Thursday, February20, 2020
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Marine Weather and Tides
SeaTac, WA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 7:04AMSunset 5:41PM Thursday February 20, 2020 3:27 PM PST (23:27 UTC) Moonrise 5:55AMMoonset 2:40PM Illumination 8% Phase: Waning Crescent; Moon at 27 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- 140 Pm Pst Thu Feb 20 2020
Tonight..N wind to 10 kt becoming S after midnight. Wind waves 1 ft or less.
Fri..S wind to 10 kt. Wind waves 1 ft or less in the morning becoming less than 1 ft.
Fri night..NW wind to 10 kt becoming S after midnight. Wind waves 1 ft or less.
Sat..S wind to 10 kt. Wind waves 1 ft or less.
Sat night..Light wind. Wind waves less than 1 ft.
Sun..S wind to 10 kt rising to 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Sun night..SW wind 5 to 15 kt becoming to 10 kt after midnight. Wind waves 2 ft or less.
Mon..SW wind to 10 kt becoming light. Wind waves 1 ft or less.
Tue..Light wind. Wind waves less than 1 ft.
PZZ100 140 Pm Pst Thu Feb 20 2020
Synopsis for the northern and central washington coastal and inland waters..Light offshore flow will continue through Friday morning before giving way to light onshore flow during the day. A weakening front will move through the area Saturday, with a second front moving through the area Sunday into Sunday night. The second front will yield increasing winds and seas, with the potential for strong winds spreading from the nearshore waters into the strait of juan de fuca on Sunday.


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 202222 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 222 PM PST Thu Feb 20 2020

SYNOPSIS. Dry conditions will persist into Friday. A weak front may bring a few light showers on Saturday, with a more robust system expected for Sunday. This system will bring lowland rain and mountain snow to the area, which will linger into Monday. Dry conditions return for Tuesday and last through mid-week.

SHORT TERM /TONIGHT THROUGH SUNDAY/. High pressure and offshore flow continues across western WA today for dry and mild weather. Skies are mostly clear this afternoon with temperatures in the 50s. Temperatures will be chilly overnight under clear skies and light winds. Expect lows in the 20s to lower 30s once again.

The ridge will exits east on Friday while the flow aloft becomes more westerly or zonal. A weak system moving into B.C. will spread high clouds into western WA. Otherwise, we'll see one more dry and mild day across the region.

Rain returns late Friday night into Saturday as a weak frontal system clips western WA. Overall, precipitation amounts look light and most areas will see less than 0.10" through the period.

A stronger and wetter Pacific frontal system is slated for Sunday. This system will bring more rain, gusty winds and possibly heavy mountain snow to the area. Snow levels will remain low, around 3000 ft, with accumulating snow expected at the higher passes (like Stevens and White Pass). Snoqualmie Pass may see a rain/snow mix. Winds will be gusty (out of the S/SW) as the cold front moves through the interior Sunday afternoon - gusts to 40 mph possible. Showers will mostly impact the Cascades Sunday night under post-frontal onshore flow. Will likely see a convergence zone develop which may bring more heavy snow to Stevens Pass. 33

LONG TERM /MONDAY THROUGH THURSDAY/. Showers will linger into Monday as onshore flow continues. An upper level ridge will build inland on Tuesday for a break in the pattern. The ridge may flatten over the Pac NW on Wednesday as a weak front clips the region. High pressure will rebuild late in the week, putting us back in a relatively quiet period of weather. 33

AVIATION. VFR conditions with generally light and variable winds at nearly all TAF sites. HQM continues to have east-southeasterly prevailing winds around 10 knots, with the latest metar reporting 3SM due to haze at this hour. Otherwise, fog is expected to develop at and around OLM overnight.

KSEA . VFR conditions with winds currently out of the NW at 7kts. Winds are expected to weaken and shift back to an easterly direction ENE to ESE overnight before becoming southerly after daybreak. Speeds below 7kts expected. Increasing high clouds AOA 25k ft Friday.

Pullin

MARINE. Light offshore flow will continue through Friday morning before giving way to light onshore flow during the day. A weakening front will move through the area Saturday, with a second front moving through the area Sunday into Sunday night. The second front will yield increasing winds and seas, with the potential for strong winds spreading from the nearshore waters into the Strait of Juan de Fuca on Sunday.

Pullin

HYDROLOGY. River flooding is not expected over the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES. WA . None. PZ . None.

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 mi57 min WNW 5.1 G 5.1
TCNW1 - 9446484 - Tacoma, WA 13 mi57 min 1023.7 hPa
WPOW1 - West Point, WA 19 mi87 min NNE 5.1 G 5.1 46°F 1023.8 hPa (-1.3)34°F
46121 26 mi28 min 1.9 49°F 1023.3 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 mi34 minNW 410.00 miPartly Cloudy56°F28°F34%1023.8 hPa
Renton Municipal Airport, WA6 mi34 minNNW 710.00 miFair55°F28°F37%1023.4 hPa
Boeing Field - King County International Airport, WA8 mi34 minNNW 610.00 miA Few Clouds55°F25°F31%1023.2 hPa
Tacoma, Tacoma Narrows Airport, WA19 mi34 minN 010.00 miFair53°F28°F40%1023.6 hPa
Tacoma / McChord Air Force Base, WA21 mi29 minW 310.00 miFair56°F25°F31%1023.6 hPa
Pierce County-Thun Field, WA22 mi52 minN 010.00 miFair59°F23°F25%1023 hPa

Link to 5 minute data for KSEA

Wind History from SEA (wind in knots)
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Last 24hrNW4NE3E6E11E14E12E11E12E8SE5SE13E9E9E9E8E6E6E7E9E6W5NW7W6NW4
1 day agoN13N12N9N8N13N9N11N12N9N8N10N6N7N9N5NE6NE7NE5NE5NE4CalmNW7NW6NW6
2 days agoCalmN7NE7NE6NE5NE5E3E3N5E4SE5CalmE4NE4NE3CalmNE5N4N4N10N13N14N9NW10

Tide / Current Tables for Des Moines, Washington
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Des Moines
Click for Map
Thu -- 04:10 AM PST     11.91 feet High Tide
Thu -- 05:54 AM PST     Moonrise
Thu -- 07:06 AM PST     Sunrise
Thu -- 09:31 AM PST     7.25 feet Low Tide
Thu -- 02:05 PM PST     10.26 feet High Tide
Thu -- 02:40 PM PST     Moonset
Thu -- 05:40 PM PST     Sunset
Thu -- 09:22 PM PST     -0.58 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.17.79.811.311.911.610.59.287.37.37.98.99.810.3108.97.24.92.50.5-0.5-0.31

Tide / Current Tables for Skagit Bay, 1 mile N of Rocky Point, Washington Current
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Skagit Bay
Click for Map
Thu -- 01:32 AM PST     0.97 knots Max Flood
Thu -- 04:02 AM PST     -0.00 knots Slack
Thu -- 05:55 AM PST     Moonrise
Thu -- 07:07 AM PST     Sunrise
Thu -- 08:50 AM PST     -0.73 knots Max Ebb
Thu -- 10:38 AM PST     0.00 knots Slack
Thu -- 01:15 PM PST     0.22 knots Max Flood
Thu -- 01:54 PM PST     -0.00 knots Slack
Thu -- 02:41 PM PST     Moonset
Thu -- 05:40 PM PST     Sunset
Thu -- 08:14 PM PST     -1.29 knots Max Ebb
Thu -- 10:12 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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0.80.90.90.60-0.2-0.5-0.6-0.7-0.7-0.30.10.20.2-0-0.2-0.5-0.8-1-1.2-1.3-1.1-0.20.3

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 (18,4,5,8)
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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 numerous 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.