Monday, December18, 2017 L-36.com


Marine Weather and Tides
Seattle, WA

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 7:52AMSunset 4:20PM Monday December 18, 2017 1:02 AM PST (09:02 UTC) Moonrise 7:59AMMoonset 5:07PM Illumination 0% Phase: New Moon; Moon at 0 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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PZZ135 Puget Sound And Hood Canal- 852 Pm Pst Sun Dec 17 2017
.gale warning in effect until midnight pst tonight...
.small craft advisory in effect from midnight tonight to 6 am pst Monday...
Tonight..S wind 25 to 35 kt easing to 15 to 25 kt after midnight. Wind waves 4 to 6 ft subsiding to 2 to 4 ft after midnight. Rain.
Mon..SE wind 10 to 20 kt easing to 10 kt in the afternoon. Wind waves 1 to 3 ft subsiding to 1 ft or less in the afternoon. Rain likely.
Mon night..SE wind to 10 kt. Wind waves 1 ft or less. Rain.
Tue..S wind 15 to 25 kt rising to 20 to 30 kt in the afternoon. Wind waves 2 to 5 ft.
Tue night..SW wind 5 to 15 kt. Wind waves 2 ft or less.
Wed..Variable wind to 10 kt becoming N in the afternoon. Wind waves 1 ft or less.
Wed night..Light wind. Wind waves less than 1 ft.
Thu..Light wind. Wind waves less than 1 ft.
Fri..Light wind. Wind waves less than 1 ft.
PZZ100 852 Pm Pst Sun Dec 17 2017
Synopsis for the northern and central washington coastal and inland waters..A frontal system draped over the area tonight will sag south Monday morning. A second vigorous frontal system will move through the area Monday night and Tuesday. An associated deepening surface low will cross the waters Tuesday. Offshore flow will develop Wednesday and continue Thursday and Friday.

7 Day Forecast for Marine Location Near Seattle, WA
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location: 47.68, -122.41     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 180551
afdsew
area forecast discussion
national weather service seattle wa
951 pm pst Sun dec 17 2017

Synopsis A cold front over southwest british columbia will move
across the northwest part of the state overnight and the rest of
the area Monday morning. Expect a warm front to move across the
southwest part of the state Monday afternoon. A strong cold front
will move across the region on Tuesday and usher in a colder air
mass. High pressure aloft will prevail on Wednesday for dry and
chilly weather.

Short term
A cold front over southwest british columbia will move across the
northwest part of the CWA overnight and the rest of the area
Monday morning. Expect a warm front to move across the southern
part of the forecast area Monday afternoon. The main impact these
fronts will have on our weather will be to keep conditions wet
and unsettled. Locally gusty winds can also be expected ahead of
and with the approaching cold front. So far, mount baker has
received about 10 inches of new snow. Total new snowfall
accumulations of 6 to 11 inches are likely on the north cascades
(king county northward) by late Monday morning.

Meanwhile, on the lowlands, expect rain at times through the
period although parts of the puget sound region will remain in the
rain shadow due to strong westerly flow downsloping off the
olympic range. It looks like convergence zone will develop Monday
morning, so this will give parts of the north sound and, perhaps,
the central sound a better chance of decent rainfall.

A stronger system will impact the area Monday night into Tuesday
as a strong frontal system approaches and then moves inland. The
main impacts will be the potential for heavy snow in the
mountains. A winter storm watch is in effect for the olympics and
north cascades where amounts of 1-3 feet are possible.

Winds will be gusty with the frontal passage on Tuesday,
especially over the coast and south puget sound where winds will
gust to 40 mph.

A cold upper level trough will move across the region Tuesday
night into Wednesday, resulting in snow levels falling to near
1,000 feet. This means there could see a few light snow showers
in the cascade foothills Wednesday morning. Other areas to watch,
in the lowlands, will be the strait of juan de fuca and western
whatcom county.

An amplified upper level ridge centered near 138w will provide
the region with dry, northerly flow aloft on Wednesday. 33 05

Long term from the prev discussion
A new wrinkle in the pattern brings a threat of lowland snow
Thursday night and Friday. Models show the ridge offshore
retrograding while a shortwave trough tracks S SE into western
washington. The cool setup is already here with the dry offshore
flow, temperatures in the lower 30s and snow levels near the
surface. Light accumulations are possible but exact details are
still unclear since this system is still several days out. This
system exits Friday afternoon with the threat of showers ending.

Otherwise, the high amplitude ridge offshore will continue to
bring dry and cool weather through next weekend and into christmas
day. Temperatures are trending below normal with lows in the 20s
and highs only in the 30s. 33

Aviation A front draped across the area tonight will sag south
Monday and then lift back north as a warm front Monday night.

Westerly flow aloft will continue. The air mass is moist and
stable.

Ksea... MVFR low clouds are expected to be prevalent tonight and
Monday. Gusty south wind 10-20 knots will ease Monday morning.

Schneider

Marine A front over the area tonight will bring small craft
advisory strength winds to most waters. Gales in puget sound are
expected to end after midnight as winds begin to ease. A westerly
surge is expected in the strait of juan de fuca later tonight.

The front will sag south Monday with winds generally easing. A
second vigorous frontal system will move through the area Monday
night and Tuesday with a warm front lifting north through the area
Monday night and a cold front shifting inland Tuesday.

An associated deepening surface low will move across the area
Tuesday. This will likely bring gales to at least some waters.

Models differ on the track of the low which will affect which
areas get the strongest winds and makes the wind forecast a bit
tricky. For now, the expectation is the low will make landfall
along the north coast with the strongest winds to the south.

Offshore flow will develop Wednesday and continue Thursday and
Friday. Schneider
hydrology... River flooding is not expected the next 7 days.

Sew watches warnings advisories
Wa... Winter weather advisory until 10 am pst Monday for cascades of
snohomish and king counties-cascades of whatcom and skagit
counties above 3500 feet.

Winter storm watch from Monday evening through late Tuesday
night for cascades of whatcom and skagit counties above 2500
feet.

Winter storm watch from Monday evening through Tuesday afternoon
for olympics above 3000 feet.

Pz... Gale watch from late Monday night through Tuesday afternoon for
coastal waters from james island to point grenville 10 to
60 nm-coastal waters from james island to point grenville
out 10 nm-coastal waters from point grenville to cape
shoalwater 10 to 60 nm-coastal waters from point grenville
to CAPE shoalwater out 10 nm.

Small craft advisory until 4 am pst Monday for coastal waters
from CAPE flattery to james island 10 to 60 nm-coastal
waters from CAPE flattery to james island out 10 nm-coastal
waters from james island to point grenville 10 to 60 nm-
coastal waters from james island to point grenville out 10
nm-coastal waters from point grenville to CAPE shoalwater
10 to 60 nm-coastal waters from point grenville to cape
shoalwater out 10 nm-northern inland waters including the
san juan islands-west entrance u.S. Waters strait of juan
de fuca.

Small craft advisory until 10 am pst Monday for central u.S.

Waters strait of juan de fuca-east entrance u.S. Waters
strait of juan de fuca.

Small craft advisory from 2 am to 10 am pst Monday for admiralty
inlet.

Small craft advisory until 6 am pst Monday for puget sound and
hood canal.

Gale warning until midnight pst tonight for puget sound and hood
canal.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WPOW1 - West Point, WA 2 mi63 min S 27 G 30 48°F 1013.9 hPa (-0.4)47°F
46120 6 mi34 min W 23 49°F 1013 hPa47°F
EBSW1 - 9447130 - Seattle, WA 7 mi45 min S 8.9 G 18 50°F 50°F1014.7 hPa
TCMW1 - 9446482 - Tacoma Met, WA 28 mi45 min SSW 11 G 19
TCNW1 - 9446484 - Tacoma, WA 29 mi51 min 52°F 51°F1015.7 hPa
PTWW1 - 9444900 - Port Townsend, WA 35 mi51 min ESE 1.9 G 4.1 48°F 48°F1013.9 hPa

Wind History for Seattle, Puget Sound, WA, WA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boeing Field - King County International Airport, WA12 mi70 minS 12 G 1710.00 miOvercast51°F45°F80%1014.5 hPa
Renton Municipal Airport, WA16 mi70 minSSE 1010.00 miOvercast51°F44°F77%1015.1 hPa
Everett Snohomish County, WA17 mi70 minSSE 18 G 2510.00 miOvercast and Breezy47°F44°F90%1013.9 hPa
Seattle, Seattle-Tacoma International Airport, WA17 mi70 minS 17 G 225.00 miOvercast with Haze49°F44°F83%1015.1 hPa
Bremerton, Bremerton National Airport, WA24 mi67 minS 14 G 216.00 miLight Rain Fog/Mist45°F44°F97%1015.8 hPa

Wind History from BFI (wind in knots)
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Last 24hrS8SE10SE11SE7SE8SE7SE8SE6S10S12S11
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1 day agoSE5SE4S3SE3CalmSE3CalmSE4SE4SE3SE4S3SE6S6SE5S5SE4SE5SE5SE7SE7SE8SE7SE7
2 days agoN3S4S3SE6SE4SE4S7CalmSE6SE64S5SE8S5S5S5SE5SE4SE5CalmE5SE4S4SE3

Tide / Current Tables for Meadow Point, Shilshole Bay, Washington
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Meadow Point
Click for Map
Mon -- 06:01 AM PST     11.67 feet High Tide
Mon -- 07:53 AM PST     Sunrise
Mon -- 07:58 AM PST     Moonrise
Mon -- 11:10 AM PST     6.95 feet Low Tide
Mon -- 03:55 PM PST     10.13 feet High Tide
Mon -- 04:19 PM PST     Sunset
Mon -- 05:07 PM PST     Moonset
Mon -- 11:03 PM PST     -0.94 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.52.65.27.89.911.211.711.310.18.77.577.27.98.99.810.19.68.46.54.11.7-0.2-0.9

Tide / Current Tables for Alki Point, 0.3 miles W of, Washington Current
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Alki Point
Click for Map
Mon -- 01:57 AM PST     0.79 knots Max Flood
Mon -- 05:53 AM PST     -0.00 knots Slack
Mon -- 07:53 AM PST     Sunrise
Mon -- 07:58 AM PST     Moonrise
Mon -- 08:24 AM PST     -0.39 knots Max Ebb
Mon -- 12:01 PM PST     0.00 knots Slack
Mon -- 01:33 PM PST     0.17 knots Max Flood
Mon -- 03:40 PM PST     -0.00 knots Slack
Mon -- 04:19 PM PST     Sunset
Mon -- 05:07 PM PST     Moonset
Mon -- 07:42 PM PST     -0.66 knots Max Ebb
Mon -- 11:28 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.70.80.70.50.3-0-0.3-0.4-0.4-0.3-0.1-00.10.20.1-0.1-0.3-0.5-0.6-0.7-0.6-0.4-0.1

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 Seattle, WA (4,6,7,8)
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Ground Weather Radar Station Seattle/Tacoma, WA
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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.