Alaska, 2016

High Wind in Alaska, November 26, 2016

November 26, 2016 · NWS AFC · 2 events in 2 counties and zones

A strong low pressure system developed just south of the Aleutian chain and brought a frontal system through the Eastern Aleutians and the Alaska Peninsula. Westerly winds behind the front were enhanced by terrain.

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
2

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS AFC wrote it up.

A strong low pressure system developed just south of the Aleutian chain and brought a frontal system through the Eastern Aleutians and the Alaska Peninsula. Westerly winds behind the front were enhanced by terrain.

What forecasters said that day

The local office's own words before the first event, 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 the first event at Nov 26, 4:19 AM AKST, 1 hour 37 minutes earlier.

Area forecast discussion, Nov 26, 4:19 AM AKST, 1 hour 37 minutes before
Southcentral and Southwest Alaska Forecast Discussion
National Weather Service Anchorage AK
419 AM AKST Sat Nov 26 2016

.ANALYSIS AND UPPER LEVELS...

Infrared and water vapor satellite imagery depicts a strong
cyclone currently at or near peak intensity about 100 miles
southwest of the Pribilof Islands. An overnight ASCAT pass on
winds depicts a broad area of storm-force winds extending from
near the Central Aleutians well south into the North Pacific to
near 49N latitude. A strong jet streak (estimated 125kt or more
from 500 mb on up) and strong low level baroclinicity and
convergence support high winds and moderate to heavy
precipitation, particularly along the southern periphery of the
low. Also of note, a very strong potential vorticity anomaly is
evident in water vapor imagery (very dry air) just south of the
low center and its associated front. This impressive anomaly has
persisted through the evening and overnight hours. This is
favorable for thunderstorms as it moves over top of low level warm
and moist air.

There has been some change in the track of the low overnight, and
this has resulted in some impacts on our warnings. With a more
southern track to this low closer to the Alaska Peninsula, the
Blizzard Warning was cancelled last evening for the area around
Kuskokwim Bay, as snow appears to be setting up just to the south.
However, this southern track does not seem to change the expected
impacts due to high winds across the Eastern Aleutians and Alaska
Peninsula today.

Looking downstream, a high amplitude trough is continuing to dig
southeast across the far northern and eastern Gulf of Alaska.
Along the northern extent of this trough, snow is falling across
eastern Prince William Sound extending north into the Copper River
Basin. The only other feature of note is that the mid and upper
levels have dried out over southern Alaska out ahead of the
aforementioned Bering cyclone, aiding in the development of
stratus and fog over inland areas, which will become less and less
of a problem through today as moisture increases in the middle and
upper levels.

&&

.MODEL DISCUSSION...

As mentioned above, 00z models all shifted south with the low
track from the southern Bering to the far southern Bristol Bay
today and then as it moves into the Western Gulf of Alaska
tonight. This has resulted in mainly a lowering of overall snow
amounts (and associated blowing snow) over much of inland
Southwest and Southcentral Alaska over the next couple of days.
This includes the Anchorage area, where there no longer appears to
be a significant up-inlet cold advection push that would be needed
to support the heavier accumulations of snow that had been
expected yesterday.

&&

.AVIATION...
PANC...Models are depicting a low-VFR ceiling through the morning,
but it is not out of the question for some fog to develop as well.
Have decided for now to keep the VCFG and keep the low-VFR
ceilings until 20z, with rising ceilings thereafter as mid- and
high-level clouds and low-level winds begin to increase as the
next storm system approaches.

&&

.SHORT TERM FORECAST SOUTHCENTRAL ALASKA (Days 1 and 2)...
Light snow will diminish across the Copper River Basin as an
upper trough moves east across the area. Gap/outflow winds across
the eastern Kenai Pen and North Gulf Coast will diminish this
morning as pressure gradients weaken. An upper 960s low moves from
the Bering Sea to over Kodiak Island this evening then slowly
weakens over the northern Gulf through Sunday. The associated
occluded front moves to near Kodiak Island this morning then
heads toward the northern Gulf as it stretches east. Rain will
spread to Kodiak with the front this morning then head toward the
Gulf Coast this afternoon. Precipitation along the coasts should
trend toward a mix with inland areas holding generally as snow.
The brunt of the precipitation should remain along the coasts and
eastern Kenai Pen with only some light snow making it inland
across the MATSU valleys and Anchorage Bowl today. Snow has a
better shot across the MATSU valleys and Anchorage Bowl on late
Sunday as a upper trough moves in from the west.

Gales are expected with the front across the Gulf waters today
with a band of storms on the backside across the Southern Gulf.
Coastal marine areas south see some relief from the Gales on
Sunday, however Gulf waters will still see some potential for
westerly gales. Outflow conditions across the eastern Kenai Pen is
expected to develop early Sunday and continue through Sunday
night.

&&

.SHORT TERM FORECAST SOUTHWEST ALASKA...
The low in the southern Bering that is tracking east will push its
front over southwest Alaska this morning. It will start off
bringing snow to the area accompanied by strong winds. These
conditions will cause blowing snow for areas north and west of
King Salmon that will bring blizzard conditions to the area. As
the low pushes into the Gulf this evening both the snow and winds
will diminish.

With the southerly position of the low, other areas of southwest
Alaska will see little snow accumulation but they will see strong
northerly winds into tonight. Sunday into Monday will see calmer
conditions for southwest Alaska with little in terms of new
precipitation.

&&

.SHORT TERM FORECAST BERING SEA/ALEUTIANS...
The low tracking across the southern Bering is bringing strong
winds with it to the Aleutians aided in part by strong cold air
advection. Areas of the Eastern Aleutians and Alaska Peninsula
will see warning level winds that will increase from west to east
throughout today. As the low moves off into the Gulf this evening
the winds will weaken. The remainder of the weekend will be
characterized by showers and and primarily westerly winds. Then on
Monday a new front will push in over the Western Aleutians
bringing rain, snow, and stronger winds to the islands.

&&

.LONG TERM FORECAST (Days 3 through 7)...
Models have trended south with the low crossing the Gulf of Alaska
on Sunday but all still develop the remnant low over Prince
William Sound Sunday evening after the main low tracks into the
eastern Gulf then inland across Southeast Alaska. The combination
the presence of this Prince William Sound surface low and the cold
air advection from the upper trough over southwest Alaska pushing
into southcentral Alaska increases confidence in the potential for
a snow event over southcentral Alaska Sunday night. Current expected
QPF amounts combined with a favorable snow growth temperature and
moisture profile have the potential to bring around 4 to 6 inches
of snow to the Anchorage Bowl and Hillside as well as the Matanuska
Valley from Sunday evening through Monday morning. The snow will
shift east over the Copper River Basin with several inches
possible there through the day Monday as the low also shifts east.

Out west, a surface low over the Bering Sunday night will weaken
as it tracks east toward Bristol Bay Monday then dissipate as it
crosses the Alaska Peninsula Monday Night. A stronger incoming
frontal system will lift from the North Pacific up over the
Aleutians Monday Night. The parent low will track from west to
east just south of the Aleutians Tuesday and Wednesday as the
front progresses across the Bering. South of the Gulf, another
low will rapidly spin up Monday and Tuesday as it tracks toward
the eastern Gulf and then swings inland across the Southeast
Alaska Panhandle Tuesday Night. For Southcentral Alaska the
biggest impacts of this system will be to substantially increase
cold northwesterly outflow gap winds Tuesday and Tuesday night.

For the second half of the week, a cold air mass will persist
over much of mainland Alaska supported by continued upper level
troughing and periodically being reinforced by arctic troughs
swinging in from the northwest. A series of frontal systems
tracking in from the west across the Aleutians and southern Bering
as well as frontal systems lifting up through the Gulf will
additional chances for snow to the area through the end of the
week.

&&

.AFC WATCHES/WARNINGS/ADVISORIES...
PUBLIC...High Wind Warning 181 185. Blizzard Warning 161. Blowing
Snow Advisory 125.
MARINE...Hurricane 155 170 172. Storm 130 132 150 165 171 173 174
175 176 352. Gales 119 120 131 138 160 177 178 179 180 351 413
414.

&&

SYNOPSIS AND MODEL DISCUSSION...CC
SOUTHCENTRAL ALASKA...RMC
SOUTHWEST ALASKA/BERING SEA/ALEUTIANS...DK
LONG TERM...JR

Event by event

2 high wind. Local standard time, as filed.

High Wind, Eastern Aleutians

When
November 26, 5:56 AM AKST to 12:56 PM AKST
Where
Eastern Aleutians forecast zone
Measured
85 kt (98 mph) measured gust
Reported by
ASOS

Dutch Harbor ASOS recorded a peak wind of 85 knots at 12:49. Over 6 consecutive hours of winds above 73 mph were recorded.

High Wind, Alaska Peninsula

When
November 26, 11:53 AM AKST to 5:56 PM AKST
Where
Alaska Peninsula forecast zone
Measured
66 kt (76 mph) measured gust
Reported by
ASOS

King Cove ASOS recorded a gust of 66 knots at 5 p.m.

What these are

High Wind
Sustained non-thunderstorm winds of 40 mph or more for an hour, or gusts of 58 mph or more.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Alaska in 2016Every state in 2016This day in weather historyWarnings in Alaska, November 2016

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 667223, 667221.