NWS Anchorage, AK

558 
FZAK61 PAFC 242341
OFFAER

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 PM AKDT SAT APR 24 2010

OFFSHORE WATERS FORECAST FOR THE GULF OF ALASKA WEST OF 144W

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.

PKZ399-251400-
400 PM AKDT SAT APR 24 2010
.SYNOPSIS FOR THE WESTERN GULF OF ALASKA...

A 990 MB LOW NEAR 50N 146W WILL STRENGTHEN TO 979 MB AS IT MOVES TO
54N 150W SUN AFTERNOON. THIS LOW WILL THEN MOVE TO 52N 144W MON
AFTERNOON. ANOTHER LOW WILL FORM OVER THE SOUTHERN GULF MON MORNING
AND MOVE TO 56N 149W MON AFTERNOON AT 984 MB.

$$

PKZ351-251400-
GULF OF ALASKA OFFSHORE NORTH OF 57N AND WEST OF 144W
400 PM AKDT SAT APR 24 2010

...STORM WARNING SUNDAY...

.TONIGHT...E WIND INCREASING TO 30 KT. SEAS BUILDING TO 9 FT. 
.SUN...E WIND INCREASING TO 50 KT IN THE MORNING AND DIMINISHING TO
40 KT IN THE AFTERNOON. SEAS BUILDING TO 19 FT. PATCHY FOG. RAIN.
.SUN NIGHT...E WIND 35 KT DIMINISHING TO 25 KT AFTER MIDNIGHT. SEAS
19 FT SUBSIDING TO 14 FT AFTER MIDNIGHT. PATCHY FOG. 
.MON...E WIND 35 KT. SEAS BUILDING TO 19 FT. 
.MON NIGHT...E WIND 25 KT. SEAS 16 FT. 
.TUE...E WIND 15 KT. SEAS 12 FT. 
.WED...S WIND 15 KT. SEAS 8 FT. 
.THU...SW WIND 15 KT. SEAS 7 FT.  

$$

PKZ352-251400-
GULF OF ALASKA OFFSHORE SOUTH OF 57N NORTH OF 55N AND WEST OF
144W
400 PM AKDT SAT APR 24 2010

...GALE WARNING THROUGH SUNDAY...

.TONIGHT...NE WIND 25 KT INCREASING TO 35 KT AFTER MIDNIGHT. SEAS
10 FT. 
.SUN...E WIND 40 KT BECOMING SE 20 KT IN THE AFTERNOON. SEAS 14 FT.
PATCHY FOG. 
.SUN NIGHT...E WIND 20 KT. SEAS 14 FT. PATCHY FOG. 
.MON...NE WIND 25 KT. SEAS 14 FT. 
.MON NIGHT...E WIND 25 KT. SEAS 13 FT. 
.TUE...SE WIND 15 KT. SEAS 11 FT. 
.WED...S WIND 20 KT. SEAS 8 FT. 
.THU...SW WIND 20 KT. SEAS 10 FT.  

$$

576 
FZAK61 PAFC 251136
OFFAER

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 AM AKDT SUN APR 25 2010

OFFSHORE WATERS FORECAST FOR THE GULF OF ALASKA WEST OF 144W

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.

PKZ399-260200-
400 AM AKDT SUN APR 25 2010
.SYNOPSIS FOR THE WESTERN GULF OF ALASKA...
A LOW NEAR 53N 147W WILL MOVE TO 56N 150W AT 982 MB SUN AFTERNOON
THEN DISSIPATE NEAR 53N 151W MON MORNING. ANOTHER LOW WILL DEVELOP
NEAR 55N 145W MON MORNING AND THEN MOVE TO 56N 151W AT 981 MB MON
EVENING AND THEN REMAIN NEARLY STATIONARY THROUGH TUE.
$$

PKZ351-260200-
GULF OF ALASKA OFFSHORE NORTH OF 57N AND WEST OF 144W
400 AM AKDT SUN APR 25 2010

...STORM WARNING TODAY...

.TODAY...E WIND 50 KT. SEAS 19 FT. PATCHY FOG. RAIN.
.TONIGHT...E WIND 35 KT DIMINISHING TO 25 KT AFTER MIDNIGHT. SEAS
16 FT. PATCHY FOG. 
.MON...E WIND 40 KT. SEAS 17 FT. 
.MON NIGHT...E WIND 25 KT. SEAS 14 FT. 
.TUE...E WIND 15 KT. SEAS 9 FT. 
.WED...SE WIND 15 KT. SEAS 7 FT. 
.THU...SW WIND 20 KT. SEAS 9 FT.  
$$

PKZ352-260200-
GULF OF ALASKA OFFSHORE SOUTH OF 57N NORTH OF 55N AND WEST OF
144W
400 AM AKDT SUN APR 25 2010

...GALE WARNING TODAY...

.TODAY...E WIND 35 KT. SEAS 13 FT. PATCHY FOG. 
.TONIGHT...E WIND 25 KT. SEAS 12 FT. PATCHY FOG. 
.MON AND MON NIGHT...E WIND 25 KT. SEAS 11 FT. 
.TUE...SE WIND 20 KT. SEAS 9 FT. 
.WED...SW WIND 20 KT. SEAS 11 FT. 
.THU...W WIND 25 KT. SEAS 11 FT.  
$$

691 
FZAK61 PAFC 252346
OFFAER

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 PM AKDT SUN APR 25 2010

OFFSHORE WATERS FORECAST FOR THE GULF OF ALASKA WEST OF 144W

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.

PKZ399-261400-
400 PM AKDT SUN APR 25 2010
.SYNOPSIS FOR THE WESTERN GULF OF ALASKA...

A 981 MB LOW NEAR 55N 150W WILL DISSIPATE LATE SUN NIGHT NEAR 
53N 152W. A 980 MB LOW NEAR 52N 144W SUN NIGHT WILL MOVE TO 
57N 150W MON AFTERNOON...AND THEN MOVE TO 55N 150W TUE AFTERNOON 
AT 987 MB.

$$

PKZ351-261400-
GULF OF ALASKA OFFSHORE NORTH OF 57N AND WEST OF 144W
400 PM AKDT SUN APR 25 2010

...STORM WARNING TONIGHT...

.TONIGHT...E WIND 40 TO 50 KT BECOMING 20 TO 30 KT BY MIDNIGHT. SEAS
20 FT. PATCHY FOG. 
.MON...E WIND 25 TO 35 KT. SEAS 19 FT. 
.MON NIGHT...E WIND 25 KT. SEAS 18 FT. 
.TUE...E WIND 15 KT. SEAS 11 FT. 
.TUE NIGHT...E WIND 15 KT. SEAS 8 FT. 
.WED...SE WIND 20 KT. SEAS 8 FT. 
.THU...SW WIND 20 KT. SEAS 9 FT.
.FRI...S WIND 30 KT. SEAS 14 FT.  

$$

PKZ352-261400-
GULF OF ALASKA OFFSHORE SOUTH OF 57N NORTH OF 55N AND WEST OF
144W
400 PM AKDT SUN APR 25 2010

.TONIGHT...SE WIND 20 KT. SEAS 15 FT. PATCHY FOG. 
.MON...NE WIND 20 KT. SEAS 14 FT. 
.MON NIGHT...E WIND 20 KT. SEAS 13 FT. 
.TUE AND TUE NIGHT...SE WIND 15 KT. SEAS 9 FT. 
.WED THROUGH THU...W WIND 25 KT. SEAS 11 FT. 
.FRI...S WIND 35 KT. SEAS 16 FT.  

$$

892 
FZAK61 PAFC 261130
OFFAER

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
400 AM AKDT MON APR 26 2010

OFFSHORE WATERS FORECAST FOR THE GULF OF ALASKA WEST OF 144W

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.

PKZ399-270200-
400 AM AKDT MON APR 26 2010
.SYNOPSIS FOR THE WESTERN GULF OF ALASKA...
A 983 MB LOW WILL DEVELOP NEAR 56N 149W MON AFTERNOON AND MOVE TO
56N 152W AT 986 MB EARLY TUE MORNING. THE LOW WILL REMAIN NEARLY
STATIONARY AND SLOWLY WEAKEN THROUGH WED.
$$

PKZ351-270200-
GULF OF ALASKA OFFSHORE NORTH OF 57N AND WEST OF 144W
400 AM AKDT MON APR 26 2010

...GALE WARNING TODAY...

.TODAY...E WIND 35 KT. SEAS 20 FT. 
.TONIGHT...E WIND 30 KT DIMINISHING TO 20 KT AFTER MIDNIGHT. SEAS
15 FT. 
.TUE...E WIND 20 KT. SEAS 11 FT. 
.TUE NIGHT...VARIABLE WIND 10 KT. SEAS 8 FT. 
.WED AND THU...SE WIND 20 KT. SEAS 8 FT. 
.FRI...S WIND 15 KT. SEAS 6 FT.  
$$

PKZ352-270200-
GULF OF ALASKA OFFSHORE SOUTH OF 57N NORTH OF 55N AND WEST OF
144W
400 AM AKDT MON APR 26 2010

.TODAY...E WIND 25 KT. SEAS 18 FT. 
.TONIGHT...E WIND 20 KT. SEAS 13 FT. 
.TUE...SE WIND 15 KT. SEAS 10 FT. 
.TUE NIGHT THROUGH THU...SW WIND 20 KT. SEAS 9 FT.
.FRI...S WIND 20 KT. SEAS 8 FT.  
$$

AREA FORECAST DISCUSSION
SOUTHCENTRAL AND SOUTHWEST ALASKA
200 PM AKDT FRI APR 23 2010

.ANALYSIS AND UPPER LEVELS...
THE LONG WAVE UPPER PATTERN IS A STABLE ONE...CONSISTING OF A BROAD
TROUGH CENTERED OVER THE SEWARD PENINSULA AND MULTIPLE SHORTWAVES
MOVING WEST TO EAST NEAR THE BASE OF THE TROUGH. HIGH PRESSURE AT THE
SURFACE IS BUILDING OVER SOUTHCENTRAL ALASKA AND THE BERING SEA WHILE
A 987 MB LOW AND ASSOCIATED FRONTAL BOUNDARY SKIMS THE CENTRAL
ALEUTIANS TODAY.

.MODEL DISCUSSION...MODELS CONTINUE TO DO A GREAT JOB UNTIL THE LOW
SOUTH OF THE CHAIN ENTERS THE GULF LATER IN THE WEEKEND. WE CONTINUE
TO LEAN TOWARD THE ECMWF THAT IS THE SLOWEST AND MOST WESTWARD TRACK
OF THE LOW. THE GFS HAS BEEN TRENDING SLOWLY TOWARD THIS SOLUTION. IN
THE SHORT TERM...THE NAM IS THE PREFERRED MODEL BECAUSE OF ITS
SUPERIOR RESOLUTION AND DEPICTION OF THE SMALL SCALE FEATURES.

.SHORT TERM FORECAST...
.SOUTHCENTRAL...HIGH PRESSURE CENTERED OVER THE COPPER RIVER BASIN
WHILE A WEAK UPPER TROUGH MOVES NORTH ALONG THE ALASKA RANGE. THE
UPPER LEVELS ARE RELATIVELY MOIST ALTHOUGH DRY AIR AT THE SURFACE IS
RESULTING IN FAIR SKIES AROUND MOST OF THE REGION. THE LOWER LEVELS
ARE WARMING UP QUICKLY EARLY THIS AFTERNOON WHILE THE UPPER LEVELS
ARE STILL PRETTY COOL...GIVING US AN UNSTABLE PROFILE. SHOWERS ARE
DEVELOPING FROM THE WESTERN KENAI UP TO THE SUSITNA VALLEY ALTHOUGH
THE DRY AIR NEAR THE SURFACE IS EVAPORATING MOST OF THE MOISTURE
BEFORE IT REACHES THE GROUND. SHOWER ACTIVITY WILL DIMINISH SATURDAY
AS MOSTLY CLEAR SKIES PREVAIL UNTIL THE FRONT IN THE GULF APPROACHES
SUNDAY AFTERNOON. THIS FRONT WILL BRING PLENTY OF MOISTURE TO THE
COAST BUT RAIN WILL HAVE A DIFFICULT TIME MAKING IT INLAND.
INLAND...EXPECT MOSTLY CLOUDY SKIES TO PREVAIL MONDAY THROUGH
WEDNESDAY NEXT WEEK.

.SOUTHWEST...
CLOUDY AND COOL WEATHER CONTINUES OUT WEST UNDER THE UPPER LEVEL
TROUGH CENTERED OVER THE KUSKOKWIM VALLEY. ONSHORE FLOW IS USHERING
THE MOISTURE INLAND RESULTING IN WIDESPREAD LOW CEILINGS AND PERIODS
OF LIGHT SNOW. FLOW WILL REVERSE OVER THE NEXT 24 HOURS AS HIGH
PRESSURE BUILDS TO THE NORTH. THE CALM WINDS AND BUILDING HIGH
PRESSURE COULD LEAD TO WIDESPREAD FOG SATURDAY MORNING. THE
ATMOSPHERE BECOMES A LITTLE BIT MORE UNSTABLE EARLY NEXT WEEK SO LOW
TOP AFTERNOON AND EVENING CONVECTIVE ACTIVITY ARE POSSIBLE THROUGH
MID WEEK AS TEMPERATURES WARM UP TO ABOVE CLIMATOLOGICAL AVERAGES.

.BERING SEA/ALEUTIANS...HIGH PRESSURE BUILDING WILL PROVIDE FAIR
WEATHER FOR MUCH OF THE BERING SEA. THE LOW MOVING JUST SOUTH OF THE
CHAIN WILL BRING GALE FORCE EASTERLY WINDS TO THE CENTRAL ALEUTIANS
TONIGHT BEFORE DROPPING SOUTH AWAY FROM OUR AREA OF RESPONSIBILITY.
HIGH PRESSURE STAYS IN CONTROL WITH BROAD EAST TO NORTHEASTERLY FLOW
THROUGH EARLY NEXT WEEK.

.AER/ALU...WATCH/WARNING SUMMARY
PUBLIC...NONE.
MARINE...GALE WARNING...172
FIRE WEATHER...NONE.

AB APR 10