Wednesday, November22, 2017 L-36.com


Marine Weather and Tides
SeaTac, 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 7:24AMSunset 4:27PM Wednesday November 22, 2017 4:42 AM PST (12:42 UTC) Moonrise 10:49AMMoonset 8:02PM Illumination 15% Phase: Waxing Crescent; Moon at 4 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- 242 Am Pst Wed Nov 22 2017
Today..S wind 5 to 15 kt. Wind waves 2 ft or less. Rain likely.
Tonight..S wind 5 to 15 kt. Wind waves 2 ft or less. Rain.
Thu..SW wind 15 to 25 kt. Wind waves 2 to 4 ft. Rain in the morning then showers likely in the afternoon.
Thu night..S wind 15 to 25 kt. Wind waves 2 to 4 ft.
Fri..S wind 15 to 25 kt. Wind waves 2 to 4 ft.
Fri night..S wind 5 to 15 kt becoming variable after midnight. Wind waves 2 ft or less.
Sat..NE wind 10 to 20 kt becoming se. Wind waves 1 to 3 ft.
Sun..S wind 10 to 20 kt becoming se 5 to 15 kt. Wind waves 1 to 3 ft.
PZZ100 242 Am Pst Wed Nov 22 2017
Synopsis for the northern and central washington coastal and inland waters..Strong southerly flow will continue over the waters through today ahead of a frontal system over the offshore waters. The front will move into the waters late tonight and will be followed by a trough on Thursday. A deepening low will move north through the offshore waters on Saturday.

7 Day Forecast for Marine Location Near SeaTac, WA
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location: 47.42, -122.28     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 221046
afdsew
area forecast discussion
national weather service seattle wa
300 am pst Wed nov 22 2017

Synopsis An unseasonably warm moist air flow will continue into
Thursday morning before the frontal system moves inland. Though the
rain will ease today, this system will bring more rain to western
washington tonight before turning to showers with cooler air
Thursday. After another break on Friday, another weather system is
expected to arrive Saturday afternoon and night with another system
arriving Sunday night.

Short term Water vapor and IR satellite imagery continues to show
a long fetch of warm moist air extending from well east of the
hawaiian islands northward into the pacific northwest east of the
elongated upper trough near 145w. Following the warm front Tuesday,
the air mass over western washington was quite mild and muggy with
temperatures and dewpoints both in the 50s early this morning.

Doppler weather radar showed the rain eased overnight as anticipated
with the relative break in the rain continuing today. May break a
few record highs today in this warm air mass and some record warm
lows may fall as well. Snow levels to also remain above 8000 ft
today.

The next shortwave rounding the offshore upper trough should engage
the warm moist southerly flow to generate another surge of rain
tonight and progs concur. Rain amounts should be less than what fell
Tuesday - about 2-4 inches in the olympics, 1.5-3.5 inches in the
cascades and about a half to 1.5 inches in the lowlands. See the
hydro section below for more on the flood situation and refer to the
latest flood bulletins for current river information.

Soil conditions to remain moist. Will continue the heightened
landslide threat special statement.

The frontal system is expected to move onshore and inland Thursday
bringing a cooler air mass and turning the rain to showers. Snow
levels should fall close to 4000 ft by late Thursday. The showery
pattern should continue into Friday with cooler more seasonable high
temperatures. Buehner

Long term The guidance is in rather good agreement with the
overall pattern into early next week. The next digging upper trough
well offshore should send another surge of warm moist air and rain
ne through the region Saturday with the front moving inland Saturday
night. Snow levels will pop up again in the 5000 to 7000 ft range
before dropping again behind the front Sunday around 4000 ft for
those returning across the cascades from the holiday. The progs do
differ on the front's associated surface low. But given the vertical
stacked nature, the low should weaken as it moves inland. Guidance
is implying more ridging aloft and a more zonal flow pattern for a
decrease in the precipitation early next week. Buehner

Aviation Moist southwest flow aloft will continue through
Thursday. At the surface, southeasterly pressure gradients will
prevail. Strong south to southwest winds 35 to 50 kt will continue
at times between 030 and 050 through Thursday.

An area of showers north of a line from near kuil ese to ksea is
lifting north while widely scattered showers are seen south of that
line. The air mass across the area has originated near hawaii and is
quite moisture laden. Hence ceilings are quite variable withVFR
conditions seen between showers, and lifr conditions are seen where
flow is upslope or around heavier showers. Visibilities are
occasionally falling below 2sm in the heavier showers. Overall,
expect conditions to improve somewhat this afternoon and some
clearing at times may occur to the lee of the olympics as strong ssw
flow aloft interacts with the terrain. Rain showers will increase
and conditions will deteriorate after 03z this evening as a frontal
system offshore approaches. Albrecht
ksea... Conditions have improved toVFR early this morning, but any
showers passing the area will possibly lower CIGS to 015, especially
this morning. Conditions will become mainly MVFR this evening in
precipitation and lower ceilings as the front offshore approaches.

Southeast winds 5-8 kt this morning will become southerly 10-14 kt
this afternoon and tonight. Winds aloft will be strong at
times... Over 50 knots at 5000 feet. Albrecht

Marine A frontal system will approach the waters from the west
this afternoon then move inland late tonight. The front will be
followed by a trough of low pressure on Thursday. Expect small craft
advisory conditions for most of the waters today except for puget
sound and the central portions of the strait of juan de fuca.

Southwest winds will continue on Thursday as the trough of low
pressure moves across the waters. Most waters, including the puget
sound and hood canal will likely see small craft advisory conditions
on Thursday.

Another system will arrive on Saturday. The 06z GFS brings the
system through the interior of western washington as an open wave
while the preferred ECMWF and canadian model solutions deepen a low
to below 980 mb as it lifts northward through the offshore waters.

The preferred solutions would result in gales over most waters with
small craft advisory conditions over puget sound and hood canal.

Albrecht

Hydrology Several western washington rivers are above flood
stage early this morning, and a few more are probably going to rise
above flood stage today. As of day break flood warnings are likely
to be in effect for the satsop, skokomish, cowlitz, white,
snoqualmie, skykomish, snohomish, and stillaguamish rivers. Most
rivers will produce minor flooding, but a few could reach the
moderate category.

Warnings and watches change as needed. For the current list, please
check:

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 12 mi43 min S 1 G 1.9
TCNW1 - 9446484 - Tacoma, WA 13 mi43 min 57°F 52°F1014.6 hPa (+0.3)
EBSW1 - 9447130 - Seattle, WA 13 mi43 min E 1.9 G 5.1 59°F 51°F1014.2 hPa (+0.0)
WPOW1 - West Point, WA 19 mi43 min SSE 11 G 13 58°F 1014.1 hPa (+0.0)58°F
46121 26 mi34 min 7.8 58°F 1013.8 hPa56°F

Wind History for Tacoma MET, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Seattle, Seattle-Tacoma International Airport, WA2 mi50 minS 610.00 miOvercast58°F57°F97%1014.9 hPa
Renton Municipal Airport, WA6 mi50 minSSE 410.00 miOvercast55°F55°F100%1014.5 hPa
Boeing Field - King County International Airport, WA8 mi50 minN 010.00 miOvercast55°F55°F100%1014 hPa
Tacoma, Tacoma Narrows Airport, WA19 mi50 minS 610.00 miOvercast59°F57°F93%1014.7 hPa
Tacoma / McChord Air Force Base, WA21 mi45 minS 410.00 miOvercast58°F57°F100%1014.9 hPa
Pierce County-Thun Field, WA22 mi48 minSSE 7 G 1310.00 miOvercast64°F57°F78%1014.6 hPa

Wind History from SEA (wind in knots)
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Last 24hrCalmNW4NE5N4W3CalmCalmCalmSE6SE9SW4S5S9S9S7S9SE8SE6S3E3SE6SE5S4S6
1 day agoSW3SE5W5NW11NW3S7SW4CalmSW6SW9SW11SW9SW4CalmNE6E6E6E5E6E6N4N8N3NE4
2 days agoSE6SE8S4SE11SE10S9SW7S5S7SW10SW7SW3SW6S6S12S9S3CalmE5SE7SE6SE4SE4SE6

Tide / Current Tables for Des Moines, Washington
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Des Moines
Click for Map
Wed -- 12:44 AM PST     -0.47 feet Low Tide
Wed -- 07:24 AM PST     Sunrise
Wed -- 08:07 AM PST     12.13 feet High Tide
Wed -- 10:48 AM PST     Moonrise
Wed -- 01:43 PM PST     6.85 feet Low Tide
Wed -- 04:26 PM PST     Sunset
Wed -- 06:12 PM PST     9.60 feet High Tide
Wed -- 08:02 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.1-0.40.62.65.17.810.111.612.111.810.99.487.16.97.48.39.19.69.48.46.84.92.8

Tide / Current Tables for Skagit Bay, 1 mile N of Rocky Point, Washington Current
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Skagit Bay
Click for Map
Wed -- 01:34 AM PST     0.00 knots Slack
Wed -- 05:41 AM PST     0.94 knots Max Flood
Wed -- 07:25 AM PST     Sunrise
Wed -- 08:10 AM PST     -0.00 knots Slack
Wed -- 10:49 AM PST     Moonrise
Wed -- 01:05 PM PST     -0.75 knots Max Ebb
Wed -- 03:26 PM PST     0.00 knots Slack
Wed -- 04:26 PM PST     Sunset
Wed -- 05:28 PM PST     0.09 knots Max Flood
Wed -- 05:36 PM PST     -0.00 knots Slack
Wed -- 08:03 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.1-0.50.20.50.80.90.90.60.1-0.2-0.4-0.6-0.7-0.7-0.6-0.100.1-0.1-0.2-0.4-0.7-0.9-1

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 (7,2,3,4)
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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.