Tuesday, July14, 2020
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Marine Weather and Tides
Des Moines, 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 5:25AMSunset 9:05PM Monday July 13, 2020 10:56 PM PDT (05:56 UTC) Moonrise 12:01AMMoonset 1:20PM Illumination 36% Phase: Third Quarter Moon; Moon at 23 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- 629 Pm Pdt Mon Jul 13 2020
Tonight..NE wind 5 to 15 kt. Wind waves 2 ft or less.
Tue..N wind to 10 kt. Wind waves 1 ft or less.
Tue night..N wind 5 to 15 kt becoming ne after midnight. Wind waves 2 ft or less.
Wed..Light wind becoming nw to 10 kt in the afternoon. Wind waves 1 ft or less.
Wed night..N wind 5 to 15 kt becoming ne after midnight. Wind waves 2 ft or less.
Thu..Light wind becoming sw to 10 kt in the afternoon. Wind waves 1 ft or less.
Thu night..Light wind. Wind waves less than 1 ft.
Fri..Light wind becoming nw to 10 kt. Wind waves 1 ft or less.
Sat..Light wind becoming nw to 10 kt. Wind waves 1 ft or less.
PZZ100 629 Pm Pdt Mon Jul 13 2020
Synopsis for the northern and central washington coastal and inland waters..Onshore flow will remain in place through the week with high pressure remaining well offshore and lower pressure inland.


7 Day Forecast for Marine Location Near Des Moines, WA
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location: 47.39, -122.35     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 140330 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 830 PM PDT Mon Jul 13 2020

UPDATE. Mostly clear skies across Western Washington this evening with high pressure over the area. Clear conditions for most through tonight with a few stratus developing along the coast into the morning.

SYNOPSIS. High pressure will allow for drier, warmer conditions across the area through mid-week with Wednesday likely being the warmest day of the week. A weak frontal system will brush the area Thursday and Friday, carrying a few showers across the area during its passage. A blocking pattern over the Pacific will develop over the weekend, with ridge portion expected hold some influence over the area allowing for another drying and warming trend.

SHORT TERM /TONIGHT THROUGH THURSDAY/. A tranquil short term forecast period is in store across the CWA. Water vapor imagery this afternoon depicts an expansive mid/upper level anticyclone across the North Pacific, with a large area of low pressure centered over NW Saskatchewan and extending south into the Northern Rockies. This places the Pacific Northwest in NW flow aloft between these two features. At the surface, high pressure is in control as surface reflection of the upper anticyclone remains anchored across the North Pacific.

The above analysis makes it clear (no pun intended) why the local area is enjoying a mostly sunny day today. Although there is evidence of some embedded vorticity within the H5 NW flow, it has done nothing more than advect a few mid and high clouds across the area at times today, with many of these dissipating with lack of deep layer moisture. Seeing the development of diurnal cumulus across portions of the area too provided abundant sunshine, especially near the higher terrain. These conditions will persist towards sunset, with highs topping off in the 70s most lowlands (60s near water).

Mostly clear skies expected overnight, with the exception of the Coast where onshore flow (given continued high pressure over the Pacific) will likely yield the development of some stratus. Do not expect this layer to penetrate past the immediate coast into Tuesday morning. There will be a better mid/upper level ridge influence through Tuesday, with high pressure continuing to dominate the low levels. Tuesday temps will be several degrees warmer under mostly sunny skies as a result of this pattern.

By Wednesday, the upper ridge will dampen as stronger belt of westerly flow ejects eastward just south of the Gulf of Alaska. After another round of marine stratus along the Coast (likely pushing a tad further inland than Tuesday morning), and potentially down the Strait and into the Northern Sound, should begin to see higher level cloud cover increase by late in the day. Embedded within the aforementioned westerly flow will be a mid level shortwave with an associated sfc frontal boundary, both making progress towards the area through the day. Nevertheless, Wednesday still appears to be the warmest day of the week, especially if cloud cover increases late, with highs in the low 80s lowlands (upper 60s-near 70 around water). Clouds should encompass much of the area by Thursday morning, with the chance for showers increasing through the day from west to east. Rainfall will not amount to much but will likely linger into the long term forecast period.

Kovacik

LONG TERM /FRIDAY THROUGH MONDAY/. The short wave and the frontal system passing through the area at the end of the short term will be exiting the area by Friday morning. Residual troughing will likely to set up in its wake with some lingering showers expected, especially across higher terrain and east of Puget Sound. Conditions will become drier overnight Friday.

By the weekend, ensemble guidance and deterministic guidance suggest the development of a Rex block over the North Pacific. The question will be how quickly and to what extend the ridge portion of this block will build into the PNW region. Ensemble means and WPC cluster analysis are currently suggestive of the best influence remaining just offshore and northward towards southern Alaska. This would essentially place western Washington in a NW flow aloft pattern, with still some ridge influence, which currently appears dry. This pattern appears retrogressive into early next week, with the blocking feature retreating to the west a bit. Even in this scenario, it appears the main storm track with remain to our north as western Washington attempts to hold on to some ridge influence. Will opt to keep the extended mostly dry from the weekend onward, with perhaps an even greater warm up than this week with mid 80s possible across some lowland locations by Monday (and mid 70s by water).

Kovacik

AVIATION. Northwesterly flow aloft with an upper level ridge offshore of the area. VFR cigs with a few high clouds around this evening. VFR tonight with MVFR/IFR possible along the coast in the early morning (12z-17z). VFR on Tuesday. North winds 5 to 10 knots through tonight.

KSEA . VFR cigs. North winds this evening with northeast winds tonight. North winds for Tuesday 4 to 8 knots. JD

MARINE. Onshore flow tonight. Small Craft Advisory for portions of the coastal waters and central and eastern portions of the Strait of Juan de Fuca through tonight. Onshore flow through this week with SCA winds for the Strait of Juan de Fuca at times with increasing flow. JD

HYDROLOGY. The daily hydrology discussion has ended until the start of the next rainy season; it will only be updated as needed until then.

SEW WATCHES/WARNINGS/ADVISORIES. WA . None. PZ . Small Craft Advisory until 1 AM PDT Tuesday 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 5 AM PDT Tuesday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca.



www.weather.gov/seattle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCNW1 - 9446484 - Tacoma, WA 9 mi57 min 54°F
WPOW1 - West Point, WA 19 mi117 min NE 11 G 11 61°F 1019.4 hPa (+0.0)52°F
46121 22 mi44 min 1.9 64°F 1019.2 hPa51°F
46120 26 mi40 min N 5.8 60°F 1018.6 hPa51°F
46125 39 mi40 min 57°F 1018.8 hPa52°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, WA4 mi64 minN 810.00 miA Few Clouds64°F46°F52%1019.8 hPa
Boeing Field - King County International Airport, WA10 mi64 minVar 310.00 miFair66°F45°F47%1019 hPa
Renton Municipal Airport, WA10 mi64 minN 710.00 miFair65°F48°F56%1019.5 hPa
Tacoma, Tacoma Narrows Airport, WA15 mi64 minN 610.00 miFair64°F42°F45%1019.2 hPa
Tacoma / McChord Air Force Base, WA17 mi59 minN 010.00 miFair65°F41°F43%1019.6 hPa
Pierce County-Thun Field, WA20 mi62 minN 010.00 miFair57°F48°F72%1019.3 hPa
Bremerton, Bremerton National Airport, WA23 mi61 minNNE 810.00 miFair62°F46°F56%1019.8 hPa
Fort Lewis / Gray U. S. Army Airfield, WA24 mi59 minNNW 410.00 miFair66°F46°F49%1019.3 hPa

Link to 5 minute data for KSEA

Wind History from SEA (wind in knots)
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Last 24hrNE13NE13NE11N7NE8NE7N8N7N7N8CalmNW7W6W9NW9NW9
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1 day agoSE6S10S11S11S10S7S4SW5SW6SW8W6NW4N9N10N74NW6NW5W9N8N8NE12NE13NE16
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2 days agoN6N3NW4N7N5CalmW3CalmS3S4SW4S9SW9S9SW11SW13
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Tide / Current Tables for Des Moines, Washington
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Des Moines
Click for Map
Tue -- 12:15 AM PDT     10.87 feet High Tide
Tue -- 01:19 AM PDT     Moonrise
Tue -- 05:27 AM PDT     Sunrise
Tue -- 07:33 AM PDT     2.24 feet Low Tide
Tue -- 02:20 PM PDT     8.13 feet High Tide
Tue -- 03:24 PM PDT     Moonset
Tue -- 06:52 PM PDT     6.00 feet Low Tide
Tue -- 09:02 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.810.79.88.46.64.73.22.32.32.94.15.56.87.78.187.66.86.266.47.28.39.5

Tide / Current Tables for Skagit Bay, 1 mile S of Goat Island, Washington Current
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Skagit Bay
Click for Map
Tue -- 01:01 AM PDT     -1.30 knots Max Ebb
Tue -- 01:20 AM PDT     Moonrise
Tue -- 04:34 AM PDT     0.00 knots Slack
Tue -- 05:28 AM PDT     Sunrise
Tue -- 07:00 AM PDT     1.42 knots Max Flood
Tue -- 11:08 AM PDT     -0.00 knots Slack
Tue -- 01:30 PM PDT     -1.05 knots Max Ebb
Tue -- 03:24 PM PDT     Moonset
Tue -- 04:30 PM PDT     0.02 knots Slack
Tue -- 07:06 PM PDT     1.31 knots Max Flood
Tue -- 09:02 PM PDT     Sunset
Tue -- 10:35 PM PDT     -0.02 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.2-1.3-1.2-1-0.70.61.21.41.31.10.80.2-0.8-1-1-0.8-0.50.51.11.31.210.5-0.6

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Seattle, WA (1,6,7,8)
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Ground Weather Radar Station Seattle/Tacoma, WA
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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.