Monday, March27, 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 6:33AMSunset 7:32PM Monday March 27, 2017 2:43 AM AKDT (10:43 UTC) Moonrise 6:49AMMoonset 7:03PM Illumination 0% Phase: New Moon; Moon at 29 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
    EDIT      (on/off)   Help
PKZ035 Sumner Strait- 318 Pm Akdt Sun Mar 26 2017
.small craft advisory Monday...
Tonight..E wind 20 kt. Seas 4 ft. Rain late.
Mon..SE wind 25 kt diminishing to 15 kt by late afternoon. Seas 5 ft subsiding to 3 ft by late afternoon. Rain.
Mon night..SE wind 20 kt. Seas 4 ft...except 7 ft near ocean entrances. Rain.
Tue..S wind 10 kt. Seas 2 ft or less...except 6 ft near ocean entrances. Rain.
Tue night..SE wind 10 kt. Seas 2 ft or less...except 5 ft near ocean entrances. Rain.
Wed..E wind 15 kt becoming w. Seas 3 ft.
Thu..SE wind 20 kt. Seas 4 ft.
Fri..SE wind 25 kt. Seas 5 ft.

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


Area Discussion for -
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxak67 pajk 262338
afdajk
southeast alaska forecast discussion
national weather service juneau ak
338 pm akdt Sun mar 26 2017

Short term A low W of haida gwaii will move nnw and reach the
far NE gulf by Mon afternoon. There were some model differences on
track and strength of this low, but based on satellite and obs at
18z, the 12z ECMWF and gem were handling this low the best, so
used them through 18z mon, then transitioned to previous forecast
by 00z Tue (for pressures/winds).

Main forecast concerns will be precip potential/ptype/amounts and
winds. As of 23z, rain was still just S of the far southern area.

Am expecting this precip to move N into the southern area this
evening. Looking like precip will reach the central area overnight
tonight, then the N Mon morning. The precip may be spotty
initially over the N half due to offshore flow, but later Mon this
offshore flow will weaken and allow more widespread precip to
occur. The precip will reach the NE gulf coast the latest,
probably late Mon morning. As far as ptype goes, much of the N and
central area will see at least some snow due to evaporative
cooling and some diurnal cooling of lower levels late tonight and
early Mon morning. Do not think this snow will last much past
mid-morning Mon through as boundary layer warms. Exception to this
would be over the far N where snow could mix in most of the
morning into the afternoon before the boundary layer warms.

Snowfall over the N third could reach an inch or 2 by mid-morning
mon with highest amounts over the far n. Over the remainder of the
area, little or no snow accumulation is expected.

Strongest winds will be on N and E side of low moving through the
e gulf tonight and mon. Should be some gales early tonight over
the far SE gulf, with SCA level winds expected over the remaining
gulf area. Winds on inner channels will pick up some tonight with
many areas reaching SCA levels especially over the more e-w
channels. N lynn canal will also pick up to SCA levels this
evening as northerly pressure gradient increases ahead of the low.

Looking like peak winds on most inner channels will occur mon
morning, with a diminishing trend in the afternoon as low reaches
the far NE gulf and weakens.

Long term Difficult forecast for Monday night with another
potential low moving up from the N pacific into the SE gulf. The
mid level low centered over the ak peninsula continues to rotate
waves over the ak gulf. There is a wave crossing up on Monday
evening which would help to push up a surface low to the north.

At the surface operational models have a large spread with this
feature. Gfs/canadian show a deeper gale force low moving further
north compared to the NAM and especially the ecmwf. However no
model shows agreement on the exact position and track of the low.

Decided to use a blend of gfs/nam as a compromise with a broad
brush approach to wind coverage, not going as high as the gfs
winds but stronger than ecmwf/nam.

Once this system passes through models fall more in line depicting
the next series of waves and lows tracking into the region. There
will be a brief drier period Tuesday into Wednesday, especially
for the southern regions as the next wave moves into the central
gulf with ridging over the southern panhandle. Southwesterly
onshore flow keeping chance pops over most of the area with a weak
front crossing over the northern regions. Late Thursday into
Friday will be the next significant system. This low originates
off the coast of japan, tracking across the pacific and into the
ak gulf by the end of the week. Expecting at minimum gale force
winds from this low over the gulf and wide spread heavy precip.

Warm air advection will likely produce mostly rain from this
system. Both 850 temp and precipitable water anomalies show this
system to be rather warm with deep layer moisture.

Besides to early gfs/nam blend not much change to extended
forecast as models were still mostly in line. A few nudges for
winds to a ecmwf/nam blend then update with new wpc. Forecast
confidence is very low initially but rises after the Monday night
system.

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

Marine... Gale warning for pkz041-042.

Small craft advisory for pkz012-013-021-022-031-033>036-043-051-
052.

Small craft advisory due to seas for pkz053.

Rwt/prb
visit us at http://

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LCNA2 - Lincoln Rock, AK 12 mi34 min SE 20 G 25 42°F 1000.6 hPa37°F
CDEA2 - Cape Decision, AK 64 mi82 min E 22 G 33
KECA2 - 9450460 - Ketchikan, AK 84 mi44 min ESE 8.9 G 16 43°F1003.6 hPa (+1.4)

Wind History for Ketchikan, AK
(wind in knots)    EDIT      (on/off)   Help
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
Last
24hr
SE6
G10
NE6
G11
NE8
G12
NE10
G19
NE8
G16
NE2
G7
NE4
G11
NE10
G14
NE5
G13
S6
G15
SE3
G14
SE1
E5
G12
SE7
G15
SE5
G9
SE10
G24
SE3
E8
G11
E9
G20
SE6
G10
E11
G21
E8
G17
SE10
G17
SE9
G16
1 day
ago
SE7
G11
E7
G11
SE5
G8
SE5
N2
G8
E1
G5
E5
G8
SE4
G7
E4
SE8
G11
E4
G10
SE8
G13
SE8
G11
SE8
SE7
G10
SE4
G8
SE4
G7
SE9
G16
SE8
G12
SE9
G12
SE11
G15
SE10
G15
SE8
G11
SE8
G13
2 days
ago
NW3
G6
W1
G4
NW4
NW4
G7
NW3
G6
NW6
W5
W5
S4
G8
NW5
NW3
G6
SE2
E1
--
--
W1
G4
W6
NW2
--
SE5
G9
SE10
G13
SE10
G13

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Klawock, Klawock Airport, AK33 mi51 minN 010.00 miOvercast41°F35°F79%1001.4 hPa

Wind History from AKW (wind in knots)
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
Last 24hrNE6NE8NE11
G16
NE11
G21
NE8
G17
NE11
G15
NE14
G19
NE10
G18
NE8
G17
NE10
G17
NE10
G17
NE9
G15
NE7
G15
NE3E11
G19
NE96NE9
G15
NE84Calm4CalmCalm
1 day agoCalm--SW3SW7S7S7CalmSW8
G17
3S54NE3SW63CalmCalmNE63N3NE43NE4NE4NE4
2 days agoNE8NE13
G17
NE10
G17
NE9
G17
NE11
G17
NE9
G18
NE10
G19
NE10
G18
NE11
G19
NE11
G17
NE8
G16
NE8
G18
NE7
G17
NE6NE8NE5NE6N5NE6NE6CalmCalmCalmCalm

Tide / Current Tables for Lake Bay, Alaska
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Lake Bay
Click for Map
Mon -- 01:11 AM AKDT     16.70 feet High Tide
Mon -- 06:34 AM AKDT     Sunrise
Mon -- 06:49 AM AKDT     Moonrise
Mon -- 07:03 AM AKDT     -0.45 feet Low Tide
Mon -- 01:20 PM AKDT     17.33 feet High Tide
Mon -- 06:59 PM AKDT     New Moon
Mon -- 07:02 PM AKDT     Moonset
Mon -- 07:20 PM AKDT     -1.62 feet Low Tide
Mon -- 07:20 PM AKDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
15.216.715.913.18.84.30.9-0.40.63.57.61215.417.216.814.19.74.70.6-1.5-1.11.55.510.2

Tide / Current Tables for Exchange Cove, Alaska
   EDIT      (on/off)   Help   One Week of Data
Exchange Cove
Click for Map
Mon -- 01:10 AM AKDT     15.80 feet High Tide
Mon -- 06:34 AM AKDT     Sunrise
Mon -- 06:49 AM AKDT     Moonrise
Mon -- 07:06 AM AKDT     -0.45 feet Low Tide
Mon -- 01:19 PM AKDT     16.43 feet High Tide
Mon -- 06:59 PM AKDT     New Moon
Mon -- 07:03 PM AKDT     Moonset
Mon -- 07:21 PM AKDT     Sunset
Mon -- 07:23 PM AKDT     -1.62 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
14.415.815.112.48.44.20.9-0.40.43.27.211.314.616.315.913.39.24.50.6-1.4-1.21.25.19.6

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for (6,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Biorka Is., AK
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.