Small Craft Advisory 744, NWS Anchorage, AK

481 
FZAK52 PAFC 212355
CWFALU

Coastal Waters Forecast
National Weather Service Anchorage Alaska
355 PM AKDT Tue Sep 21 2021

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.

PKZ199-221245-
355 PM AKDT Tue Sep 21 2021

.SYNOPSIS FOR SOUTHWEST ALASKA+BRISTOL BAY+THE ALASKA
PENINSULA WATERS AND THE ALEUTIAN ISLANDS...

Semisopochnoi Volcano 140 nm west of Adak is currently active.

A 977 mb low 310 nm south of Adak weakens and elongates as it 
moves to 230 nm south of Sand Point at 988 mb for Wed afternoon. 
This low strengthens as it continues to 160 nm south of Seward at 
977 mb for Thu afternoon. Its front sweeps along the Aleutians and
Alaska Peninsula then reaches the North Gulf Coast by Thu 
afternoon.

$$

PKZ150-221245-
South of the AK Peninsula Sitkinak to Castle Cape-
355 PM AKDT Tue Sep 21 2021

...GALE WARNING WEDNESDAY NIGHT...

.TONIGHT...W wind 20 kt. Seas 5 ft.
.WED...SE wind 20 kt becoming E 30 kt in the afternoon. Seas 8 ft
building to 11 ft after midnight. Rain.
.WED NIGHT...NE wind 35 kt. Seas 13 ft. Rain.
.THU AND THU NIGHT...NW wind 40 kt. Seas 16 ft.
.FRI...W wind 30 kt. Seas 11 ft.
.SAT...E wind 25 kt. Seas 7 ft.
.SUN...NW wind 35 kt. Seas 10 ft.

$$

PKZ155-221245-
South of the AK Peninsula Castle Cape to Cape Sarichef-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY THROUGH WEDNESDAY NIGHT...

.TONIGHT...E wind 10 kt in the evening increasing to 25 kt. Seas 
5 ft building to 8 ft after midnight.
.WED...E wind 30 kt. Seas 8 ft building to 12 ft in the afternoon. 
Rain.
.WED NIGHT...N wind 30 kt. Seas 14 ft.
.THU AND THU NIGHT...NW wind 30 kt. Seas 14 ft.
.FRI...SW wind 25 kt. Seas 8 ft.
.SAT...N wind 40 kt. Seas 12 ft.
.SUN...NW wind 40 kt. Seas 12 ft.

$$

PKZ160-221245-
Bristol Bay-
355 PM AKDT Tue Sep 21 2021

.TONIGHT...NW wind 10 kt in the evening becoming variable less
than 10 kt. Seas 2 ft.
.WED...SE wind 10 kt becoming NE in the afternoon. Seas 4 ft.
.WED NIGHT...N wind 20 kt. Seas 6 ft.
.THU AND THU NIGHT...NW wind 30 kt. Seas 10 ft.
.FRI...W wind 25 kt. Seas 9 ft.
.SAT...NE wind 30 kt. Seas 7 ft.
.SUN...NW wind 30 kt. Seas 9 ft.

$$

PKZ165-221245-
Port Heiden to Cape Sarichef-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY WEDNESDAY AND WEDNESDAY NIGHT...

.TONIGHT...NE wind 20 kt. Seas 5 ft.
.WED...NE wind 25 kt except NE 20 kt from Port Moller E. Seas 7 ft.
.WED NIGHT...N wind 30 kt. Seas 7 ft building to 12 ft after
midnight.
.THU AND THU NIGHT...NW wind 30 kt. Seas 13 ft.
.FRI...W wind 25 kt. Seas 6 ft.
.SAT...N wind 35 kt. Seas 7 ft.
.SUN...NW wind 35 kt. Seas 9 ft.

$$

PKZ170-221245-
Cape Sarichef to Nikolski Bering Side-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY THROUGH WEDNESDAY NIGHT...

.TONIGHT...E 15 kt turning NE wind 30 kt after midnight. Seas 5 ft in
the evening building to 8 ft.
.WED...NE wind 30 kt. Seas 10 ft.
.WED NIGHT...N wind 30 kt. Seas 14 ft.
.THU...NW wind 25 kt. Seas 14 ft.
.THU NIGHT...SW wind 15 kt. Seas 9 ft.
.FRI...S wind 25 kt. Seas 8 ft.
.SAT THROUGH SUN...W wind 35 kt. Seas 12 ft.

$$

PKZ171-221245-
Unalaska Bay-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY THROUGH WEDNESDAY NIGHT...

.TONIGHT...E wind 25 kt. Seas 3 ft.
.WED...NE wind 20 kt increasing to 30 kt in the afternoon. Seas 6 ft 
building to 9 ft in the afternoon.
.WED NIGHT...N wind 30 kt. Seas 10 ft.
.THU...NW wind 25 kt. Seas 10 ft.
.THU NIGHT...W wind 15 kt. Seas 2 ft.
.FRI...E wind 20 kt. Seas 3 ft.
.SAT THROUGH SUN...W wind 30 kt. Seas 4 ft.

$$

PKZ172-221245-
Cape Sarichef to Nikolski Pacific Side-
355 PM AKDT Tue Sep 21 2021

...GALE WARNING THROUGH WEDNESDAY...

.TONIGHT...E wind 35 kt. Seas 11 ft.
.WED...NE wind 35 kt. Seas 14 ft.
.WED NIGHT...N wind 30 kt. Seas 14 ft.
.THU...NW wind 30 kt. Seas 12 ft.
.THU NIGHT...W wind 20 kt. Seas 9 ft.
.FRI...E wind 30 kt. Seas 7 ft.
.SAT THROUGH SUN...NW wind 40 kt. Seas 10 ft.

$$

PKZ173-221245-
Nikolski to Seguam Island Bering Side-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY THROUGH WEDNESDAY NIGHT...

.TONIGHT...E wind 30 kt. Seas 11 ft.
.WED...NE wind 30 kt. Seas 12 ft.
.WED NIGHT...N wind 25 kt. Seas 11 ft.
.THU...NW wind 15 kt. Seas 10 ft.
.THU NIGHT...SW wind 15 kt. Seas 7 ft.
.FRI...NW wind 25 kt. Seas 5 ft.
.SAT THROUGH SUN...W wind 30 kt. Seas 10 ft.

$$

PKZ174-221245-
Nikolski to Seguam Island Pacific Side-
355 PM AKDT Tue Sep 21 2021

...GALE WARNING THROUGH WEDNESDAY...

.TONIGHT...E wind 40 kt. Seas 15 ft. Rain.
.WED...NE wind 40 kt diminishing to 30 kt in the afternoon. Seas
17 ft.
.WED NIGHT...N wind 30 kt. Seas 15 ft.
.THU...NW wind 20 kt. Seas 11 ft.
.THU NIGHT...SW wind 15 kt. Seas 7 ft.
.FRI...NW wind 30 kt. Seas 8 ft.
.SAT...NW wind 35 kt. Seas 10 ft.
.SUN...W wind 30 kt. Seas 9 ft.

$$

PKZ175-221245-
Seguam Island to Adak Bering Side-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY THROUGH WEDNESDAY NIGHT...

.TONIGHT...NE wind 30 kt. Seas 11 ft.
.WED...NE wind 30 kt. Seas 12 ft.
.WED NIGHT...N wind 20 kt. Seas 10 ft.
.THU AND THU NIGHT...W wind 15 kt. Seas 8 ft.
.FRI...W wind 30 kt. Seas 6 ft.
.SAT...NW wind 30 kt. Seas 10 ft.
.SUN...W wind 25 kt. Seas 9 ft.

$$

PKZ176-221245-
Seguam Island to Adak Pacific Side-
355 PM AKDT Tue Sep 21 2021

...GALE WARNING THROUGH WEDNESDAY...

.TONIGHT...NE wind 40 kt. Seas 17 ft.
.WED...NE wind 35 kt. Seas 17 ft.
.WED NIGHT...N wind 25 kt diminishing to 15 kt after midnight.
Seas 12 ft.
.THU AND THU NIGHT...SW wind 15 kt. Seas 8 ft.
.FRI...W wind 30 kt. Seas 10 ft.
.SAT...NW wind 35 kt. Seas 10 ft.
.SUN...W wind 25 kt. Seas 12 ft.

$$

PKZ177-221245-
Adak to Kiska-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY THROUGH WEDNESDAY NIGHT...

.TONIGHT...NE wind 30 kt. Seas 12 ft.
.WED...NE wind 25 kt. Seas 11 ft.
.WED NIGHT...N wind 15 kt in the evening becoming variable 10 kt.
Seas 9 ft.
.THU AND THU NIGHT...W wind 15 kt. Seas 6 ft.
.FRI THROUGH SAT...W wind 30 kt. Seas 10 ft.
.SUN...SW wind 20 kt. Seas 10 ft.

$$

PKZ178-221245-
Kiska to Attu-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY THROUGH WEDNESDAY...

.TONIGHT...NE wind 20 kt. Seas 9 ft.
.WED...E wind 15 kt. Seas 9 ft.
.WED NIGHT...S wind 15 kt. Seas 7 ft.
.THU...Variable wind 10 kt. Seas 6 ft.
.THU NIGHT...Variable wind 10 kt. Seas 5 ft.
.FRI...NW wind 25 kt. Seas 9 ft.
.SAT...SW wind 20 kt. Seas 8 ft.
.SUN...S wind 20 kt. Seas 10 ft.

$$

PKZ179-221245-
Pribilof Islands Near Shore Waters-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY WEDNESDAY AND WEDNESDAY NIGHT...

.TONIGHT...E wind 15 kt. Seas 4 ft.
.WED...NE wind 25 kt. Seas 9 ft.
.WED NIGHT...N wind 25 kt. Seas 10 ft.
.THU...NW wind 20 kt. Seas 9 ft.
.THU NIGHT...Variable wind 10 kt. Seas 5 ft.
.FRI...SE wind 15 kt. Seas 5 ft.
.SAT...NW wind 30 kt. Seas 9 ft.
.SUN...W wind 25 kt. Seas 9 ft.

$$

PKZ180-221245-
Kuskokwim Delta and Etolin Strait-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY THROUGH WEDNESDAY NIGHT...

.TONIGHT...NW wind 10 kt in the evening increasing to 25 kt. 
Seas 3 ft building to 6 ft after midnight.
.WED...N wind 25 kt. Seas 7 ft.
.WED NIGHT...N wind 30 kt. Seas 8 ft.
.THU AND THU NIGHT...NW wind 30 kt. Seas 9 ft.
.FRI...W wind 15 kt. Seas 4 ft.
.SAT...N wind 30 kt. Seas 6 ft.
.SUN...NW wind 30 kt. Seas 7 ft.

$$

PKZ181-221245-
North and West of Nunivak Island-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY THROUGH WEDNESDAY NIGHT...

.TONIGHT...SW wind 30 kt in the evening becoming NW. Seas 8 ft.
.WED...N wind 25 kt. Seas 9 ft.
.WED NIGHT...N wind 25 kt. Seas 8 ft.
.THU...N wind 20 kt. Seas 7 ft.
.THU NIGHT...NW wind 15 kt. Seas 6 ft.
.FRI...SW wind 15 kt. Seas 5 ft.
.SAT THROUGH SUN...NW wind 25 kt. Seas 6 ft.

$$

PKZ185-221245-
Saint Matthew Island Waters-
355 PM AKDT Tue Sep 21 2021

...SMALL CRAFT ADVISORY WEDNESDAY...

.TONIGHT...N wind 20 kt. Seas 7 ft.
.WED...N wind 25 kt E of Saint Matthew Island...NE 20 kt W of Saint 
Matthew Island. Seas 8 ft.
.WED NIGHT...E of Saint Matthew Island, N wind 20 kt. W of Saint
Matthew Island, N wind 15 kt in the evening becoming variable 10 kt.
Seas 7 ft.
.THU AND THU NIGHT...SW wind 20 kt. Seas 5 ft.
.FRI THROUGH SAT...NW wind 25 kt. Seas 10 ft.
.SUN...W wind 20 kt. Seas 6 ft.

$$

222 
FZAK52 PAFC 221151
CWFALU

Coastal Waters Forecast
National Weather Service Anchorage Alaska
351 AM AKDT Wed Sep 22 2021

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.

PKZ199-230045-
351 AM AKDT Wed Sep 22 2021
.SYNOPSIS FOR SOUTHWEST ALASKA+BRISTOL BAY+THE ALASKA
PENINSULA WATERS AND THE ALEUTIAN ISLANDS...

Semisopochnoi Volcano 140 nm west of Adak is currently active.

A 985 mb low 470 nm southwest of Unalaska on Wed morning weakens 
and elongates as it moves to 340 nm south of Unalaska at 990 mb 
for Wed afternoon. A new 988 mb low develops 220 nm south of
Akhiok Wed night and strengthens as it moves into the Gulf. Its 
front sweeps along the Aleutians and Alaska Peninsula then reaches
the North Gulf Coast by Thu afternoon.

$$

PKZ150-230045-
South of the AK Peninsula Sitkinak to Castle Cape-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TODAY...SE wind 20 kt becoming E 30 kt in the afternoon. Seas 6
ft. Rain.
.TONIGHT...NE wind 30 kt. Seas 11 ft. Rain.
.THU...N wind 30 kt. Seas 13 ft.
.THU NIGHT...NW wind 35 kt. Seas 13 ft.
.FRI...W wind 30 kt. Seas 11 ft.
.SAT...NW wind 20 kt. Seas 6 ft.
.SUN...NW wind 25 kt. Seas 10 ft.

$$

PKZ155-230045-
South of the AK Peninsula Castle Cape to Cape Sarichef-
351 AM AKDT Wed Sep 22 2021

...GALE WARNING TODAY...

.TODAY...NE wind 35 kt. Seas 10 ft. Rain.
.TONIGHT...NE wind 30 kt. Seas 11 ft.
.THU...NW wind 30 kt. Seas 12 ft.
.THU NIGHT...NW wind 30 kt. Seas 11 ft.
.FRI...SW wind 20 kt. Seas 7 ft.
.SAT...N wind 20 kt. Seas 9 ft.
.SUN...NW wind 25 kt. Seas 10 ft.

$$

PKZ160-230045-
Bristol Bay-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THURSDAY...

.TODAY...S wind 10 kt becoming NE in the afternoon. Seas 2 foot.
.TONIGHT...N wind 20 kt. Seas 3 ft.
.THU...NW wind 25 kt. Seas 6 ft.
.THU NIGHT...NW wind 30 kt. Seas 8 ft.
.FRI...NW wind 25 kt. Seas 7 ft.
.SAT...N wind 15 kt. Seas 4 ft.
.SUN...NW wind 20 kt. Seas 7 ft.

$$

PKZ165-230045-
Port Heiden to Cape Sarichef-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TODAY...NE wind 25 kt except NE 20 kt from Port Moller E. Seas
5 ft.
.TONIGHT...N wind 30 kt. Seas 11 ft.
.THU...N wind 30 kt. Seas 11 ft.
.THU NIGHT...NW wind 30 kt. Seas 10 ft.
.FRI THROUGH SAT...N wind 15 kt. Seas 7 ft.
.SUN...NW wind 25 kt. Seas 9 ft.

$$

PKZ170-230045-
Cape Sarichef to Nikolski Bering Side-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TODAY...NE wind 30 kt. Seas 9 ft.
.TONIGHT...N wind 30 kt. Seas 10 ft.
.THU...N wind 25 kt. Seas 10 ft.
.THU NIGHT...SW wind 15 kt. Seas 7 ft.
.FRI...E wind 15 kt. Seas 5 ft.
.SAT...NW wind 25 kt. Seas 7 ft.
.SUN...W wind 25 kt. Seas 9 ft.

$$

PKZ171-230045-
Unalaska Bay-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...NE wind 30 kt. Seas 5 ft building to 8 ft in the
afternoon.
.TONIGHT...N wind 30 kt. Seas 9 ft.
.THU...NW wind 20 kt. Seas 7 ft.
.THU NIGHT...SW wind 15 kt. Seas 2 ft.
.FRI...NE wind 10 kt. Seas 3 ft.
.SAT...NW wind 15 kt. Seas 2 ft.
.SUN...W wind 20 kt. Seas 5 ft.

$$

PKZ172-230045-
Cape Sarichef to Nikolski Pacific Side-
351 AM AKDT Wed Sep 22 2021

...GALE WARNING TODAY...

.TODAY...NE wind 35 kt. Seas 12 ft.
.TONIGHT...N wind 30 kt. Seas 13 ft.
.THU...N wind 30 kt. Seas 11 ft.
.THU NIGHT...W wind 15 kt. Seas 8 ft.
.FRI...W wind 15 kt. Seas 6 ft.
.SAT...NW wind 20 kt. Seas 10 ft.
.SUN...W wind 25 kt. Seas 10 ft.

$$

PKZ173-230045-
Nikolski to Seguam Island Bering Side-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...NE wind 30 kt. Seas 11 ft.
.TONIGHT...N wind 25 kt. Seas 10 ft.
.THU...N wind 15 kt becoming SW in the afternoon. Seas 7 ft.
.THU NIGHT...SW wind 15 kt. Seas 7 ft.
.FRI...W wind 20 kt. Seas 4 ft.
.SAT...NW wind 25 kt. Seas 10 ft.
.SUN...SW wind 20 kt. Seas 10 ft.

$$

PKZ174-230045-
Nikolski to Seguam Island Pacific Side-
351 AM AKDT Wed Sep 22 2021

...GALE WARNING TODAY...

.TODAY...NE wind 40 kt. Seas 16 ft.
.TONIGHT...N wind 30 kt. Seas 15 ft.
.THU...N wind 15 kt in the morning becoming variable 10 kt. Seas
10 ft.
.THU NIGHT...SW wind 15 kt. Seas 7 ft.
.FRI THROUGH SAT...NW wind 25 kt. Seas 8 ft.
.SUN...SW wind 25 kt. Seas 9 ft.

$$

PKZ175-230045-
Seguam Island to Adak Bering Side-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...NE wind 30 kt. Seas 11 ft.
.TONIGHT...NE wind 20 kt. Seas 9 ft.
.THU...SW wind 15 kt. Seas 7 ft.
.THU NIGHT...W wind 15 kt. Seas 6 ft.
.FRI...W wind 20 kt. Seas 5 ft.
.SAT...NW wind 30 kt. Seas 9 ft.
.SUN...S wind 20 kt. Seas 9 ft.

$$

PKZ176-230045-
Seguam Island to Adak Pacific Side-
351 AM AKDT Wed Sep 22 2021

...GALE WARNING TODAY...

.TODAY...NE wind 35 kt. Seas 17 ft.
.TONIGHT...N wind 25 kt diminishing to 15 kt after midnight. Seas
12 ft.
.THU...SW wind 15 kt. Seas 8 ft.
.THU NIGHT...SW wind 15 kt. Seas 7 ft.
.FRI...W wind 20 kt. Seas 7 ft.
.SAT...W wind 25 kt. Seas 9 ft.
.SUN...S wind 25 kt. Seas 12 ft.

$$

PKZ177-230045-
Adak to Kiska-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...NE wind 25 kt. Seas 12 ft.
.TONIGHT...N wind 15 kt in the evening becoming variable 10 kt.
Seas 9 ft.
.THU...SW wind 15 kt. Seas 7 ft.
.THU NIGHT...W wind 15 kt. Seas 5 ft.
.FRI...NW wind 20 kt. Seas 7 ft.
.SAT...NW wind 25 kt. Seas 8 ft.
.SUN...SE wind 25 kt. Seas 10 ft.

$$

PKZ178-230045-
Kiska to Attu-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY TODAY...

.TODAY...E wind 15 kt. Seas 9 ft.
.TONIGHT...S wind 15 kt. Seas 7 ft.
.THU...SW wind 15 kt. Seas 6 ft.
.THU NIGHT...Variable wind 10 kt. Seas 5 ft.
.FRI...NW wind 15 kt. Seas 6 ft.
.SAT...E wind 25 kt. Seas 7 ft.
.SUN...SE wind 30 kt. Seas 10 ft.

$$

PKZ179-230045-
Pribilof Islands Near Shore Waters-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...NE wind 25 kt. Seas 7 ft.
.TONIGHT...N wind 25 kt. Seas 8 ft.
.THU...N wind 15 kt. Seas 7 ft.
.THU NIGHT...Variable wind 10 kt. Seas 5 ft.
.FRI...S wind 15 kt. Seas 4 ft.
.SAT...NW wind 25 kt. Seas 9 ft.
.SUN...W wind 25 kt. Seas 9 ft.

$$

PKZ180-230045-
Kuskokwim Delta and Etolin Strait-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TODAY...N wind 25 kt. Seas 6 ft.
.TONIGHT...N wind 30 kt. Seas 8 ft.
.THU...NW wind 30 kt. Seas 8 ft.
.THU NIGHT...NW wind 25 kt. Seas 7 ft.
.FRI THROUGH SAT...N wind 15 kt. Seas 5 ft.
.SUN...NW wind 20 kt. Seas 7 ft.

$$

PKZ181-230045-
North and West of Nunivak Island-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...N wind 25 kt. Seas 8 ft.
.TONIGHT...N wind 25 kt. Seas 8 ft.
.THU...N wind 20 kt. Seas 6 ft.
.THU NIGHT...NW wind 15 kt. Seas 4 ft.
.FRI...SW wind 15 kt. Seas 4 ft.
.SAT...SW wind 20 kt. Seas 7 ft.
.SUN...W wind 20 kt. Seas 6 ft.

$$

PKZ185-230045-
Saint Matthew Island Waters-
351 AM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY TODAY...

.TODAY...N wind 25 kt E of Saint Matthew Island...NE 20 kt W of
Saint Matthew Island. Seas 7 ft.
.TONIGHT...E of Saint Matthew Island, N wind 20 kt. W of Saint
Matthew Island, N wind 15 kt in the evening becoming variable 10
kt. Seas 6 ft.
.THU...SW wind 20 kt. Seas 4 ft.
.THU NIGHT...SW wind 20 kt. Seas 5 ft.
.FRI THROUGH SAT...NW wind 25 kt. Seas 8 ft.
.SUN...SW wind 20 kt. Seas 6 ft.

$$

787 
FZAK52 PAFC 222349
CWFALU

Coastal Waters Forecast
National Weather Service Anchorage Alaska
349 PM AKDT Wed Sep 22 2021

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.

PKZ199-231245-
349 PM AKDT Wed Sep 22 2021

.SYNOPSIS FOR SOUTHWEST ALASKA+BRISTOL BAY+THE ALASKA
PENINSULA WATERS AND THE ALEUTIAN ISLANDS...

Semisopochnoi Volcano 140 nm west of Adak is currently active.

A 989 mb low 365 nm south of Dutch Harbor merges with a low in the 
Gulf for Thu afternoon. High pressure over the Bering dissipates Fri 
morning. A 1006 mb North Pacific low and its front track south of 
the Aleutians through Fri afternoon. A 1014 mb low moves over Saint 
Matthew Island at 1001 mb by Fri afternoon.

$$

PKZ150-231245-
South of the AK Peninsula Sitkinak to Castle Cape-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY NIGHT...

.TONIGHT...NE wind 15 kt in the evening increasing to 30 kt. 
Seas 11 ft. Rain.
.THU...N wind 30 kt. Seas 13 ft. Rain.
.THU NIGHT...NW wind 30 kt. Seas 13 ft.
.FRI...W wind 30 kt. Seas 11 ft.
.FRI NIGHT...NW wind 15 kt. Seas 6 ft.
.SAT...NW wind 20 kt. Seas 6 ft.
.SUN...NW wind 25 kt. Seas 10 ft.
.MON...W wind 25 kt. Seas 11 ft.

$$

PKZ155-231245-
South of the AK Peninsula Castle Cape to Cape Sarichef-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY NIGHT...

.TONIGHT...NE wind 15 kt in the evening increasing to 30 kt. 
Seas 11 ft.
.THU...NW wind 30 kt. Seas 12 ft.
.THU NIGHT...NW wind 25 kt becoming W 15 kt after midnight. From
the Shumagin Islands E, NW wind 30 kt. Seas 11 ft.
.FRI...W wind 20 kt. Seas 7 ft.
.FRI NIGHT...NE wind 15 kt. Seas 5 ft.
.SAT...NW wind 20 kt. Seas 9 ft.
.SUN...NW wind 25 kt. Seas 10 ft.
.MON...SW wind 20 kt. Seas 10 ft.

$$

PKZ160-231245-
Bristol Bay-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THURSDAY AND THURSDAY NIGHT...

.TONIGHT...N wind 10 kt in the evening increasing to 20 kt.
Seas 3 ft.
.THU...N wind 25 kt. Seas 6 ft.
.THU NIGHT...NW wind 30 kt. Seas 8 ft.
.FRI...NW wind 20 kt. Seas 7 ft.
.FRI NIGHT...N wind 10 kt. Seas 3 ft.
.SAT...N wind 15 kt. Seas 4 ft.
.SUN...NW wind 20 kt. Seas 7 ft.
.MON...NE wind 20 kt. Seas 7 ft.

$$

PKZ165-231245-
Port Heiden to Cape Sarichef-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY NIGHT...

.TONIGHT...N wind 20 kt in the evening increasing to 30 kt. 
Seas 11 ft. 
.THU...N wind 30 kt. Seas 11 ft.
.THU NIGHT...NW wind 20 kt. From Port Moller E, NW wind 30 kt
diminishing to 20 kt after midnight. Seas 10 ft.
.FRI...NW wind 15 kt. Seas 6 ft.
.FRI NIGHT...Variable wind 10 kt. Seas 4 ft.
.SAT...NW wind 15 kt. Seas 7 ft.
.SUN...NW wind 25 kt. Seas 9 ft.
.MON...S wind 15 kt. Seas 9 ft.

$$

PKZ170-231245-
Cape Sarichef to Nikolski Bering Side-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TONIGHT...N wind 30 kt. Seas 10 ft.
.THU...N wind 25 kt. Seas 10 ft.
.THU NIGHT...Variable wind 10 kt. Seas 7 ft.
.FRI...Variable wind 10 kt. Seas 5 ft.
.FRI NIGHT...Variable wind 10 kt. Seas 3 ft.
.SAT THROUGH SUN...W wind 25 kt. Seas 9 ft.
.MON...S wind 25 kt. Seas 7 ft.

$$

PKZ171-231245-
Unalaska Bay-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TONIGHT...N wind 30 kt. Seas 9 ft.
.THU...N wind 25 kt becoming NW 15 kt in the afternoon. Seas 10 ft
subsiding to 5 ft in the afternoon.
.THU NIGHT...NW wind 10 kt in the evening becoming variable less
than 10 kt. Seas 3 ft.
.FRI...Variable wind less than 10 kt. Seas 2 ft.
.FRI NIGHT...NW wind 10 kt. Seas 3 ft.
.SAT...W wind 15 kt. Seas 3 ft.
.SUN...W wind 20 kt. Seas 5 ft.
.MON...S wind 15 kt. Seas 2 ft.

$$

PKZ172-231245-
Cape Sarichef to Nikolski Pacific Side-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY NIGHT...

.TONIGHT...N wind 30 kt. Seas 13 ft.
.THU...N wind 30 kt. Seas 11 ft.
.THU NIGHT...NW wind 15 kt. Seas 8 ft.
.FRI...Variable wind 10 kt. Seas 6 ft.
.FRI NIGHT...N wind 15 kt. Seas 4 ft.
.SAT THROUGH SUN...W wind 25 kt. Seas 10 ft.
.MON...SW wind 30 kt. Seas 8 ft.

$$

PKZ173-231245-
Nikolski to Seguam Island Bering Side-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY TONIGHT...

.TONIGHT...N wind 25 kt. Seas 10 ft.
.THU...N wind 15 kt in the morning becoming variable 10 kt. Seas
7 ft.
.THU NIGHT...S wind 15 kt. Seas 7 ft.
.FRI...W wind 15 kt. Seas 5 ft.
.FRI NIGHT...NW wind 25 kt. Seas 5 ft.
.SAT...NW wind 25 kt. Seas 12 ft.
.SUN...SW wind 20 kt. Seas 10 ft.
.MON...SW wind 25 kt. Seas 8 ft.

$$

PKZ174-231245-
Nikolski to Seguam Island Pacific Side-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TONIGHT...N wind 30 kt. Seas 15 ft.
.THU...N wind 20 kt in the morning becoming variable 10 kt. Seas
10 ft.
.THU NIGHT...SW wind 15 kt. Seas 7 ft. Rain.
.FRI...W wind 15 kt. Seas 5 ft.
.FRI NIGHT...NW wind 20 kt. Seas 6 ft.
.SAT...NW wind 25 kt. Seas 10 ft.
.SUN...SW wind 25 kt. Seas 9 ft.
.MON...SW wind 30 kt. Seas 12 ft.

$$

PKZ175-231245-
Seguam Island to Adak Bering Side-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY TONIGHT...

.TONIGHT...NE wind 20 kt. Seas 9 ft.
.THU...SW wind 15 kt. Seas 7 ft.
.THU NIGHT...SW wind 15 kt. Seas 6 ft.
.FRI...NW wind 15 kt. Seas 5 ft.
.FRI NIGHT...NW wind 25 kt. Seas 6 ft.
.SAT...NW wind 25 kt. Seas 9 ft.
.SUN...S wind 20 kt. Seas 9 ft.
.MON...SW wind 30 kt. Seas 8 ft.

$$

PKZ176-231245-
Seguam Island to Adak Pacific Side-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TONIGHT...N wind 25 kt diminishing to 15 kt after midnight. Seas
12 ft.
.THU...SW wind 15 kt. Seas 8 ft.
.THU NIGHT...SW wind 15 kt. Seas 7 ft. Rain.
.FRI...W wind 15 kt. Seas 5 ft.
.FRI NIGHT...W wind 20 kt. Seas 7 ft.
.SAT...NW wind 20 kt. Seas 8 ft.
.SUN...S wind 25 kt. Seas 12 ft.
.MON...SW wind 30 kt. Seas 12 ft.

$$

PKZ177-231245-
Adak to Kiska-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY TONIGHT...

.TONIGHT...N wind 15 kt in the evening becoming variable 10 kt.
Seas 9 ft.
.THU...SW wind 15 kt. Seas 7 ft.
.THU NIGHT...SW wind 15 kt. Seas 5 ft.
.FRI...NW wind 15 kt. Seas 4 ft.
.FRI NIGHT...NW wind 20 kt. Seas 7 ft.
.SAT...W wind 20 kt. Seas 8 ft.
.SUN...SE wind 25 kt. Seas 10 ft.
.MON...SW wind 30 kt. Seas 10 ft.

$$

PKZ178-231245-
Kiska to Attu-
349 PM AKDT Wed Sep 22 2021

.TONIGHT...S wind 15 kt. Seas 7 ft.
.THU...W wind 15 kt. Seas 6 ft.
.THU NIGHT...Variable wind 10 kt. Seas 5 ft.
.FRI AND FRI NIGHT...NW wind 15 kt. Seas 7 ft.
.SAT...SE wind 25 kt. Seas 6 ft.
.SUN...SE wind 30 kt. Seas 10 ft.
.MON...W wind 25 kt. Seas 9 ft.

$$

PKZ179-231245-
Pribilof Islands Near Shore Waters-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY TONIGHT...

.TONIGHT...N wind 25 kt. Seas 8 ft.
.THU...N wind 20 kt in the morning becoming variable 10 kt. Seas
7 ft.
.THU NIGHT...Variable wind 10 kt. Seas 5 ft.
.FRI...S wind 15 kt. Seas 4 ft.
.FRI NIGHT...SW wind 20 kt. Seas 5 ft.
.SAT THROUGH SUN...W wind 25 kt. Seas 9 ft.
.MON...SE wind 20 kt. Seas 6 ft.

$$

PKZ180-231245-
Kuskokwim Delta and Etolin Strait-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THROUGH THURSDAY NIGHT...

.TONIGHT...N wind 30 kt. Seas 8 ft.
.THU...N wind 30 kt. Seas 8 ft.
.THU NIGHT...NW wind 25 kt. Seas 7 ft.
.FRI...NW wind 15 kt. Seas 4 ft.
.FRI NIGHT...E wind 15 kt. Seas 3 ft.
.SAT...NW wind 15 kt. Seas 6 ft.
.SUN...NW wind 20 kt. Seas 7 ft.
.MON...SE wind 20 kt. Seas 7 ft.

$$

PKZ181-231245-
North and West of Nunivak Island-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY TONIGHT...

.TONIGHT...N wind 25 kt. Seas 8 ft.
.THU...N wind 20 kt. Seas 6 ft.
.THU NIGHT...NW wind 15 kt. Seas 4 ft.
.FRI...SW wind 20 kt. Seas 5 ft.
.FRI NIGHT...SE wind 20 kt. Seas 5 ft.
.SAT...SW wind 20 kt. Seas 7 ft.
.SUN...W wind 20 kt. Seas 6 ft.
.MON...SE wind 20 kt. Seas 6 ft.

$$

PKZ185-231245-
Saint Matthew Island Waters-
349 PM AKDT Wed Sep 22 2021

...SMALL CRAFT ADVISORY THURSDAY AND THURSDAY NIGHT...

.TONIGHT...N wind 20 kt. Seas 6 ft.
.THU...NW wind 15 kt E of Saint Matthew Island...SW 25 kt W of Saint
Matthew Island. Seas 4 ft.
.THU NIGHT...SW wind 25 kt. Seas 5 ft.
.FRI...W wind 25 kt. Seas 7 ft.
.FRI NIGHT...NW wind 30 kt. Seas 10 ft.
.SAT...NW wind 30 kt. Seas 9 ft.
.SUN...SW wind 20 kt. Seas 6 ft.
.MON...E wind 20 kt. Seas 7 ft.

$$

310 
FZAK52 PAFC 231139
CWFALU

Coastal Waters Forecast
National Weather Service Anchorage Alaska
339 AM AKDT Thu Sep 23 2021

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.

PKZ199-240100-
339 AM AKDT Thu Sep 23 2021
.SYNOPSIS FOR SOUTHWEST ALASKA+BRISTOL BAY+THE ALASKA
PENINSULA WATERS AND THE ALEUTIAN ISLANDS...

Semisopochnoi Volcano 140 nm west of Adak is currently active.

High pressure over the Bering dissipates Fri morning. A 1002 mb 
North Pacific low and its front tracks south of the Aleutians 
through Fri afternoon. 

$$

PKZ150-240100-
South of the AK Peninsula Sitkinak to Castle Cape-
339 AM AKDT Thu Sep 23 2021

...GALE WARNING TONIGHT...

.TODAY...N wind 30 kt. Seas 12 ft. Rain.
.TONIGHT...NW wind 35 kt. Seas 12 ft.
.FRI...NW wind 30 kt becoming W 20 kt in the afternoon. Seas 11
ft.
.FRI NIGHT...W wind 15 kt. Seas 6 ft.
.SAT...NW wind 20 kt. Seas 4 ft.
.SUN...NW wind 25 kt. Seas 8 ft.
.MON...S wind 25 kt. Seas 9 ft.

$$

PKZ155-240100-
South of the AK Peninsula Castle Cape to Cape Sarichef-
339 AM AKDT Thu Sep 23 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...NW wind 30 kt. Seas 11 ft.
.TONIGHT...NW wind 25 kt becoming W 15 kt after midnight. From the
Shumagin Islands E, NW wind 30 kt. Seas 11 ft.
.FRI...Variable wind 10 kt except W 20 kt from the Shumagin
Islands E. Seas 7 ft.
.FRI NIGHT...Variable wind 10 kt. Seas 4 ft.
.SAT...NW wind 20 kt. Seas 7 ft.
.SUN...W wind 25 kt. Seas 8 ft.
.MON...SW wind 30 kt. Seas 10 ft.

$$

PKZ160-240100-
Bristol Bay-
339 AM AKDT Thu Sep 23 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...NW wind 30 kt. Seas 6 ft.
.TONIGHT...NW wind 30 kt. Seas 8 ft.
.FRI...NW wind 20 kt. Seas 7 ft.
.FRI NIGHT...N wind 10 kt. Seas 3 ft.
.SAT...N wind 15 kt. Seas 2 ft.
.SUN...NW wind 20 kt. Seas 6 ft.
.MON...E wind 20 kt. Seas 4 ft.

$$

PKZ165-240100-
Port Heiden to Cape Sarichef-
339 AM AKDT Thu Sep 23 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...N wind 30 kt. Seas 10 ft.
.TONIGHT...NW wind 20 kt. From Port Moller E, NW wind 30 kt
diminishing to 20 kt after midnight. Seas 9 ft.
.FRI...W wind 15 kt. Seas 5 ft.
.FRI NIGHT...Variable wind 10 kt. Seas 3 ft.
.SAT...NW wind 20 kt. Seas 10 ft.
.SUN...W wind 25 kt. Seas 10 ft.
.MON...S wind 25 kt. Seas 7 ft.

$$

PKZ170-240100-
Cape Sarichef to Nikolski Bering Side-
339 AM AKDT Thu Sep 23 2021

...SMALL CRAFT ADVISORY TODAY...

.TODAY...N wind 25 kt. Seas 9 ft.
.TONIGHT...Variable wind 10 kt. Seas 6 ft.
.FRI...Variable wind 10 kt. Seas 4 ft.
.FRI NIGHT...W wind 15 kt. Seas 3 ft.
.SAT...NW wind 25 kt. Seas 14 ft.
.SUN THROUGH MON...SW wind 30 kt. Seas 11 ft.

$$

PKZ171-240100-
Unalaska Bay-
339 AM AKDT Thu Sep 23 2021

...SMALL CRAFT ADVISORY TODAY...

.TODAY...N wind 25 kt becoming NW 15 kt in the afternoon. Seas 7
ft.
.TONIGHT...W wind 10 kt in the evening becoming variable less than
10 kt. Seas 3 ft.
.FRI...Variable wind less than 10 kt. Seas 3 ft.
.FRI NIGHT...NW wind 10 kt. Seas 3 ft.
.SAT...NW wind 25 kt. Seas 10 ft.
.SUN THROUGH MON...SW wind 25 kt. Seas 5 ft.

$$

PKZ172-240100-
Cape Sarichef to Nikolski Pacific Side-
339 AM AKDT Thu Sep 23 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...N wind 30 kt becoming NW 20 kt in the afternoon. Seas
11 ft.
.TONIGHT...W wind 15 kt. Seas 8 ft.
.FRI...Variable wind 10 kt. Seas 5 ft.
.FRI NIGHT...NW wind 15 kt. Seas 4 ft.
.SAT...NW wind 30 kt. Seas 9 ft.
.SUN...SW wind 30 kt. Seas 9 ft.
.MON...SW wind 30 kt. Seas 13 ft.

$$

PKZ173-240100-
Nikolski to Seguam Island Bering Side-
339 AM AKDT Thu Sep 23 2021

.TODAY...N wind 15 kt in the morning becoming variable 10 kt. Seas
7 ft.
.TONIGHT...S wind 15 kt. Seas 6 ft.
.FRI...W wind 15 kt. Seas 4 ft.
.FRI NIGHT...NW wind 25 kt. Seas 6 ft.
.SAT...NW wind 25 kt. Seas 12 ft.
.SUN...S wind 35 kt. Seas 10 ft.
.MON...SW wind 30 kt. Seas 12 ft.

$$

PKZ174-240100-
Nikolski to Seguam Island Pacific Side-
339 AM AKDT Thu Sep 23 2021

...SMALL CRAFT ADVISORY TODAY...

.TODAY...N wind 15 kt. Seas 10 ft.
.TONIGHT...SW wind 15 kt. Seas 7 ft. Rain.
.FRI...W wind 15 kt. Seas 6 ft.
.FRI NIGHT...W wind 20 kt. Seas 5 ft.
.SAT...NW wind 30 kt. Seas 10 ft.
.SUN...S wind 35 kt. Seas 11 ft.
.MON...SW wind 35 kt. Seas 14 ft.

$$

PKZ175-240100-
Seguam Island to Adak Bering Side-
339 AM AKDT Thu Sep 23 2021

.TODAY...Variable wind 10 kt. Seas 6 ft.
.TONIGHT...SW wind 15 kt. Seas 6 ft.
.FRI...NW wind 15 kt. Seas 4 ft.
.FRI NIGHT...NW wind 25 kt. Seas 6 ft.
.SAT...NW wind 25 kt. Seas 10 ft.
.SUN...S wind 30 kt. Seas 8 ft.
.MON...W wind 30 kt. Seas 11 ft.

$$

PKZ176-240100-
Seguam Island to Adak Pacific Side-
339 AM AKDT Thu Sep 23 2021

...SMALL CRAFT ADVISORY TODAY...

.TODAY...SW wind 15 kt. Seas 8 ft.
.TONIGHT...SW wind 15 kt. Seas 7 ft. Rain.
.FRI...W wind 15 kt. Seas 5 ft.
.FRI NIGHT...NW wind 20 kt. Seas 7 ft.
.SAT...NW wind 25 kt. Seas 8 ft.
.SUN...S wind 30 kt. Seas 10 ft.
.MON...W wind 35 kt. Seas 13 ft.

$$

PKZ177-240100-
Adak to Kiska-
339 AM AKDT Thu Sep 23 2021

.TODAY...SW wind 15 kt. Seas 7 ft.
.TONIGHT...SW wind 15 kt. Seas 6 ft.
.FRI...NW wind 15 kt. Seas 5 ft.
.FRI NIGHT...NW wind 20 kt. Seas 7 ft.
.SAT...W wind 25 kt. Seas 7 ft.
.SUN...S wind 30 kt. Seas 10 ft.
.MON...W wind 30 kt. Seas 11 ft.

$$

PKZ178-240100-
Kiska to Attu-
339 AM AKDT Thu Sep 23 2021

.TODAY...Variable wind 10 kt. Seas 6 ft.
.TONIGHT...Variable wind 10 kt. Seas 5 ft.
.FRI...NW wind 15 kt. Seas 6 ft.
.FRI NIGHT...NW wind 15 kt. Seas 7 ft.
.SAT...SE wind 25 kt. Seas 7 ft.
.SUN...SW wind 30 kt. Seas 9 ft.
.MON...W wind 30 kt. Seas 9 ft.

$$

PKZ179-240100-
Pribilof Islands Near Shore Waters-
339 AM AKDT Thu Sep 23 2021

.TODAY...N wind 20 kt in the morning becoming variable 10 kt. Seas
7 ft.
.TONIGHT...Variable wind 10 kt. Seas 4 ft.
.FRI...S wind 15 kt. Seas 3 ft. Rain showers.
.FRI NIGHT...SW wind 15 kt. Seas 4 ft.
.SAT...NW wind 25 kt. Seas 12 ft.
.SUN...S wind 30 kt. Seas 7 ft.
.MON...E wind 30 kt. Seas 7 ft.

$$

PKZ180-240100-
Kuskokwim Delta and Etolin Strait-
339 AM AKDT Thu Sep 23 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...N wind 30 kt. Seas 7 ft.
.TONIGHT...NW wind 25 kt. Seas 7 ft.
.FRI...NW wind 15 kt diminishing to 10 kt in the afternoon. Seas
4 ft.
.FRI NIGHT...E wind 15 kt. Seas 2 ft.
.SAT...W wind 15 kt. Seas 6 ft.
.SUN...W wind 20 kt. Seas 7 ft.
.MON...E wind 25 kt. Seas 5 ft.

$$

PKZ181-240100-
North and West of Nunivak Island-
339 AM AKDT Thu Sep 23 2021

.TODAY...N wind 20 kt. Seas 5 ft.
.TONIGHT...NW wind 15 kt. Seas 3 ft.
.FRI...S wind 20 kt. Seas 5 ft.
.FRI NIGHT...S wind 20 kt. Seas 5 ft.
.SAT THROUGH SUN...SW wind 20 kt. Seas 6 ft.
.MON...E wind 20 kt. Seas 5 ft.

$$

PKZ185-240100-
Saint Matthew Island Waters-
339 AM AKDT Thu Sep 23 2021

...SMALL CRAFT ADVISORY THROUGH FRIDAY...

.TODAY...NW wind 15 kt E of Saint Matthew Island... SW 25 kt W of
Saint Matthew Island. Seas 5 ft.
.TONIGHT...SW wind 25 kt. Seas 6 ft.
.FRI...E of Saint Matthew Island, S wind 20 kt. W of Saint Matthew
Island, NW wind 20 kt increasing to 30 kt in the afternoon. Seas
9 ft.
.FRI NIGHT...NW wind 25 kt. Seas 10 ft.
.SAT...NW wind 25 kt. Seas 9 ft.
.SUN...SW wind 20 kt. Seas 5 ft.
.MON...NE wind 20 kt. Seas 7 ft.

$$

Southcentral and Southwest Alaska Forecast Discussion
National Weather Service Anchorage AK
454 PM AKDT Mon Sep 20 2021

.ANALYSIS AND UPPER LEVELS...

The weather pattern is dominated by an upper-level trough digging
south across the state to the Gulf and a ridge building upstream
over the Bering. Within the trough are two distinct surface lows.
One is located in the Gulf just east of Kodiak Island, with its
associated front extending along the Southeast coastline and the
other is in northern Alaska by the Brooks Range with its
associated front extending down through the interior to Kodiak.
The low in northern Alaska has upper air support from a jet streak
measuring 90 kts and is driving cold arctic air down into the
interior up against the Alaska Range this afternoon. With the
combination of cold air advection and frontal passage, winds are
beginning to pick up across Southcentral. Radar is showing returns
by Prince William Sound enhanced by shortwaves spinning off the
main low in the Gulf and a deformation band over the Susitna
Valley as the flow aloft diverges between the two.

A ridge of high pressure is extending from the Aleutians to the
Alaska Peninsula. Satellite shows a blanket of low stratus over
much of the Bering and Aleutians as the ridge progresses east.
Winds over the Aleutians/Bering are slowly beginning to die down
as the ridge builds over the area and the trough pushes into the
Gulf.

&&

.MODEL DISCUSSION...

Models are in good synoptic agreement through the short-term. As
the low in the Gulf moves east, the GFS has the upper-level ridge
over the Alaska/Yukon border nose into interior Alaska more than
the other solutions until it finally aligns with the others around
12z Thursday. Models are also having trouble keying in on the
location of a surface low south/southwest of Kodiak Island as it
moves from the Gulf towards Prince William Sound by Wednesday 12z.
The GFS is showing a slower solution and is holding the low
slightly west compared to the solutions (NAM/GEM/EC). The models
are also struggling with the location of an upper-level low that
drops south from the Chukchi Sea towards Western Alaska by
Wednesday. The GFS/EC solutions is showing the center location
over the Kuskokwim Delta while the NAM/Canadian have it positioned
further northeast by Norton Sound. Overall, forecast confidence
is good for the short-term and increasing for the long-term.

&&

.AVIATION...

PANC...VFR conditions will persist with a slight chance of a
shower passing over the terminal through late evening. North
winds will increase by late afternoon with gusts increasing by
evening. Winds and gusts may diminish in intensity briefly during
the early morning hours of Tuesday before increasing again by
late Tuesday morning. Northerly wind gusts on Tuesday could reach
35 kt at times.

&&

.SHORT TERM FORECAST SOUTHCENTRAL ALASKA (Days 1 through 3:
This afternoon through Thursday)...

A cold front moving into the area from the west will interact
with a moisture laden low over the northern Gulf to produce the
first snow of the season for the Copper River Basin and gusty
northerly winds across the region as well as the coldest air of
the season to the area.

A cold front currently over the northern Susitna valley is being
pushed into the area by an upper level shortwave while low
pressure moving into the northern Gulf is producing rain across
the northern Gulf coast as well as the western Susitna valley. The
cold air will move across the area tonight dropping snow levels
to the surface across much of the area. This cold air will
interact with the moisture to produce snow. Snow will initially
develop over the northern Susitna Valley and along the Glenn
Highway east of Palmer in the higher elevations like Eureka.
Expect 7-9 inches of snow from roughly Eureka to Tolsona along
the Glenn Highway. While the lower elevations like Gulkana and
Chitina will see lower snow accumulations generally 2 to 4 inches.
Additionally, along the Edgerton Highway between Valdez and
Tonsina in higher elevations expect 4 to 6 inches of snow. See the
Winter Weather Advisory issued for the Copper Basin for more
information.

Rain will also change over to snow on the Anchorage Hillside
tonight with a half inch or less possible before ending early
Wednesday morning. Additionally, higher elevations in Eagle River
especially along Hiland Road will see up to an inch of snow
tonight through early Wednesday morning. Otherwise populated areas
like Anchorage and the MAT Valley as well as Kenai, Soldotna and
Homer will only see rain ending tonight with no snow expected.
Clouds will hang tough on Tuesday across Anchorage and the MAT
Valley keeping it cool throughout the day with highs in the 40s.

Strong gap winds aided by cold air advection will be the other
main impact from these two systems. Strong gusty winds can be
expected through the typical places, including the Barren Islands,
Seward, and Whittier. Gusts may reach as high as 50 mph for
Whittier and Seward on Tuesday. The Anchorage Bowl itself will
also be gusty with northwesterly winds gusting up to 35 mph,
especially on the west side of town. Elevated mountain passes,
particularly Thompson Pass, are also expected to experience some
blowing snow with gusty winds accompanying higher snowfall rates.

The weather will calm down on Wednesday as a weak shortwave ridge
moves in from the west. Clearing skies overnight will likely make
Wednesday morning the coldest of the week with lows dropping below
freezing at sea level for the mainland. High clouds will begin to
stream in from the southwest as the next large low moves in from
the north Pacific. Some uncertainty remains as to weather the low
will remain closed, or become complex with a second low center
developing along the front as it moves into the southern Gulf
Wednesday evening. Even so, fairly widespread Gales are expected
over the marine areas with the minimum low pressure bottoming out
somewhere in the 975-980 mb range. A storm force barrier jet is
possible along the Gulf Coast Thursday but remains uncertain at
this time. For precipitation, the Gulf Coast and Kodiak can expect
moderate to heavy rain as the front moves through the area. The
low center is expected to remain well into the Gulf, so northerly
outflow winds are likely through the typical spots.

&&

.SHORT TERM FORECAST SOUTHWEST ALASKA (Days 1 through 3: Tonight
through Thursday)...

Much cooler temperatures and mixed rain/snow (especially along the
higher elevations) will fill Southwest AK in the next few days. Cold
air advection (-7 to -10C at 850 mb) will linger over the region,
followed by another sequence of much colder air from upstream
accompanying an Arctic trough that could arrive near the Yukon
Delta and Southwest Coast between Tuesday night and Wednesday
morning. This trough is expected to focus heavily over Southwest
Coast on Wednesday and Wednesday night, leading to a prolong
mixed rain/snow event and more further inland near the Kuskokwim
Delta. A cold front exiting Bristol Bay this afternoon will
provide gusty northwest winds up to 45 mph tonight, then tapering
off Tuesday morning. All in all, overnight temperatures will fall
in the lower 20s to lower 30s, with day time highs ranging in the
30s to mid 40s across Southwest.

&&

.SHORT TERM FORECAST BERING SEA/ALEUTIANS (Days 1 through 3:
Tonight through Thursday)...

The Semisopochnoi volcano west of Adak is still currently active.

Two separate upper level ridges, one over the central Aleutians
and the next emerging ridge over the western Bering, will block an
upper trough from the North Pacific to remain over the southern
Bering and across the Aleutian Chain through Wednesday. The
Arctic trough over the Southwest Coast on Wednesday morning will
continue racing southward through the eastern Aleutians and the
Alaska Peninsula between Wednesday night and Thursday afternoon.
This expected system could bring mixed rain/snow through the
eastern Bering especially near higher elevations over the eastern
Aleutians. As a result, anticipate a relatively quiet forecast
except for gales in several marine areas over the Aleutian Chain
between tonight and Tuesday night. Much stronger gusts will
continue along the gaps and passes especially along the Aleutians
through the next few days.

&&

.MARINE (Days 3 through 5/ Thursday through Saturday)...

Gulf of Alaska....A well-developed low south of Kodiak Island
moves to the North Gulf Coast by Friday. This low spreads
predominantly easterly high end gales, with several areas of storm
force winds, along the North Gulf Coast and northeasterly winds
through Cook Inlet and Shelikof Strait, slowly diminishing Friday
night. Northwesterly high end gale force gap winds through the
Barren Islands and Sitkinak areas, Friday diminishing Saturday.
Seas to 19 ft spread across the Gulf, subsiding Saturday.

Bering Sea....A North Pacific low intensifies as it tracks along
the Aleutian Islands through Saturday. Predominantly high end
gales with the low and areas of storm force winds on the Pacific
side of the Aleutians and southern Bering Sea for Friday morning
through Saturday. Seas to 19 ft south of the Aleutians through
Saturday.

&&

.LONG TERM FORECAST (Days 4 through 7: Friday through Monday)...

Long-range guidance is in very good agreement, showing a
continuation of an amplified pattern with well-defined and strong
upper-level features. A 140 kt subtropical jet outlines an upper-
level trough from east of Kamchatka to the Gulf of Alaska,
bookended by two distinct upper-level lows. The polar jet is
digging south from eastern Russia, and is acting to further
amplify the pattern downstream. The first upper-level low over the
western Gulf will move to the northern Gulf Friday before
weakening and moving inland. The polar jet will send a shortwave
south across the Bering while a second wave moves east with
support of the subtropical jet. Both systems will attempt to phase
and dig southward, amplifying a ridge out ahead of it across the
Gulf and over Southcentral. The upper-level trough then quickly
deepens and becomes a closed low south of the AKPen by Sunday
morning. This feature then moves to the northern Gulf by Monday
morning as an upper-level ridge builds in its wake.

The result of this pattern will be the erosion of the colder air
across the Southern Mainland as a southerly flow aloft develops
ahead of the trough in the western Gulf. Rain will continue across
coastal Southcentral through Saturday, with southeasterly gap
winds ahead of this system diminishing as the low moves toward
Prince William Sound. There will be some colder air wrapping
around the back side of the low, which will allow for rain to
transition to snow in the higher elevations.

As this system weakens, the next low moves into the western Gulf
for Sunday morning as its front lifts to the northern Gulf.
Another round of strong gap winds and rain are expected across
coastal locations with gale to storm-force easterly winds
expected ahead of the aforementioned front. Unsettled weather will
persist into early next week as the low continues to track toward
Prince William Sound.

Out west, the ridge will keep conditions rather quiet across the
eastern half of the Bering and Aleutians through early Saturday
before a storm-force low south of Attu begins to track east along
the Chain. This system will advect colder air behind it, with
northerly gales and storm-force gusts likely across the Bering and
central Bering Saturday and across the eastern Bering and
Aleutians and AKPen by Sunday. A second storm-force low then looks
to develop near Attu by late Sunday or early Monday.

&&

.AFC WATCHES/WARNINGS/ADVISORIES...
PUBLIC...Winter Weather Advisory 141.
MARINE...Gale 119 120 130-132 138 150 174-177.
FIRE WEATHER...NONE.

&&

SYNOPSIS AND MODEL DISCUSSION...TM
SOUTHCENTRAL ALASKA...RC
SOUTHWEST ALASKA/BERING SEA/ALEUTIANS...CB
MARINE/LONG TERM...CJ

SPECIAL WEATHER STATEMENT
National Weather Service ANCHORAGE AK
1129 PM AKDT Mon Sep 20 2021

AKZ131-211930-
Northeast Prince William Sound-
Including the cities of Valdez and Thompson Pass
1129 PM AKDT Mon Sep 20 2021

...AN EARLY SEASON STORM TO BRING POSSIBLE SNOW AND BLOWING SNOW
TO THOMPSON PASS...

Cold air will filter southward early Tuesday morning, allowing rain
to turn to snow and begin to accumulate. At the same time,
increasing winds on Tuesday may begin to cause visibility issues.
Blowing snow should be mitigated by warm road and surface
temperatures, but the combination of falling snow and wind are
expected to be impactful.

Stay tuned to the most current information at:
www.weather.gov/anchorage

AKZ125-211930-
Western Prince William Sound-
Including the cities of Whittier, Seward, Girdwood,
and Moose Pass
1129 PM AKDT Mon Sep 20 2021

...STRONG OUTFLOW WINDS EXPECTED OVER WHITTIER AND SEWARD
THROUGH WEDNESDAY...

A low moving into the Gulf will combine with incoming cold air
from the north to produce strong outflow winds through Seward and
Whittier through Wednesday. Sustained winds between 30 and 45 mph
are expected for both areas with gusts between 45 and 55 mph.
Winds will peak Tuesday morning and diminish slowly through
Wednesday. Time should be taken prior to the arrival of the winds
to secure loose items outdoors. With foliage still on the trees
there is a higher likelihood of damage to trees and falling tree
branches.

Stay tuned to the most current information at:
www.weather.gov/anchorage

AKZ171-211930-
Kodiak Island-
Including the city of Kodiak City
1129 PM AKDT Mon Sep 20 2021

...RESUSPENDED ASH FROM NOVARUPTA OVER KODIAK ISLAND THROUGH
TUESDAY...

Strong northwesterly winds to 45 mph have developed across
Shelikof Strait and the waters around southern Kodiak Island, and will
persist through Tuesday. These winds have resuspended ash from
the 1912 Novarupta eruption, causing haze and reductions in air
quality. Villages such as Karluk and Akhiok are most likely to be
impacted.

Those with respiratory ailments in these areas are encouraged to
avoid or reduce outdoor activity to avoid inhaling the ash.

The winds will subside by Tuesday night, which will cause the air
quality to improve.