Monday, January27, 2020
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Marine Weather and Tides
Seattle, 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 7:40AMSunset 5:03PM Monday January 27, 2020 8:37 AM PST (16:37 UTC) Moonrise 9:30AMMoonset 8:03PM Illumination 7% Phase: Waxing Crescent; Moon at 3 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- 754 Am Pst Mon Jan 27 2020
Today..S wind 5 to 15 kt. Wind waves 2 ft or less. A chance of showers in the morning then showers likely in the afternoon.
Tonight..Variable wind 5 to 15 kt becoming S 10 to 20 kt after midnight. Wind waves 1 to 3 ft. Rain in the evening then rain likely after midnight.
Tue..S wind 10 to 20 kt becoming 5 to 15 kt in the afternoon. Wind waves 1 to 3 ft. Showers likely in the morning then a chance of showers in the afternoon.
Tue night..S wind 5 to 15 kt rising to 15 to 25 kt after midnight. Wind waves 2 ft or less building to 2 to 4 ft after midnight.
Wed..S wind 10 to 20 kt. Wind waves 1 to 3 ft.
Wed night..S wind to 10 kt. Wind waves 1 ft or less.
Thu..S wind 5 to 15 kt. Wind waves 2 ft or less.
Fri..S wind 5 to 15 kt. Wind waves 2 ft or less.
PZZ100 754 Am Pst Mon Jan 27 2020
Synopsis for the northern and central washington coastal and inland waters..A series of systems will move through the waters this week. Headlines will be needed from time to time.


7 Day Forecast for Marine Location Near Seattle, WA
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location: 47.68, -122.41     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 271119 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 330 AM PST Mon Jan 27 2020

SYNOPSIS. Some lingering showers today before the next front arrives this evening. A low pressure system will weaken over the area on Tuesday. Another front will arrive Thursday - and yet another frontal system will slowly drag through the area for the end of the week.

SHORT TERM /TODAY THROUGH WEDNESDAY/. Some lingering showers over W WA this early morning . and those being pretty spread out . so all things considered . a relatively quiet start to this Monday compared to recent memory. Temperatures over the area are generally in the lower to mid 40s and snow levels look to be right around pass level or just a bit below.

These generally benign conditions are expected to persist into the afternoon as an upper level ridge tries to exert at least a meager influence over the area This. as one would expect for this pattern . will be short lived as the next system of consequence will be a surface low pushing into the area bringing the next round of rain to the area. This system will actually warm things up some with snow levels rising with its approach before falling again overnight. This might prove to be an offsetting factor in the mountains . where current forecast progs are actually bringing in higher moisture values At this time. given that current solutions seem to be higher than other runs . not sold on the prospect of any headlines needed for the west slopes of the Cascades at this time . but will pass on to next shift that it is a situation worth monitoring. To switch gears and focus on the lowlands . rainfall amounts in the evening might get heavy at times over the Olympic Peninsula. Also . it goes without saying that this additional rainfall will also keep the landslide threat going over W WA.

The initial front moves out overnight but is followed quickly by the associated upper level low . so no real break in the action is expected throughout much of Tuesday. Will start to see activity taper off into showers by late afternoon/early evening. An upper level ridge will attempt to dry out conditions overnight.

Wednesday morning sees the next front make its way to the coast and this looks to push inland by the afternoon. This front does not really linger though . although models disagree on how quickly. The GFS has it bolting out of the area with dry conditions kicking in by around 10 PM Wednesday evening while the ECMWF keeps precip in the area during the overnight before drying things out early Thursday morning. 18

LONG TERM /THURSDAY THROUGH SUNDAY/. Thursday sees some actual ridging over the area and mostly dry conditions. In a bit of role reversal . it is the GFS that is quick to bring in the following system with precip returning Thursday evening while the ECMWF does not really bring rain back to the area until Thursday night. It is during this time frame that models once again start to display the formation of an atmospheric river scenario . and once again it is the ECMWF that illustrates it much better . with the GFS having a hard time pulling it together However. both models do agree that while W WA might be in the path of the fire hose Friday . an upper level ridge to the south looks to actually push the feature north into Canada. Given this is the first appearance of this solution . not sure how much stock to give it just yet. Saturday sees the models split again with the GFS keeping the feature to the north before moving the ridge axis east and letting precip return more on Sunday. The ECMWF weakens the ridge and brings a return of wetter conditions a day earlier . with precip returning Saturday and sinking south throughout the day . potentially hinting at a break Saturday night into Sunday. Both models are suggesting cooler . potentially more wintry . conditions returning to the area late in the weekend . but given the discrepancies already described combined with the day 7-8 time frame . hard to take them seriously at this time. 18

AVIATION. Westerly flow aloft becoming southwesterly tonight as next weather system moves through the area. Upper level trough crossing the area Tuesday morning. Wide variety of ceilings this morning. In general ceilings in the 3500-5000 foot range with ceilings near 2000 feet in the vicinity of showers. Shower activity will come to an end by 16z. Rain spreading into the area this afternoon with ceilings between 3500-5000 feet into the evening hours. Isolated visibility 3-5sm with the rain.

KSEA . Ceilings near 4000 feet lowering at times to near 2500 feet with showers until 16z. Rain beginning around 21z and continuing into the evening hours with little change in the ceilings ( near 4000 feet ). Southerly winds 10 to 15 knots easing after 16z then becoming east southeasterly mid afternoon into the evening hours. Felton

MARINE. Another frontal system will move through the waters tonight with gale force winds over the coastal waters ahead of the front this afternoon into this evening. Small craft advisory winds over most of the remainder of the waters tonight with the front. A 1005 mb low will weaken and dissipate over the coastal waters Tuesday morning. A temporary ridge of high pressure will move through the waters Tuesday afternoon and evening. A pair of fronts will move across the waters Wednesday through Friday for another round of small craft advisory winds for a majority of the waters. Felton

HYDROLOGY. With the exception of the Skokomish river, flooding is not expected through Thursday. The Skokomish will remain above flood stage through the week. A possible atmospheric river scenario could set up beginning later Thursday and continue into Saturday. This event has the potential to create another round of flooding on area rivers. Felton

SEW WATCHES/WARNINGS/ADVISORIES. WA . None. PZ . Small Craft Advisory until 1 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.

Gale Warning from 1 PM this afternoon to 10 PM PST this evening 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 10 AM PST Tuesday for Grays Harbor Bar.

Small Craft Advisory from 6 PM this evening to 6 AM PST Tuesday for Admiralty Inlet-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 Tuesday for West Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 6 PM this evening to midnight PST tonight for Central U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory until 6 AM PST early this morning for Puget Sound and Hood Canal.



www.weather.gov/seattle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WPOW1 - West Point, WA 2 mi38 min S 18 G 19 46°F 1021.8 hPa (+1.6)44°F
TCMW1 - 9446482 - Tacoma Met, WA 28 mi68 min WSW 4.1 G 5.1
TCNW1 - 9446484 - Tacoma, WA 29 mi56 min 44°F 50°F1022.7 hPa

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boeing Field - King County International Airport, WA12 mi45 minSE 710.00 miMostly Cloudy42°F39°F89%1022.2 hPa
Renton Municipal Airport, WA16 mi45 minN 010.00 miMostly Cloudy42°F39°F89%1022.8 hPa
Everett Snohomish County, WA17 mi45 minS 910.00 miPartly Cloudy43°F37°F82%1021.5 hPa
Seattle, Seattle-Tacoma International Airport, WA17 mi45 minS 1010.00 miLight Rain43°F39°F89%1022.7 hPa
Bremerton, Bremerton National Airport, WA24 mi42 minWSW 610.00 miLight Rain42°F42°F100%1022.5 hPa

Link to 5 minute data for KBFI

Wind History from BFI (wind in knots)
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Tide / Current Tables for Meadow Point, Shilshole Bay, Washington
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Meadow Point
Click for Map
Mon -- 07:19 AM PST     12.08 feet High Tide
Mon -- 07:43 AM PST     Sunrise
Mon -- 09:29 AM PST     Moonrise
Mon -- 12:55 PM PST     6.07 feet Low Tide
Mon -- 05:02 PM PST     Sunset
Mon -- 05:48 PM PST     9.50 feet High Tide
Mon -- 08:03 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.60.11.94.37.19.511.21211.910.99.37.66.46.16.57.48.49.39.58.97.65.83.61.6

Tide / Current Tables for Alki Point, 0.3 miles W of, Washington Current
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Alki Point
Click for Map
Mon -- 12:24 AM PST     0.01 knots Slack
Mon -- 03:26 AM PST     0.78 knots Max Flood
Mon -- 07:15 AM PST     -0.00 knots Slack
Mon -- 07:43 AM PST     Sunrise
Mon -- 09:29 AM PST     Moonrise
Mon -- 09:59 AM PST     -0.45 knots Max Ebb
Mon -- 01:50 PM PST     0.00 knots Slack
Mon -- 03:24 PM PST     0.18 knots Max Flood
Mon -- 05:02 PM PST     Sunset
Mon -- 05:34 PM PST     -0.00 knots Slack
Mon -- 08:03 PM PST     Moonset
Mon -- 09:21 PM PST     -0.57 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.10.20.60.80.80.60.40.1-0.2-0.4-0.5-0.4-0.3-0.100.20.20.1-0.1-0.3-0.5-0.6-0.5-0.4

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 (11,2,3,4)
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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.