Monday, September20, 2021
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Marine Weather and Tides
Coffman Cove, AK

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:35AMSunset 7:06PM Sunday September 19, 2021 10:20 PM AKDT (06:20 UTC) Moonrise 7:14PMMoonset 4:26AM Illumination 98% Phase: Waxing Gibbous; Moon at 14 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- 330 Pm Akdt Sun Sep 19 2021
.small craft advisory Monday...
Tonight..SE wind 15 kt. Seas building to 3 ft. Rain late.
Mon..SE wind 25 kt. Gusts to 40 kt. Seas 5 ft, except 9 ft near ocean entrances. Rain.
Mon night..SE wind 25 kt. Gusts to 40 kt. Seas 5 ft, except 7 ft near ocean entrances. Rain.
Tue..SE wind 20 kt. Gusts to 35 kt. Seas 4 ft, except 9 ft near ocean entrances. Showers.
Tue night..SW wind 15 kt. Seas 3 ft, except 9 ft near ocean entrances.
Wed..S wind 15 kt. Seas 3 ft.
Thu..S wind 15 kt. Seas 3 ft.
Fri..S wind 15 kt. Seas 3 ft.


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 192307 AFDAJK

Southeast Alaska Forecast Discussion National Weather Service Juneau AK 307 PM AKDT Sun Sep 19 2021

SHORT TERM. /Sunday Evening through Tuesday Night as of 2PM Sunday/ . It is another relatively beautiful day across the majority of southeast Alaska, today, as we are still within a lull period between frontal systems. This will end very soon as a Gale force front begins to approach the Panhandle from the Gulf, tonight, bringing an end to the scattered to broken cloud cover and isolated to scattered convective shower activity across the area. It brings with it moderate to heavy rainfall with strong gusty winds to our area of responsibility.

Model forecast Integrated Water Vapor Transport(IVT) values approaching 1,200 kg/(ms) and appreciable Precipitable Water(PW) values indicate a long conveyor of deep moisture available to this system. The moisture's origin is from near the tropical Pacific. Luckily for our area, the main brunt of it will be aimed more toward the Graham Island and the western mainland British Columbia area. We will still get plenty of moderate to heavy rainfall out of this system for the Monday through Tuesday timeframe with storm total rainfall accumulation values of around 1.5 to 3 inches over the Panhandle with the highest values being due to topographic enhancement as the moisture comes ashore and over the Misty Fjords / Hyder / Southern Panhandle area, due to being so near the long moisture fetch.

Some minor instability just off the northeast Gulf coast may cause some isolated to widely scattered thunderstorms around the front late Monday night into Tuesday morning. Stability parameters from forecast model soundings and CAA aloft indicate this.

Winds up to Gale force and enhanced seas are likely over the Gulf just off the outer coast of southeast Alaska as the frontal system approaches Monday. Sustained winds over that area are expected to get up to 40 knots. Winds will likely be up to Small Craft Advisory criteria over much of the inner channels for the same timeframe. Strong winds are also expected over land areas in the southern half of the Panhandle with sustained winds of up to 25 mph and gusts up to 40 mph for Monday. Mariners traveling in the inner channels and over the eastern Gulf should exercise extra caution for the incoming strong winds and enhanced seas as the frontal system approaches.

850mb model forecast temperature advection remains warm until the cold front passes through the area Wednesday evening when the advection turns appreciably cold with 850mb temperatures over the northeastern Gulf waters and the extreme northern Panhandle reaching down to the -4 to -6C range. Afternoon highs remain near seasonable and non-impactful for the period, ranging from the middle 40s near White Pass to near 60 as you progress southward. Overnight lows will be in the upper 30s near White Pass to lower 50s with southward progression for Monday and Tuesday mornings. By Wednesday morning, after cold frontal passage, expect low temperatures to range from the middle 30s near White Pass to the middle 40s for the southern Panhandle. Clouds decreasing from overcast to broken to scattered in coverage behind the front Tuesday night should minorly aid in cooling.

Forecast confidence remains above average as we had continued good model agreement. A primarily GFS/NAM solution was used for the forecast, today, yielding only minor changes. The forecast looks to still be on track to pan out.

Another similar frontal system looks to approach The Panhandle Thursday, which may be more impactful in terms of rainfall for Southeast Alaska, due to the ground already being primed with plenty of moisture from the precipitation from the early week system.

LONG TERM. /Tuesday through Saturday night/ . The extended period will be an active, stormy period for SE Alaska and the surrounding waters as a couple of robust low pressure systems move through the Gulf. An upper level low will have moved over the region by Monday and be exiting to the east as an open wave trough Wednesday. Ridging behind the low will quickly move across the panhandle before the next upper level low tracks over the Gulf Thursday, again staying in place for a few days. Although this pattern has above average predictability it continues to have spread within the timing, location and strength.

There will be a rather short period of calmer weather Wednesday into Thursday under the upper level ridge. The late week system expected to track across the Gulf of Alaska with very strong maritime winds (potential to be storm force) and wave threats. More heavy precipitation due to a long fetch of moisture pushing northeastward into Southeast Alaska is also expected. But here model recurrence intervals for QPF showing much larger spread.

AJK WATCHES/WARNINGS/ADVISORIES. PUBLIC . Strong Wind from Monday morning through Monday afternoon for AKZ026-028. Strong Wind from Monday morning through Monday afternoon for AKZ027. MARINE . Gale Warning for PKZ041>043-051-052. Small Craft Advisory for PKZ021-022-031>036-053.



JLC/Fritsch

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LCNA2 - Lincoln Rock, AK 12 mi71 min ESE 6 G 8 53°F 53°F
CRGA2 39 mi57 min E 1 G 4.1 51°F 1013.1 hPa49°F
SPXA2 47 mi23 min SE 6 G 8 56°F 1012.6 hPa52°F
CDEA2 - Cape Decision, AK 64 mi59 min ESE 4.1 G 9.9 51°F 1013.3 hPa49°F
KECA2 - 9450460 - Ketchikan, AK 84 mi51 min ESE 4.1 G 6 53°F 54°F1015.4 hPa

Wind History for Ketchikan, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Klawock - Klawock Airport, AK33 mi28 minNNE 310.00 miFair47°F43°F86%1013.7 hPa

Link to 5 minute data for PAKW

Wind History from AKW (wind in knots)
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Last 24hrSE3Calm--S3CalmS3----CalmCalmCalmS3Calm4SW6SW7----SW6SW5S4CalmCalmN3
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--6NE8NE9NE8NE7--NE4Calm------3--S4--Calm--Calm--S3
2 days ago--N5NW3Calm--NE5NE8NE8--NE6--NE5NE54NE9NE8
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Tide / Current Tables for Lake Bay, Alaska
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Lake Bay
Click for Map
Mon -- 12:55 AM AKDT     16.95 feet High Tide
Mon -- 05:49 AM AKDT     Moonset
Mon -- 06:33 AM AKDT     Sunrise
Mon -- 07:03 AM AKDT     -1.42 feet Low Tide
Mon -- 01:32 PM AKDT     16.64 feet High Tide
Mon -- 03:54 PM AKDT     Full Moon
Mon -- 06:54 PM AKDT     Sunset
Mon -- 07:19 PM AKDT     0.14 feet Low Tide
Mon -- 07:23 PM AKDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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16.116.915.612.37.83.2-0.1-1.4-0.52.36.310.614.216.316.414.210.35.92.20.30.636.710.8

Tide / Current Tables for Exchange Cove, Alaska
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Exchange Cove
Click for Map
Mon -- 12:54 AM AKDT     16.05 feet High Tide
Mon -- 05:50 AM AKDT     Moonset
Mon -- 06:34 AM AKDT     Sunrise
Mon -- 07:06 AM AKDT     -1.42 feet Low Tide
Mon -- 01:31 PM AKDT     15.74 feet High Tide
Mon -- 03:54 PM AKDT     Full Moon
Mon -- 06:55 PM AKDT     Sunset
Mon -- 07:22 PM AKDT     0.14 feet Low Tide
Mon -- 07:24 PM AKDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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15.21614.811.77.43.1-0.1-1.4-0.625.89.913.415.515.513.49.85.62.20.30.52.76.210.2

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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