Gale Warning 748, NWS Anchorage, AK

621 
FZAK52 PAFC 220028
CWFALU

Coastal Waters Forecast
National Weather Service Anchorage Alaska
328 PM AKST Thu Dec 21 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.

PKZ199-221315-
328 PM AKST Thu Dec 21 2017
.SYNOPSIS FOR SOUTHWEST ALASKA+BRISTOL BAY+THE ALASKA
PENINSULA WATERS AND THE ALEUTIAN ISLANDS...
A 976 mb low crosses over the AKPEN and into the Bering this 
afternoon and moves 250 nm southwest of Hooper Bay at 975 mb Fri 
morning. The low then moves north over Kamchatka. A front 
associated with a low in the western Gulf extends across the 
eastern Bering Fri morning through Sat afternoon.

$$

PKZ150-221315-
South of the AK Peninsula Sitkinak to Castle Cape-
328 PM AKST Thu Dec 21 2017

...STORM WARNING TONIGHT...

.TONIGHT...E wind 55 kt. Seas 33 ft. Rain.
.FRI...SE wind 45 kt. Seas 27 ft. Rain.
.FRI NIGHT...E wind 40 kt. Seas 22 ft. Rain.
.SAT...E wind 35 kt. Seas 22 ft.
.SAT NIGHT...SE wind 30 kt. Seas 18 ft.
.SUN...SW wind 30 kt. Seas 21 ft.
.MON...NW wind 15 kt. Seas 8 ft.
.TUE...NE wind 20 kt. Seas 16 ft.

$$

PKZ155-221315-
South of the AK Peninsula Castle Cape to Cape Sarichef-
328 PM AKST Thu Dec 21 2017

...STORM WARNING TONIGHT...

.TONIGHT...E wind 40 kt becoming SE 30 kt after midnight. From the
Shumagin Islands E, E wind 50 kt. Seas 25 ft except 32 ft from the
Shumagin Islands E. Rain.
.FRI...S wind 30 kt except E 35 kt from the Shumagin Islands E.
Seas 23 ft. Rain.
.FRI NIGHT...NE wind 30 kt becoming N 40 kt after midnight. From
the Shumagin Islands E, E wind 35 kt diminishing to 25 kt after 
midnight. Seas 19 ft. Rain showers and snow showers.
.SAT...N wind 40 kt. Seas 20 ft.
.SAT NIGHT...W wind 40 kt. Seas 21 ft.
.SUN...W wind 30 kt. Seas 22 ft.
.MON...N wind 20 kt. Seas 8 ft.
.TUE...NE wind 20 kt. Seas 17 ft.

$$

PKZ160-221315-
Bristol Bay-
328 PM AKST Thu Dec 21 2017

...STORM WARNING THROUGH FRIDAY...

.TONIGHT...E wind 55 kt. Seas 15 ft.
.FRI...E wind 50 kt. Seas 14 ft.
.FRI NIGHT...E wind 40 kt. Seas 11 ft.
.SAT...E wind 35 kt. Seas 10 ft.
.SAT NIGHT...SE wind 25 kt. Seas 6 ft.
.SUN...S wind 20 kt. Seas 7 ft.
.MON...W wind 15 kt. Seas 5 ft.
.TUE...NE wind 15 kt. Seas 4 ft.

$$

PKZ165-221315-
Port Heiden to Cape Sarichef-
328 PM AKST Thu Dec 21 2017

...STORM WARNING TONIGHT...

.TONIGHT...E wind 40 kt except E 50 kt from Port Moller E. Seas
15 ft. Rain.
.FRI...SE wind 40 kt. Seas 13 ft.
.FRI NIGHT...E wind 35 kt. Seas 12 ft. Rain showers.
.SAT...N wind 40 kt. Seas 22 ft.
.SAT NIGHT...SW wind 40 kt. Seas 17 ft.
.SUN...W wind 25 kt. Seas 12 ft.
.MON...N wind 15 kt. Seas 6 ft.
.TUE...NE wind 15 kt. Seas 8 ft.

$$

PKZ170-221315-
Cape Sarichef to Nikolski Bering Side-
328 PM AKST Thu Dec 21 2017

...GALE WARNING FRIDAY AND FRIDAY NIGHT...

.TONIGHT...E wind 25 kt becoming SW after midnight. Seas 10 ft.
Rain with snow showers.
.FRI...W wind 40 kt except SW 15 kt from Unalaska E. Seas 17 ft.
Snow showers.
.FRI NIGHT...NW wind 35 kt. Seas 19 ft. Snow showers and rain
showers.
.SAT AND SAT NIGHT...W wind 35 kt. Seas 21 ft.
.SUN...W wind 30 kt. Seas 21 ft.
.MON...N wind 15 kt. Seas 8 ft.
.TUE...NE wind 15 kt. Seas 7 ft.

$$

PKZ171-221315-
Unalaska Bay-
328 PM AKST Thu Dec 21 2017

...SMALL CRAFT ADVISORY FRIDAY NIGHT...

.TONIGHT...NE wind 10 kt becoming W after midnight. Seas 3 ft.
Rain showers with snow showers.
.FRI...W wind 20 kt. Seas 2 ft. Snow showers.
.FRI NIGHT...NW wind 30 kt. Seas 5 ft building to 13 ft after
midnight. Snow showers.
.SAT AND SAT NIGHT...W wind 30 kt. Seas 15 ft.
.SUN...W wind 30 kt. Seas 4 ft.
.MON...N wind 10 kt. Seas 3 ft.
.TUE...NE wind 10 kt. Seas 3 ft.

$$

PKZ172-221315-
Cape Sarichef to Nikolski Pacific Side-
328 PM AKST Thu Dec 21 2017

...GALE WARNING FRIDAY AND FRIDAY NIGHT...

.TONIGHT...N wind 30 kt. Seas 19 ft. Rain.
.FRI...W wind 40 kt. Seas 21 ft. Rain showers and snow showers.
.FRI NIGHT...NW wind 35 kt. Seas 19 ft. Snow and rain showers.
.SAT AND SAT NIGHT...W wind 35 kt. Seas 16 ft.
.SUN...W wind 30 kt. Seas 14 ft.
.MON...N wind 15 kt. Seas 7 ft.
.TUE...NE wind 20 kt. Seas 13 ft.

$$

PKZ173-221315-
Nikloski to Seguam Island Bering Side-
328 PM AKST Thu Dec 21 2017

...GALE WARNING THROUGH FRIDAY NIGHT...

.TONIGHT...W wind 30 kt increasing to 45 kt after midnight. Seas
16 ft. Snow showers and rain showers.
.FRI...W wind 45 kt. Seas 22 ft. Snow showers.
.FRI NIGHT...NW wind 35 kt. Seas 19 ft.
.SAT AND SAT NIGHT...W wind 25 kt. Seas 13 ft.
.SUN...W wind 25 kt. Seas 17 ft.
.MON...Variable wind 10 kt. Seas 9 ft.
.TUE...E wind 15 kt. Seas 6 ft.

$$

PKZ174-221315-
Nikolski to Seguam Island Pacific Side-
328 PM AKST Thu Dec 21 2017

...GALE WARNING THROUGH FRIDAY NIGHT...

.TONIGHT...W wind 30 kt increasing to 40 kt after midnight. Seas
20 ft. Snow and rain showers.
.FRI...W wind 45 kt. Seas 23 ft. Snow showers.
.FRI NIGHT...NW wind 35 kt. Seas 20 ft.
.SAT AND SAT NIGHT...W wind 25 kt. Seas 13 ft.
.SUN...W wind 25 kt. Seas 15 ft.
.MON...Variable wind 10 kt. Seas 7 ft.
.TUE...NE wind 15 kt. Seas 7 ft.

$$

PKZ175-221315-
Seguam Island to Adak Bering Side-
328 PM AKST Thu Dec 21 2017

...GALE WARNING THROUGH FRIDAY...

.TONIGHT...NW wind 45 kt. Seas 18 ft.
.FRI...NW wind 45 kt. Seas 21 ft.
.FRI NIGHT...W wind 30 kt diminishing to 20 kt after midnight.
Seas 18 ft. Freezing spray.
.SAT...S wind 20 kt. Seas 9 ft.
.SAT NIGHT...W wind 25 kt. Seas 11 ft.
.SUN...W wind 25 kt. Seas 12 ft.
.MON...S wind 15 kt. Seas 7 ft.
.TUE...E wind 20 kt. Seas 6 ft.

$$

PKZ176-221315-
Seguam Island to Adak Pacific Side-
328 PM AKST Thu Dec 21 2017

...GALE WARNING THROUGH FRIDAY...

.TONIGHT...NW wind 30 kt increasing to 40 kt after midnight. Seas
20 ft. Snow showers.
.FRI...NW wind 40 kt. Seas 19 ft.
.FRI NIGHT...W wind 25 kt diminishing to 15 kt after midnight.
Seas 18 ft subsiding to 13 ft after midnight. Freezing spray.
.SAT...SW wind 30 kt. Seas 10 ft.
.SAT NIGHT...W wind 30 kt. Seas 11 ft.
.SUN...W wind 25 kt. Seas 11 ft.
.MON...SE wind 15 kt. Seas 8 ft.
.TUE...E wind 20 kt. Seas 7 ft.

$$

PKZ177-221315-
Adak to Kiska-
328 PM AKST Thu Dec 21 2017

...SMALL CRAFT ADVISORY THROUGH FRIDAY NIGHT...

.TONIGHT...NW wind 30 kt. Seas 14 ft Bering side... 21 ft Pacific 
side.
.FRI...NW wind 20 kt. Seas 15 ft.
.FRI NIGHT...SW wind 20 kt. Seas 10 ft. Freezing spray.
.SAT AND SAT NIGHT...W wind 25 kt. Seas 12 ft.
.SUN...W wind 25 kt. Seas 11 ft.
.MON...N wind 20 kt. Seas 9 ft.
.TUE...SE wind 30 kt. Seas 18 ft.

$$

PKZ178-221315-
Kiska to Attu-
328 PM AKST Thu Dec 21 2017

...SMALL CRAFT ADVISORY THROUGH FRIDAY NIGHT...

.TONIGHT...NW wind 25 kt becoming W 15 kt after midnight. Seas
15 ft.
.FRI...W wind 15 kt increasing to 25 kt in the afternoon. Seas
10 ft.
.FRI NIGHT...W wind 25 kt. Seas 12 ft. Freezing spray.
.SAT...W wind 30 kt. Seas 12 ft.
.SAT NIGHT...W wind 40 kt. Seas 13 ft.
.SUN...W wind 25 kt. Seas 10 ft.
.MON...SE wind 30 kt. Seas 11 ft.
.TUE...SE wind 35 kt. Seas 25 ft.

$$

PKZ179-221315-
Pribilof Islands Near Shore Waters-
328 PM AKST Thu Dec 21 2017

...SMALL CRAFT ADVISORY THROUGH FRIDAY NIGHT...

.TONIGHT...E wind 30 kt diminishing to 20 kt after midnight. Seas
15 ft. Rain.
.FRI...Variable wind 10 kt. Seas 12 ft.
.FRI NIGHT...W wind 25 kt. Seas 15 ft. Snow showers.
.SAT...NW wind 30 kt. Seas 12 ft.
.SAT NIGHT...NW wind 30 kt. Seas 16 ft.
.SUN...W wind 30 kt. Seas 16 ft.
.MON...Variable wind 10 kt. Seas 9 ft.
.TUE...N wind 15 kt. Seas 5 ft.

$$

PKZ180-221315-
Kuskokwim Delta and Etolin Strait-
328 PM AKST Thu Dec 21 2017

...STORM WARNING THROUGH FRIDAY...

.TONIGHT...E wind 55 kt. Seas 20 ft. Rain and snow.
.FRI...SE wind 55 kt. Seas 20 ft. Rain.
.FRI NIGHT...SE wind 40 kt. Seas 15 ft. Rain.
.SAT...E wind 35 kt. Seas 12 ft.
.SAT NIGHT...SE wind 30 kt. Seas 8 ft.
.SUN...NW wind 20 kt. Seas 6 ft.
.MON...W wind 15 kt. Seas 6 ft.
.TUE...NE wind 15 kt. Seas 5 ft.

$$

PKZ181-221315-
North and West of Nunivak Island-
328 PM AKST Thu Dec 21 2017

...GALE WARNING THROUGH FRIDAY NIGHT...

.TONIGHT...SE wind 40 kt. Seas 16 ft. Snow and rain.
.FRI...SE wind 45 kt. Seas 17 ft. Rain and snow.
.FRI NIGHT...SE wind 40 kt. Seas 13 ft. Snow and rain.
.SAT...N wind 30 kt. Seas 11 ft.
.SAT NIGHT...E wind 30 kt. Seas 8 ft.
.SUN...N wind 15 kt. Seas 8 ft.
.MON...W wind 15 kt. Seas 8 ft.
.TUE...Variable wind 10 kt. Seas 5 ft.

$$

PKZ185-221315-
Saint Matthew Island Waters-
328 PM AKST Thu Dec 21 2017

...GALE WARNING THROUGH FRIDAY...

.TONIGHT...E wind 35 kt. Seas 17 ft. Freezing spray. Snow.
.FRI...NE wind 40 kt. Seas 17 ft. Snow and rain.
.FRI NIGHT...SW wind 30 kt. Seas 15 ft. Freezing spray. Snow.
.SAT...W wind 25 kt. Seas 16 ft.
.SAT NIGHT...NW wind 25 kt. Seas 10 ft.
.SUN...NW wind 25 kt. Seas 10 ft.
.MON...NW wind 15 kt. Seas 9 ft.
.TUE...E wind 20 kt. Seas 5 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