Tuesday, September26, 2017 L-36.com

Marine Weather and Tides
Attu Station, AK

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:08AMSunset 6:14PM Wednesday September 27, 2017 4:18 AM ChST (18:18 UTC) Moonrise 12:19PMMoonset 8:59PM Illumination 36% Phase: Waxing Crescent; Moon at 6 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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PKZ176 SEguam Island To Adak Pacific Side- 342 Am Akdt Tue Sep 26 2017
Today..N wind 20 kt. Seas 6 ft.
Tonight..N wind 20 kt. Seas 6 ft.
Wed..N wind 20 kt. Seas 5 ft.
Wed night..NW wind 20 kt. Seas 5 ft.
Thu..NW wind 20 kt. Seas 4 ft.
Fri..NW wind 15 kt. Seas 4 ft.
Sat..SW wind 20 kt. Seas 6 ft.

7 Day Forecast for Marine Location Near Attu Station, AK
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location: 52.84, 173.2     debug

Area Discussion for -
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Fxak68 pafc 261257
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
457 am akdt Tue sep 26 2017

Analysis and upper levels
A vertically stacked upper level low is currently located over
cold bay and moving southwest while slowly dissipating. A
northward moving portion of the sub-tropical jet stream is
advecting a large plume of moisture and warm air north into the
gulf of alaska. A surface front associated with the leading edge
of this warm moist air is spreading into southcentral, with rain
and gusty winds beginning to develop in kodiak and the northern
gulf coast. Out in the bering, an area of high pressure is nudging
east over the western aleutians leading to large scale northerly
flow across most of the bering sea and aleutian islands.

Model discussion
Models have come into better agreement regarding the overall
synoptic pattern over the state including the surface low and
warm front moving north into the gulf of alaska today. Models
begin to diverge on Wednesday as some solutions form an embedded
shortwave trough within the main low and swing it up into the
northern gulf coast. The NAM is more aggressive and forms a
separate low center along the coast leading to a storm force
barrier jet. The GFS and ec are less bullish with this feature and
have shown more consistency over the past couple of days, so the
forecast package leaned more towards those solutions.

Panc...VFR conditions and light winds will persist through the day

Short term forecast southcentral alaska (days 1 and 2)
The weakening gale force low moving into the southern gulf will be
the focus for most of the weather in the area over the next few
days. The models have trended further east with the position of
this low, and as a result winds seas in the shelikof strait- cook
inlet areas were dropped with the morning forecast package as a
much weaker pressure gradient will develop than initially
expected. Another impact of this shift in the low track was to
delay the heaviest of the rainfall along the gulf coast until late
this evening. There is some uncertainty in the exact timing in
how quickly rainfall will spread westward back into the region,
but model consensus would indicate that rain should spread
throughout the gulf coast by late tonight, and then into
southcentral for Wednesday. This could occur slightly
faster slower depending on which model solution you look at, but
there is good agreement that rain will spread into most areas at
some point by Wednesday. Afterwards, conditions should begin to
improve over southcentral from east-west late Wednesday. However,
with a slowly approaching gulf low showers will likely continue
with increasing winds into Thursday.

Short term forecast southwest alaska (days 1 and 2)
Northerly offshore flow is increasing this morning across the
coastal regions. However, winds have been weak enough for some fog
development across parts of the kuskokwim delta this morning.

This should burn off quickly by late morning with dry conditions
then persisting until a front moving toward kodiak island spreads
light rain over the alaska range Wednesday into Thursday. Dry
conditions will remain over the delta as cooler northerly winds
continue through Thursday.

Short term forecast bering sea aleutians (days 1 and 2)
A period of unusual quiescent weather looks to continue through
Thursday as broad northerly flow encompasses the entire bering
sea. Besides sporadic showers, winds will remain below 30 knots.

Long term forecast (days 3 through 7)
Day 3 (Thursday) will start off with a surface ridge centered
over shemya that extends across the vast majority of the bering
sea and an area of low pressure over kodiak island. This low
pressure system will bring decent rainfall to the gulf coast and
kodiak island before it weakens on Friday and begins to drift
eastward. The sfc ridge over the bering will quickly retreat into
the north pacific over the weekend as a pattern shift begins to
take hold across alaska and alaskan waters. The pattern change
comes in the form of the upper level pattern shifting from a more
subtropical (meridional) influence to a more arctic (zonal)
influence. This will keep the subtropical jet well south of alaska
while the arctic jet begins to strengthen as cold air begins to
build up over russia. It's that time of the year where the cold
air over russia helps low pressure systems develop strengthen over
kamchatka and siberia and the models are hinting at the potential
for several robust system to push off the russian coast and into
the bering sea next weekend and through the first half of next
week. It's way too soon to give any details on any potential
system next week but the pattern change is on the way.

Afc watches warnings advisories
Public... Flood warning 121 125.

Marine... Gale warning 132.

Synopsis and model discussion... Kvp
southcentral alaska... Dek
southwest alaska bering sea aleutians... Ja
long term... Tp

Weather Reporting Stations
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Airport Reports
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Tide / Current Tables for Massacre Bay, Attu Island, Alaska
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Massacre Bay
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Tue -- 12:20 AM HDT     Moonset
Tue -- 05:03 AM HDT     -0.07 feet Low Tide
Tue -- 09:20 AM HDT     Sunrise
Tue -- 12:38 PM HDT     2.66 feet High Tide
Tue -- 04:18 PM HDT     Moonrise
Tue -- 05:19 PM HDT     2.07 feet Low Tide
Tue -- 09:14 PM HDT     Sunset
Tue -- 10:04 PM HDT     2.68 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Chichagof Harbor, Attu Island, Alaska
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Chichagof Harbor
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Tue -- 12:20 AM HDT     Moonset
Tue -- 05:19 AM HDT     -0.07 feet Low Tide
Tue -- 09:20 AM HDT     Sunrise
Tue -- 12:51 PM HDT     2.90 feet High Tide
Tue -- 04:18 PM HDT     Moonrise
Tue -- 05:35 PM HDT     2.25 feet Low Tide
Tue -- 09:14 PM HDT     Sunset
Tue -- 10:17 PM HDT     2.92 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Puerto Rico    EDIT

Wind Forecast for (14,3,4,5)
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Ground Weather Radar Station Anderson AFB, Guam
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weather_mapweather_map weather_map

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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.