Monday, April24, 2017 L-36.com


Marine Weather and Tides
Coffman Cove, AK

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 5:15AMSunset 8:35PM Monday April 24, 2017 5:23 AM AKDT (13:23 UTC) Moonrise 5:13AMMoonset 5:56PM Illumination 3% Phase: Waning Crescent; Moon at 28 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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PKZ035 Sumner Strait- 347 Am Akdt Mon Apr 24 2017
Today..E wind 10 kt. Seas 2 ft or less.
Tonight..E wind 10 kt. Seas 2 ft or less.
Tue..E wind 15 kt increasing to 25 kt in the afternoon. Seas 4 ft.
Tue night..SE wind 20 kt. Seas 4 ft.
Wed..SE wind 15 kt. Seas 3 ft.
Thu..SE wind 15 kt becoming w. Seas 3 ft.
Fri..SW wind 10 kt becoming e. Seas 2 ft or less.

7 Day Forecast for Marine Location Near Coffman Cove, AK
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location: 56.02, -132.92     debug


Area Discussion for -
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Fxak67 pajk 232255
afdajk
southeast alaska forecast discussion
national weather service juneau ak
255 pm akdt Sun apr 23 2017

Synopsis Broad area of low pressure centered along the central
aleutians impacts the gulf of alaska with a trough extending over
gulf to the british columbia coast. Higher pressure over northern
canada will weaken as the center moves east towards hudson bay.

Short term / Sunday night to Tuesday night / an old trough
extending over the gulf and haida gwaii has clouds and light
rain/showers moving north and west across the southern panhandle
Sunday afternoon. Expect to see the light rain to continue to
work its way northward through the panhandle tonight. It isn't
until during the early day Monday when the trough has moved north
to the northern gulf that pop get more than low chance levels.

Winds over the northern coastal marine zones also increase up to
20 kt, as the through approaches.

Another short wave/surface will be developing and increasing in
strength as the feature moves east northeast of the pacific
towards the haida gwaii region later Monday with a closed surface
low pattern go be about 200 nm southwest of the island midday
Tuesday. The operational models are generally agreeing on the
feature although have presently favored the more eastern/weaker
solution pair of the nam/ec. The low should be curving north into
the southeast gulf west of prince of wales island by early
Wednesday morning. This track and strength seems to be a new path
for the solutions from previous thinking, so blended into the
Wednesday forecast periods.

The new low will spread a new front north into the southern
panhandle and help to dry out the precipitation from the northern
areas Tuesday, and then that front will start to spread the rain
northward.

Long term /Tuesday morning through Saturday/ issued 5 am Sunday
- there is not much change in the overall synoptic pattern
through next week. The polar jet will remain over the central
pacific and this will keep the storm track south of the forecast
area through mid week. There will be a stronger low pressure
system that will lift north out of the north pacific on Wednesday
and move into the eastern gulf. There are some differences with
the track of this low but the latest few model runs seem to be
picking up on this feature. As the low slowly lifts northeast
through Thursday the threat of precip will increase for the
southern half of the forecast area. The northern areas right now
will see a chance of rain. For late week into the early next
weekend there is increased onshore flow from the southwest and
with that a chance of rain with cloudy skies seems likely.

Wind wise... The inner channels will see relatively light winds
from the north through Wednesday night with weak northernly
pressure gradient. As the low moves into the eastern gulf winds
will increase to 20 kt over marine waters with 15 mph over land
from fredrick sound south. The winds will come around to the
south late in the week as a ridge builds over the northern panhandle
as the low moves into canada on Friday.

Overall there is average forecaster confidence for Tuesday and
Wednesday but lower confidence after that due to the differences
with the low moving out of the north pacific and spread in the
ensembles. Changes in the long term were modified using the 00z
nam and 12z ec through day 4 then wpc for late in the week into
the weekend.

Aviation We began the periods with vcsh in the southern zones,
and only added change groups where ceilings fluctuated through the
night and into Monday. The northern sites we added evening change
groups as channel breezes fall and then even though vcsh may occur
late tonight, we delayed adding until mvmc conditions arrived
later Monday. No imc conditions are forecast through the next 24
hours.

Marine Winds primarily 20 kt or lest through the part of next
week though will need to watch the low development Tuesday for
the southeast gulf. Seas and swells for the coastal areas 5 to 7
feet tonight and into Monday. A localized buoy is reporting 8
feet, however I suspect those will subside through the evening.

Ajk watches/warnings/advisories
Public... None.

Marine... None.

Bezenek/jwa/abj
visit us at http://

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LCNA2 - Lincoln Rock, AK 12 mi74 min ESE 6 G 8 46°F 1007.4 hPa43°F
CDEA2 - Cape Decision, AK 64 mi62 min SSE 13 G 18
KECA2 - 9450460 - Ketchikan, AK 84 mi54 min Calm G 1 44°F 46°F1009.1 hPa

Wind History for Ketchikan, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Klawock, Klawock Airport, AK33 mi31 minN 010.00 miOvercast45°F42°F90%1008.4 hPa

Wind History from AKW (wind in knots)
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Last 24hrCalmCalmCalmS63SW6CalmSE4SW4S6CalmCalmCalmN3CalmNE3NE3NE4NE5NE4--CalmCalmCalm
1 day agoNE8
G17
NE9NE8SE5NE6NE7NE8NE76N6N5NE4E6E4N4CalmNE54--CalmCalmCalmCalmCalm
2 days agoNE6N3N3Calm3S3NE33SE8
G15
S75NE7NE7E5NE9NE5NE6NE6NE6NE8
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G20
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G20

Tide / Current Tables for Lake Bay, Alaska
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Lake Bay
Click for Map
Mon -- 05:12 AM AKDT     Moonrise
Mon -- 05:22 AM AKDT     Sunrise
Mon -- 05:56 AM AKDT     -0.10 feet Low Tide
Mon -- 12:13 PM AKDT     15.85 feet High Tide
Mon -- 05:55 PM AKDT     Moonset
Mon -- 06:08 PM AKDT     -0.30 feet Low Tide
Mon -- 08:17 PM AKDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
16.114.911.97.83.80.9-0.113.87.611.514.415.815.212.68.74.51.2-0.30.53.1711.214.8

Tide / Current Tables for Exchange Cove, Alaska
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Exchange Cove
Click for Map
Mon -- 05:13 AM AKDT     Moonrise
Mon -- 05:22 AM AKDT     Sunrise
Mon -- 05:59 AM AKDT     -0.10 feet Low Tide
Mon -- 12:12 PM AKDT     14.95 feet High Tide
Mon -- 05:55 PM AKDT     Moonset
Mon -- 06:11 PM AKDT     -0.30 feet Low Tide
Mon -- 08:19 PM AKDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
15.21411.27.53.70.9-0.10.93.57.110.813.614.914.311.98.24.31.2-0.30.42.86.610.614.1

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

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for (9,2,3,4)
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Ground Weather Radar Station Biorka Is., AK
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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.