Alert archive / Alaska / Small Craft Advisories in 2021

Small Craft Advisory 221, NWS Juneau, AK

April 11, 2021

NWS Juneau, AK issued this small craft advisory at Apr 11, 2021, 3:37 PM AKDT. It was in force for 4 days.

The area

The counties it named.

The facts

Issued
Apr 11, 2021, 3:37 PM AKDT (23:37 UTC)
Expired
Apr 15, 2021, 3:48 AM AKDT
In force
4 days
Issued by
NWS Juneau, AK

The text

As transmitted.

812 
FZAK53 PAJK 112337
CWFYAK

Marine Forecast for Yakutat Bay
National Weather Service Juneau AK
337 PM AKDT Sun Apr 11 2021

Coastal Waters Forecast for Yakutat Bay

Wind forecasts reflect the predominant speed and direction
expected. Sea forecasts represent the average of the highest
one-third of the combined windwave and swell height.

PKZ053-121745-
Yakutat Bay-
337 PM AKDT Sun Apr 11 2021

...SMALL CRAFT ADVISORY MONDAY...

.TONIGHT...NE wind 15 kt. Seas 6 ft. Snow, then snow and rain late
in the evening.
.MON...NE wind 20 kt. Gusts to 35 kt. Seas 11 ft. Rain and
snow. 
.MON NIGHT...NE wind 20 kt. Gusts to 35 kt. Seas 11 ft. Rain.
.TUE...NE wind 15 kt. Seas 9 ft. Rain.
.TUE NIGHT...NE wind 15 kt. Seas 8 ft. Rain.
.WED...E wind 15 kt. Seas 9 ft. 
.THU...Light winds. Seas 7 ft. 
.FRI...Light winds becoming E 10 kt. Seas 5 ft. 

$$
7 follow-up statements
922 
FZAK53 PAJK 121134
CWFYAK

Marine Forecast for Yakutat Bay
National Weather Service Juneau AK
334 AM AKDT Mon Apr 12 2021

Coastal Waters Forecast for Yakutat Bay

Wind forecasts reflect the predominant speed and direction
expected. Sea forecasts represent the average of the highest
one-third of the combined windwave and swell height.

PKZ053-130545-
Yakutat Bay-
334 AM AKDT Mon Apr 12 2021

...SMALL CRAFT ADVISORY THROUGH LATE TONIGHT...

.TODAY...E wind 20 kt. Seas 10 ft. Rain and snow. 
.TONIGHT...E wind 20 kt. Gusts to 35 kt in the evening. Seas
11 ft. Rain.
.TUE...E wind 15 kt. Seas 9 ft. Rain.
.TUE NIGHT...E wind 25 kt. Seas 12 ft. Rain.
.WED...SE wind 20 kt becoming light. Seas 11 ft. 
.THU...Light winds. Seas 7 ft. 
.FRI...Light winds. Seas 6 ft. 

$$
830 
FZAK53 PAJK 122320
CWFYAK

Marine Forecast for Yakutat Bay
National Weather Service Juneau AK
320 PM AKDT Mon Apr 12 2021

Coastal Waters Forecast for Yakutat Bay

Wind forecasts reflect the predominant speed and direction
expected. Sea forecasts represent the average of the highest
one-third of the combined windwave and swell height.

PKZ053-131730-
Yakutat Bay-
320 PM AKDT Mon Apr 12 2021

...SMALL CRAFT ADVISORY THROUGH TUESDAY...

.TONIGHT...E wind 20 kt. Gusts to 35 kt in the evening. Seas
11 ft. Snow early in the evening. Rain.
.TUE...E wind 15 kt. Seas 8 ft. Rain.
.TUE NIGHT...E wind 20 kt increasing to 30 kt late. Seas
10 ft building to 15 ft late. Rain.
.WED...E wind 25 kt. Gusts to 40 kt. Seas 15 ft. SW swell.
Rain.
.WED NIGHT...E wind 10 kt. Seas 12 ft. SW swell. 
.THU...NE wind 10 kt becoming light. Seas 8 ft. 
.FRI...Light winds. Seas 6 ft. 
.SAT...NE wind 10 kt. Seas 4 ft. 

$$
292 
FZAK53 PAJK 131053
CWFYAK

Marine Forecast for Yakutat Bay
National Weather Service Juneau AK
253 AM AKDT Tue Apr 13 2021

Coastal Waters Forecast for Yakutat Bay

Wind forecasts reflect the predominant speed and direction
expected. Sea forecasts represent the average of the highest
one-third of the combined windwave and swell height.

PKZ053-140500-
Yakutat Bay-
253 AM AKDT Tue Apr 13 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...E wind 15 kt. Seas 8 ft. Rain early in the morning. 
.TONIGHT...E wind 20 kt increasing to 30 kt late. Seas 9 ft
building to 15 ft late. SW swell in the evening. Rain.
.WED...E wind 25 kt diminishing to 10 kt in the afternoon.
Gusts to 40 kt in the morning. Seas 14 ft. SW swell. Rain in the
morning. 
.WED NIGHT...NE wind 10 kt. Seas 11 ft. SW swell. 
.THU...Light winds. Seas 8 ft subsiding to 5 ft. 
.FRI...Light winds. Seas 5 ft. 
.SAT...Light winds. Seas 3 ft. 

$$
561 
FZAK53 PAJK 132333
CWFYAK

Marine Forecast for Yakutat Bay
National Weather Service Juneau AK
333 PM AKDT Tue Apr 13 2021

Coastal Waters Forecast for Yakutat Bay

Wind forecasts reflect the predominant speed and direction
expected. Sea forecasts represent the average of the highest
one-third of the combined windwave and swell height.

PKZ053-141745-
Yakutat Bay-
333 PM AKDT Tue Apr 13 2021

...SMALL CRAFT ADVISORY THROUGH WEDNESDAY...

.TONIGHT...E wind 20 kt increasing to 30 kt late. Seas 9 ft 
building to 15 ft late. Rain.
.WED...E wind 25 kt diminishing to 10 kt in the afternoon.
Gusts to 40 kt in the morning. Seas 16 ft subsiding to 12 ft in
the afternoon. SW swell. Rain in the morning. 
.WED NIGHT...E wind 10 kt. Seas 9 ft. 
.THU...Light winds. Seas 7 ft. SW swell. 
.THU NIGHT...Light winds. Seas 5 ft. 
.FRI...Light winds. Seas 5 ft. 
.SAT...Light winds. Seas 3 ft. 
.SUN...NE wind 10 kt. Seas 3 ft. 

$$
922 
FZAK53 PAJK 141126
CWFYAK

Marine Forecast for Yakutat Bay
National Weather Service Juneau AK
326 AM AKDT Wed Apr 14 2021

Coastal Waters Forecast for Yakutat Bay

Wind forecasts reflect the predominant speed and direction
expected. Sea forecasts represent the average of the highest
one-third of the combined windwave and swell height.

PKZ053-150530-
Yakutat Bay-
326 AM AKDT Wed Apr 14 2021

...SMALL CRAFT ADVISORY THROUGH TONIGHT...

.TODAY...NE wind 20 kt diminishing to 10 kt in the afternoon. 
Gusts to 35 kt early in the morning. Seas 15 ft. Rain.
.TONIGHT...NE wind 10 kt. Seas 10 ft. Rain in the evening. 
.THU...NE wind 15 kt in the morning becoming light. Seas
6 ft. 
.THU NIGHT...NE wind 10 kt. Seas 5 ft. 
.FRI...N wind 15 kt. Seas 5 ft. 
.SAT...N wind 15 kt becoming E. Seas 4 ft. 
.SUN...NE wind 15 kt. Seas 4 ft. 

$$
150 
FZAK53 PAJK 142331
CWFYAK

Marine Forecast for Yakutat Bay
National Weather Service Juneau AK
331 PM AKDT Wed Apr 14 2021

Coastal Waters Forecast for Yakutat Bay

Wind forecasts reflect the predominant speed and direction
expected. Sea forecasts represent the average of the highest
one-third of the combined windwave and swell height.

PKZ053-151745-
Yakutat Bay-
331 PM AKDT Wed Apr 14 2021

...SMALL CRAFT ADVISORY THROUGH LATE TONIGHT...

.TONIGHT...E wind 10 kt. Seas 10 ft. S swell in the evening. Rain
in the evening. 
.THU...NE wind 10 kt in the morning becoming light. Seas
7 ft. 
.THU NIGHT...Light winds. Seas 5 ft. 
.FRI...N wind 10 kt. Seas 4 ft. 
.FRI NIGHT...N wind 10 kt. Seas 4 ft. 
.SAT...N wind 15 kt becoming E. Seas 4 ft. 
.SUN...NE wind 15 kt. Seas 4 ft. 
.MON...E wind 15 kt becoming light. Seas 3 ft. 

$$
653 
FZAK53 PAJK 151148
CWFYAK

Marine Forecast for Yakutat Bay
National Weather Service Juneau AK
348 AM AKDT Thu Apr 15 2021

Coastal Waters Forecast for Yakutat Bay

Wind forecasts reflect the predominant speed and direction
expected. Sea forecasts represent the average of the highest
one-third of the combined windwave and swell height.

PKZ053-160600-
Yakutat Bay-
348 AM AKDT Thu Apr 15 2021

.TODAY...NE wind 10 kt. Seas 7 ft. 
.TONIGHT...Light winds. Seas 5 ft. 
.FRI...Light winds. Seas 4 ft. 
.FRI NIGHT...N wind 15 kt. Seas 4 ft. 
.SAT...E wind 25 kt. Seas 5 ft. 
.SUN...NE wind 25 kt. Seas 4 ft. 
.MON...NE wind 20 kt becoming light. Seas 4 ft. 

$$

What forecasters said that day

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

NWS Juneau, AK wrote its last area forecast discussion before this small craft advisory went out at Apr 11, 2:40 PM AKDT, 57 minutes earlier.

Area forecast discussion, Apr 11, 2:40 PM AKDT, 57 minutes before
Southeast Alaska Forecast Discussion
National Weather Service Juneau AK
240 PM AKDT Sun Apr 11 2021

.SHORT TERM.../Through Tue/ The wedge of cold air in the northern
panhandle from yesterday is still there though not as strong as it
was. Temperatures have managed to get up into the low to mid 30s
this afternoon in these areas. The interaction between this and
the light southerly flow across the rest of the panhandle is
producing some clouds and light snow from Gustavus and Juneau
southward to Angoon. Precip has been very light however with
little to no snow accumulation observed. Southerly winds are
starting to appear in the Lynn Canal area with Haines and Skagway
just starting to blow out of the SE and S respectively.

Main short range forecast concern is the incoming front for
tonight into tomorrow and how much snow various areas of the north
will get. Temperatures in the north continue to run noticeably
below guidance this afternoon and that trend is expected to
continue into tomorrow. The result is more snow for many areas
north of Sitka and Angoon. Yakutat remains under a winter storm
warning tonight into tomorrow. New to the collection of headlines
are winter weather advisories for Juneau, Gustavus, Elfin Cove,
and Pelican for around 3 to 5 inches of new snow. Other areas are
not expected to get as much mainly due to terrain shadowing. The
snow is expected to change to rain sometime Mon for most areas,
but the timing varies from as early as the morning hours to as
late as Mon evening. 850 mb temperatures tend to stay in the -6
degree range through the afternoon in the northern inner channels
so current thinking is more toward the later time period for
change over rather then earlier, but confidence is around average
to low on this. Naturally, when this change over occurs will have
a large effect on observed snow totals drastically lowering or
raising them according. After changing to rain the precip will
continue into Tue but at at a lower intensity as warm air
continues to be pumped into the area.

Not much in the way of wind with this system. Northern gulf winds
will be picking up into the min gale force category late tonight
into tomorrow, but beyond that mainly 25 to 30 kt winds or less
are expected for many areas as the front approaches. Breezy
conditions will likely continue for many areas into Tue as the
front lingers in the area. Another blast of gale force winds for
the northern gulf will come on Tue night as the next wave along
the front moves north.

.LONG TERM.../Tuesday through Saturday/...As the tail end of an
plume of moisture continues into the northern and central
Panhandle Tuesday, thickness numbers seem to indicate that we will
have finally switched to rain at most locations at sea level by
Tuesday morning. Of course one spot, where we will watch is White
Pass. Potentially the Haines Highway could see a slower warmup
than what is currently forecast, but for now, we are keeping a
cold rain across Haines. The energy of the atmospheric river
continues to trend westward into mid-week, as southwest flow aloft
becomes more meridional. Thus Yakutat looks to receive the most
QPF with this system. The southern Panhandle on the contrary will
see best chances of dry weather. Given how warm thicknesses will
be and how late past the vernal equinox, fifty degrees in
Ketchikan looks increasingly likely Tuesday, and it should feel
marvelous.

As the main storm track directs the bulk of the storms into the
northern and northwest gulf into mid-week, a responding ridge
blows up across western North America and pumps up much
appreciated spring-time warmth into Southeast Alaska through the
rest of the week. Thus look for a broad and remarkable warming
trend day by day. As Juneau and the northern Panhandle approaches
50 degrees by Friday, Prince of Wales Island and Ketchikan may see
60. It's about time! Were temperatures not such the headline, we
should also mention that the upper level ridge across western
Canada should keep any storms well out to see. Alas springtime
sunshine will make a grand appearance.

&&

.AJK WATCHES/WARNINGS/ADVISORIES...
PUBLIC...Winter Weather Advisory from 4 AM to 4 PM AKDT Monday for AKZ025.
     Winter Weather Advisory from 1 AM to 1 PM AKDT Monday for AKZ020-
     022.
     Winter Storm Warning until 4 PM AKDT Monday for AKZ017.
MARINE...Gale Warning for PKZ051-052.
     Small Craft Advisory for PKZ012-022-041>043-053.

&&

EAL/JWA

Visit us at http://www.weather.gov/Juneau

In the hours before

Special weather statement, Apr 11, 2:43 PM AKDT, 54 minutes before
Special Weather Statement
National Weather Service Juneau AK
243 PM AKDT Sun Apr 11 2021

AKZ018-019-021-024-121300-
Taiya Inlet and Klondike Highway-Haines Borough and Lynn Canal-
Eastern Chichagof Island-
Eastern Baranof Island and Southern Admiralty Island-
Including the cities of Skagway, Haines, Hoonah, and Angoon
243 PM AKDT Sun Apr 11 2021

...MORE ACCUMULATING SNOW POSSIBLE...

Snow accumulations possible Sunday night into Monday across the
Central and Northern Panhandle. Warmer air and rising snow levels
will lead to a transition to rain Monday afternoon through
Tuesday. Low confidence exists in the exact timing of the
changeover from snow to rain, which could significantly impact the
snowfall forecast. Visit weather.gov/juneau for the latest
forecast updates.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 10, 4:21 PM AKDTSmall Craft AdvisoryAJK3 hr
Apr 10, 9:06 PM AKDTWinter Storm WarningAJK43 hr
Apr 11, 3:36 AM AKDTGale WarningAJK24 hr
Apr 11, 3:36 AM AKDTSmall Craft AdvisoryAJK4 days
Apr 11, 1:31 PM AKDTWinter Weather AdvisoryAJK21 hr
Apr 11, 3:53 PM AKDTGale WarningAJK72 hr
Apr 11, 3:53 PM AKDTSmall Craft AdvisoryAJK3 days

Nearby

Small Craft Advisories in Alaska, 2021Every small craft advisory in 2021

Sources

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