Gale Warning 486, NWS Anchorage, AK

131 
FZAK62 PAFC 211143
OFFALU

Offshore Waters Forecast
National Weather Service Anchorage AK
343 AM AKDT Fri Sep 21 2018

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.

PKZ499-220130-
343 AM AKDT Fri Sep 21 2018
.SYNOPSIS FOR CENTRAL BERING SEA...

A 989 low at 59N 177W moves to 61N 169W at 983 mb by Sat morning
and then moves inland near 62N 164W at 986 mb by Sat afternoon.

$$

PKZ411-220130-
Bering Sea Offshore West of 180 and East of the International
Dateline-
343 AM AKDT Fri Sep 21 2018

.TODAY...W wind 15 to 25 kt. Seas 6 to 10 ft.
.TONIGHT...W wind 10 to 20 kt. Seas 5 to 8 ft.
.SAT...W wind 10 to 15 kt. Seas 6 ft.
.SAT NIGHT...NW wind 15 kt. Seas 6 ft.
.SUN...NW wind up to 15 kt. Seas 5 ft.
.MON...W wind 10 kt. Seas 4 ft.
.TUE...S wind 10 to 20 kt. Seas 4 ft.

$$

PKZ412-220130-
Bering Sea Offshore 171W to 180 and North of 56N-
343 AM AKDT Fri Sep 21 2018

...GALE WARNING THROUGH TONIGHT...

.TODAY...W wind 20 to 35 kt. Seas 12 to 17 ft.
.TONIGHT...W wind 25 to 40 kt. Seas 14 to 21 ft.
.SAT...W wind 15 to 30 kt. Seas 8 to 15 ft.
.SAT NIGHT...W wind 10 to 25 kt. Seas 6 to 9 ft.
.SUN THROUGH MON...NW wind up to 20 kt. Seas 4 to 7 ft.
.TUE...S wind up to 10 kt. Seas 3 ft.

$$

PKZ413-220130-
Bering Sea Offshore 171W to 180 and South of 56N-
343 AM AKDT Fri Sep 21 2018

.TODAY...W wind 20 to 30 kt. Seas 9 to 14 ft.
.TONIGHT...W wind 15 to 30 kt. Seas 8 to 14 ft.
.SAT...W wind 10 to 25 kt. Seas 6 to 12 ft.
.SAT NIGHT...W wind 10 to 20 kt. Seas 5 to 8 ft.
.SUN THROUGH MON...NW wind 15 kt. Seas 5 ft.
.TUE...SE wind up to 15 kt. Seas 3 ft.

$$

PKZ414-220130-
Bering Sea Offshore East of 171W-
343 AM AKDT Fri Sep 21 2018

...GALE WARNING TONIGHT AND SATURDAY...

.TODAY...SW wind 20 to 30 kt. Seas 10 to 14 ft. Patchy fog.
.TONIGHT...SW wind 25 to 40 kt. Seas 10 to 17 ft.
.SAT...SW wind 20 to 35 kt. Seas 10 to 16 ft.
.SAT NIGHT...SW wind 15 to 30 kt. Seas 7 to 12 ft.
.SUN THROUGH MON...W wind up to 20 kt. Seas 4 to 9 ft.
.TUE...N wind up to 15 kt. Seas 3 ft.

$$

968 
FZAK62 PAFC 212343
OFFALU

Offshore Waters Forecast
National Weather Service Anchorage AK
343 PM AKDT Fri Sep 21 2018

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.

PKZ499-221330-
343 PM AKDT Fri Sep 21 2018
.SYNOPSIS FOR CENTRAL BERING SEA...

A 979 mb low at 59N 174W moves over Hooper Bay Sat afternoon at
983 mb. The low then drifts north to Norton Sound Sun afternoon 
at 996 mb.

$$

PKZ411-221330-
Bering Sea Offshore West of 180 and East of the International
Dateline-
343 PM AKDT Fri Sep 21 2018

.TONIGHT...W wind 10 to 20 kt. Seas 5 to 9 ft. Patchy fog.
.SAT...W wind 10 to 15 kt. Seas 5 to 8 ft.
.SAT NIGHT...NW wind 15 kt. Seas 6 ft.
.SUN...NW wind 15 kt. Seas 6 ft.
.SUN NIGHT...NW wind up to 15 kt. Seas 5 ft.
.MON...W wind up to 15 kt. Seas 3 to 6 ft.
.TUE THROUGH WED...SE wind 10 to 20 kt. Seas 3 to 8 ft.

$$

PKZ412-221330-
Bering Sea Offshore 171W to 180 and North of 56N-
343 PM AKDT Fri Sep 21 2018

...GALE WARNING TONIGHT...

.TONIGHT...W wind 30 to 45 kt. Seas 11 to 19 ft. Patchy fog. Rain.
.SAT...W wind 15 to 30 kt. Seas 9 to 14 ft. Patchy fog.
.SAT NIGHT...NW wind 10 to 25 kt. Seas 8 ft.
.SUN...NW wind 15 kt. Seas 4 to 7 ft.
.SUN NIGHT...NW wind 15 kt. Seas 5 ft.
.MON...NW wind up to 20 kt. Seas 5 ft.
.TUE...S wind up to 10 kt. Seas 3 ft.
.WED...SE wind 10 to 20 kt. Seas 4 to 9 ft.

$$

PKZ413-221330-
Bering Sea Offshore 171W to 180 and South of 56N-
343 PM AKDT Fri Sep 21 2018

.TONIGHT...W wind 15 to 30 kt. Seas 6 to 11 ft. Patchy fog.
.SAT...W wind 15 to 25 kt. Seas 7 to 11 ft. Patchy fog.
.SAT NIGHT...W wind 10 to 20 kt. Seas 7 ft.
.SUN...W wind 15 kt. Seas 4 to 7 ft.
.SUN NIGHT...NW wind 15 kt. Seas 5 ft.
.MON...NW wind up to 15 kt. Seas 5 ft.
.TUE THROUGH WED...SE wind up to 20 kt. Seas 3 to 8 ft.

$$

PKZ414-221330-
Bering Sea Offshore East of 171W-
343 PM AKDT Fri Sep 21 2018

...GALE WARNING THROUGH SATURDAY...

.TONIGHT...SW wind 25 to 40 kt. Seas 11 to 19 ft. Patchy fog.
.SAT...SW wind 20 to 35 kt. Seas 10 to 18 ft. Patchy fog.
.SAT NIGHT...SW wind 15 to 30 kt. Seas 7 to 12 ft.
.SUN...SW wind 10 to 20 kt. Seas 5 to 9 ft.
.SUN NIGHT...W wind 10 to 20 kt. Seas 5 ft.
.MON...W wind up to 15 kt. Seas 4 ft.
.TUE...N wind up to 15 kt. Seas 3 ft.
.WED...NE wind 15 kt. Seas 0 to 4 ft.

$$

758 
FZAK62 PAFC 221230
OFFALU

Offshore Waters Forecast
National Weather Service Anchorage AK
430 AM AKDT Sat Sep 22 2018

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.

PKZ499-230115-
430 AM AKDT Sat Sep 22 2018
.SYNOPSIS FOR CENTRAL BERING SEA...
A 981 mb low at 60N 170W will move inland near 62N 165W at 985 mb
by Sun morning and then drifts north to Norton Sound by Mon 
morning.

$$

PKZ411-230115-
Bering Sea Offshore West of 180 and East of the International
Dateline-
430 AM AKDT Sat Sep 22 2018

.TODAY...W wind 10 to 15 kt. Seas 6 ft.
.TONIGHT...NW wind 15 kt. Seas 6 ft.
.SUN...NW wind 15 kt. Seas 6 ft.
.SUN NIGHT...NW wind 15 kt. Seas 5 ft.
.MON...W wind up to 15 kt. Seas 4 ft.
.TUE...S wind up to 20 kt. Seas 4 ft.
.WED...SE wind 10 to 20 kt. Seas 3 to 8 ft.

$$

PKZ412-230115-
Bering Sea Offshore 171W to 180 and North of 56N-
430 AM AKDT Sat Sep 22 2018

.TODAY...W wind 15 to 30 kt. Seas 9 to 14 ft. Patchy fog. Rain.
.TONIGHT...NW wind 10 to 25 kt. Seas 7 to 10 ft.
.SUN...NW wind 15 kt. Seas 6 ft.
.SUN NIGHT...NW wind 15 kt. Seas 5 ft.
.MON...NW wind up to 15 kt. Seas 5 ft.
.TUE...SW wind up to 10 kt. Seas 3 ft.
.WED...SE wind 10 to 20 kt. Seas 4 to 9 ft.

$$

PKZ413-230115-
Bering Sea Offshore 171W to 180 and South of 56N-
430 AM AKDT Sat Sep 22 2018

.TODAY...W wind 10 to 20 kt. Seas 6 to 10 ft. Patchy fog.
.TONIGHT...W wind 10 to 20 kt. Seas 5 to 8 ft.
.SUN...W wind 15 kt. Seas 6 ft.
.SUN NIGHT...NW wind 15 kt. Seas 5 ft.
.MON...NW wind up to 15 kt. Seas 4 ft.
.TUE THROUGH WED...SE wind up to 20 kt. Seas 3 to 8 ft.

$$

PKZ414-230115-
Bering Sea Offshore East of 171W-
430 AM AKDT Sat Sep 22 2018

...GALE WARNING TODAY...

.TODAY...W wind 25 to 40 kt. Seas 10 to 18 ft. Patchy fog.
.TONIGHT...SW wind 15 to 30 kt. Seas 8 to 13 ft.
.SUN...SW wind 10 to 20 kt. Seas 6 to 9 ft.
.SUN NIGHT...W wind 10 to 20 kt. Seas 5 ft.
.MON...W wind up to 20 kt. Seas 4 ft.
.TUE...N wind up to 15 kt. Seas 3 ft.
.WED...NE wind 15 kt. Seas 0 to 4 ft.

$$

Southcentral and Southwest Alaska Forecast Discussion
National Weather Service Anchorage AK
405 AM AKDT Thu Sep 20 2018

.ANALYSIS AND UPPER LEVELS...
A persistent and slow moving closed upper level low is now
centered over the North Slope this morning with a series of very
low amplitude shortwave troughs undercutting the low. Clouds and
rain associated with this pattern are moving into Southwest Alaska
in association with weak warm air advection. Over the Bering Sea,
transient shortwave ridging is moving eastward ahead of a
substantial subtropical warm front (gale force) which is moving
into the southwest Bering Sea. Over Southcentral, the pressure
gradient and upper flow are weak, but plenty of low and mid level
stratus/altostratus inhabit the region.

&&

.MODEL DISCUSSION...
The numerical weather models are now in very good agreement and
are quite stable for the past couple iterations with respect to a
strong gale force low moving into the Bering Sea and a closed low
over the North Slope. Both features will have an increasing impact
on the sensible weather across all of Southern Alaska headed into
the late week. Model consensus remains great through 72 hours
until things begin to fall apart with a series of lows tracking
into the Gulf of Alaska as the general trough pattern shifts east.

For this forecast, the GFS was favored for the strong gale force
low in the Bering with the NAM over Southcentral.

&&

.AVIATION...
PANC...MVFR CIGS this morning will last through late morning
before afternoon heating helps lift CIGS to VFR. Extensive high
clouds is expected to keep any fog at bay this morning. CIGS are
expected to drop below 5000 feet again tonight.

&&

.SHORT TERM FORECAST SOUTHCENTRAL ALASKA (Days 1 and 2)...
The upper level low over northern Alaska will slowly move
northeastward through Friday afternoon as westerly flow continues
over southern Alaska. Considerable clouds will remain over the
area, but showers will be minimal, and mainly confined to the
Susitna and Copper River valleys. On Friday afternoon a fairly
vigorous low in the Bering will send a front into Southcentral
from the west. This will switch the flow aloft to southwest Friday
night. This direction is favorable to give measurable rain to
much of Southcentral. Conditions will also get a bit breezy
through Turnagain Arm and the Copper River basin as the surface
gradient increases due to the low in the Bering and a triple point
low developing near Kodiak Island.

&&

.SHORT TERM FORECAST SOUTHWEST ALASKA (through Saturday)...
Low pressure across the northwest moves a weak front across the
Southwest today spreading rain showers from west to east. The next
organized front moves to the coast tonight, with gusty southerly
winds and rain spreading inland through Friday. The surface low
driving the front nears Nunivak Island early Saturday morning,
keeping ongoing rain through Saturday night. Gusty conditions
taper down for much of the Southwest on Saturday, however gusts
continue for the coastal locations as the low center lifts north
of the Kuskokwim Delta late day. The winds shift to the south to
southwest as the low moves just north, which will bring higher
waves to the coast and thus, the threat for coastal erosion.

&&

.SHORT TERM FORECAST BERING SEA/ALEUTIANS (Days 1 and 2)...
Winds are expected to increase rapidly this morning across the
Central Aleutians as the next North Pacific low nears approaches
Bering. This front spreads moderate to heavy rain across the
Bering along with max gale winds. The associated surface low is
expected to cross over near Kiska this morning, then continues to
deepen on a northward track to the northern waters late tonight. A
cold air mass pulls around the backside of this occluded system
later on Friday increasing westerly flow across the central and
eastern waters through Saturday.

&&

.LONG TERM FORECAST (Days 4 through 7/Saturday night through
Wednesday night)...
At the start of the extended period (Saturday night) a mature low
will be sitting along the west coast of Alaska, with widespread
rain across Southwest Alaska and areas of rain lingering over
Southcentral. Expect slow improvement Sunday through Sunday night
as this system weakens and lifts northward.

Beyond that (for the first half of next week - and beyond) the
latest model guidance (including ensembles) is all over the place
with details of specific storm systems. Thus, forecast confidence
is about as low as it gets in the ability to say what might
happen on any specific day. However, there is quite a bit of
agreement in the overall large scale pattern, with a long-wave
trough over the Bering Sea/Aleutians occasionally extending right
across mainland Alaska and a ridge centered over the northeast
Pacific/western North America. Key differences are in the
interface between the trough and ridge (in vicinity of the Gulf
of Alaska on up to Southcentral Alaska). The overall amplified
pattern supports development of deep surface lows with a general
storm track from the North Pacific northward toward mainland
Alaska, with additional storms moving through the trough out
in the Bering Sea/Aleutians. In this type of pattern would
generally expect wet conditions across most of Alaska.

&&

.AFC WATCHES/WARNINGS/ADVISORIES...
PUBLIC...None.
MARINE...Gale Warning 155 165 170 172>177 179.

&&

SYNOPSIS AND MODEL DISCUSSION...JA
SOUTHCENTRAL ALASKA...BL
SOUTHWEST ALASKA/BERING SEA/ALEUTIANS...KH
LONG TERM...SEB

SPECIAL WEATHER STATEMENT
National Weather Service ANCHORAGE AK
1058 AM AKDT Thu Sep 20 2018

AKZ121-221900-
Western Kenai Peninsula-
Including the cities of Kenai, Soldotna, Homer,
and Cooper Landing
1058 AM AKDT Thu Sep 20 2018

...Skilak Glacier Dammed Lake is Releasing...

Residents along the Kenai River downstream of Skilak Lake should be
aware of rising water through Friday. The Skilak Glacial Lake
started releasing on September 14, and is forecast to crest on
Friday morning at bankfull levels (action stage), slightly faster
than initially expected. Water levels on the Kenai River
downstream of Skilak Lake are expected to rise an additional foot
from current levels by Friday morning. Waters are then expected to
fall below bankfull on Saturday morning after the release is
completed.

The previous release of the lake occurred October 2016. Comparing
aerial reconnaissance of the Skilak Glacier Lake on August 25,
2018 to aerial reconnaissance before the 2016 release shows that
the lake volumes of both releases are similar.