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Marine Weather and Tides Mercer Island, 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.

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Sunrise 5:49AM

Sunset 8:40PM

Tuesday August 4, 2020 6:26 AM PDT (13:26 UTC)

Moonrise 8:42PM

Moonset 5:41AM

Illumination 100%

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.

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7 Day Forecast for Marine Location Near Mercer Island, WA

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Area Discussion for - Seattle, WA

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FXUS66 KSEW 040949 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 249 AM PDT Tue Aug 4 2020

SYNOPSIS. A short return to upper level high pressure is in store for today and Wednesday ahead of the next low pressure system to arrive on Thursday. Dry and seasonably warm temperatures expected today and Wednesday.

SHORT TERM /TODAY THROUGH THURSDAY/. High pressure centered over eastern ID/MT with light onshore flow will keep things dry and seasonably normal today and Wednesday before the next system arrives on Thursday. Temperatures will be in the upper 70s with low 80s in spots throughout the interior with cooler 60s along the coast.

Widespread PoPs over the CWA associated with Thursday's system, but generally not a lot of rain accumulation expected. The forecast came in a little too vigorous on thunder chances this morning and after reviewing some of the hi-res models, it would appear that the dynamics and sufficient instability are just not in place to support it at this time. As such, the chances were significantly tampered down in this morning's forecast. The best chance for thunder is probably on the east side of the Cascades but will warrant additional monitoring.

Unlike the last low pressure system to move through the area, Thursday's system is expected to bring the temperatures down into the low 70s and upper 60s in the interior. This will be a refreshing exchange of cooler air for those prefer something a bit more moderate temperature wise.

LONG TERM /FRIDAY THROUGH MONDAY/. Now for the great extended range model debate . the GFS wants to keep some light shower activity in the forecast into Friday with a weak system falling apart on Saturday as it reaches the coast. After that, the GFS builds another ridge into the area, keeping things dry and warm into early next week. On the other hand, the ECMWF would like to keep it unsettled through the weekend, without developing the early-week ridge. As of now, the forecast has temperatures in the upper 70s to low 80s with 60s along the coast.

Kristell

AVIATION. Onshore flow will bring marine stratus clouds inland this morning with IFR to MVFR ceilings possible. The stratus clouds will burn back toward the coast this afternoon with VFR conditions in the interior. Low clouds will return overnight. 33

KSEA . Patchy low clouds and IFR cigs possible this morning, then becoming VFR this afternoon. N winds to 10 kt. 33

MARINE. Onshore flow will continue today and Wednesday. Highest wind and waves will be found through the Strait of Juan de Fuca - Small Craft Advisory winds are likely. Onshore flow will increase on Thursday as a cold front moves inland. A second, weaker, front will arrive on Friday. Onshore flow will continue into the weekend. 33

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 from 6 PM this evening to 8 AM PDT Wednesday for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca.



www.weather.gov/seattle

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
WPOW1 - West Point, WA	13 mi	146 min	NE 2.9 G 2.9	58°F			1019.9 hPa	58°F
46120	17 mi	34 min	Calm	57°F			1018.5 hPa	56°F
TCMW1 - 9446482 - Tacoma Met, WA	20 mi	56 min	NW 2.9 G 2.9
TCNW1 - 9446484 - Tacoma, WA	21 mi	56 min		61°F	56°F		1020 hPa
46121	31 mi	35 min	1.9	61°F			1019.4 hPa	59°F
46125	32 mi	35 min		55°F			1018.7 hPa	55°F
PTWW1 - 9444900 - Port Townsend, WA	48 mi	56 min	WSW 1.9 G 4.1	59°F	52°F		1020.1 hPa

Wind History for Seattle, Puget Sound, WA, WA

(wind in knots)    EDIT      (on/off)   Help

Last 24hr

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2 days ago

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Boeing Field - King County International Airport, WA	2 mi	33 min	WNW 3	10.00 mi	A Few Clouds	62°F	55°F	80%	1019.4 hPa
Renton Municipal Airport, WA	3 mi	33 min	N 3	7.00 mi	Fair	64°F	55°F	75%	1019.8 hPa
Seattle, Seattle-Tacoma International Airport, WA	7 mi	33 min	N 0	10.00 mi	A Few Clouds	62°F	57°F	84%	1020.1 hPa

Link to 5 minute data for KBFI

Wind History from BFI (wind in knots)

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Tide / Current Tables for Duwamish Waterway, Washington

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Tide / Current Tables for Restoration Point, 0.6 miles ESE of, Washington Current

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Weather Map

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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

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Wind Forecast for Seattle, WA (9,2,3,4)

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Ground Weather Radar Station Seattle/Tacoma, WA

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