Tuesday, December10, 2019
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Marine Weather and Tides
SeaTac, WA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:43AMSunset 4:20PM Tuesday December 10, 2019 12:58 PM PST (20:58 UTC) Moonrise 3:39PMMoonset 5:56AM Illumination 99% 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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PZZ135 Puget Sound And Hood Canal- 810 Am Pst Tue Dec 10 2019
Today..S wind 10 to 20 kt. Wind waves 1 to 3 ft. Patchy fog in the morning. A chance of rain in the morning then rain likely in the afternoon.
Tonight..S wind 10 to 20 kt becoming 5 to 15 kt after midnight. Wind waves 1 to 3 ft. A chance of rain in the evening.
Wed..S wind 10 to 20 kt. Wind waves 1 to 3 ft. A slight chance of rain in the morning then rain likely in the afternoon.
Wed night..S wind 20 to 30 kt easing to 15 to 25 kt after midnight. Wind waves 3 to 5 ft.
Thu..S wind 15 to 25 kt. Wind waves 2 to 4 ft.
Thu night..S wind 15 to 25 kt. Wind waves 2 to 4 ft.
Fri..S wind 5 to 15 kt becoming sw. Wind waves 2 ft or less.
Sat..S wind to 10 kt. Wind waves 1 ft or less.
PZZ100 810 Am Pst Tue Dec 10 2019
Synopsis for the northern and central washington coastal and inland waters..A weakening front will move through the area today. A stronger frontal system will affect the region Wednesday and Thursday. Onshore flow Friday will ease 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 101603 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 803 AM PST Tue Dec 10 2019

SYNOPSIS. An upper level ridge will slide east of the area this morning. A weak front will move through Western Washington this afternoon through this evening. Stronger weather systems will move through Wednesday night into Friday with wet, breezy weather along with mountain snow.

UPDATE. /Through this morning/ . Just some minor tweaks to the forecast this morning to account for some areas of fog and to speed the progress of this morning's front slightly. Otherwise the forecast remains on track and no further updates are planned this morning. -Wolcott-

SHORT TERM /TODAY THROUGH THURSDAY/. Satellite imagery shows low clouds across much of the Puget Sound and coastal areas this morning with widespread high clouds ahead of the next system. The frontal system will move through Western Washington through today with light rain reaching Puget Sound later this afternoon. Snow levels with this system will be around 4000 feet, however there is limited precipitation as the front is weakening. An inch or two is possible at Stevens Pass and higher elevations later today into tonight. High temperatures will be in the upper 40s.

Wednesday morning will be generally dry across the area with the next system on approach. This second system will be stronger and be more December-like bringing more widespread Lowland rain, breezy/windy conditions, and mountain snow. The initial front will slide onshore midday Wednesday and move east through the day. Along with widespread rainfall, southeasterlies will be rather noticeable for portions of the North Interior with gusts up to 35-40 MPH Wednesday night. Breezy conditions elsewhere across Western Washington with a decent BLI-YZT pressure gradient.

Another element with the late Wednesday-Thursday frontal systems will be mountain snow. Snow levels at the onset of the precipitation Wednesday evening will be in 3500-4000 foot range for accumulating snowfall for the higher passes, including Stevens Pass. Snow levels will not vary much through Thursday for decent snow accumulations above 3500 feet, at least advisory level. Snoqualmie Pass should see a rain/snow mix at points through Thursday, however snow levels are not too far off for more snow than rain at the Pass.

One other aspect to this system will be the rather cool air aloft on Thursday following the front. Precipitation will become more showery in nature during the afternoon. Instability appears to be rather limited (100-300 J/kg), but with lifted indices to -2 would at least suggest the chance for thunderstorms for coastal areas, so have added for Thursday afternoon.

Showery weather for Thursday night as the system slides east of Western Washington. Temperatures Wednesday and Thursday will be in the upper 40s to low 50s across the area. JD

LONG TERM /FRIDAY THROUGH MONDAY/. The wet weather should be around through Friday as the upper trough slides east of the area. Deterministic guidance suggests a brief upper level ridge is possible Saturday afternoon into Sunday morning as an upper trough stays south of the area. However, given the proximity of the trough and ensemble guidance, have slight chance of POPs. Active weather for Sunday afternoon through Monday as another system moves through. Temperatures in the 40s through the weekend across Western Washington. JD

AVIATION. A front near the coast this morning will move to the interior of Western Washington this afternoon and evening. Southwest flow aloft will become westerly behind the front. The low overcast over much of the interior lowlands will lift as the front moves ashore today--we will see if the front is strong enough to stir things up and improve conditions more than the current TAFs show.

KSEA . The front might stir things up and improve conditions more than the 15z TAF shows--after all, the low clouds had scattered out of Shelton at 16z.

MARINE. A weakening front will move through the area today with small craft advisory strength southeast winds for the Coastal Waters and West Entrance Strait of Juan de Fuca.

A stronger frontal system crosses the area Wednesday and Thursday. Gale force southeast winds are possible for the Coastal Waters, East Entrance Strait of Juan de Fuca, and Northern Inland Waters with the strongest winds expected Wednesday evening. Small craft advisory strength winds are expected elsewhere with this frontal system. Thursday could be a blustery day with stronger gradients as a trough moves ashore. Onshore flow Friday will ease Saturday. West swell 14- 17 feet are expected to reach the area Wednesday night and continue into Friday before subsiding on Saturday.

HYDROLOGY. River flooding is unlikely for the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES. WA . None. PZ . Gale Watch from Wednesday afternoon through late Wednesday night 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.

Small Craft Advisory until 2 PM PST this afternoon 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.

Gale Watch from Wednesday afternoon through late Wednesday night for East Entrance U.S. Waters Strait Of Juan De Fuca- Northern Inland Waters Including The San Juan Islands.



www.weather.gov/seattle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 12 mi65 min ESE 7 G 8
TCNW1 - 9446484 - Tacoma, WA 13 mi65 min 43°F 52°F1021.7 hPa
WPOW1 - West Point, WA 19 mi59 min S 15 G 17 44°F 1020.4 hPa (-0.8)42°F
46120 24 mi48 min S 7.8 46°F 1019.4 hPa41°F
46125 38 mi58 min 45°F 1019.2 hPa41°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 mi66 minS 610.00 miOvercast43°F37°F82%1021.5 hPa
Renton Municipal Airport, WA6 mi66 minS 510.00 miOvercast42°F37°F82%1021.6 hPa
Boeing Field - King County International Airport, WA8 mi66 minSE 810.00 miOvercast44°F39°F83%1021 hPa
Tacoma, Tacoma Narrows Airport, WA19 mi66 minS 53.00 miLight Rain Fog/Mist41°F37°F89%1021.1 hPa
Tacoma / McChord Air Force Base, WA21 mi2 hrsSE 310.00 miOvercast40°F40°F100%1021.6 hPa
Pierce County-Thun Field, WA22 mi84 minN 06.00 miFog/Mist39°F39°F100%1021 hPa

Link to 5 minute data for KSEA

Wind History from SEA (wind in knots)
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Last 24hrNE3NE44NE5N3NE3SE5S4Calm4CalmCalmS4SE7S6S5S6S4SE9SE9SE8S4S6S6
1 day agoCalmNW3W3N5N3N3N4N3N5N7NE7NE4NE4N4N4E4N5NE4N4NE4NE45S43
2 days agoCalmE3CalmSE5SE3CalmCalmCalmN3NW4N3CalmNW4CalmNW6N6NE3CalmN4NW3CalmN3NW3Calm

Tide / Current Tables for Des Moines, Washington
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Des Moines
Click for Map
Tue -- 04:39 AM PST     11.06 feet High Tide
Tue -- 05:56 AM PST     Moonset
Tue -- 07:45 AM PST     Sunrise
Tue -- 09:40 AM PST     6.84 feet Low Tide
Tue -- 02:43 PM PST     11.27 feet High Tide
Tue -- 03:39 PM PST     Moonrise
Tue -- 04:18 PM PST     Sunset
Tue -- 10:00 PM PST     -0.81 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.45.98.21010.91110.49.27.976.97.58.7101111.210.596.84.21.7-0.1-0.8-0.1

Tide / Current Tables for Restoration Point, 0.6 miles ESE of, Washington Current
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Restoration Point
Click for Map
Tue -- 12:41 AM PST     0.67 knots Max Flood
Tue -- 04:35 AM PST     -0.00 knots Slack
Tue -- 05:57 AM PST     Moonset
Tue -- 07:24 AM PST     -0.53 knots Max Ebb
Tue -- 07:46 AM PST     Sunrise
Tue -- 10:48 AM PST     0.00 knots Slack
Tue -- 12:10 PM PST     0.25 knots Max Flood
Tue -- 02:40 PM PST     -0.00 knots Slack
Tue -- 03:38 PM PST     Moonrise
Tue -- 04:18 PM PST     Sunset
Tue -- 06:57 PM PST     -1.04 knots Max Ebb
Tue -- 10:49 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.70.60.40.1-0.1-0.4-0.5-0.5-0.4-0.20.10.20.20.1-0.1-0.4-0.7-1-1-0.9-0.7-0.30.1

Weather Map
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wmap_P
GEOS Local Image of PacificNorthwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Seattle, WA (15,3,4,5)
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Ground Weather Radar Station Seattle/Tacoma, WA
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