Tuesday, June25, 2019 L-36.com


Marine Weather and Tides
Akutan, AK

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Sunrise 4:17AMSunset 11:46PM Tuesday June 25, 2019 5:37 PM AKDT (01:37 UTC) Moonrise 12:30AMMoonset 12:29PM Illumination 39% Phase: Third Quarter Moon; Moon at 23 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PKZ171 Unalaska Bay- 310 Pm Akdt Tue Jun 25 2019
.small craft advisory through Wednesday night...
Tonight..SE wind 25 kt. Seas 4 ft. Areas of fog. Rain.
Wed..SE wind 25 kt. Seas 4 ft. Areas of fog. Rain.
Wed night..SE wind 25 kt. Seas 3 ft. Areas of fog. Rain.
Thu..S wind 15 kt. Seas 2 ft.
Thu night..W wind 25 kt. Seas 3 ft.
Fri..SW wind 15 kt. Seas 2 ft.
Sat through Sun..W wind 10 kt. Seas 2 ft.


7 Day Forecast for Marine Location Near Akutan, AK
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location: 54.23, -165.53     debug


Area Discussion for -
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Fxak68 pafc 260025
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
425 pm akdt Tue jun 25 2019

Analysis and upper levels
The pattern remains very much the same as the last 24 hours. Fog
and stratus continue to plague much of the bering and marine
locations across southcentral. A weak trough of lower pressure
is sandwiched between the ridge of high pressure over the copper
river basin and the building ridge over the alaska peninsula. This
trough ushered in stronger southwest flow which helped to bring
smoke from the swan lake fire up through many of the population
centers overnight into this morning. Much of the smoke is
lifting breaking up this afternoon as the june Sun helps to
provide some mixing to the atmosphere. Some thunderstorms have
fired over the copper river basin, but they are expected to be
more limited in strength and coverage today as stability
increases.

The only real upper level (30,000') jet activity to speak of is
supporting the broad trough over the bering. A piece of the jet
cuts under the base of the trough over the north pacific at 115
kts. A weak finger at 80 kts is helping to ferry some of the
moisture up along the west coast of the mainland. Light rain is
falling across the central aleutians up through nunivak island.

Model discussion
Models remain nearly in lock step, so forecast confidence is very
high in the synoptic pattern. The couple of areas that could
prove challenging will be the marine stratus across the cook inlet
and gulf of ak, the smoke density and movement, and the high
temperatures as they relate to sea breezes. In general, the nam
nest was preferred for details, but most updates were made with
hand edits.

Aviation
Panc...VFR conditions and light winds will persist. Smoke should
continue to dissipate through the evening.

Fire weather Swan lake fire... Western kenai peninsula: the 2
main stories over the fire area will be the shift in wind
direction and the hot temperatures low minimum rh that will
develop for the end of the week. As the trough exits to the east
tonight, a strong ridge of high pressure will build in. Flow
around the fire is already starting to respond and turn back to a
more northerly direction. As the ridge sets up over kodiak island
over the next couple of days, the general steering flow will
become northerly. However, surface winds will remain susceptible
to local and diurnal influences. Temperatures will rise through
the end of the week pushing into at least the low to mid 80s.

Minimum rh values will also be on the decline reaching the low to
mid 30s by thu. The high pressure will also put a cap on any
convective potential.

.Short term forecast southcentral alaska (days 1 through 3 tonight
through Friday)...

a weak upper level short-wave combined with thermal trough over
interior southcentral will once again lead to some showers and
thunderstorms across the susitna valley and copper river basin
this evening. An upper level ridge will then build in from the
west and strengthen through Friday. The combination of subsidence
underneath the ridge and offshore flow will lead to hot and dry
conditions across the region. This includes coastal communities
such as seward, whittier, valdez, and cordova where locally gusty
offshore winds will delay the onset of sea breezes each day.

The smoke in anchorage and the mat-su should improve tonight
through Friday as winds shift from southwest to northwest. Under
this new flow regime, which will dominate the next few days, the
bulk of smoke from the swan lake fire (on the western kenai
peninsula) will move across the eastern kenai peninsula and out
into the gulf of alaska and western prince william sound.

.Short term forecast southwest alaska (tonight through Friday
night)...

a warmer weather pattern will continue to build through the
weekend. A weather front across the eastern bering will slowly
stall out west of the mainland. Most areas will see plenty of
sunshine through the afternoon and evening hours, with the
exception of the coastal areas of bristol bay and most of the
kuskokwim delta. That same area is the only area that is set to
see any shower activity. Thunderstorm activity is not expected
across the region today, nor the alaska range, as instability
is marginal and a building ridge will inhibit any vertical
growth. As we move into the middle and end of the week, ridging
will dominate. Temperatures across the interior will continue
their upward trend, with widespread 80s expected by Thursday.

.Short term forecast bering sea aleutians (tonight through Friday
night)...

a front extending from low pressure across the western bering is
bringing active weather across to the central and eastern
aleutians. Rain, clouds and southerly winds will be a semi-
permanent fixture across this area through the end of the week as
high pressure to the east, stalls the eastward progression of this
front. High pressure will begin to nose in across the central
aleutians and bering on Friday, while a kamchatka low will bring
rain to unsettled weather to the western bering late into the
week.

Marine (days 3 through 5)
(Friday through Sunday)

Bering sea and aleutian coastal waters...

a front will slowly cross the western half of the bering and
aleutians during this time, while slowly weakening as it bumps
into a ridge of high pressure. Sustained winds along and ahead of
this front look to remain just below gale force, but the models
have been trending up slightly with this aspect of it, thus some
low-end gales aren't totally out of the question. Otherwise, look
for seas to peak near 10 feet. Further east, winds and waves
will remain below small craft conditions.

Gulf of alaska...

a ridge of high pressure will remain in control. Some offshore
flow will likely develop over the weekend, but, even near the
coast winds look to remain below small craft conditions.

Long term forecast (days 4 through 7)
(Saturday through Tuesday)
forecast uncertainty remains high for the beginning to middle of
next week, as the numerical guidance continues to struggle with
their overall placement of synoptic features. In general, they
agree that there will be several areas of low pressure located
across the western bering and eastern siberia, rotating around one
another in a fujiwhara pattern, with a downstream ridge centered
over southcentral.

As it does so, a significant disturbance breaks off of the low
sometime Sunday night into Monday, and tracks across the north
slope as it acts to flatten the ridge. How strong is this piece of
energy and where does it exactly track is the dilemma, as the
ecmwf is much quicker to flatten said ridge and displace it much
farther southwest, compared to the GFS and canadian global
models. This has significant effects on the overall height field
alignment and relates to how much of this warmth maintains over
southwest and southcentral alaska, while also having important
effects on the central and eastern bering and aleutians.

A further southwest centering of the low, per the ECMWF which has
the mid level ridge repositioned to well of shemya, compared to
the GFS canadian consensus of it repositioning to just south of
cold bay or dutch harbor, would have a cooler and wetter solution
for much of the mainland with decreased fog potential across the
bering and aleutians.

After coordinating with our national weather prediction center and
internal discussions here at the forecast office, preference is
for a slower breaking down of the ridge, similar to the GFS and
canadian solutions. This is typically what tends to happen as the
models all too often try to dislodge or breakdown these ridges,
and with limited surface and upper air observations across the
bering and aleutians, the models have a harder time trying to
initialize the overall pattern.

Afc watches warnings advisories
Public... Flood advisory 145.

Marine... Gale 172.

Fire weather... None.

Synopsis and model discussion... Mso
southcentral alaska... Seb
southwest alaska bering sea aleutians... Ss
marine long term... Pd


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
UNLA2 - 9462620- Unalaska, AK 59 mi55 min SSE 13 G 23 56°F 46°F1004.3 hPa

Wind History for Unalaska, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Unalaska, Unalaska Airport, AK58 mi41 minSE 810.00 miLight Rain55°F48°F80%1004.3 hPa

Wind History from ADU (wind in knots)
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2 days agoE7CalmE3E3E4E5E5E3CalmCalmCalmCalmS4SW3CalmS4SE4S6CalmS8S8SE11SE9SE9

Tide / Current Tables for Akun Bay, Akun Island, Alaska
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Akun Bay
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Tue -- 01:38 AM AKDT     2.77 feet High Tide
Tue -- 01:48 AM AKDT     Last Quarter
Tue -- 03:30 AM AKDT     Moonrise
Tue -- 06:29 AM AKDT     Sunrise
Tue -- 07:58 AM AKDT     1.28 feet Low Tide
Tue -- 01:25 PM AKDT     1.63 feet High Tide
Tue -- 03:29 PM AKDT     Moonset
Tue -- 06:17 PM AKDT     1.13 feet Low Tide
Tue -- 11:40 PM AKDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.52.72.82.62.31.91.61.41.31.31.41.51.61.61.61.51.41.21.11.21.31.51.82.2

Tide / Current Tables for Trident Bay, Akun Island, Alaska
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Trident Bay
Click for Map
Tue -- 01:48 AM AKDT     Last Quarter
Tue -- 03:30 AM AKDT     Moonrise
Tue -- 04:21 AM AKDT     1.05 feet Low Tide
Tue -- 06:30 AM AKDT     Sunrise
Tue -- 09:28 AM AKDT     2.04 feet High Tide
Tue -- 02:40 PM AKDT     0.93 feet Low Tide
Tue -- 03:29 PM AKDT     Moonset
Tue -- 09:56 PM AKDT     3.41 feet High Tide
Tue -- 11:39 PM AKDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.82.21.61.21.11.11.31.61.9221.81.51.210.91.11.41.92.533.33.43.2

Weather Map and Satellite Images
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GOES Local Image of Alaska    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Bethel, AK
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.