Sunday, January21, 2018 L-36.com


Marine Weather and Tides
Mercer Island, 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 7:44AMSunset 4:56PM Sunday January 21, 2018 10:26 AM PST (18:26 UTC) Moonrise 10:12AMMoonset 9:51PM Illumination 25% Phase: Waxing Crescent; Moon at 5 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- 902 Am Pst Sun Jan 21 2018
.gale warning in effect until 3 pm pst this afternoon...
.small craft advisory in effect from 3 pm pst this afternoon through Monday morning...
Today..S wind 25 to 35 kt easing to 20 to 30 kt this afternoon. Wind waves 4 to 6 ft subsiding to 3 to 5 ft this afternoon. Rain in the morning then showers in the afternoon.
Tonight..S wind 15 to 25 kt. Wind waves 2 to 4 ft. Showers likely.
Mon..S wind 15 to 25 kt easing to 5 to 15 kt in the afternoon. Wind waves 2 to 4 ft subsiding to 2 ft or less in the afternoon. Showers likely.
Mon night..S wind 5 to 15 kt. Wind waves 2 ft or less.
Tue..SE wind to 10 kt rising to 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Tue night..SE wind 5 to 15 kt. Wind waves 2 ft or less.
Wed..S wind 10 to 20 kt. Wind waves 1 to 3 ft.
Thu..S wind 20 to 30 kt easing to 15 to 25 kt. Wind waves 3 to 5 ft.
PZZ100 902 Am Pst Sun Jan 21 2018
Synopsis for the northern and central washington coastal and inland waters..A strong cold front has now moved onto the coast and will move across the inland waters late this morning. It is being preceded by gale and storm force winds. It will be followed this afternoon and tonight by moderate southerly onshore flow. A warm front on Tuesday will give strong east to southeast gradients with gales likely over the coastal waters. Beyond Tuesday, a series of fronts will continue to bring active weather to the waters through the week ahead.

7 Day Forecast for Marine Location Near Mercer Island, WA
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location: 47.54, -122.26     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 211723
afdsew
area forecast discussion
national weather service seattle wa
923 am pst Sun jan 21 2018

Synopsis A strong front will move through the area this morning.

The system will produce strong winds, rain, and mountain snow. After
a lull on Monday, another front will cross western washington
Tuesday night and Wednesday. A cool showery upper trough will reach
the area Thursday.

Short term A strong cold front will push inland this morning
with high winds along the coast and north interior. Winds will
ease this afternoon as this system moves farther inland and
weakens. Meanwhile, heavy precipitation will cause flooding on
the skokomish river with heavy snow expected in the olympics and
cascades. The air mass is cold unstable under the trough offshore
and we could see thunderstorms this afternoon. The trough will
maintain showers tonight with the focus for heavy showers
continuing in the mountains.

Showers will taper down on Monday as the trough exits east and a
weak ridge starts to build over the pac nw. Temperatures will be
near to few degrees cooler than normal.

The front will arrive on Tuesday but looks like it will split and
weaken as it moves inland. Snow levels will remain low in the
mountains with a few more inches of snow expected. 33

Long term Previous discussion... More impulses in the flow will
keep rain in the forecast Wednesday and Thursday. A cold upper
trough will move over the area Thursday night, lowering snow
levels to below 1000 feet. Another system will approach the area
Friday and next weekend looks pretty wet. Burke

Aviation Strong cold front preceded by strong wind is currently
moving inland from the coast. Winds at the surface and aloft will
ease quickly around mid-day. Strong southwest flow aloft will
become moderate westerly today. Onshore flow and a few showers
will follow the front, increasing low- level moisture and lowering
cigs. The air mass behind the front will become somewhat unstable,
with an isolated thunderstorm possible over the coastal waters and
along the coast this afternoon and evening.

Ksea... Strong cold frontal passage expected around 19z-20z. A
brief period of moderate rain with reduced vsby is expected during
the hour of fropa. South winds will ease immediately following
fropa, and wind shear will lessen. CIGS in the 025-040 range will
be common following the front through tonight. In the post-frontal
environment, should get a wave of showers every few hours through
Monday morning. Haner

Marine Strong cold front has recently moved onto the coast.

Storm and gale force winds precede the front. As the front passes
by, winds will quickly ease. This has already occurred over the
coastal waters and will occur later this morning over the inland
waters. A wind gust to 65 knots at eastpoint (north of the san
juans) prompted the short-fuse issuance of a storm warning for the
northern inland waters. This is in effect until noon.

Winds will rapidly decrease behind the front, but winds over the
coastal waters and some of the inland waters will continue to blow
at small craft advisory level (above 20 knots). Seas over the
coastal waters will slowly subside over the course of this
afternoon, tonight, and Monday.

A warm front on Tuesday will give strong east to southeast
gradients for gales over the coastal waters and small craft
advisory conditions elsewhere. Additional fronts will give active
weather to the waters Wednesday through the end of the upcoming
week. Haner

Hydrology The skokomish river in mason county is likely to rise
above flood stage around midday today with minor flooding expected.

Heavy rain, possibly 2-3 inches, is expected in the lower elevations
of the olympics by this morning. Otherwise river flooding is not
expected for the next 7 days.

Rainfall through Sunday will probably push the USGS landslide
indices close to thresholds for shallow landslides.

Sew watches warnings advisories
Wa... Winter weather advisory until 9 am pst Monday for cascades of
pierce and lewis counties-cascades of snohomish and king
counties.

Winter storm warning until 9 am pst Monday for cascades of
whatcom and skagit counties-olympics.

Flood watch through this evening for hood canal area-lower
chehalis valley area-olympics.

Wind advisory until noon pst today for everett and vicinity-hood
canal area.

High wind warning until noon pst today for admiralty inlet area-
san juan county-western skagit county-western whatcom
county.

High wind warning until 10 am pst this morning for central coast-
north coast.

High surf advisory until 3 pm pst this afternoon for central
coast-north coast.

Coastal flood advisory until 10 am pst this morning for
admiralty inlet area.

Wind advisory until 10 am pst this morning for eastern strait of
juan de fuca.

Pz... Small craft advisory for rough bar until 9 pm pst Monday for
grays harbor bar.

Small craft advisory until 3 pm 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-west entrance u.S. Waters strait of
juan de fuca.

Small craft advisory until 9 am pst Monday for admiralty inlet-
east entrance u.S. Waters strait of juan de fuca-northern
inland waters including the san juan islands.

Storm warning until noon pst today for east entrance u.S. Waters
strait of juan de fuca-northern inland waters including the
san juan islands.

Small craft advisory until 6 am pst Monday for central u.S.

Waters strait of juan de fuca.

Gale warning until 11 am pst this morning for central u.S.

Waters strait of juan de fuca.

Gale warning until noon pst today for admiralty inlet.

Small craft advisory from 3 pm this afternoon to 9 am pst Monday
for puget sound and hood canal.

Gale warning until 3 pm pst this afternoon for puget sound and
hood canal.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EBSW1 - 9447130 - Seattle, WA 6 mi39 min S 12 G 18 52°F 48°F1007.2 hPa
WPOW1 - West Point, WA 13 mi27 min S 20 G 22 50°F 1006.8 hPa (-0.4)41°F
46120 17 mi34 min WSW 16 50°F 1005.6 hPa41°F
TCMW1 - 9446482 - Tacoma Met, WA 20 mi39 min SSE 12 G 18
TCNW1 - 9446484 - Tacoma, WA 21 mi45 min 51°F 48°F1007.5 hPa
PTWW1 - 9444900 - Port Townsend, WA 48 mi39 min ESE 11 G 18 44°F 47°F1006.8 hPa

Wind History for Seattle, Puget Sound, WA, WA
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Last
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S6
G10
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S11
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SE12
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boeing Field - King County International Airport, WA2 mi34 minS 17 G 2510.00 miOvercast52°F37°F59%1007 hPa
Renton Municipal Airport, WA3 mi34 minESE 510.00 miOvercast50°F37°F63%1007.4 hPa
Seattle, Seattle-Tacoma International Airport, WA7 mi34 minS 19 G 2810.00 miOvercast and Breezy51°F37°F59%1007.6 hPa

Wind History from BFI (wind in knots)
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1 day agoSE10S14
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2 days agoSE13S13S9
G16
6CalmS6W6S3SE5SE9SE7SE7SE7E4SE7SE6S3SE6SE7S6S7SE7SE8S7

Tide / Current Tables for Duwamish Waterway, Washington
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Duwamish Waterway
Click for Map
Sun -- 01:13 AM PST     0.44 feet Low Tide
Sun -- 07:47 AM PST     Sunrise
Sun -- 08:05 AM PST     11.97 feet High Tide
Sun -- 10:11 AM PST     Moonrise
Sun -- 02:21 PM PST     4.91 feet Low Tide
Sun -- 04:54 PM PST     Sunset
Sun -- 07:15 PM PST     8.85 feet High Tide
Sun -- 09:51 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.30.50.82.44.77.39.711.31211.610.58.97.25.755.167.28.28.88.67.76.34.6

Tide / Current Tables for Restoration Point, 0.6 miles ESE of, Washington Current
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Restoration Point
Click for Map
Sun -- 01:56 AM PST     0.00 knots Slack
Sun -- 04:26 AM PST     0.69 knots Max Flood
Sun -- 07:48 AM PST     Sunrise
Sun -- 08:16 AM PST     -0.00 knots Slack
Sun -- 10:12 AM PST     Moonrise
Sun -- 11:31 AM PST     -0.70 knots Max Ebb
Sun -- 03:37 PM PST     0.00 knots Slack
Sun -- 04:41 PM PST     0.18 knots Max Flood
Sun -- 04:54 PM PST     Sunset
Sun -- 07:01 PM PST     -0.00 knots Slack
Sun -- 09:52 PM PST     Moonset
Sun -- 11:00 PM PST     -0.72 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.6-0.300.40.70.70.60.30.1-0.2-0.5-0.7-0.7-0.6-0.4-0.10.10.20.10-0.2-0.5-0.7-0.7

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 (13,3,4,5)
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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.