Gale Warning 87, NWS Juneau, AK

995 
FZAK67 PAJK 301226
OFFAJK

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE JUNEAU AK
426 AM AKDT THU MAR 30 2017

OFFSHORE WATERS FORECAST FOR GULF OF ALASKA EAST OF 144W

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.

PKZ398-310630-
426 AM AKDT THU MAR 30 2017
.SYNOPSIS FOR THE EASTERN GULF OF ALASKA...
A GALE FORCE FRONT WILL MOVE EAST ACROSS THE GULF AND REACH THE
OUTER COAST BY THURSDAY EVENING. THE FRONT WILL WEAKEN OVER LAND
THROUGH THE DAY FRIDAY.  

$$

PKZ310-310630-
GULF OF ALASKA NORTH OF 55 DEGREES NORTH AND EAST OF 144 DEGREES
WEST-
426 AM AKDT THU MAR 30 2017

...GALE WARNING TODAY THROUGH TONIGHT...

.TODAY...S WIND 15 KT BECOMING SE 40 KT. SEAS 10 FT BUILDING TO
13 FT IN THE AFTERNOON. RAIN.
.TONIGHT...S WIND 40 KT DIMINISHING TO 25 KT LATE. SEAS 14 FT.
RAIN.
.FRI...S WIND 20 KT. SEAS 13 FT. SW SWELL. RAIN IN THE
MORNING. 
.FRI NIGHT...S WIND 30 KT. SEAS 16 FT. SW SWELL IN THE
EVENING. 
.SAT...SW WIND 30 KT. SEAS 20 FT. 
.SUN...S WIND 20 KT. SEAS 15 FT. 
.MON...SE WIND 30 KT. SEAS 12 FT. 

$$

240 
FZAK67 PAJK 302340
OFFAJK

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE JUNEAU AK
340 PM AKDT THU MAR 30 2017

OFFSHORE WATERS FORECAST FOR GULF OF ALASKA EAST OF 144W

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.

PKZ398-311745-
340 PM AKDT THU MAR 30 2017
.SYNOPSIS FOR THE EASTERN GULF OF ALASKA...
A GALE FORCE FRONT OVER THE CENTRAL GULF WILL REACH THE OUTER
COAST OF SE AK BY LATE THURSDAY NIGHT...THEN WEAKEN AS IT MOVES
INLAND FRIDAY.  

$$

PKZ310-311745-
GULF OF ALASKA NORTH OF 55 DEGREES NORTH AND EAST OF 144 DEGREES
WEST-
340 PM AKDT THU MAR 30 2017

...GALE WARNING THROUGH TONIGHT...

.TONIGHT...S WIND 40 KT DIMINISHING TO 25 KT LATE. SEAS 15 FT.
RAIN.
.FRI...S WIND 20 KT. SEAS 14 FT. SW SWELL. RAIN IN THE
MORNING. 
.FRI NIGHT...S WIND 25 KT. SEAS 17 FT. SW SWELL IN THE
EVENING. 
.SAT...SW WIND 30 KT. SEAS 20 FT. 
.SAT NIGHT...SW WIND 25 KT. SEAS 18 FT. SW SWELL. 
.SUN...S WIND 20 KT. SEAS 15 FT. 
.MON...SE WIND 30 KT. SEAS 12 FT. 
.TUE...SE WIND 25 KT. SEAS 15 FT. 

$$

712 
FZAK67 PAJK 311124
OFFAJK

OFFSHORE WATERS FORECAST
NATIONAL WEATHER SERVICE JUNEAU AK
324 AM AKDT FRI MAR 31 2017

OFFSHORE WATERS FORECAST FOR GULF OF ALASKA EAST OF 144W

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.

PKZ398-010530-
324 AM AKDT FRI MAR 31 2017
.SYNOPSIS FOR THE EASTERN GULF OF ALASKA...
A STORM FORCE LOW NEAR 54N 158W WILL PUSH A FRONT ACROSS THE
PANHANDLE FRIDAY. SHOWERS WILL PERSIST AS A COUPLE OF  SURFACE
TROUGHS ROTATE AROUND THE LOW AS IT GRADUALLY WEAKENS AND MOVES
NEAR 59N 150W THROUGH SATURDAY AFTERNOON.  

$$

PKZ310-010530-
GULF OF ALASKA NORTH OF 55 DEGREES NORTH AND EAST OF 144 DEGREES
WEST-
324 AM AKDT FRI MAR 31 2017

.TODAY...S WIND 25 KT. SEAS 14 FT. SW SWELL. RAIN SHOWERS EARLY
IN THE MORNING. 
.TONIGHT...S WIND 25 KT. SEAS 17 FT. SW SWELL IN THE EVENING. 
.SAT...SW WIND 30 KT. SEAS 19 FT. 
.SAT NIGHT...SW WIND 25 KT. SEAS 18 FT. SW SWELL. 
.SUN...S WIND 20 KT. SEAS 13 FT. 
.MON...SE GALE TO 40 KT. SEAS 13 FT. 
.TUE...SE WIND 30 KT. SEAS 16 FT. 

$$

Southeast Alaska Forecast Discussion
National Weather Service Juneau AK
605 AM AKDT Wed Mar 29 2017

.SHORT TERM...today through Wednesday night. South to Southwest
flow aloft is the story over all of the AK Panhandle today. The
embedded waves in this flow will bring periods of enhanced
rainfall over the region in this wet pattern which will persist
through Wednesday night.

The main change in the forecast stems from a wave developing just
south of the Gulf of Alaska this afternoon which will move into
the southeast Gulf tonight. This will not bring a big change in
the winds but could extend the precipitation later into tonight
across much of SE Alaska and could shorten the break between
systems Thursday.

Current short term forecasts had some GFS guidance added. NAM also
had a good handle on the developing wave which was more diffuse on
the ECMWF. 06Z model runs of the GFS and NAM were continuing the
development of this feature.

.LONG TERM.../Thursday through Tuesday night/ A high end gale
force low is forecast to enter the western gulf on Thursday. Gale
force winds with the associated front will arrive over outer coast
on Thursday evening and extend from Cape Suckling south pas the
Dixon Entrance. Peak conditions expected on the inside late
Thursday night with gales forecast for Clarence Strait, Sumner
Strait, southern portions of Chatham Strait, and Cross Sound.
Elsewhere on the inside, small craft winds forecast except for
northern Lynn Canal, where a parallel gradient should result in
winds 20 kt or less.

Precipitation from this front will arrive along the outer coast
late Thursday afternoon or Thursday evening. Significant low level
warm air advection associated with this front will push snow
levels higher, limiting snow to the higher elevations of the
highways.

WPC, the 00Z GFS, and the 12Z ECMWF model runs presented moderate
to good agreement at 500 mb on the placement of troughs, short
waves, and upper level ridges. A ridge extending from BC southwest
to coastal waters west of Washington State will become suppressed
over the weekend but then rebuild early next week. Temperatures
from Thursday into Friday were warmed slightly.

Confidence in the extended range forecast is average.

&&

.AJK Watches/Warnings/Advisories...
PUBLIC...None.
MARINE...Small Craft Advisory for PKZ051-052.
     Small Craft Advisory due to Seas for PKZ022-041>043-053.
&&

EZ/Bezenek/Fritsch

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