Sunday, June24, 2018

Marine Weather and Tides
Attu Station, AK

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:54AMSunset 6:51PM Monday June 25, 2018 2:16 AM ChST (16:16 UTC) Moonrise 4:39PMMoonset 1:28AM Illumination 86% Phase: Waxing Gibbous; Moon at 11 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- 336 Am Akdt Sun Jun 24 2018
.small craft advisory through tonight...
Today..NE wind 20 kt. Seas 8 ft. Areas of fog.
Tonight..N wind 20 kt. Seas 8 ft. Patchy fog.
Mon..N wind 20 kt. Seas 7 ft.
Mon night..NW wind 15 kt. Seas 6 ft.
Tue..Variable wind 10 kt. Seas 5 ft.
Wed through Thu..W 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 241322
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
522 am akdt Sun jun 24 2018

Analysis and upper levels
Southwestward propagating scattered showers linger from the
copper river basin to the talkeetnas as the first of two upper-
level shortwaves continues its westward progression over southern
alaska. Scattered showers are also lingering over northern
portions of the akpen aided in part by orographic enhancement from
a weak northerly flow and a weak trough extending along the
alaska range. Farther west, IR satellite shows an increase in mid-
and upper-level cloud cover across the central aleutians as the
next storm system begins to take shape.

Any well-organized storm activity remains south of our region as
the longwave trough over the bering keeps the jet over the north
pacific. Instead, our weather continues to be dictated by
shortwave troughs in the mid-levels ejecting from two broad area
of circulation. The first is a 545dm low in the northeastern gulf
pinwheeling easterly waves across southern alaska. This will
continue to bring the threat for scattered showers and
thunderstorms through Monday. The second, a broad 540dm low in
the northern bering, is ejecting shortwaves along the aleutians.

This is helping spin up a weak surface low and steer a front
across the aleutians.

Model discussion
The models are all still in good agreement with the large-scale
synoptic features. The NAM and GFS are also in better agreement as
to the timing and placement of the second shortwave moving east
to west across southern alaska today. Models keep lingering
showers over interior southcentral alaska this morning with
another round of showers and isolated thunderstorms firing up over
the copper river basin, talkeetnas and interior portions of
southwest alaska this afternoon and evening.

Panc...VFR conditions and light winds will persist. Conditions
could approach MVFR briefly this morning depending on how much
shower activity approaches the airport.

Short term forecast southcentral alaska (today through Tuesday)
There is a distinct difference between the relatively benign
weather over the gulf from weak high pressure and the much more
active and showery weather over the south mainland from a series
of easterly waves pushing through the region. The first of which
has brought widespread rainfall to the copper river basin
overnight, and will continue spreading westward into the susitna
valley this morning where it will persist into the evening. There
remains uncertainty in how far south these showers will develop,
leading to lower confidence in the pop forecasts for the anchorage
bowl and matanuska valley today. Instability looks slightly
stronger than what occurred yesterday afternoon, which should
allow for more lightning strikes over the northern copper river
basin and talkeetnas this afternoon. While most of the
thunderstorm activity will dissipate by late this evening, the
continued track of weak easterly waves moving over the area will
keep showers in the forecast from the kenai peninsula northward
into Monday.

Starting Monday, model agreement begins to break down as a
shortwave trough moving northward though the gulf begins to
interact with the easterly waves over the mainland. This
disagreement continues to impact forecast confidence and finer
scale details in the pop forecast. In general the forecast is for
cloudy and showery weather will persisting through Monday,
especially for the copper river basin susitna valley which should
continue to see the most widespread shower activity.

Short term forecast southwest alaska (Sunday and Monday)
Generally quiet conditions are in place across much of southwest
alaska to start out this morning. The exception are an area of
scattered to numerous showers generally north of king salmon and
east of dillingham. The rest of the area is under mostly cloudy
skies. During the day Sunday, a thermal trough building
southwestward out of interior alaska will increase the instability
for much of the area north of the nushagak hills. Widespread
showers with isolated embedded thunderstorms are expected across
the lower kuskokwim valley late this morning through the
afternoon. Convective activity that largely initiates along the
nushagak hills, kuskokwim mountains the the alaska range north of
lake iliamna will drift northwestward with time, extending the
threat of isolated thunderstorms to bethel and points north and
east this evening.

A northward moving atmospheric wave on Monday will confine the
thunderstorm activity largely to the immediate kuskokwim valley
and points north, with significant initiation expected off the
alaska range midday as well. The wave will bring in a more stable,
cool, moist air mass to southwest alaska, making Tuesday a
noticeably cooler day with considerable cloud cover expected

Short term forecast bering sea aleutians (Sunday and Monday)
A large, elongated low currently over the western aleutians and
its associated front is causing a widespread area of precipitation
from adak eastward through almost to dutch harbor this morning.

This feature will be the primary weather maker across the bering
for the first half of the week. Tonight, the triple point low
developing east of the parent low will take over as the primary
low near adak. That low will slowly drift eastward through Monday,
weakening as it does so. Thus, the steady heavier precipitation
will diminish with time into a scattered shower regime by Monday.

Long term forecast (days 3 through 7)
A long wave pattern across the state will bring a persistent
pattern of diurnal showers inland and periods of light rain across
the bering and gulf of alaska. The low pressure center will
reside near the alaska peninsula during the long range forecast. A
surface low organizes Tuesday night as two strong waves of energy
merge together as they wrap around the core of the low. This will
send a relatively weak front to the southern mainland on
Wednesday with lingering showers through the end of the week as
the organized low slowly fills while it spins near the alaska
peninsula. The to the west of this system, low clouds and patchy
fog will be the main theme for the western aleutians and bering as
a ridge builds from the north pacific. Only minor changes were
made for updates as models are in relatively good agreement with
the synoptic pattern through the end of next week.

Afc watches warnings advisories
Public... None.

Marine... None.

Synopsis and model discussion... Tm
southcentral alaska... Dek
southwest alaska bering sea aleutians... Jw
long term... Kh

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Shemya, Eareckson AFB, AK49 mi78 minNE 101.13 miLight Drizzle Fog/Mist43°F42°F98%998.3 hPa

Wind History from ASY (wind in knots)
Last 24hrE26
1 day agoN3S6S9S6S5S5SE5SE5SE8SE6SE6--SE9SE11SE12SE12E13E16E14E16E18E18E22
2 days agoSW11SW9SW10SW7S9SW11S11W12S13SW13SW16NW13W13S11W9W10S5S13W7W8S12S10SW4W6

Tide / Current Tables for Massacre Bay, Attu Island, Alaska
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Massacre Bay
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Sun -- 02:32 AM HDT     3.56 feet High Tide
Sun -- 05:27 AM HDT     Moonset
Sun -- 07:02 AM HDT     Sunrise
Sun -- 10:37 AM HDT     -0.21 feet Low Tide
Sun -- 06:57 PM HDT     2.48 feet High Tide
Sun -- 08:38 PM HDT     Moonrise
Sun -- 08:46 PM HDT     2.44 feet Low Tide
Sun -- 11:56 PM HDT     Sunset
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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Sun -- 02:45 AM HDT     3.88 feet High Tide
Sun -- 05:27 AM HDT     Moonset
Sun -- 07:02 AM HDT     Sunrise
Sun -- 10:53 AM HDT     -0.23 feet Low Tide
Sun -- 07:10 PM HDT     2.70 feet High Tide
Sun -- 08:39 PM HDT     Moonrise
Sun -- 09:02 PM HDT     2.66 feet Low Tide
Sun -- 11:56 PM HDT     Sunset
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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GOES Local Image of    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.

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (12,3,4,5)
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Ground Weather Radar Station Anderson AFB, Guam
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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 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 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.