Gale Warning 383, NWS Anchorage, AK

803 
FZAK52 PAFC 161142
CWFALU

Coastal Waters Forecast
National Weather Service Anchorage Alaska
342 AM AKDT Wed Aug 16 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.

PKZ199-170030-
342 AM AKDT Wed Aug 16 2017
.SYNOPSIS FOR SOUTHWEST ALASKA+BRISTOL BAY+THE ALASKA
PENINSULA WATERS AND THE ALEUTIAN ISLANDS...

Bogoslof volcano, 53 nm northwest of Dutch Harbor, is currently 
active. 

High pressure over the western Aleutians will slowly shift south
into the North Pacific through Fri morning. A 994 mb low will
move to 90 NM south of Gambell Wed evening and weaken to 998 mb 
as it moves over Bristol Bay Thu morning before dissipating. A 999
mb low will move to 260 NM west of Saint Matthew Island Thu 
morning and dissipate near St Paul Island Fri morning.

$$

PKZ150-170030-
South of the AK Peninsula Sitkinak to Castle Cape-
342 AM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TODAY...SW wind 25 kt. Seas 9 ft. Rain.
.TONIGHT...W wind 25 kt. Seas 9 ft. Rain.
.THU...W wind 25 kt. Seas 10 ft.
.THU NIGHT...W wind 25 kt. Seas 10 ft.
.FRI...W wind 25 kt. Seas 8 ft.
.SAT...S wind 20 kt. Seas 8 ft.
.SUN...NW wind 25 kt. Seas 9 ft.

$$

PKZ155-170030-
South of the AK Peninsula Castle Cape to Cape Sarichef-
342 AM AKDT Wed Aug 16 2017

...GALE WARNING TONIGHT AND THURSDAY...

.TODAY...W wind 25 kt. Seas 8 ft.
.TONIGHT...W wind 35 kt except W 25 kt from the Shumagin Islands E. 
Seas 11 ft. Rain.
.THU...W wind 35 kt. Seas 11 ft.
.THU NIGHT...W wind 25 kt. Seas 10 ft.
.FRI...SW wind 25 kt. Seas 8 ft.
.SAT...E wind 20 kt. Seas 9 ft.
.SUN...NW wind 20 kt. Seas 9 ft.

$$

PKZ160-170030-
Bristol Bay-
342 AM AKDT Wed Aug 16 2017

.TODAY...W wind 20 kt. Seas 5 ft. Widespread rain showers.
.TONIGHT...W wind 20 kt. Seas 5 ft. Patchy fog.
.THU...SW wind 10 kt increasing to 15 kt in the afternoon. Seas 3
ft building to 6 ft in the afternoon. Patchy fog.
.THU NIGHT...W wind 20 kt. Seas 7 ft.
.FRI...W wind 15 kt. Seas 6 ft.
.SAT THROUGH SUN...NW wind 20 kt. Seas 4 ft.

$$

PKZ165-170030-
Port Heiden to Cape Sarichef-
342 AM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TODAY...W wind 25 kt. Seas 7 ft. Rain.
.TONIGHT...W wind 30 kt except W 25 kt from Port Moller E. Seas
11 ft. Rain.
.THU...W wind 30 kt. Seas 13 ft. Rain.
.THU NIGHT...W wind 25 kt. Seas 11 ft.
.FRI...SW wind 25 kt. Seas 9 ft.
.SAT...NE wind 20 kt. Seas 5 ft.
.SUN...N wind 20 kt. Seas 5 ft.

$$

PKZ170-170030-
Cape Sarichef to Nikolski Bering Side-
342 AM AKDT Wed Aug 16 2017

...GALE WARNING TONIGHT...

.TODAY...W wind 30 kt. Seas 9 ft.
.TONIGHT...W wind 35 kt. Seas 14 ft.
.THU...W wind 30 kt. Seas 14 ft.
.THU NIGHT...W wind 25 kt. Seas 11 ft.
.FRI...S wind 20 kt. Seas 8 ft.
.SAT...NE wind 20 kt. Seas 7 ft.
.SUN...N wind 20 kt. Seas 7 ft.

$$

PKZ171-170030-
Unalaska Bay-
342 AM AKDT Wed Aug 16 2017

...GALE WARNING TONIGHT AND THURSDAY...

.TODAY...W wind 25 kt. Seas 4 ft.
.TONIGHT...W wind 35 kt. Seas 5 ft.
.THU...W wind 35 kt. Seas 5 ft.
.THU NIGHT...W wind 25 kt. Seas 4 ft.
.FRI...S wind 15 kt. Seas 2 ft.
.SAT...NE wind 15 kt. Seas 3 ft.
.SUN...N wind 10 kt. Seas 3 ft.

$$

PKZ172-170030-
Cape Sarichef to Nikolski Pacific Side-
342 AM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TODAY...W wind 25 kt. Seas 8 ft.
.TONIGHT...W wind 30 kt. Seas 10 ft.
.THU...W wind 30 kt. Seas 10 ft.
.THU NIGHT...W wind 25 kt. Seas 8 ft.
.FRI...S wind 20 kt. Seas 8 ft.
.SAT...E wind 20 kt. Seas 8 ft.
.SUN...N wind 20 kt. Seas 8 ft.

$$

PKZ173-170030-
Nikloski to Seguam Island Bering Side-
342 AM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TODAY...W wind 30 kt. Seas 10 ft. Patchy fog.
.TONIGHT...W wind 30 kt. Seas 12 ft.
.THU...W wind 30 kt. Seas 12 ft.
.THU NIGHT...SW wind 20 kt. Seas 10 ft.
.FRI...E wind 20 kt. Seas 8 ft.
.SAT THROUGH SUN...NE wind 15 kt. Seas 7 ft.

$$

PKZ174-170030-
Nikolski to Seguam Island Pacific Side-
342 AM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TODAY...W wind 25 kt. Seas 8 ft. Patchy fog.
.TONIGHT...W wind 30 kt. Seas 9 ft.
.THU...W wind 25 kt. Seas 8 ft. Patchy fog.
.THU NIGHT...SW wind 20 kt. Seas 7 ft.
.FRI...SE wind 25 kt. Seas 9 ft.
.SAT THROUGH SUN...N wind 15 kt. Seas 7 ft.

$$

PKZ175-170030-
Seguam Island to Adak Bering Side-
342 AM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TODAY...W wind 25 kt. Seas 8 ft. Patchy fog.
.TONIGHT...W wind 25 kt. Seas 9 ft. Patchy fog.
.THU...W wind 25 kt. Seas 10 ft. Patchy fog.
.THU NIGHT...SW wind 15 kt. Seas 8 ft.
.FRI THROUGH SAT...N wind 20 kt. Seas 7 ft.
.SUN...E wind 15 kt. Seas 7 ft.

$$

PKZ176-170030-
Seguam Island to Adak Pacific Side-
342 AM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY TODAY...

.TODAY...W wind 25 kt. Seas 6 ft. Patchy fog.
.TONIGHT...W wind 20 kt. Seas 5 ft. Patchy fog.
.THU...W wind 20 kt. Seas 5 ft. Patchy fog.
.THU NIGHT...SE wind 25 kt. Seas 8 ft.
.FRI...NE wind 25 kt. Seas 10 ft.
.SAT...NW wind 20 kt. Seas 8 ft.
.SUN...Variable wind 10 kt. Seas 5 ft.

$$

PKZ177-170030-
Adak to Kiska-
342 AM AKDT Wed Aug 16 2017

.TODAY...NW wind 20 kt. Seas 6 ft. Patchy fog.
.TONIGHT...W wind 20 kt. Seas 6 ft. Patchy fog.
.THU...SW wind 15 kt. Seas 6 ft. Patchy fog.
.THU NIGHT...NE wind 20 kt. Seas 10 ft.
.FRI...N wind 20 kt. Seas 10 ft.
.SAT...N wind 15 kt. Seas 6 ft.
.SUN...SE wind 15 kt. Seas 7 ft.

$$

PKZ178-170030-
Kiska to Attu-
342 AM AKDT Wed Aug 16 2017

.TODAY...W wind 15 kt. Seas 5 ft. Areas of fog.
.TONIGHT...SW wind 15 kt. Seas 5 ft. Patchy fog.
.THU...SW wind 15 kt. Seas 5 ft. Patchy fog.
.THU NIGHT...NW wind 15 kt. Seas 8 ft.
.FRI...NW wind 15 kt. Seas 9 ft.
.SAT...N wind 15 kt. Seas 6 ft.
.SUN...SE wind 15 kt. Seas 6 ft.

$$

PKZ179-170030-
Pribilof Islands Near Shore Waters-
342 AM AKDT Wed Aug 16 2017

...GALE WARNING TONIGHT...

.TODAY...W wind 30 kt. Seas 9 ft. Rain.
.TONIGHT...W wind 35 kt. Seas 14 ft.
.THU...W wind 30 kt. Seas 14 ft.
.THU NIGHT...W wind 25 kt. Seas 10 ft.
.FRI...S wind 15 kt. Seas 7 ft.
.SAT...NE wind 15 kt. Seas 5 ft.
.SUN...NW wind 15 kt. Seas 4 ft.

$$

PKZ180-170030-
Kuskokwim Delta and Etolin Strait-
342 AM AKDT Wed Aug 16 2017

.TODAY...W wind 20 kt. Seas 4 ft.
.TONIGHT...SW wind 20 kt. Seas 5 ft. Patchy fog.
.THU...W wind 20 kt. Seas 7 ft.
.THU NIGHT...NW wind 20 kt. Seas 7 ft.
.FRI...N wind 15 kt. Seas 6 ft.
.SAT THROUGH SUN...NW wind 20 kt. Seas 5 ft.

$$

PKZ181-170030-
North and West of Nunivak Island-
342 AM AKDT Wed Aug 16 2017

.TODAY...NW wind 15 kt. Seas 3 ft.
.TONIGHT...SW wind 20 kt. Seas 6 ft. Patchy fog.
.THU...NW wind 15 kt. Seas 6 ft.
.THU NIGHT...N wind 15 kt. Seas 5 ft.
.FRI THROUGH SAT...N wind 15 kt. Seas 5 ft.
.SUN...NW wind 15 kt. Seas 5 ft.

$$

PKZ185-170030-
Saint Matthew Island Waters-
342 AM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TODAY...W wind 20 kt E of Saint Matthew Island...W 30 kt W of
Saint Matthew Island. Seas 11 ft.
.TONIGHT...W wind 30 kt. Seas 12 ft.
.THU...E of Saint Matthew Island, N wind 15 kt. W of Saint Matthew
Island, NW wind 25 kt becoming NE in the afternoon. Seas 9 ft.
.THU NIGHT...NE wind 15 kt. Seas 7 ft.
.FRI...NE wind 15 kt. Seas 5 ft.
.SAT...W wind 15 kt. Seas 5 ft.
.SUN...W wind 20 kt. Seas 6 ft.

$$

251 
FZAK52 PAFC 162332
CWFALU

Coastal Waters Forecast
National Weather Service Anchorage Alaska
332 PM AKDT Wed Aug 16 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.

PKZ199-171230-
332 PM AKDT Wed Aug 16 2017
.SYNOPSIS FOR SOUTHWEST ALASKA+BRISTOL BAY+THE ALASKA
PENINSULA WATERS AND THE ALEUTIAN ISLANDS...

High pressure over the western Aleutians will slowly shift south
into the North Pacific through Fri morning. A 994 mb low 120 NM
west of Gambell will move to 90 NM west of Cape Newenham and 
weaken to 996 mb Thu morning, then move inland and dissipate Thu 
afternoon. A broad trough of low pressure will remain across the 
northern and eastern Bering through Friday evening.

$$

PKZ150-171230-
South of the AK Peninsula Sitkinak to Castle Cape-
332 PM AKDT Wed Aug 16 2017

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

.TONIGHT...W wind 25 kt. Seas 9 ft. Rain showers.
.THU...W wind 25 kt. Seas 10 ft.
.THU NIGHT...W wind 25 kt. Seas 10 ft.
.FRI AND FRI NIGHT...W wind 20 kt. Seas 8 ft.
.SAT...S wind 20 kt. Seas 8 ft.
.SUN...NW wind 25 kt. Seas 9 ft.
.MON...NW wind 20 kt. Seas 7 ft.

$$

PKZ155-171230-
South of the AK Peninsula Castle Cape to Cape Sarichef-
332 PM AKDT Wed Aug 16 2017

...GALE WARNING THROUGH THURSDAY...

.TONIGHT...W wind 25 kt...except increasing to 35 kt W of the 
Shumagin Islands after midnight. Seas 11 ft.
.THU...W wind 25 kt...except 35 kt W of the Shumagin Islands in the
morning. Seas 11 ft.
.THU NIGHT...W wind 25 kt. Seas 10 ft.
.FRI...W wind 25 kt. Seas 8 ft.
.FRI NIGHT...S wind 20 kt. Seas 5 ft.
.SAT...E wind 20 kt. Seas 9 ft.
.SUN THROUGH MON...NW wind 20 kt. Seas 8 ft.

$$

PKZ160-171230-
Bristol Bay-
332 PM AKDT Wed Aug 16 2017

.TONIGHT...W wind 20 kt. Seas 5 ft. Patchy fog after midnight.
.THU...SW wind 10 kt increasing to 15 kt in the afternoon. Seas
6 ft. Patchy morning fog.
.THU NIGHT...W wind 20 kt. Seas 6 ft. Patchy fog.
.FRI...W wind 15 kt. Seas 6 ft.
.FRI NIGHT...W wind 10 kt. Seas 4 ft.
.SAT THROUGH MON...NW wind 20 kt. Seas 5 ft.

$$

PKZ165-171230-
Port Heiden to Cape Sarichef-
332 PM AKDT Wed Aug 16 2017

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

.TONIGHT...W wind 30 kt. Seas 11 ft. Rain.
.THU...W wind 30 kt. Seas 13 ft.
.THU NIGHT...W wind 25 kt. Seas 11 ft.
.FRI...W wind 20 kt. Seas 9 ft.
.FRI NIGHT...Variable wind 10 kt. Seas 6 ft.
.SAT...NE wind 20 kt. Seas 5 ft.
.SUN...N wind 20 kt. Seas 5 ft.
.MON...NW wind 15 kt. Seas 5 ft.

$$

PKZ170-171230-
Cape Sarichef to Nikolski Bering Side-
332 PM AKDT Wed Aug 16 2017

...GALE WARNING TONIGHT...

.TONIGHT...W wind 25 kt increasing to 35 kt after midnight. Seas 14 
ft.
.THU...W wind 35 kt diminishing to 25 kt in the afternoon. Seas 14 
ft.
.THU NIGHT...W wind 25 kt. Seas 11 ft.
.FRI...SW wind 20 kt. Seas 8 ft.
.FRI NIGHT...E wind 15 kt. Seas 6 ft.
.SAT...NE wind 20 kt. Seas 7 ft.
.SUN...N wind 20 kt. Seas 7 ft.
.MON...Variable wind 10 kt. Seas 4 ft.

$$

PKZ171-171230-
Unalaska Bay-
332 PM AKDT Wed Aug 16 2017

...GALE WARNING THROUGH THURSDAY...

.TONIGHT...W wind 25 kt increasing to 35 kt after midnight. Seas 5 
ft. Rain.
.THU...W wind 35 kt diminishing to 25 kt in the afternoon. Seas
5 ft.
.THU NIGHT...W wind 25 kt becoming SW 15 kt after midnight. Seas
3 ft.
.FRI...S wind 10 kt. Seas 2 ft.
.FRI NIGHT...SE wind 10 kt. Seas 2 ft.
.SAT...NE wind 10 kt. Seas 3 ft.
.SUN...N wind 10 kt. Seas 3 ft.
.MON...Variable wind less than 10 kt. Seas 3 ft.

$$

PKZ172-171230-
Cape Sarichef to Nikolski Pacific Side-
332 PM AKDT Wed Aug 16 2017

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

.TONIGHT...W wind 30 kt. Seas 10 ft.
.THU...W wind 30 kt. Seas 10 ft.
.THU NIGHT...W wind 25 kt. Seas 8 ft.
.FRI...SW wind 20 kt. Seas 6 ft.
.FRI NIGHT...SE wind 20 kt. Seas 8 ft.
.SAT...NE wind 20 kt. Seas 8 ft.
.SUN...N wind 20 kt. Seas 8 ft.
.MON...NW wind 15 kt. Seas 5 ft.

$$

PKZ173-171230-
Nikloski to Seguam Island Bering Side-
332 PM AKDT Wed Aug 16 2017

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

.TONIGHT...W wind 30 kt. Seas 12 ft.
.THU...W wind 30 kt. Seas 13 ft.
.THU NIGHT...W wind 20 kt. Seas 10 ft. Patchy fog.
.FRI...SE wind 15 kt. Seas 7 ft.
.FRI NIGHT...NE wind 15 kt. Seas 7 ft.
.SAT THROUGH SUN...NE wind 15 kt. Seas 7 ft.
.MON...Variable wind 10 kt. Seas 3 ft.

$$

PKZ174-171230-
Nikolski to Seguam Island Pacific Side-
332 PM AKDT Wed Aug 16 2017

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

.TONIGHT...W wind 30 kt. Seas 9 ft.
.THU...W wind 25 kt. Seas 9 ft. Patchy fog.
.THU NIGHT...SW wind 15 kt. Seas 8 ft. Patchy fog.
.FRI...SE wind 25 kt. Seas 10 ft.
.FRI NIGHT...E wind 20 kt. Seas 9 ft.
.SAT...NE wind 20 kt. Seas 8 ft.
.SUN...N wind 15 kt. Seas 6 ft.
.MON...Variable wind 10 kt. Seas 4 ft.

$$

PKZ175-171230-
Seguam Island to Adak Bering Side-
332 PM AKDT Wed Aug 16 2017

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

.TONIGHT...W wind 25 kt. Seas 10 ft. Patchy fog.
.THU...W wind 25 kt. Seas 10 ft. Patchy fog.
.THU NIGHT...SW wind 15 kt. Seas 8 ft. Patchy fog.
.FRI AND FRI NIGHT...N wind 15 kt. Seas 6 ft.
.SAT...N wind 15 kt. Seas 6 ft.
.SUN...E wind 15 kt. Seas 7 ft.
.MON...Variable wind 10 kt. Seas 4 ft.

$$

PKZ176-171230-
Seguam Island to Adak Pacific Side-
332 PM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THURSDAY NIGHT...

.TONIGHT...W wind 20 kt. Seas 6 ft. Patchy fog.
.THU...W wind 20 kt. Seas 6 ft. Patchy fog.
.THU NIGHT...S wind 15 kt becoming E 25 kt after midnight. Seas
8 ft. Patchy fog.
.FRI...NE wind 25 kt. Seas 10 ft.
.FRI NIGHT...N wind 25 kt. Seas 9 ft.
.SAT...NW wind 20 kt. Seas 7 ft.
.SUN...Variable wind 10 kt. Seas 5 ft.
.MON...Variable wind 10 kt. Seas 3 ft.

$$

PKZ177-171230-
Adak to Kiska-
332 PM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THURSDAY NIGHT...

.TONIGHT...W wind 20 kt. Seas 6 ft. Patchy fog.
.THU...SW wind 15 kt. Seas 7 ft. Patchy fog.
.THU NIGHT...N wind 20 kt. Seas 9 ft. Patchy fog.
.FRI...N wind 20 kt. Seas 9 ft.
.FRI NIGHT...NW wind 15 kt. Seas 7 ft.
.SAT...N wind 15 kt. Seas 5 ft.
.SUN...SE wind 15 kt. Seas 7 ft.
.MON...Variable wind 10 kt. Seas 4 ft.

$$

PKZ178-171230-
Kiska to Attu-
332 PM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THURSDAY NIGHT...

.TONIGHT...SW wind 15 kt. Seas 5 ft. Patchy fog.
.THU...SW wind 15 kt. Seas 6 ft. Patchy fog.
.THU NIGHT...NW wind 15 kt. Seas 8 ft. Patchy fog.
.FRI AND FRI NIGHT...NW wind 15 kt. Seas 7 ft.
.SAT...N wind 15 kt. Seas 5 ft.
.SUN...SE wind 15 kt. Seas 6 ft.
.MON...Variable wind 10 kt. Seas 4 ft.

$$

PKZ179-171230-
Pribilof Islands Near Shore Waters-
332 PM AKDT Wed Aug 16 2017

...GALE WARNING TONIGHT...

.TONIGHT...W wind 25 kt increasing to 35 kt in the evening. Seas 15 
ft.
.THU...W wind 30 kt. Seas 14 ft.
.THU NIGHT...W wind 20 kt. Seas 10 ft.
.FRI...SW wind 15 kt. Seas 7 ft.
.FRI NIGHT...E wind 15 kt. Seas 4 ft.
.SAT...NE wind 15 kt. Seas 5 ft.
.SUN...NW wind 15 kt. Seas 4 ft.
.MON...Variable wind 10 kt. Seas 4 ft.

$$

PKZ180-171230-
Kuskokwim Delta and Etolin Strait-
332 PM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THURSDAY...

.TONIGHT...NW wind 20 kt becoming SW by midnight. Seas 6 ft. Patchy 
fog after midnight.
.THU...W wind 20 kt. Seas 8 ft.
.THU NIGHT...W wind 15 kt. Seas 7 ft. Patchy fog.
.FRI...N wind 15 kt. Seas 6 ft.
.FRI NIGHT...N wind 10 kt. Seas 4 ft.
.SAT...N wind 20 kt. Seas 4 ft.
.SUN...NW wind 20 kt. Seas 5 ft.
.MON...NW wind 15 kt. Seas 5 ft.

$$

PKZ181-171230-
North and West of Nunivak Island-
332 PM AKDT Wed Aug 16 2017

.TONIGHT...NW wind 20 kt becoming SW by midnight. Seas 6 ft. Patchy 
fog after midnight.
.THU...NW wind 15 kt. Seas 7 ft.
.THU NIGHT...NW wind 15 kt. Seas 5 ft. Patchy fog.
.FRI AND FRI NIGHT...N wind 15 kt. Seas 5 ft.
.SAT...N wind 15 kt. Seas 3 ft.
.SUN THROUGH MON...W wind 15 kt. Seas 5 ft.

$$

PKZ185-171230-
Saint Matthew Island Waters-
332 PM AKDT Wed Aug 16 2017

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

.TONIGHT...W wind 30 kt. Seas 11 ft.
.THU...E of Saint Matthew Island, N wind 15 kt. W of Saint Matthew
Island, NW wind 25 kt becoming NE 15 kt in the afternoon. Seas
10 ft.
.THU NIGHT...NE wind 15 kt. Seas 7 ft.
.FRI AND FRI NIGHT...NE wind 15 kt. Seas 5 ft.
.SAT...NW wind 15 kt. Seas 4 ft.
.SUN...W wind 20 kt. Seas 6 ft.
.MON...W wind 15 kt. Seas 5 ft.

$$

775 
FZAK52 PAFC 171121
CWFALU

Coastal Waters Forecast
National Weather Service Anchorage Alaska
321 AM AKDT Thu Aug 17 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.

PKZ199-180045-
321 AM AKDT Thu Aug 17 2017
.SYNOPSIS FOR SOUTHWEST ALASKA+BRISTOL BAY+THE ALASKA
PENINSULA WATERS AND THE ALEUTIAN ISLANDS...

Bogoslof volcano, 53 nm northwest of Dutch Harbor, is currently 
active. 

A 997 mb low will move to 40 NM west of Mekoryuk this morning and
dissipate over Bristol Bay late tonight. A 1000 mb low will move 
to 150 NM south of Adak Fri morning and strengthen to 998 mb as 
it moves to 130 NM south of Atka late Fri. A broad trough of low 
pressure will remain across the Bering Sea through the period.

$$

PKZ150-180045-
South of the AK Peninsula Sitkinak to Castle Cape-
321 AM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY THROUGH FRIDAY...

.TODAY...W wind 25 kt. Seas 9 ft.
.TONIGHT...W wind 25 kt. Seas 9 ft.
.FRI...W wind 20 kt. Seas 8 ft.
.FRI NIGHT...W wind 20 kt. Seas 7 ft.
.SAT...S wind 15 kt. Seas 5 ft.
.SUN...N wind 20 kt. Seas 7 ft.
.MON...NW wind 25 kt. Seas 9 ft.

$$

PKZ155-180045-
South of the AK Peninsula Castle Cape to Cape Sarichef-
321 AM AKDT Thu Aug 17 2017

...GALE WARNING TODAY...

.TODAY...W wind 35 kt. Seas 11 ft.
.TONIGHT...W wind 25 kt. Seas 10 ft.
.FRI...W wind 25 kt. Seas 8 ft.
.FRI NIGHT...SW wind 20 kt. Seas 6 ft.
.SAT...NE wind 20 kt. Seas 6 ft.
.SUN THROUGH MON...NW wind 20 kt. Seas 6 ft.

$$

PKZ160-180045-
Bristol Bay-
321 AM AKDT Thu Aug 17 2017

.TODAY...SW wind 10 kt increasing to 15 kt in the afternoon. Seas
5 ft. Patchy fog.
.TONIGHT...SW wind 15 kt. Seas 6 ft. Patchy fog.
.FRI...W wind 15 kt. Seas 5 ft. Patchy fog.
.FRI NIGHT...W wind 10 kt. Seas 4 ft.
.SAT THROUGH SUN...N wind 15 kt. Seas 4 ft.
.MON...NW wind 20 kt. Seas 5 ft.

$$

PKZ165-180045-
Port Heiden to Cape Sarichef-
321 AM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY THROUGH FRIDAY...

.TODAY...W wind 30 kt. Seas 12 ft.
.TONIGHT...W wind 25 kt. Seas 11 ft.
.FRI...W wind 20 kt. Seas 8 ft.
.FRI NIGHT...Variable wind 10 kt. Seas 6 ft.
.SAT THROUGH MON...NW wind 20 kt. Seas 5 ft.

$$

PKZ170-180045-
Cape Sarichef to Nikolski Bering Side-
321 AM AKDT Thu Aug 17 2017

...GALE WARNING TODAY...

.TODAY...W wind 35 kt. Seas 14 ft.
.TONIGHT...W wind 25 kt. Seas 11 ft.
.FRI...SW wind 20 kt. Seas 8 ft.
.FRI NIGHT...E wind 15 kt. Seas 5 ft.
.SAT...NE wind 20 kt. Seas 4 ft.
.SUN THROUGH MON...NE wind 15 kt. Seas 4 ft.

$$

PKZ171-180045-
Unalaska Bay-
321 AM AKDT Thu Aug 17 2017

...GALE WARNING TODAY...

.TODAY...W wind 35 kt diminishing to 25 kt in the afternoon. Seas
5 ft.
.TONIGHT...W wind 25 kt becoming SW 15 kt after midnight. Seas 3
ft.
.FRI...SW wind 10 kt in the morning becoming variable less than
10 kt. Seas 2 ft.
.FRI NIGHT...SE wind 10 kt. Seas 2 ft.
.SAT...NE wind 10 kt. Seas 3 ft.
.SUN...N wind 10 kt. Seas 3 ft.
.MON...Variable wind less than 10 kt. Seas 2 ft.

$$

PKZ172-180045-
Cape Sarichef to Nikolski Pacific Side-
321 AM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...W wind 30 kt. Seas 10 ft.
.TONIGHT...W wind 25 kt. Seas 8 ft.
.FRI...SW wind 20 kt. Seas 5 ft.
.FRI NIGHT...SE wind 20 kt. Seas 7 ft.
.SAT...NE wind 15 kt. Seas 7 ft.
.SUN THROUGH MON...NW wind 15 kt. Seas 5 ft.

$$

PKZ173-180045-
Nikloski to Seguam Island Bering Side-
321 AM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...W wind 30 kt. Seas 12 ft.
.TONIGHT...W wind 20 kt. Seas 10 ft. Patchy fog.
.FRI...E wind 20 kt. Seas 6 ft.
.FRI NIGHT...E wind 20 kt. Seas 6 ft.
.SAT...NE wind 20 kt. Seas 5 ft.
.SUN...Variable wind 10 kt. Seas 4 ft.
.MON...SE wind 15 kt. Seas 4 ft.

$$

PKZ174-180045-
Nikolski to Seguam Island Pacific Side-
321 AM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY TODAY AND FRIDAY...

.TODAY...W wind 25 kt. Seas 9 ft. Patchy fog.
.TONIGHT...SW wind 15 kt. Seas 7 ft. Patchy fog.
.FRI...SE wind 20 kt. Seas 9 ft. Rain.
.FRI NIGHT...E wind 20 kt. Seas 9 ft.
.SAT...NE wind 20 kt. Seas 8 ft.
.SUN...Variable wind 10 kt. Seas 6 ft.
.MON...SE wind 15 kt. Seas 4 ft.

$$

PKZ175-180045-
Seguam Island to Adak Bering Side-
321 AM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...W wind 25 kt. Seas 10 ft. Patchy fog.
.TONIGHT...SW wind 15 kt. Seas 8 ft. Patchy fog.
.FRI...NE wind 20 kt. Seas 5 ft.
.FRI NIGHT...NE wind 20 kt. Seas 5 ft.
.SAT...N wind 20 kt. Seas 5 ft.
.SUN...Variable wind 10 kt. Seas 4 ft.
.MON...SE wind 20 kt. Seas 4 ft.

$$

PKZ176-180045-
Seguam Island to Adak Pacific Side-
321 AM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY TONIGHT AND FRIDAY...

.TODAY...W wind 20 kt. Seas 5 ft. Patchy fog.
.TONIGHT...SE wind 15 kt becoming E 25 kt after midnight. Seas 7
ft. Patchy fog.
.FRI...E wind 25 kt. Seas 10 ft. Rain.
.FRI NIGHT...NE wind 20 kt. Seas 9 ft.
.SAT...N wind 20 kt. Seas 7 ft.
.SUN...Variable wind 10 kt. Seas 4 ft.
.MON...SE wind 20 kt. Seas 7 ft.

$$

PKZ177-180045-
Adak to Kiska-
321 AM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY TONIGHT AND FRIDAY...

.TODAY...SW wind 15 kt. Seas 7 ft. Patchy fog.
.TONIGHT...N wind 20 kt. Seas 8 ft. Patchy fog.
.FRI...N wind 20 kt. Seas 8 ft. Patchy fog.
.FRI NIGHT...N wind 20 kt. Seas 7 ft.
.SAT...N wind 20 kt. Seas 5 ft.
.SUN...SE wind 20 kt. Seas 4 ft.
.MON...S wind 25 kt. Seas 9 ft.

$$

PKZ178-180045-
Kiska to Attu-
321 AM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY TONIGHT AND FRIDAY...

.TODAY...SW wind 15 kt. Seas 5 ft. Patchy fog.
.TONIGHT...NW wind 15 kt. Seas 8 ft. Patchy fog.
.FRI...NW wind 15 kt. Seas 8 ft. Patchy fog.
.FRI NIGHT...NW wind 20 kt. Seas 6 ft.
.SAT...N wind 15 kt. Seas 5 ft.
.SUN...E wind 20 kt. Seas 4 ft.
.MON...SE wind 20 kt. Seas 8 ft.

$$

PKZ179-180045-
Pribilof Islands Near Shore Waters-
321 AM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...W wind 30 kt. Seas 13 ft.
.TONIGHT...W wind 20 kt. Seas 9 ft. Rain.
.FRI...W wind 15 kt. Seas 7 ft.
.FRI NIGHT...E wind 15 kt. Seas 4 ft.
.SAT THROUGH SUN...N wind 15 kt. Seas 4 ft.
.MON...E wind 15 kt. Seas 4 ft.

$$

PKZ180-180045-
Kuskokwim Delta and Etolin Strait-
321 AM AKDT Thu Aug 17 2017

.TODAY...W wind 20 kt. Seas 7 ft.
.TONIGHT...W wind 15 kt. Seas 7 ft. Patchy fog.
.FRI...N wind 10 kt. Seas 6 ft. Patchy fog.
.FRI NIGHT...N wind 10 kt. Seas 4 ft.
.SAT THROUGH SUN...N wind 15 kt. Seas 4 ft.
.MON...NW wind 20 kt. Seas 4 ft.

$$

PKZ181-180045-
North and West of Nunivak Island-
321 AM AKDT Thu Aug 17 2017

.TODAY...NW wind 15 kt. Seas 7 ft.
.TONIGHT...NW wind 15 kt. Seas 6 ft. Patchy fog.
.FRI...Variable wind 10 kt. Seas 4 ft.
.FRI NIGHT...Variable wind 10 kt. Seas 4 ft.
.SAT THROUGH MON...NW wind 15 kt. Seas 4 ft.

$$

PKZ185-180045-
Saint Matthew Island Waters-
321 AM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY TODAY...

.TODAY...E of Saint Matthew Island, N wind 15 kt. W of Saint
Matthew Island, NW wind 25 kt becoming NE 15 kt in the afternoon. 
Seas 9 ft.
.TONIGHT...NE wind 15 kt. Seas 6 ft.
.FRI...NE wind 15 kt. Seas 5 ft. Patchy fog.
.FRI NIGHT...Variable wind 10 kt. Seas 4 ft.
.SAT...Variable wind 10 kt. Seas 4 ft.
.SUN...Variable wind 10 kt. Seas 4 ft.
.MON...SW wind 15 kt. Seas 4 ft.

$$

544 
FZAK52 PAFC 172330
CWFALU

Coastal Waters Forecast
National Weather Service Anchorage Alaska
330 PM AKDT Thu Aug 17 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.

PKZ199-181230-
330 PM AKDT Thu Aug 17 2017
.SYNOPSIS FOR SOUTHWEST ALASKA+BRISTOL BAY+THE ALASKA
PENINSULA WATERS AND THE ALEUTIAN ISLANDS...

Bogoslof volcano, 53 nm northwest of Dutch Harbor, is currently 
active. 

A 1006 mb low 435 nm east of Saint Paul will dissipate Friday 
afternoon. A broad trough of low pressure remains across the Bering 
Sea through the period.


$$

PKZ150-181230-
South of the AK Peninsula Sitkinak to Castle Cape-
330 PM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY THROUGH FRIDAY...

.TONIGHT...W wind 25 kt. Seas 10 ft.
.FRI...W wind 20 kt. Seas 8 ft.
.FRI NIGHT...W wind 20 kt. Seas 7 ft.
.SAT...S wind 15 kt. Seas 5 ft.
.SAT NIGHT...NE wind 15 kt. Seas 5 ft.
.SUN...NW wind 20 kt. Seas 7 ft.
.MON...NW wind 25 kt. Seas 9 ft.
.TUE...W wind 15 kt. Seas 6 ft.

$$

PKZ155-181230-
South of the AK Peninsula Castle Cape to Cape Sarichef-
330 PM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY THROUGH FRIDAY...

.TONIGHT...W wind 30 kt. Seas 10 ft. Rain. 
.FRI...W wind 20 kt. Seas 8 ft.
.FRI NIGHT...SW wind 15 kt. Seas 6 ft.
.SAT...E wind 15 kt. Seas 6 ft.
.SAT NIGHT...NE wind 15 kt. Seas 6 ft.
.SUN THROUGH MON...NW wind 20 kt. Seas 6 ft.
.TUE...W wind 15 kt. Seas 4 ft.

$$

PKZ160-181230-
Bristol Bay-
330 PM AKDT Thu Aug 17 2017

.TONIGHT...W wind 20 kt. Seas 6 ft. Rain. Patchy fog.
.FRI...W wind 15 kt. Seas 5 ft. Patchy fog.
.FRI NIGHT...W wind 15 kt diminishing to 10 kt after midnight.
Seas 4 ft. Patchy fog.
.SAT...NE wind 10 kt. Seas 3 ft.
.SAT NIGHT...NW wind 15 kt. Seas 3 ft.
.SUN THROUGH MON...NW wind 20 kt. Seas 5 ft.
.TUE...W wind 10 kt. Seas 3 ft.

$$

PKZ165-181230-
Port Heiden to Cape Sarichef-
330 PM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY THROUGH FRIDAY...

.TONIGHT...W wind 30 kt. Seas 11 ft. Rain. Patchy fog.
.FRI...W wind 20 kt. Seas 9 ft. Patchy fog.
.FRI NIGHT...Variable wind 10 kt. Seas 6 ft. Patchy fog.
.SAT AND SAT NIGHT...N wind 15 kt. Seas 4 ft.
.SUN THROUGH MON...NW wind 20 kt. Seas 5 ft.
.TUE...Variable wind 10 kt. Seas 4 ft.

$$

PKZ170-181230-
Cape Sarichef to Nikolski Bering Side-
330 PM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY THROUGH FRIDAY...

.TONIGHT...W wind 25 kt. Seas 11 ft. Patchy fog.
.FRI...SW wind 20 kt. Seas 8 ft. Patchy fog.
.FRI NIGHT...E wind 15 kt. Seas 5 ft.
.SAT AND SAT NIGHT...NE wind 15 kt. Seas 4 ft.
.SUN THROUGH MON...NE wind 15 kt. Seas 4 ft.
.TUE...S wind 15 kt. Seas 4 ft.

$$

PKZ171-181230-
Unalaska Bay-
330 PM AKDT Thu Aug 17 2017

.TONIGHT...W wind 20 kt. Seas 3 ft. Patchy fog.
.FRI...Variable wind less than 10 kt. Seas 2 ft. Patchy fog.
.FRI NIGHT...SE wind 10 kt. Seas 2 ft.
.SAT...E wind 10 kt. Seas 2 ft.
.SAT NIGHT...NE wind 10 kt. Seas 3 ft.
.SUN...N wind 10 kt. Seas 3 ft.
.MON THROUGH MON...Variable wind less than 10 kt. Seas 2 ft.

$$

PKZ172-181230-
Cape Sarichef to Nikolski Pacific Side-
330 PM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY TONIGHT...

.TONIGHT...W wind 25 kt. Seas 8 ft. Patchy fog.
.FRI...S wind 20 kt. Seas 5 ft. Patchy fog.
.FRI NIGHT...SE wind 20 kt. Seas 7 ft.
.SAT...E wind 15 kt. Seas 7 ft.
.SAT NIGHT...NE wind 15 kt. Seas 7 ft.
.SUN...N wind 20 kt. Seas 6 ft.
.MON...NW wind 15 kt. Seas 4 ft.
.TUE...SW wind 15 kt. Seas 3 ft.

$$

PKZ173-181230-
Nikloski to Seguam Island Bering Side-
330 PM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY TONIGHT...

.TONIGHT...SW wind 20 kt. Seas 10 ft. Patchy fog.
.FRI...E wind 20 kt. Seas 7 ft. Patchy fog.
.FRI NIGHT...E wind 20 kt. Seas 6 ft.
.SAT...NE wind 20 kt. Seas 5 ft.
.SAT NIGHT...N wind 15 kt. Seas 5 ft.
.SUN...NE wind 15 kt. Seas 4 ft.
.MON...SE wind 15 kt. Seas 4 ft.
.TUE...S wind 15 kt. Seas 5 ft.

$$

PKZ174-181230-
Nikolski to Seguam Island Pacific Side-
330 PM AKDT Thu Aug 17 2017

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

.TONIGHT...S wind 20 kt. Seas 8 ft. Patchy fog. Rain.
.FRI...SE wind 25 kt. Seas 9 ft. Patchy fog. Rain.
.FRI NIGHT...E wind 20 kt. Seas 9 ft. Rain.
.SAT...E wind 20 kt. Seas 8 ft.
.SAT NIGHT...N wind 15 kt. Seas 7 ft.
.SUN...N wind 15 kt. Seas 6 ft.
.MON...SE wind 15 kt. Seas 4 ft.
.TUE...SW wind 20 kt. Seas 6 ft.

$$

PKZ175-181230-
Seguam Island to Adak Bering Side-
330 PM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY TONIGHT...

.TONIGHT...W wind 15 kt in the evening becoming Variable 10 kt. Seas
8 ft. Patchy fog.
.FRI...NE wind 20 kt. Seas 6 ft. Patchy fog.
.FRI NIGHT...NE wind 20 kt. Seas 5 ft.
.SAT...N wind 20 kt. Seas 5 ft.
.SAT NIGHT...N wind 15 kt. Seas 4 ft.
.SUN...Variable wind 10 kt. Seas 4 ft.
.MON...SE wind 20 kt. Seas 4 ft.
.TUE...SW wind 20 kt. Seas 5 ft.

$$

PKZ176-181230-
Seguam Island to Adak Pacific Side-
330 PM AKDT Thu Aug 17 2017

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

.TONIGHT...Variable wind 10 kt becoming E 25 kt late evening. Seas
5 ft building to 9 ft by midnight. Patchy fog. Rain.
.FRI...E wind 25 kt. Seas 10 ft. Patchy fog. Rain.
.FRI NIGHT...NE wind 20 kt. Seas 9 ft. Rain.
.SAT...N wind 20 kt. Seas 7 ft.
.SAT NIGHT...N wind 15 kt. Seas 6 ft.
.SUN...Variable wind 10 kt. Seas 4 ft.
.MON...SE wind 20 kt. Seas 7 ft.
.TUE...SW wind 20 kt. Seas 7 ft.

$$

PKZ177-181230-
Adak to Kiska-
330 PM AKDT Thu Aug 17 2017

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

.TONIGHT...N wind 20 kt. Seas 9 ft. Patchy fog.
.FRI...N wind 20 kt. Seas 9 ft. Patchy fog.
.FRI NIGHT...N wind 25 kt. Seas 7 ft. Patchy fog.
.SAT...N wind 20 kt. Seas 5 ft.
.SAT NIGHT...Variable wind 10 kt. Seas 4 ft.
.SUN...SE wind 20 kt. Seas 4 ft.
.MON...S wind 25 kt. Seas 9 ft.
.TUE...SW wind 25 kt. Seas 9 ft.

$$

PKZ178-181230-
Kiska to Attu-
330 PM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY THROUGH FRIDAY...

.TONIGHT...NW wind 15 kt. Seas 8 ft. Patchy fog.
.FRI...NW wind 15 kt. Seas 8 ft. Patchy fog.
.FRI NIGHT...NW wind 20 kt. Seas 6 ft. Patchy fog.
.SAT...NW wind 20 kt. Seas 5 ft.
.SAT NIGHT...Variable wind 10 kt. Seas 3 ft.
.SUN...SE wind 20 kt. Seas 4 ft.
.MON...SE wind 20 kt. Seas 8 ft.
.TUE...W wind 20 kt. Seas 10 ft.

$$

PKZ179-181230-
Pribilof Islands Near Shore Waters-
330 PM AKDT Thu Aug 17 2017

...SMALL CRAFT ADVISORY TONIGHT...

.TONIGHT...W wind 20 kt. Seas 10 ft. Patchy fog. Rain.
.FRI...W wind 15 kt. Seas 7 ft. Patchy fog.
.FRI NIGHT...Variable wind 10 kt becoming E 15 kt by midnight. Seas 
4 ft. Areas of fog.
.SAT AND SAT NIGHT...NE wind 15 kt. Seas 4 ft.
.SUN...Variable wind 10 kt. Seas 4 ft.
.MON...E wind 15 kt. Seas 4 ft.
.TUE...SE wind 15 kt. Seas 4 ft.

$$

PKZ180-181230-
Kuskokwim Delta and Etolin Strait-
330 PM AKDT Thu Aug 17 2017

.TONIGHT...Variable wind 10 kt becoming NW 15 kt late evening. Seas 
7 ft. Patchy fog.
.FRI...N wind 10 kt. Seas 5 ft. Patchy fog.
.FRI NIGHT...N wind 10 kt. Seas 4 ft. Patchy fog.
.SAT...N wind 15 kt. Seas 3 ft.
.SAT NIGHT...N wind 20 kt. Seas 4 ft.
.SUN THROUGH MON...NW wind 20 kt. Seas 4 ft.
.TUE...W wind 10 kt. Seas 3 ft.

$$

PKZ181-181230-
North and West of Nunivak Island-
330 PM AKDT Thu Aug 17 2017

.TONIGHT...Variable wind 10 kt becoming N 15 kt late evening. Seas
5 ft. Patchy fog.
.FRI...Variable wind 10 kt. Seas 5 ft. Patchy fog.
.FRI NIGHT...Variable wind 10 kt. Seas 4 ft. Patchy fog.
.SAT AND SAT NIGHT...N wind 15 kt. Seas 3 ft.
.SUN THROUGH MON...NW wind 15 kt. Seas 4 ft.
.TUE...Variable wind 10 kt. Seas 4 ft.

$$

PKZ185-181230-
Saint Matthew Island Waters-
330 PM AKDT Thu Aug 17 2017

.TONIGHT...N wind 15 kt. Seas 6 ft. Patchy fog.
.FRI...E wind 15 kt. Seas 5 ft. Patchy fog.
.FRI NIGHT...Variable wind 10 kt. Seas 4 ft. Areas of fog.
.SAT THROUGH SUN...Variable wind 10 kt. Seas 4 ft.
.MON...SW wind 15 kt. Seas 4 ft.
.TUE...SE wind 15 kt. Seas 4 ft.

$$

Southcentral and Southwest Alaska Forecast Discussion
National Weather Service Anchorage AK
355 AM AKDT Tue Aug 15 2017

.ANALYSIS AND UPPER LEVELS...

The upper levels consist of an upper trough over the Central
Bering Sea with a mobile shortwave trough along the subtropical
jet stream propagating eastward, just to the south of Kodiak
Island. Weak, almost flat ridging, has built in across
Southcentral behind a weakening trough over the Yukon. Beyond some
rogue showers over the the interior mountains across Southwest
Alaska and along the Alaska Range/Talkeetna Mountains, rather
quiescent weather dominates the southern mainland of Alaska. Weak
upper flow and the presence of an inversion, however, is keeping a
rather extensive deck of mid level stratus (5000-8000 ft) over
most of the region.

&&

.MODEL DISCUSSION...
The suite of dynamic numerical weather models are in excellent
agreement with all the main synoptic features through Thursday
evening. Forecast confidence is very high. The main theme to this
forecast is wetter weather will once again ensue as a deep
longwave trough forms over Alaska.

&&

.AVIATION...
PANC...VFR conditions will persist before rain begins to move in
overnight and Wednesday morning with CIGS dropping to 3000-5000 ft.
The Turnagain arm wind will continue to impact the terminal with
gusty winds through this morning before diminishing this afternoon.

&&

.SHORT TERM FORECAST SOUTHCENTRAL ALASKA (Days 1 and 2)...
Weak upper waves embedded in the southwesterly flow aloft will
give rise to a few showers across Southcentral today. However,
there will also be numerous breaks in the cloud cover allowing
afternoon temperatures to rise into the 60s in spots inland.

A large upper trough moves over the Southwest mainland late
tonight then takes on a negative tilt as it digs southeast over the
western Gulf late Wednesday. Although not as potent as last
weekends system, broad southerly flow with this feature ushers in
widespread rain/showers to Southcentral on Wednesday. Rainfall
amounts of .1-.5 inches inland (higher on upslope areas in the
Susitna Valley) and 1-2 inches along the coasts are possible by
the end of the day Wednesday. As the surface trough moves east,
pressure gradients will respond and increase southerly flow over
the western Gulf and ramp up gap winds across Turnagain Arm and
the Copper River Basin on Wednesday.

&&

.SHORT TERM FORECAST SOUTHWEST ALASKA (Days 1 and 2)...
Cloudy and unstable conditions will continue across much of the
Southwest mainland for the short term, with the exception of
onshore flow bringing more stable conditions and fog into the
Kuskokwim Delta and Bristol Bay area this morning. A fairly weak
upper low continues to support some lingering light showers
across areas surrounding the Kilbuck mountains. More widespread
rainfall is anticipated Wednesday through Thursday as the upper
low over the central Bering pushes eastward across the Alaska
Peninsula, and a separate upper level wave dives southward towards
the Kuskokwim Delta.

&&

.SHORT TERM FORECAST BERING SEA/ALEUTIANS (Days 1 and 2)...
Throughout the short term, surface high pressure will maintain
hold over the southern and western Bering, while a trough will
remain over the eastern Bering and Bristol Bay area. A low level
jet will develop between these two features and support some gusty
winds winds and cold air advection. This will keep the lower
boundary layer well mixed and prevent fog from becoming too
widespread or dense over the eastern Aleutians/Bering and Alaska
Peninsula. By Wednesday morning, northwesterly flow along the
western periphery of the trough will begin to increase, with some
gale force winds developing over parts of the central and western
Bering Sea through Thursday morning.

&&

.LONG TERM FORECAST (Days 3 through 7)...
The models are still struggling with the timing of a closed upper
level low as it drops southward into the Southwest Alaska region
by approximately Thursday morning. The GFS models is the outlier
with this synoptic feature, and very progressive with its speed
of this system as it tracks eastward. By Thursday evening the
aforementioned closed upper level low is located over the western
Gulf before moving the lower Southeast Panhandle by Friday
afternoon. Meanwhile, upstream another shortwave drops down off
the Eastern Siberian region into the Southwest Alaska area. This
synoptic feature moves eastward before developing into a closed
upper level low over the northern Gulf by Sunday evening before
elongating, and extending into the lower Southeast Panhandle
region by Tuesday morning. As these aforementioned synoptic
features track through the AOR, look for the shortwaves to produce
a showery weather regime. Therefore, the forecast confidence is
below average with the continued timing, and intensity issues with
the closed upper level lows/troughs. Otherwise, look for
continued cooler, and wet conditions through the early part of
next week.

&&

.AFC WATCHES/WARNINGS/ADVISORIES...
PUBLIC...NONE.
MARINE...Gale 411 412.
FIRE WEATHER...NONE.

&&

SYNOPSIS AND MODEL DISCUSSION...Ahsenmacher (JA)
SOUTHCENTRAL ALASKA...RMC
SOUTHWEST ALASKA/BERING SEA/ALEUTIANS...TP
LONG TERM...PD

SPECIAL WEATHER STATEMENT...RESENT
National Weather Service ANCHORAGE AK
1106 AM AKDT Tue Aug 15 2017

AKZ145-152000-
Susitna Valley-
Including the cities of Talkeetna, Willow, and Cantwell
1106 AM AKDT Tue Aug 15 2017

...HIGH WATER ON THE BELUGA RIVER IN WESTERN COOK INLET...

High water on the Beluga River is resulting in significant debris
in the river and could accumulate at powerline bridge. A glacial
dammed lake release on Strandline Lake is unconfirmed at this time
but may be a contributing factor to the high water levels. The
more likely cause is heavy rain in the basin. While river levels
may drop some through Tuesday, additional rain beginning
Wednesday could cause the river to rise higher than the current
levels.