Alert archive / Alaska / Gale Warnings in 2016

Gale Warning 491, NWS Anchorage, AK

September 16, 2016

NWS Anchorage, AK issued this gale warning at Sep 16, 2016, 3:58 AM AKDT. It was in force for 61 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 16, 2016, 3:58 AM AKDT (11:58 UTC)
Expired
Sep 18, 2016, 4:45 PM AKDT
In force
61 hr
Issued by
NWS Anchorage, AK

The text

As transmitted.

522 
FZAK62 PAFC 161158
OFFALU

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
358 AM AKDT FRI SEP 16 2016

OFFSHORE WATERS FORECAST FOR THE BERING SEA

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.

PKZ499-170030-
358 AM AKDT FRI SEP 16 2016
.SYNOPSIS FOR CENTRAL BERING SEA...A 988 MB LOW NEAR 55N 158W WILL
WEAKEN AS IT MOVES INTO THE GULF BY FRI EVENING. HIGH PRESSURE
WILL BUILD OVER THE CENTRAL AND EASTERN BERING THROUGH SUN
MORNING. A 1008 MB KAMCHATKA LOW WILL STRENGTHEN TO 987 MB AS IT
MOVES TO 57N 168E EARLY SUN MORNING.

$$

PKZ411-170030-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE-
358 AM AKDT FRI SEP 16 2016

...GALE WARNING SATURDAY...

.TODAY...VARIABLE WIND TO 20 KT. SEAS 8 FT.
.TONIGHT...SW WIND 10 TO 25 KT. SEAS 4 TO 7 FT.
.SAT...S WIND 10 TO 20 KT INCREASING TO 20 TO 35 KT IN THE
AFTERNOON. SEAS 4 TO 7 FT. PATCHY FOG. RAIN.
.SAT NIGHT...S WIND 25 TO 40 KT. SEAS 8 TO 13 FT.
.SUN...SW WIND 15 TO 30 KT. SEAS 10 TO 14 FT.
.MON THROUGH TUE...NW WIND 15 TO 30 KT. SEAS 8 TO 13 FT.

$$

PKZ412-170030-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N-
358 AM AKDT FRI SEP 16 2016

.TODAY...NW WIND 15 TO 25 KT. SEAS 7 TO 11 FT.
.TONIGHT...NW WIND 15 TO 25 KT. SEAS 7 FT.
.SAT...SW WIND 10 TO 25 KT. SEAS 4 TO 7 FT.
.SAT NIGHT...S WIND 20 TO 35 KT. SEAS 5 TO 10 FT.
.SUN THROUGH MON...SW WIND 15 TO 30 KT. SEAS 8 TO 16 FT.
.TUE...W WIND 10 TO 25 KT. SEAS 7 TO 11 FT.

$$

PKZ413-170030-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N-
358 AM AKDT FRI SEP 16 2016

.TODAY...NW WIND 15 TO 25 KT. SEAS 9 FT.
.TONIGHT...W WIND 15 TO 25 KT. SEAS 5 TO 8 FT.
.SAT...SW WIND 15 TO 25 KT. SEAS 5 TO 8 FT.
.SAT NIGHT...SW WIND 20 TO 35 KT. SEAS 7 TO 12 FT.
.SUN THROUGH TUE...W WIND 20 TO 35 KT. SEAS 8 TO 16 FT.

$$

PKZ414-170030-
BERING SEA OFFSHORE EAST OF 171W-
358 AM AKDT FRI SEP 16 2016

...GALE WARNING TODAY...

.TODAY...NW WIND 20 TO 35 KT. SEAS 8 TO 11 FT.
.TONIGHT...NW WIND 20 TO 30 KT. SEAS 7 TO 10 FT.
.SAT...NW WIND 20 TO 30 KT. SEAS 6 TO 9 FT.
.SAT NIGHT...W WIND 15 TO 30 KT. SEAS 5 TO 8 FT.
.SUN THROUGH TUE...SW WIND 20 TO 35 KT. SEAS 7 TO 12 FT.

$$
4 follow-up statements
055 
FZAK62 PAFC 162259
OFFALU

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
259 PM AKDT FRI SEP 16 2016

OFFSHORE WATERS FORECAST FOR THE BERING SEA

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.

PKZ499-171245-
259 PM AKDT FRI SEP 16 2016
.SYNOPSIS FOR CENTRAL BERING SEA...
HIGH PRESSURE BUILDS OVER THE CENTRAL AND EASTERN BERING THROUGH
SUN MORNING. A 990 MB LOW NEAR KODIAK ISLAND MOVES EAST AND
WEAKENS INTO THE GULF SATURDAY. A 1008 MB KAMCHATKA LOW WILL
STRENGTHEN TO 987 MB AS IT MOVES TO 350 NM NORTHWEST OF SHEMYA
EARLY SUN MORNING. A 996 MB LOW NEAR 51N 165E SATURDAY MORNING
MOVES TO 57N 170E AT 969 MB SUNDAY AFTERNOON.

$$

PKZ411-171245-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE-
259 PM AKDT FRI SEP 16 2016

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

.TONIGHT...SW WIND 10 TO 25 KT. SEAS 4 TO 7 FT. PATCHY FOG.
.SAT...S WIND 10 TO 25 KT INCREASING TO 20 TO 35 KT IN THE
AFTERNOON. SEAS 5 TO 8 FT BUILDING TO 8 TO 13 FT. PATCHY FOG.
RAIN.
.SAT NIGHT...S WIND 25 TO 40 KT. SEAS 10 TO 16 FT. PATCHY FOG.
RAIN.
.SUN...SW WIND 15 TO 30 KT. SEAS 11 TO 16 FT.
.SUN NIGHT...SW WIND 20 TO 35 KT. SEAS 11 TO 18 FT.
.MON...W WIND 15 TO 30 KT. SEAS 11 TO 19 FT.
.TUE THROUGH WED...NW WIND 15 TO 25 KT. SEAS 7 TO 10 FT.

$$

PKZ412-171245-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N-
259 PM AKDT FRI SEP 16 2016

...GALE WARNING SATURDAY NIGHT...

.TONIGHT...NW WIND 15 TO 25 KT. SEAS 5 TO 8 FT.
.SAT...NW WIND 10 TO 25 KT BECOMING S 10 TO 20 KT IN THE
AFTERNOON. SEAS 4 TO 8 FT.
.SAT NIGHT...S WIND 20 TO 35 KT. SEAS 5 TO 10 FT BUILDING TO
9 TO 15 FT AFTER MIDNIGHT. PATCHY FOG.
.SUN...S WIND 20 TO 30 KT. SEAS 8 TO 16 FT.
.SUN NIGHT...S WIND 20 TO 35 KT. SEAS 12 TO 17 FT.
.MON...SW WIND 15 TO 30 KT. SEAS 11 TO 18 FT.
.TUE THROUGH WED...W WIND 10 TO 25 KT. SEAS 8 TO 13 FT.

$$

PKZ413-171245-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N-
259 PM AKDT FRI SEP 16 2016

...GALE WARNING SATURDAY NIGHT...

.TONIGHT...W WIND 15 TO 25 KT. SEAS 6 TO 8 FT.
.SAT...SW WIND 15 TO 25 KT. SEAS 6 TO 10 FT.
.SAT NIGHT...SW WIND 20 TO 35 KT. SEAS 10 TO 15 FT. PATCHY FOG.
.SUN...S WIND 25 TO 35 KT. SEAS 8 TO 16 FT.
.SUN NIGHT...SW WIND 20 TO 35 KT. SEAS 9 TO 16 FT.
.MON THROUGH WED...W WIND 15 TO 30 KT. SEAS 9 TO 15 FT.

$$

PKZ414-171245-
BERING SEA OFFSHORE EAST OF 171W-
259 PM AKDT FRI SEP 16 2016

.TONIGHT...NW WIND 20 TO 30 KT. SEAS 7 TO 11 FT.
.SAT...NW WIND 20 TO 30 KT. SEAS 7 TO 11 FT.
.SAT NIGHT...W WIND 15 TO 30 KT BECOMING SW 10 TO 20 KT AFTER
MIDNIGHT. SEAS 6 TO 11 FT.
.SUN...SW WIND 15 TO 30 KT. SEAS 5 TO 10 FT.
.SUN NIGHT...S WIND 20 TO 35 KT. SEAS 9 TO 14 FT.
.MON THROUGH WED...SW WIND 20 TO 35 KT. SEAS 9 TO 14 FT.

$$
088 
FZAK62 PAFC 171152
OFFALU

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
352 AM AKDT SAT SEP 17 2016

OFFSHORE WATERS FORECAST FOR THE BERING SEA

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.

PKZ499-180030-
352 AM AKDT SAT SEP 17 2016
.SYNOPSIS FOR CENTRAL BERING SEA...HIGH PRESSURE MOVES OVER THE
CENTRAL AND EASTERN BERING SEA THROUGH SUN NIGHT. A 997 MB LOW AT
55N 164E MOVES TO 58N 173E AND DEEPENS TO 976 MB BY MON MORNING.
THE ASSOCIATED FRONT PUSHES OVER THE ALEUTIANS THROUGH MON
MORNING.


$$

PKZ411-180030-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE-
352 AM AKDT SAT SEP 17 2016

...GALE WARNING TONIGHT AND SUNDAY...

.TODAY...S WIND 15 TO 30 KT. SEAS 6 TO 11 FT. PATCHY FOG. RAIN.
.TONIGHT...S WIND 25 TO 40 KT. SEAS 8 TO 16 FT. PATCHY FOG. RAIN.
.SUN...SW WIND 20 TO 35 KT. SEAS 12 TO 16 FT. PATCHY FOG. RAIN.
.SUN NIGHT...SW WIND 25 TO 40 KT. SEAS 12 TO 20 FT.
.MON...W WIND 20 TO 35 KT. SEAS 11 TO 19 FT.
.TUE THROUGH WED...NW WIND 15 TO 25 KT. SEAS 7 TO 12 FT.

$$

PKZ412-180030-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N-
352 AM AKDT SAT SEP 17 2016

...GALE WARNING SUNDAY...

.TODAY...SW WIND 10 TO 25 KT. SEAS 4 TO 8 FT.
.TONIGHT...S WIND 10 TO 25 KT INCREASING TO 20 TO 30 KT AFTER
MIDNIGHT. SEAS 5 TO 10 FT. PATCHY FOG.
.SUN...S WIND 25 TO 35 KT. SEAS 9 TO 16 FT. PATCHY FOG. RAIN.
.SUN NIGHT...S WIND 20 TO 35 KT. SEAS 13 TO 17 FT.
.MON...SW WIND 15 TO 30 KT. SEAS 11 TO 19 FT.
.TUE THROUGH WED...W WIND 10 TO 25 KT. SEAS 9 TO 14 FT.

$$

PKZ413-180030-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N-
352 AM AKDT SAT SEP 17 2016

...GALE WARNING TONIGHT AND SUNDAY...

.TODAY...SW WIND 20 TO 30 KT. SEAS 6 TO 10 FT. PATCHY FOG.
.TONIGHT...SW WIND 20 TO 35 KT. SEAS 8 TO 13 FT. PATCHY FOG.
.SUN...S WIND 25 TO 35 KT. SEAS 9 TO 17 FT. PATCHY FOG. RAIN.
.SUN NIGHT...SW WIND 20 TO 35 KT. SEAS 9 TO 16 FT.
.MON THROUGH WED...W WIND 15 TO 30 KT. SEAS 9 TO 17 FT.

$$

PKZ414-180030-
BERING SEA OFFSHORE EAST OF 171W-
352 AM AKDT SAT SEP 17 2016

.TODAY...W WIND 20 TO 30 KT. SEAS 7 TO 10 FT.
.TONIGHT...W WIND 15 TO 30 KT BECOMING SW 10 TO 20 KT AFTER
MIDNIGHT. SEAS 5 TO 10 FT.
.SUN...SW WIND 15 TO 30 KT. SEAS 5 TO 10 FT. PATCHY FOG.
.SUN NIGHT...S WIND 25 TO 40 KT. SEAS 9 TO 14 FT.
.MON THROUGH WED...SW WIND 20 TO 35 KT. SEAS 9 TO 14 FT.

$$
171 
FZAK62 PAFC 172323
OFFALU

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
323 PM AKDT SAT SEP 17 2016

OFFSHORE WATERS FORECAST FOR THE BERING SEA

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.

PKZ499-181345-
323 PM AKDT SAT SEP 17 2016
.SYNOPSIS FOR CENTRAL BERING SEA...
HIGH PRESSURE OVER THE CENTRAL BERING SEA MOVES OVER THE ALASKA
PENINSULA AND BRISTOL BAY SUNDAY. A 983 MB LOW AT 55N 165E TONIGHT
MOVES TO 58N 176E AND DEEPENS TO 977 MB BY MONDAY AFTERNOON.

$$

PKZ411-181345-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE-
323 PM AKDT SAT SEP 17 2016

...GALE WARNING THROUGH SUNDAY NIGHT...

.TONIGHT...S WIND 25 TO 40 KT. SEAS 10 TO 16 FT. PATCHY FOG. RAIN
SHOWERS.
.SUN...S WIND 25 TO 40 KT BECOMING SW 20 TO 30 KT IN THE
AFTERNOON. SEAS 13 TO 17 FT. PATCHY FOG. RAIN SHOWERS.
.SUN NIGHT...SW WIND 20 TO 35 KT. SEAS 12 TO 16 FT BUILDING TO 13
TO 20 FT AFTER MIDNIGHT.
.MON...SW WIND 25 TO 40 KT. SEAS 13 TO 20 FT.
.MON NIGHT...W WIND 20 TO 30 KT. SEAS 10 TO 18 FT.
.TUE THROUGH THU...NW WIND 15 TO 30 KT. SEAS 8 TO 13 FT.

$$

PKZ412-181345-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N-
323 PM AKDT SAT SEP 17 2016

...GALE WARNING SUNDAY AND SUNDAY NIGHT...

.TONIGHT...S WIND 15 TO 30 KT. SEAS 5 TO 8 FT BUILDING TO 7 TO 13
FT AFTER MIDNIGHT. PATCHY FOG.
.SUN...S WIND 30 KT BECOMING 25 TO 40 KT IN THE AFTERNOON. SEAS 10
TO 18 FT. PATCHY FOG.
.SUN NIGHT...S WIND 20 TO 35 KT. SEAS 12 TO 17 FT. PATCHY FOG.
RAIN.
.MON...SW WIND 15 TO 30 KT. SEAS 11 TO 15 FT.
.MON NIGHT...SW WIND 20 TO 30 KT. SEAS 11 TO 18 FT.
.TUE THROUGH THU...NW WIND 15 TO 25 KT. SEAS 9 TO 14 FT.

$$

PKZ413-181345-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N-
323 PM AKDT SAT SEP 17 2016

...GALE WARNING SUNDAY AND SUNDAY NIGHT...

.TONIGHT...SW WIND 20 TO 30 KT. SEAS 8 TO 13 FT. PATCHY FOG.
.SUN...S WIND 25 TO 40 KT. SEAS 10 TO 18 FT. PATCHY FOG.
.SUN NIGHT...S WIND 25 TO 40 KT BECOMING SW 10 TO 20 KT AFTER
MIDNIGHT. SEAS 12 TO 17 FT. PATCHY FOG. RAIN.
.MON...SW WIND 20 TO 30 KT. SEAS 9 TO 14 FT.
.MON NIGHT...SW WIND 30 KT. SEAS 10 TO 16 FT.
.TUE THROUGH THU...NW WIND 20 TO 30 KT. SEAS 9 TO 15 FT.

$$

PKZ414-181345-
BERING SEA OFFSHORE EAST OF 171W-
323 PM AKDT SAT SEP 17 2016

...GALE WARNING SUNDAY NIGHT...

.TONIGHT...W WIND 15 TO 30 KT BECOMING SW 10 TO 20 KT AFTER
MIDNIGHT. SEAS 5 TO 11 FT.
.SUN...SW WIND 10 TO 20 KT INCREASING TO 15 TO 30 KT IN THE
AFTERNOON. SEAS 5 TO 10 FT.
.SUN NIGHT...S WIND 25 TO 40 KT. SEAS 10 TO 18 FT. PATCHY FOG.
RAIN.
.MON...S WIND 30 TO 45 KT. SEAS 13 TO 17 FT.
.MON NIGHT...SW WIND 15 TO 25 KT. SEAS 8 TO 13 FT.
.TUE THROUGH WED...SW WIND 10 TO 25 KT. SEAS 7 TO 12 FT.
.THU...NW WIND 10 TO 20 KT. SEAS 6 TO 9 FT.

$$
585 
FZAK62 PAFC 181158
OFFALU

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE ANCHORAGE AK
358 AM AKDT SUN SEP 18 2016

OFFSHORE WATERS FORECAST FOR THE BERING SEA

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.

PKZ499-190045-
358 AM AKDT SUN SEP 18 2016
.SYNOPSIS FOR CENTRAL BERING SEA...A 981 MB LOW AT 56N 165W MOVES
TO 59N 178W AT 978 MB BY TUE MORNING. THE ASSOCIATED FRONTS PUSH
THROUGH THE BERING SEA AND ACROSS ALASKA PENINSULA AND THE WESTERN
AND CENTRAL ALEUTIANS THROUGH TUE MORNING.

$$

PKZ411-190045-
BERING SEA OFFSHORE WEST OF 180 AND EAST OF THE INTERNATIONAL
DATELINE-
358 AM AKDT SUN SEP 18 2016

...GALE WARNING THROUGH MONDAY...

.TODAY...S WIND 25 TO 40 KT. SEAS 12 TO 17 FT. PATCHY FOG. RAIN.
.TONIGHT...SW WIND 20 TO 35 KT. SEAS 12 TO 18 FT. SLIGHT CHANCE OF
THUNDERSTORMS AFTER MIDNIGHT.
.MON...SW WIND 25 TO 40 KT. SEAS 13 TO 19 FT. SLIGHT CHANCE OF
THUNDERSTORMS.
.MON NIGHT...W WIND 20 TO 35 KT. SEAS 11 TO 19 FT. SLIGHT CHANCE
OF THUNDERSTORMS.
.TUE THROUGH THU...NW WIND 15 TO 25 KT. SEAS 8 TO 13 FT.

$$

PKZ412-190045-
BERING SEA OFFSHORE 171W TO 180 AND NORTH OF 56N-
358 AM AKDT SUN SEP 18 2016

...GALE WARNING THROUGH TONIGHT...

.TODAY...S WIND 30 KT BECOMING 25 TO 40 KT IN THE AFTERNOON. SEAS
9 TO 17 FT. PATCHY FOG.
.TONIGHT...S WIND 20 TO 35 KT. SEAS 12 TO 17 FT. PATCHY FOG. RAIN.
.MON...SW WIND 15 TO 30 KT. SEAS 11 TO 16 FT. SLIGHT CHANCE OF
THUNDERSTORMS IN THE AFTERNOON.
.MON NIGHT...SW WIND 25 TO 35 KT. SEAS 12 TO 18 FT. SLIGHT CHANCE
OF THUNDERSTORMS.
.TUE THROUGH THU...NW WIND 15 TO 30 KT. SEAS 8 TO 16 FT.

$$

PKZ413-190045-
BERING SEA OFFSHORE 171W TO 180 AND SOUTH OF 56N-
358 AM AKDT SUN SEP 18 2016

...GALE WARNING THROUGH TONIGHT...

.TODAY...S WIND 25 TO 40 KT. SEAS 9 TO 17 FT. PATCHY FOG. RAIN.
.TONIGHT...SW WIND 25 TO 40 KT. SEAS 10 TO 17 FT. PATCHY FOG.
RAIN.
.MON...SW WIND 20 TO 30 KT. SEAS 10 TO 16 FT. SLIGHT CHANCE OF
THUNDERSTORMS IN THE AFTERNOON.
.MON NIGHT...SW WIND 30 KT. SEAS 11 TO 17 FT. SLIGHT CHANCE OF
THUNDERSTORMS.
.TUE THROUGH THU...NW WIND 15 TO 30 KT. SEAS 9 TO 14 FT.

$$

PKZ414-190045-
BERING SEA OFFSHORE EAST OF 171W-
358 AM AKDT SUN SEP 18 2016

...GALE WARNING TONIGHT AND MONDAY...

.TODAY...SW WIND 15 TO 30 KT. SEAS 5 TO 10 FT. PATCHY FOG.
.TONIGHT...S WIND 25 TO 40 KT. SEAS 9 TO 14 FT. PATCHY FOG.
.MON...SW WIND 30 TO 45 KT. SEAS 11 TO 17 FT. PATCHY FOG. RAIN.
.MON NIGHT...SW WIND 15 TO 25 KT. SEAS 8 TO 13 FT.
.TUE THROUGH WED...W WIND 10 TO 25 KT. SEAS 7 TO 12 FT.
.THU...NW WIND 10 TO 20 KT. SEAS 5 TO 9 FT.

$$

What forecasters said that day

The local office's own words before this gale warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Anchorage, AK wrote its last area forecast discussion before this gale warning went out at Sep 15, 11:28 PM AKDT, 4 hours 30 minutes earlier.

Area forecast discussion, Sep 15, 11:28 PM AKDT, 4 hours 30 minutes before
Southcentral and Southwest Alaska Forecast Discussion...CORRECTED
National Weather Service Anchorage AK
1128 PM AKDT THU SEP 15 2016

.ANALYSIS AND UPPER LEVELS...

A broad, mature low is gradually weakening as it shifts eastward along
the eastern Aleutian Islands this afternoon. Ahead of the low,
southerly onshore flow is bringing a moist airmass inland over
southern Alaska. Instability associated with the colder air moving
in aloft is supporting isolated shower activity over the Cook
Inlet area. On the other side of the Kenai mountains however,
steadier and heavier rain associated with a frontal boundary is
moving inland over the Prince William Sound and eastern Kenai
Peninsula. Over the southwest mainland, a trough moving inland is
pushing a line of showers through the Bristol Bay area over the
Kuskokwim Mountains and towards the Yukon-Kuskokwim Delta. High
pressure edging in to the Bering Sea from eastern Siberia is
increasing the pressure gradient over the Bering, supporting gusty
gale force winds north of the low center.

&&

.MODEL DISCUSSION...

Models are in fairly good synoptic agreement through Friday, then
start to differ in the handling of a polar low that drops down
through southwestern Alaska through Saturday night. The NAM is
slightly faster with the approach of the low than the GFS. A
middle of the road solution was used with a blend of both models.
The main forecast implications of this was an adjustment to the
timing and strength of the gale force winds wrapping around the
back side of the low over the Alaska Peninsula and the surrounding
waters through Saturday night. On a smaller scale, models are
struggling with the handling of the impulses of energy moving
through Southcentral Alaska tomorrow, resulting in some
model discrepancies in the exact placement of showers.

&&

.SHORT TERM FORECAST SOUTHCENTRAL ALASKA (Days 1 and 2)...
As a weakening gale force front will dissipate near Prince
William Sound this evening, winds and rain stretching from the
north Gulf coast into Southcentral will begin to diminish by late
this evening. This will bring only a short lived period of quiet
weather as an upper level trough approaching the western Gulf
will bring a return to the clouds and showers to most of the area
by late tonight. Winds from this system will be notably lighter
than today however as there will only a weak surface low
associated with it. As a result the rainfall rates will be much
less than what was experienced last night as dynamics will be much
weaker. On Saturday, conditions should begin to clear as the upper
level trough axis passes to the east, allowing for a brief period
of shortwave ridging.

&&

.SHORT TERM FORECAST SOUTHWEST ALASKA (Days 1 and 2)...
The broad area of low pressure is located over the Eastern
Aleutians, and continues to track eastward heading into the
weekend. By Friday morning this system becomes elongated, and
will be located over the Alaska Peninsula extending northward
into the Y-K Delta region. This produces a showery weather regime
as weak shortwaves track through the Southwest Alaska region.
Look for the winds to strengthen with cooler air filtering in
from the north producing gusty northwesterly winds along the
Kuskokwim/Bristol Bay heading into Friday afternoon.

&&

.SHORT TERM FORECAST BERING SEA/ALEUTIANS (Days 1 and 2)...
The Bering will be dominated by gusty northerly winds as the
986 mb surface low located just east of Unalaska as it continues
to track eastward this evening. Meanwhile, look for the winds
shifting more northwesterly through majority of the Bering, and
the Aleutians. This synoptic feature will produce gusty gale
force gap winds through the Eastern Aleutians by early Friday
evening through Saturday morning time-frame. This pattern will
produce a showery weather regime through the next several days.
As the low tracks eastward along the eastern Bering/Aleutians,
look for cooler temperatures to create an unstable environment.
This will enhance the chances for possible thunderstorms over the
aforementioned region tonight.

&&

.LONG TERM FORECAST (Days 3 through 7)...

Beginning the long term period on Saturday evening, the flow will
becoming more progressive as a split trough across Alaska gives
way to a progressive shortwave ridge over the eastern Bering Sea.
The main trough of interest will be a digging shortwave trough
centered over Kodiak Island. This trough will be quickly moving
into the southeast Gulf of Alaska Saturday night and Sunday,
allowing for the Bering ridge axis to slide east by Sunday
evening. This will allow for drying and partly clearing skies as
another large trough across the far western Bering Sea tracks a
rather impressive warm front toward the Bering Strait.

This is the point in the extended forecast where things get rather
interesting. Both the GFS and ECMWF deterministic and ensembles
are depicting a rather impressive amplification of the northeast
Pacific ridge Monday and into the late portions of the week. In
conjunction with this will be a series of very low amplitude
tropical/subtropical low level diabatic anomalies progressing east
along the Pacific jet stream which will be pushing 150+ knots by
midweek. Standardized anomalies in some model runs are pushing 2-3
sigmas with respect to precipitable waters whereas the GFS
ensemble mean depicts 30-50% chance of PW values pushing +1 sigma.
The combination of impressive baroclinic dynamics, strong
polar/subtropical jet streams, and high latent energy in the form
of moisture condensation *may* set the stage for a very active
pattern for southern Alaska Tuesday through Thursday. What is
known is a moderate gale force front will quickly move across the
Bering into southwest Alaska by Monday night, but what is less
known is what happens with that front by midweek. The details are
subtle but important, but it should be noted that the amount if
energy available means the potential exists for strong lows to
impact southern Alaska, and there is such high moisture values
that coastal flooding is also a possibility. Once again, there is
much uncertainty with the details, but the large scale pattern is
becoming more favorable for the potential for significant weather
by midweek.

&&

.AFC WATCHES/WARNINGS/ADVISORIES...
PUBLIC...None.
MARINE...None.

&&

SYNOPSIS AND MODEL DISCUSSION...RD
SOUTHCENTRAL ALASKA...DEK
SOUTHWEST ALASKA/BERING SEA/ALEUTIANS...PD
LONG TERM...JA

The office that day

Everything else NWS Anchorage, AK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 16, 4:07 AM AKDTGale WarningAFC4 days
Sep 16, 2:59 PM AKDTGale WarningAFC50 hr
Sep 16, 3:24 PM AKDTSmall Craft AdvisoryAFC60 hr
Sep 16, 3:38 PM AKDTGale WarningAFC4 days

Nearby

Gale Warnings in Alaska, 2016Every gale warning in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.