Small Craft Advisory 977, NWS Anchorage, AK

185 
FZAK52 PAFC 221258
CWFALU

Coastal Waters Forecast
National Weather Service Anchorage Alaska
358 AM AKST Fri Dec 22 2017

Coastal Waters Forecast for Southwest Alaska+Bristol Bay+The
Alaska Peninsula Waters and the Aleutian Islands up to 100 nm out.

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.

PKZ199-230145-
358 AM AKST Fri Dec 22 2017
.SYNOPSIS FOR SOUTHWEST ALASKA+BRISTOL BAY+THE ALASKA
PENINSULA WATERS AND THE ALEUTIAN ISLANDS...
A 978 mb low 180 nm North of Dutch Harbor moves into the Gulf of 
Anadyr at 985 mb Sat morning. The associated front wraps over the 
Eastern Bering through Sat morning. A 975 mb low 535 nm South of 
Sand Point Fri afternoon moves along the front to 185 nm Southeast
of Chignik at 990 mb for Sun morning. Three 995 mb lows slip 
across the Western Bering by Sun morning.

$$

PKZ150-230145-
South of the AK Peninsula Sitkinak to Castle Cape-
358 AM AKST Fri Dec 22 2017

...GALE WARNING THROUGH SATURDAY...

.TODAY...SE wind 45 kt. Seas 30 ft. Rain.
.TONIGHT...E wind 45 kt. Seas 23 ft. Rain.
.SAT...E wind 40 kt. Seas 23 ft.
.SAT NIGHT...SE wind 35 kt. Seas 20 ft.
.SUN...SW wind 35 kt. Seas 19 ft.
.MON...N wind 20 kt. Seas 9 ft.
.TUE...NE wind 20 kt. Seas 12 ft.

$$

PKZ155-230145-
South of the AK Peninsula Castle Cape to Cape Sarichef-
358 AM AKST Fri Dec 22 2017

...STORM WARNING SATURDAY...

.TODAY...SE wind 30 kt. Seas 23 ft. Rain.
.TONIGHT...E wind 35 kt. Seas 21 ft. Rain and snow showers.
.SAT...NW wind 50 kt except E 30 kt from the Shumagin Islands E.
Seas 20 ft. Rain and snow showers.
.SAT NIGHT...W wind 45 kt. Seas 21 ft.
.SUN...W wind 40 kt. Seas 17 ft.
.MON THROUGH TUE...NE wind 20 kt. Seas 10 ft.

$$

PKZ160-230145-
Bristol Bay-
358 AM AKST Fri Dec 22 2017

...STORM WARNING TODAY...

.TODAY...E wind 50 kt. Seas 15 ft. Rain.
.TONIGHT...E wind 45 kt. Seas 11 ft.
.SAT...E wind 45 kt. Seas 11 ft.
.SAT NIGHT...E wind 30 kt. Seas 9 ft.
.SUN...S wind 25 kt. Seas 9 ft.
.MON...NW wind 20 kt. Seas 9 ft.
.TUE...NE wind 20 kt. Seas 5 ft.

$$

PKZ165-230145-
Port Heiden to Cape Sarichef-
358 AM AKST Fri Dec 22 2017

...GALE WARNING THROUGH SATURDAY...

.TODAY...S wind 25 kt. From Port Moller E, SE wind 40 kt becoming
E 30 kt in the afternoon. Seas 13 ft.
.TONIGHT...NE wind 35 kt. Seas 12 ft. Rain and snow showers.
.SAT...N wind 45 kt except E 30 kt from Port Moller E. Seas 22 ft
except 12 ft from Port Moller E. Widespread snow showers.
.SAT NIGHT...NW wind 45 kt. Seas 22 ft.
.SUN...W wind 35 kt. Seas 17 ft.
.MON...N wind 20 kt. Seas 10 ft.
.TUE...NE wind 15 kt. Seas 7 ft.

$$

PKZ170-230145-
Cape Sarichef to Nikolski Bering Side-
358 AM AKST Fri Dec 22 2017

...GALE WARNING TONIGHT AND SATURDAY...

.TODAY...W wind 30 kt. Seas 12 ft building to 17 ft in the
afternoon. Snow showers.
.TONIGHT...NW wind 30 kt increasing to 40 kt after midnight. Seas
19 ft. Snow showers.
.SAT...NW wind 45 kt. Seas 21 ft.
.SAT NIGHT...NW wind 40 kt. Seas 20 ft.
.SUN...W wind 30 kt. Seas 13 ft.
.MON...NE wind 15 kt. Seas 10 ft.
.TUE...NE wind 15 kt. Seas 6 ft.

$$

PKZ171-230145-
Unalaska Bay-
358 AM AKST Fri Dec 22 2017

...GALE WARNING TONIGHT AND SATURDAY...

.TODAY...W wind 10 kt increasing to 20 kt in the morning. Seas 3 ft.
Snow.
.TONIGHT...NW wind 30 kt increasing to 40 kt after midnight. Seas 16
ft. Snow showers.
.SAT...NW wind 40 kt. Seas 19 ft. Snow showers.
.SAT NIGHT...NW wind 35 kt. Seas 16 ft.
.SUN...W wind 20 kt. Seas 3 ft.
.MON...N wind 10 kt. Seas 3 ft.
.TUE...NE wind 10 kt. Seas 3 ft.

$$

PKZ172-230145-
Cape Sarichef to Nikolski Pacific Side-
358 AM AKST Fri Dec 22 2017

...STORM WARNING SATURDAY...

.TODAY...W wind 30 kt. Seas 21 ft. Snow and rain showers.
.TONIGHT...NW wind 35 kt increasing to 45 kt after midnight. Seas
18 ft.
.SAT...NW wind 50 kt. Seas 19 ft.
.SAT NIGHT...W wind 45 kt. Seas 17 ft.
.SUN...W wind 25 kt. Seas 9 ft.
.MON THROUGH TUE...NE wind 20 kt. Seas 8 ft.

$$

PKZ173-230145-
Nikloski to Seguam Island Bering Side-
358 AM AKST Fri Dec 22 2017

...GALE WARNING THROUGH TONIGHT...

.TODAY...W wind 40 kt. Seas 21 ft. Snow showers.
.TONIGHT...NW wind 35 kt. Seas 19 ft.
.SAT...NW wind 30 kt becoming W 20 kt in the afternoon. Seas 16
ft.
.SAT NIGHT...W wind 20 kt. Seas 10 ft.
.SUN...W wind 25 kt. Seas 11 ft.
.MON...S wind 15 kt. Seas 9 ft.
.TUE...E wind 15 kt. Seas 8 ft.

$$

PKZ174-230145-
Nikolski to Seguam Island Pacific Side-
358 AM AKST Fri Dec 22 2017

...GALE WARNING THROUGH TONIGHT...

.TODAY...W wind 35 kt. Seas 21 ft. Snow showers.
.TONIGHT...NW wind 35 kt. Seas 19 ft.
.SAT...NW wind 30 kt. Seas 15 ft.
.SAT NIGHT...W wind 25 kt. Seas 10 ft.
.SUN...W wind 25 kt. Seas 12 ft.
.MON THROUGH TUE...E wind 20 kt. Seas 9 ft.

$$

PKZ175-230145-
Seguam Island to Adak Bering Side-
358 AM AKST Fri Dec 22 2017

...GALE WARNING TODAY...

.TODAY...NW wind 40 kt diminishing to 30 kt in the afternoon. Seas
21 ft.
.TONIGHT...W wind 25 kt. Seas 17 ft.
.SAT...W wind 25 kt. Seas 11 ft.
.SAT NIGHT...W wind 30 kt. Seas 14 ft.
.SUN...SW wind 25 kt. Seas 12 ft.
.MON...NE wind 15 kt. Seas 9 ft.
.TUE...E wind 25 kt. Seas 8 ft.

$$

PKZ176-230145-
Seguam Island to Adak Pacific Side-
358 AM AKST Fri Dec 22 2017

...SMALL CRAFT ADVISORY THROUGH SATURDAY...

.TODAY...NW wind 30 kt. Seas 18 ft. Snow showers.
.TONIGHT...NW wind 20 kt. Seas 14 ft.
.SAT...W wind 25 kt. Seas 10 ft.
.SAT NIGHT...W wind 25 kt. Seas 11 ft.
.SUN...SW wind 25 kt. Seas 11 ft.
.MON THROUGH TUE...E wind 20 kt. Seas 8 ft.

$$

PKZ177-230145-
Adak to Kiska-
358 AM AKST Fri Dec 22 2017

...SMALL CRAFT ADVISORY THROUGH SATURDAY...

.TODAY...NW wind 20 kt. Seas 14 ft. Rain and snow showers.
.TONIGHT...W wind 25 kt. Seas 11 ft. Freezing spray.
.SAT...W wind 30 kt. Seas 13 ft. Freezing spray.
.SAT NIGHT...W wind 30 kt. Seas 12 ft.
.SUN...W wind 30 kt. Seas 11 ft.
.MON...N wind 25 kt. Seas 10 ft.
.TUE...SE wind 30 kt. Seas 11 ft.

$$

PKZ178-230145-
Kiska to Attu-
358 AM AKST Fri Dec 22 2017

...GALE WARNING SATURDAY...

.TODAY...W wind 20 kt. Seas 10 ft. Rain and snow showers.
.TONIGHT...W wind 30 kt. Seas 12 ft. Freezing spray.
.SAT...W wind 30 kt becoming SW 40 kt in the afternoon. Seas 15
ft. Freezing spray.
.SAT NIGHT...W wind 40 kt. Seas 15 ft.
.SUN...NW wind 25 kt. Seas 9 ft.
.MON...SE wind 35 kt. Seas 11 ft.
.TUE...SE wind 40 kt. Seas 24 ft.

$$

PKZ179-230145-
Pribilof Islands Near Shore Waters-
358 AM AKST Fri Dec 22 2017

...GALE WARNING SATURDAY...

.TODAY...S wind 20 kt. Seas 12 ft.
.TONIGHT...NW wind 30 kt. Seas 15 ft.
.SAT...NW wind 35 kt. Seas 16 ft.
.SAT NIGHT...NW wind 30 kt. Seas 13 ft.
.SUN...W wind 30 kt. Seas 11 ft.
.MON...Variable wind 10 kt. Seas 10 ft.
.TUE...NE wind 15 kt. Seas 6 ft.

$$

PKZ180-230145-
Kuskokwim Delta and Etolin Strait-
358 AM AKST Fri Dec 22 2017

...STORM WARNING TODAY...

.TODAY...SE wind 55 kt. Seas 20 ft. Rain.
.TONIGHT...E wind 45 kt. Seas 14 ft. Rain.
.SAT...E wind 45 kt. Seas 14 ft. Rain and snow.
.SAT NIGHT...E wind 30 kt. Seas 12 ft.
.SUN...W wind 30 kt. Seas 13 ft.
.MON...W wind 25 kt. Seas 11 ft.
.TUE...NE wind 15 kt. Seas 6 ft.

$$

PKZ181-230145-
North and West of Nunivak Island-
358 AM AKST Fri Dec 22 2017

...STORM WARNING TODAY...

.TODAY...SE wind 50 kt. Seas 18 ft. Rain and snow.
.TONIGHT...SE wind 40 kt. Seas 12 ft. Snow and rain.
.SAT...E wind 30 kt. Seas 11 ft. Widespread snow showers and rain.
.SAT NIGHT...E wind 35 kt. Seas 12 ft.
.SUN...N wind 35 kt. Seas 12 ft.
.MON...W wind 20 kt. Seas 8 ft.
.TUE...N wind 15 kt. Seas 6 ft.

$$

PKZ185-230145-
Saint Matthew Island Waters-
358 AM AKST Fri Dec 22 2017

...GALE WARNING TODAY AND SATURDAY...

.TODAY...E wind 40 kt. Seas 17 ft. Snow and rain.
.TONIGHT...S wind 30 kt. Seas 15 ft. Freezing spray. Snow.
.SAT...NW wind 35 kt...except 25 kt W of Saint Matthew Island. Seas 
13 ft. Freezing spray.
.SAT NIGHT...NW wind 35 kt. Seas 12 ft.
.SUN...NW wind 30 kt. Seas 12 ft.
.MON...NW wind 15 kt. Seas 9 ft.
.TUE...E wind 20 kt. Seas 7 ft.

$$

371 
FZAK52 PAFC 230029
CWFALU

Coastal Waters Forecast
National Weather Service Anchorage Alaska
329 PM AKST Fri Dec 22 2017

Coastal Waters Forecast for Southwest Alaska+Bristol Bay+The
Alaska Peninsula Waters and the Aleutian Islands up to 100 nm out.

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.

PKZ199-231345-
329 PM AKST Fri Dec 22 2017
.SYNOPSIS FOR SOUTHWEST ALASKA+BRISTOL BAY+THE ALASKA
PENINSULA WATERS AND THE ALEUTIAN ISLANDS...
A 978 mb low 220 nm southwest of Gambell moves to the Gulf of 
Anadyr tonight. A second low enters the southeastern Bering 
tonight at 988 mb 180 nm east of Saint George and moves 80 nm east
of Gambell Sun afternoon at 1001 mb. A front remains nearly 
stationary along the eastern Bering through the forecast period. 
Another low approaches the western Aleutians Sun afternoon at 1007
mb. 

$$

PKZ150-231345-
South of the AK Peninsula Sitkinak to Castle Cape-
329 PM AKST Fri Dec 22 2017

...GALE WARNING THROUGH SATURDAY NIGHT...

.TONIGHT...E wind 45 kt. Seas 22 ft. Rain.
.SAT...E wind 40 kt. Seas 23 ft.
.SAT NIGHT...SE wind 35 kt. Seas 20 ft.
.SUN...S wind 35 kt. Seas 18 ft.
.SUN NIGHT...NW wind 35 kt. Seas 15 ft.
.MON...NW wind 30 kt. Seas 9 ft.
.TUE...NE wind 30 kt. Seas 12 ft.
.WED...NE wind 25 kt. Seas 14 ft.

$$

PKZ155-231345-
South of the AK Peninsula Castle Cape to Cape Sarichef-
329 PM AKST Fri Dec 22 2017

...STORM WARNING SATURDAY...

.TONIGHT...E wind 35 kt. Seas 20 ft. Rain and snow showers.
.SAT...NW wind 50 kt except E 30 kt from the Shumagin Islands E.
Seas 19 ft. Rain showers and snow showers.
.SAT NIGHT...NW wind 45 kt. From the Shumagin Islands E, SE wind
25 kt becoming NW 35 kt after midnight. Seas 18 ft. Snow showers
and rain showers.
.SUN...W wind 40 kt. Seas 16 ft.
.SUN NIGHT...W wind 30 kt. Seas 9 ft.
.MON THROUGH TUE...NE wind 30 kt. Seas 9 ft.
.WED...NE wind 20 kt. Seas 14 ft.

$$

PKZ160-231345-
Bristol Bay-
329 PM AKST Fri Dec 22 2017

...GALE WARNING THROUGH SATURDAY...

.TONIGHT...E wind 45 kt. Seas 11 ft.
.SAT...E wind 45 kt. Seas 12 ft.
.SAT NIGHT...E wind 30 kt. Seas 9 ft.
.SUN...E wind 30 kt. Seas 9 ft.
.SUN NIGHT...W wind 30 kt. Seas 9 ft.
.MON...W wind 20 kt. Seas 5 ft.
.TUE...NE wind 20 kt. Seas 4 ft.
.WED...NE wind 25 kt. Seas 7 ft.

$$

PKZ165-231345-
Port Heiden to Cape Sarichef-
329 PM AKST Fri Dec 22 2017

...GALE WARNING THROUGH SATURDAY NIGHT...

.TONIGHT...NE wind 35 kt. Seas 11 ft. Rain and snow showers.
.SAT...N wind 45 kt except E 30 kt from Port Moller E. Seas 19 ft
except 12 ft from Port Moller E. Snow showers.
.SAT NIGHT...NW wind 45 kt. From Port Moller E, E wind 30 kt
becoming W after midnight. Seas 19 ft except 16 ft from Port
Moller E. Snow showers.
.SUN...W wind 30 kt. Seas 15 ft.
.SUN NIGHT...W wind 25 kt. Seas 10 ft.
.MON...NW wind 20 kt. Seas 8 ft.
.TUE...NE wind 15 kt. Seas 7 ft.
.WED...NE wind 25 kt. Seas 11 ft.

$$

PKZ170-231345-
Cape Sarichef to Nikolski Bering Side-
329 PM AKST Fri Dec 22 2017

...GALE WARNING THROUGH SATURDAY NIGHT...

.TONIGHT...NW wind 30 kt increasing to 40 kt after midnight. Seas
18 ft. Snow showers.
.SAT...NW wind 45 kt. Seas 18 ft.
.SAT NIGHT...NW wind 40 kt. Seas 17 ft.
.SUN AND SUN NIGHT...W wind 25 kt. Seas 10 ft.
.MON...SE wind 25 kt. Seas 7 ft.
.TUE THROUGH WED...NE wind 15 kt. Seas 7 ft.

$$

PKZ171-231345-
Unalaska Bay-
329 PM AKST Fri Dec 22 2017

...GALE WARNING THROUGH SATURDAY NIGHT...

.TONIGHT...NW wind 40 kt. Seas 15 ft. Snow showers.
.SAT...NW wind 40 kt. Seas 16 ft. Snow showers.
.SAT NIGHT...NW wind 35 kt becoming W 25 kt after midnight. Seas
15 ft subsiding to 4 ft after midnight.
.SUN...W wind 15 kt. Seas 2 ft.
.SUN NIGHT...W wind 25 kt. Seas 4 ft.
.MON...SE wind 15 kt. Seas 2 ft.
.TUE...NE wind 15 kt. Seas 3 ft.
.WED...NE wind 10 kt. Seas 3 ft.

$$

PKZ172-231345-
Cape Sarichef to Nikolski Pacific Side-
329 PM AKST Fri Dec 22 2017

...STORM WARNING SATURDAY...

.TONIGHT...NW wind 35 kt increasing to 45 kt after midnight. Seas
18 ft.
.SAT...NW wind 50 kt. Seas 17 ft.
.SAT NIGHT...NW wind 45 kt becoming W 35 kt after midnight. Seas
15 ft.
.SUN...W wind 25 kt. Seas 10 ft.
.SUN NIGHT...W wind 20 kt. Seas 8 ft.
.MON...E wind 20 kt. Seas 8 ft.
.TUE...NE wind 25 kt. Seas 8 ft.
.WED...NE wind 15 kt. Seas 9 ft.

$$

PKZ173-231345-
Nikloski to Seguam Island Bering Side-
329 PM AKST Fri Dec 22 2017

...GALE WARNING TONIGHT...

.TONIGHT...NW wind 35 kt. Seas 18 ft.
.SAT...NW wind 30 kt becoming W 20 kt in the afternoon. Seas 15
ft.
.SAT NIGHT...W wind 20 kt increasing to 30 kt after midnight. Seas
9 ft.
.SUN...W wind 30 kt. Seas 12 ft.
.SUN NIGHT...SW wind 30 kt. Seas 11 ft.
.MON...SE wind 30 kt. Seas 11 ft.
.TUE...E wind 20 kt. Seas 10 ft.
.WED...E wind 15 kt. Seas 5 ft.

$$

PKZ174-231345-
Nikolski to Seguam Island Pacific Side-
329 PM AKST Fri Dec 22 2017

...GALE WARNING TONIGHT...

.TONIGHT...NW wind 35 kt. Seas 19 ft.
.SAT...NW wind 30 kt. Seas 14 ft.
.SAT NIGHT...W wind 30 kt. Seas 11 ft.
.SUN AND SUN NIGHT...SW wind 30 kt. Seas 12 ft.
.MON...SE wind 35 kt. Seas 13 ft.
.TUE...E wind 20 kt. Seas 10 ft.
.WED...E wind 15 kt. Seas 6 ft.

$$

PKZ175-231345-
Seguam Island to Adak Bering Side-
329 PM AKST Fri Dec 22 2017

...SMALL CRAFT ADVISORY THROUGH SATURDAY NIGHT...

.TONIGHT...W wind 25 kt. Seas 16 ft.
.SAT...W wind 25 kt. Seas 11 ft.
.SAT NIGHT...W wind 30 kt. Seas 11 ft.
.SUN...W wind 35 kt. Seas 14 ft.
.SUN NIGHT...S wind 40 kt. Seas 9 ft.
.MON...NE wind 40 kt. Seas 14 ft.
.TUE THROUGH WED...E wind 25 kt. Seas 9 ft.

$$

PKZ176-231345-
Seguam Island to Adak Pacific Side-
329 PM AKST Fri Dec 22 2017

...SMALL CRAFT ADVISORY THROUGH SATURDAY NIGHT...

.TONIGHT...NW wind 20 kt. Seas 14 ft.
.SAT...W wind 25 kt. Seas 11 ft.
.SAT NIGHT...W wind 30 kt. Seas 11 ft.
.SUN...W wind 30 kt. Seas 12 ft.
.SUN NIGHT...S wind 35 kt. Seas 13 ft.
.MON...N wind 45 kt. Seas 13 ft.
.TUE...E wind 20 kt. Seas 8 ft.
.WED...E wind 20 kt. Seas 12 ft.

$$

PKZ177-231345-
Adak to Kiska-
329 PM AKST Fri Dec 22 2017

...GALE WARNING SATURDAY NIGHT...

.TONIGHT...W wind 25 kt. Seas 12 ft. Freezing spray.
.SAT...W wind 30 kt. Seas 12 ft. Freezing spray.
.SAT NIGHT...W wind 35 kt. Seas 14 ft.
.SUN...SW wind 30 kt. Seas 12 ft.
.SUN NIGHT...NW wind 40 kt. Seas 10 ft.
.MON...N wind 35 kt. Seas 11 ft.
.TUE...SE wind 30 kt. Seas 11 ft.
.WED...SE wind 30 kt. Seas 22 ft.

$$

PKZ178-231345-
Kiska to Attu-
329 PM AKST Fri Dec 22 2017

...GALE WARNING SATURDAY AND SATURDAY NIGHT...

.TONIGHT...W wind 30 kt. Seas 12 ft. Freezing spray.
.SAT...W wind 30 kt becoming SW 40 kt in the afternoon. Seas 14
ft. Freezing spray.
.SAT NIGHT...W wind 40 kt diminishing to 25 kt after midnight.
Seas 15 ft.
.SUN AND SUN NIGHT...NW wind 25 kt. Seas 9 ft.
.MON...NE wind 25 kt. Seas 8 ft.
.TUE THROUGH WED...SE wind 40 kt. Seas 26 ft.

$$

PKZ179-231345-
Pribilof Islands Near Shore Waters-
329 PM AKST Fri Dec 22 2017

...GALE WARNING SATURDAY...

.TONIGHT...NW wind 30 kt. Seas 15 ft.
.SAT...NW wind 35 kt. Seas 15 ft.
.SAT NIGHT...NW wind 30 kt. Seas 12 ft.
.SUN...N wind 15 kt. Seas 8 ft.
.SUN NIGHT...SE wind 15 kt. Seas 8 ft.
.MON...S wind 20 kt. Seas 9 ft.
.TUE THROUGH WED...NE wind 20 kt. Seas 7 ft.

$$

PKZ180-231345-
Kuskokwim Delta and Etolin Strait-
329 PM AKST Fri Dec 22 2017

...GALE WARNING THROUGH SATURDAY...

.TONIGHT...E wind 45 kt. Seas 13 ft. Rain and snow.
.SAT...E wind 45 kt. Seas 14 ft. Rain.
.SAT NIGHT...E wind 30 kt. Seas 13 ft. Snow showers.
.SUN...W wind 30 kt. Seas 11 ft.
.SUN NIGHT...NW wind 25 kt. Seas 8 ft.
.MON...W wind 20 kt. Seas 7 ft.
.TUE...NE wind 15 kt. Seas 5 ft.
.WED...NE wind 20 kt. Seas 7 ft.

$$

PKZ181-231345-
North and West of Nunivak Island-
329 PM AKST Fri Dec 22 2017

...GALE WARNING TONIGHT AND SATURDAY NIGHT...

.TONIGHT...SE wind 40 kt. Seas 11 ft. Snow and rain.
.SAT...E wind 30 kt. Seas 11 ft. Snow showers and rain.
.SAT NIGHT...E wind 35 kt. Seas 12 ft. Freezing spray. Snow
showers.
.SUN...NW wind 30 kt. Seas 10 ft.
.SUN NIGHT...NW wind 20 kt. Seas 7 ft.
.MON...W wind 20 kt. Seas 8 ft.
.TUE THROUGH WED...NE wind 15 kt. Seas 6 ft.

$$

PKZ185-231345-
Saint Matthew Island Waters-
329 PM AKST Fri Dec 22 2017

...GALE WARNING SATURDAY AND SATURDAY NIGHT...

.TONIGHT...S wind 30 kt. Seas 14 ft. Freezing spray. Snow.
.SAT...NW wind 35 kt E of Saint Matthew Island...W 30 kt W of
Saint Matthew Island. Seas 12 ft. Freezing spray.
.SAT NIGHT...NW wind 35 kt. Seas 10 ft. Freezing spray.
.SUN...NW wind 30 kt. Seas 10 ft.
.SUN NIGHT...SE wind 25 kt. Seas 9 ft.
.MON...NW wind 25 kt. Seas 10 ft.
.TUE THROUGH WED...E wind 20 kt. Seas 7 ft.

$$

Southcentral and Southwest Alaska Forecast Discussion
National Weather Service Anchorage AK
518 AM AKST Thu Dec 21 2017

.ANALYSIS AND UPPER LEVELS...
Broad troughing remains over the western Bering Sea while the
active portion of the jet stream is well south of the Aleutians. A
sharp trough sits south of the central/eastern Aleutians at the
leading edge of the east Asian jet protruding into the northern
Pacific. Ahead of this trough, there are two features of interest
with regards to the upcoming forecast, the first a broad upper
level ridge extending across most of the southern mainland, and a
closed off low spinning toward the northern Pacific/western Gulf
of Alaska. The upper low is beginning to phase into the
approaching Bering trough.

Surface high pressure sits over the Gulf of Alaska helping to
create areas of fog and low clouds around the Cook Inlet region.
Surface low pressure centers sit over the central Bering Sea
creating a tight pressure gradient and gusty winds from the
eastern Aleutians through the southwest Mainland.

&&

.MODEL DISCUSSION...
Guidance continues to have a good handle on the synoptics of the
pattern, but struggle a bit with phasing of the Pacific system
into the Bering Sea trough. All guidance phases the system, but
how much and exactly where the resultant surface low sets up are
still in question.

&&

.AVIATION...
PANC...Generally VFR conditions and light winds will persist.
Fog/low stratus will be an issue early this morning around Knik
Arm but should be pushed away by increasing southeast winds off
the surface as the morning progresses.

&&

.SHORT TERM FORECAST SOUTHCENTRAL ALASKA (Days 1 and 2)...
The upper level ridge is building over Southcentral Alaska
through the Alcan border today. This ridge will persist for a few
days keeping a rather stable pattern over the area. There will be
the threat of fog over inland areas and the Cook Inlet region with
the warm air aloft and otherwise clear skies.

For the western Gulf of Alaska and Kodiak this pattern will bring
in a persistent frontal zone with strong winds and rain. When this
rain and wind moves into the area later today, it will persist
into Saturday night before really tapering off.

Marine areas will see widespread Gale and Storm force winds with
seas building to the 20 to 30 ft range.

&&

.SHORT TERM FORECAST SOUTHWEST ALASKA (Days 1 through 3)...
Clouds and southeasterly winds will continue to increase today
ahead of storm force low currently tracking from the North Pacific
towards the AK pen. This system will take a slightly more
westerly track into the Central Bering than initially projected,
which should help prevent high winds from spreading throughout all
of Bristol Bay. There is however good confidence that this system
will bring high wind gusts to the downslope and gap wind prone
areas along the Aleutian Range, including into the King Salmon and
Iliamna areas by late tonight, so the High Wind Watch was upgraded
to a warning. Further north over the Kuskokwim Delta this low
will also bring strong winds to the coast, along with a brief
round of snow/blowing snow before strong warm air advection
switches most of the area to rain and well above freezing by
Friday afternoon. The one exception to this rule will be for the
lower Kuskokwim Valley which will only see a glancing blow from
the front and allow for temperatures to remain cold enough to
support snow. Most of the snowfall should generally be limited to
the Aniak area and likely as a rain/snow mix, while cooler areas
to the east should only expect showers to pass through and minimal
accumulations.

A broad trough will then bring continued active weather to the
region into Saturday as another gale-storm force North Pacific low
quickly replaces it. The good news from this second system is
that the models have all trended weaker and further west with
it's low position, so there no longer looks to be the potential
for a multi-day high wind event for Bristol Bay as thought
yesterday. There is however good confidence that strong and gusty
winds will continue through Saturday with rains away from
downslope prone areas and well above normal temperatures.

&&

.SHORT TERM FORECAST BERING SEA/ALEUTIANS (Days 1 through 3)...
The broad trough that has now shifted to the Western Bering will
bring continued active weather from the Central Bering eastward
into this weekend. The first system will bring storm force winds
and rain to the AK pen/Eastern Bering by this afternoon, with
widespread gale force winds expected in the northwesterly flow
behind it. There will also be strong cold air advection along with
the NW flow, which should provide enough cold air to bring
accumulating snow down to sea level from the Dutch Harbor area
westward. Temperatures should remain near-above freezing in most
of these areas, limiting the blowing snow potential. This pattern
will then hold into Saturday as another gale to potentially storm
force North Pacific low takes a very similar northerly track into
the Eastern Bering.

&&

.LONG TERM FORECAST (Friday through Tuesday)...
By Friday, southern Alaska will be in the thick of things
weather-wise, with a low pressure system in the northern Bering
and another one close on its heels south of the AK Pen. This will
bring a strong series of fronts through Southwest Alaska, and
Bristol Bay and the Bering side of the AK Pen can expect some very
windy conditions. Precipitation on the Pacific side of the AK Pen
and Kodiak Island will also be significant, although not as much
as initially shown several days ago. On the western or backside of
these low pressure systems, some strong cold air advection will
move into the Pribilofs and Eastern Aleutians, which will bring
some heavy snow showers and possible blowing snow through Saturday
night.

On Saturday, the ridge holding those lows in place will weaken,
allowing the front over Kodiak to slide eastward and bring
precipitation to the southern Kenai peninsula. A secondary low is
forecast to form just south of the Kenai and move into the Gulf of
Alaska, which should keep down-inlet flow for Southcentral and
keep the weekend cool. Unfortunately, this northerly flow looks to
remain pretty dry, decreasing any chances of snow for the
northern portions of Southcentral. Tuesday looks like it will
clear out over most of the mainland. By Wednesday, the forecast
models are struggling to agree on a solution. Currently, the GFS,
EC and Canadian agree on bringing a strong low up toward the AK
Pen from the north Pacific. However, previous runs have shown
significantly different solutions, so confidence in the day 7
forecast is low. &&

.AFC WATCHES/WARNINGS/ADVISORIES...
PUBLIC...High Wind Warning 161
MARINE...Gale 119 120 136 137 138 139 141 170 171 172 173 174 175 176
              177 178 179 181 185
         Storm 130 131 132 150 155 160 165 180.

&&

SYNOPSIS AND MODEL DISCUSSION...MTL
SOUTHCENTRAL ALASKA...EZ
SOUTHWEST ALASKA/BERING SEA/ALEUTIANS...DEK
LONG TERM...LF