Monday, November20, 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 6:21AMSunset 5:51PM Tuesday November 21, 2017 1:40 AM ChST (15:40 UTC) Moonrise 8:59AMMoonset 5:30PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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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PKZ178 Kiska To Attu- 317 Am Akst Mon Nov 20 2017
.gale warning today...
Today..SW wind 35 kt. Seas 17 ft. Rain.
Tonight..W wind 25 kt. Seas 14 ft.
Tue..SE wind 25 kt. Seas 12 ft. Rain.
Tue night..SW wind 35 kt. Seas 13 ft.
Wed..NW wind 35 kt. Seas 13 ft.
Thu through Fri..SW wind 30 kt. Seas 12 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 201424
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
524 am akst Mon nov 20 2017

Analysis and upper levels
The strong vertically stacked low in the southern gulf reached
its maximum depth early this morning and is now starting to move
south with the associated frontal system stretched across the
northern gulf following slowly south as well. With the exception
of kodiak island which the edge of the frontal system is
currently rotating across, precipitation is ending and skies
clearing across southern mainland alaska this morning with gusty
north to northeasterly outflow winds developing.

Over the alaska peninsula and the eastern aleutians, post frontal
cold air advection as well as strong northerly winds aloft have
been bringing strong north to northwesterly winds particularly
through channeled gaps and passes. Ridging is building over the
central aleutians and central bering ahead of a frontal system
pushing into the western aleutians.

Model discussion
Models are in good agreement with regards to the deep low in the
gulf and the trough frontal system crossing the bering today and
tonight. The low crossing the bering on Wednesday however, offers
more challenges. While all the models agree that it will deepen
rapidly, significant differences persist in the track, timing and
strength as it turns southeast and tracks across southwest alaska
or along or offshore of the southwest alaska coast.

Aviation
Panc... Breezy northerly winds and dry offshore flow will keep
conditionsVFR at anc with high clouds clearing out this morning.

Short term forecast southcentral alaska (days 1 through 3)
A powerful storm force low over the gulf of alaska is showing an
impressive and well defined circulation on satellite as the low
wraps up into a beautiful occlusion. Some very light snow over the
southern copper basin continues this morning, but this will end
quickly as weak ridging builds in and offshore winds increase
today. This offshore wind event will tend to favor higher mountain
gaps near the coast with the strongest winds through thompson
pass. For inland locales, local winds should be much weaker, and
in some cases, local inversions may keep winds light and high
temperatures quite a bit lower today.

Shortwave ridging will begin to build into southcentral tonight,
allowing for weakening offshore winds and cold overnight low
temperatures. A shortwave trough in westerly flow will move into
the region Tuesday evening and overnight. However, the upper
trough will be weakening and shearing as it moves east, so snow
threats look minimal given the amount of low level dry air which
will be in place.

Short term forecast southwest alaska (days 1 and 2)
Breezy conditions will cause blowing snow concerns to persist
through through tonight, before the next system moves into the
region for Tuesday. Before that system arrives, short-wave
ridging aloft will move across the region Monday evening into
Tuesday morning, with clearing skies. Winds will generally remain
in the 15 to 35 mph range though, with blowing snow concerns
persisting. Cooler overnight lows will be another artifact of the
departing storm, as colder air continues to funnel in from the
north.

The next in a series of storms will begin to affect the region on
Tuesday, as a low passing by well to the north sends another cold
front across the region. Winds will become southerly ahead of
this feature with widespread light snow developing along the coast
by sunrise, spreading eastward through the day. Accumulations
will be light though with most locations seeing less than 3
inches, even across the interior. Drier conditions and decreasing
clouds return for Tuesday night into Wednesday morning, before yet
another more potent storm arrives for your Wednesday.

Short term forecast bering sea aleutians (days 1 and 2)
Strong winds will persist for eastern portions of the akpen
and adjacent waters through late morning, with some gusts to 55
mph remaining possible. These winds will decrease through the
afternoon as a shortwave ridge across the west central aleutians
traverses the region through tomorrow morning.

Just like a scene from a movie you may know, a repeat scenario is
in store for your weather as we head into the Tuesday afternoon
through Wednesday morning time frame. During this time, a 995 mb
low near shemya Tuesday evening will head northeast while
deepening. Patchy fog is possible along and south of an attendant
warm front, with widespread precipitation developing. This storm
looks to continue to strengthen heading into Wednesday with
increasing winds and precipitation coverage intensity.

Long term forecast (days 3 through 7)
On Tuesday, a low well north of the arctic circle will bring a
front through the southern portion of the mainland, with a brief
shot of snow for the entire region and some short-lived outflow
winds for the southcentral area. Tuesday night and Wednesday will
be the literal calm before the storm for most of the state, as a
low pressure system enters the western bering late Tuesday night
and strengthens rapidly as it crosses the bering.

Models have been relatively consistent with the track of this
storm varying a little to the south over the past day. Current
forecast is for the low to cross the northern bering and move
onshore near nunivak island late Wednesday night, before moving
southeastward over the kuskokwim delta and bristol bay before
heading into the gulf on Thursday night. It is still expected to
be a storm force low and significant winds and waves are currently
in the forecast for the bering sea... With some concern for high
winds and seas in the bristol bay region on Wednesday. Behind
this storm another northwesterly punch will bring high winds for
the pribilofs and the ak pen, not unlike the pattern from this
weekend. As the storm moves into the gulf, northwesterly outflow
winds will again be the concern for southcentral on Friday. On
Saturday, the pattern begins again with another low approaching
from the southwest, although this system appears to take a more
northerly track along the kamchatka peninsula, hopefully lessening
the wind and wave threat in alaska for next weekend.

Afc watches warnings advisories
Public... None.

Marine... Gale warning 119 120 127 130 131 136 137 138 139 150 155
165 172 177 178 180 181 185.

Storm warning 132.

Synopsis and model discussion... Jer
southcentral alaska... Ja
southwest alaska bering sea aleutians... Pd
long term... Lf


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Shemya, Eareckson AFB, AK49 mi1.7 hrsS 24 G 334.00 miLight Rain Fog/Mist and Windy44°F44°F100%1009.8 hPa

Wind History from ASY (wind in knots)
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Last 24hrSE28SE23SE24SE28
G35
SE25
G34
SE30
G38
SE30
G35
SE29
G39
SE25
G36
SE29
G38
SE32
G40
SE25
G36
SE28
G38
SE26
G34
S32
G38
S25
G36
S26
G31
S28
G35
S29
G36
S27S27
G34
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G32
S24
G33
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G32
1 day agoW20
G25
NW21
G27
NW22
G28
NW22
G26
NW16
G24
NW17NW16
G22
W15NW14NW9W6W6SW6W10W6W6SW7S6S11S10SE14SE15SE18SE22
2 days agoS27
G34
S26
G33
S22
G29
S22
G27
S21
G27
S22
G31
S25S26
G31
S23
G30
S16S13SW11W8W9W11NW6NW7W7NW8NW10NW15NW22NW17W16

Tide / Current Tables for Massacre Bay, Attu Island, Alaska
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Massacre Bay
Click for Map
Mon -- 01:03 AM HST     -0.17 feet Low Tide
Mon -- 09:32 AM HST     3.67 feet High Tide
Mon -- 10:00 AM HST     Sunrise
Mon -- 11:58 AM HST     Moonrise
Mon -- 02:18 PM HST     3.17 feet Low Tide
Mon -- 04:58 PM HST     3.28 feet High Tide
Mon -- 06:25 PM HST     Sunset
Mon -- 08:30 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0-0.2-00.411.72.433.43.63.63.53.43.23.23.23.23.33.232.62.11.40.8

Tide / Current Tables for Chichagof Harbor, Attu Island, Alaska
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Chichagof Harbor
Click for Map
Mon -- 01:19 AM HST     -0.18 feet Low Tide
Mon -- 09:45 AM HST     4.00 feet High Tide
Mon -- 10:00 AM HST     Sunrise
Mon -- 11:58 AM HST     Moonrise
Mon -- 02:34 PM HST     3.46 feet Low Tide
Mon -- 05:11 PM HST     3.57 feet High Tide
Mon -- 06:24 PM HST     Sunset
Mon -- 08:30 PM HST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.1-0.2-0.10.30.91.72.53.23.73.943.93.73.63.53.53.53.63.53.332.41.71

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

GOES Local Image of Puerto Rico    EDIT
Geos

Wind Forecast for (10,2,3,4)
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Ground Weather Radar Station Anderson AFB, Guam
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weather_mapweather_map weather_map

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Disclaimer:
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.