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Marine Weather and Tides Snoqualmie, WA Version 3.4

NOTICE 8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it. 8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue. 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 6:58AM

Sunset 7:00PM

Friday September 25, 2020 5:39 AM PDT (12:39 UTC)

Moonrise 3:38PM

Moonset 12:00AM

Illumination 58%

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 Snoqualmie, WA

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Area Discussion for - Seattle, WA

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FXUS66 KSEW 251022 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 322 AM PDT Fri Sep 25 2020

SYNOPSIS. A damp close to the week is in store as a vigorous Pacific storm system brings widespread rain to the area today. Scattered showers will then continue through the first half of the weekend before a high amplitude ridge dries the area out from Sunday through most of next week.

SHORT TERM /TODAY THROUGH SUNDAY/. The synoptic pattern this morning is characterized by strong polar jet oriented within a zonal flow regime across much of the far N Pacific, separating low pressure to its north over the Gulf of Alaska & thru the Bering Sea and high pressure to its south across subtropical latitudes. At the surface, a well defined frontal boundary was noted just offshore the Pacific Northwest, with warm frontal portion of the boundary beginning to move onshore and cold front still trailing over the offshore waters.

Around 230AM this morning, local radar imagery was picking up on an expansive area of stratiform rain across the Olympic Peninsula and across the Coastal Waters, associated with the warm frontal boundary and some PVA supplied by a nearby vort max lagging just behind the frontal boundary, per SPC mesoanalysis. Precipitation amounts across these areas thus far appear to be generally between 0.10-0.30 inches.

Going forward through the morning hours, a combination of favorable jet dynamics, height falls, and plenty of WAA in and around the vicinity of the warm frontal boundary and in the warm sector of the front will sustain the large shield of stratiform rain as it continues to spread inland, with just about the entire CWA experiencing light to moderate rainfall by daybreak. As the rain shield spreads inland, it will be accompanied by a strong LLJ between 925-850mb which will also translate to breezy to locally windy conditions at the surface. In general, expect highest winds to be confined more towards the Coast and the NW Interior (W Whatcom/Skagit Counties and thru the San Juan Islands and into Admiralty Inlet vicinity) where peak gusts may reach 45-50 mph. Elsewhere will be quite breezy with gusts 30-40 mph. Cannot rule out a few isolated areas reaching wind advisory criteria outside of the locations already mentioned, but in general think most areas will fall short. By the afternoon hours, bulk of the stratiform rain will push into the Cascades and east, with widely scattered showers picking up in the front's wake. Provided widespread cloud cover, widespread precip early in the day, and meager mid level lapse rates, do not anticipate thunderstorm development this afternoon/evening. As winds then turn more westerly in the wake of the front this evening, a good push down the Strait may be enough to generate a PSCZ over Snohomish County later this evening. Overall rainfall totals through tonight are expected to range from another 2-4 inches across the mountains to between 0.5-1 inch across the lowlands (could be locally higher). At current time does not appear to be enough for river flooding, tho do expect the potential for ponding on roadways and in areas of poor drainage- very similar to this past Wednesday's system.

Quasi-zonal mid/upper level flow will follow us into weekend, with a weak shortwave skirting the BC/WA border late in the day on Saturday. Will likely see continued shower activity into Saturday morning as W WA remains on the cyclonic side of the jet, with an enhancement in coverage through the afternoon as the shortwave approaches. All in all, Saturday will not be nearly as wet as Friday. Finally by Sunday, high pressure to the south of the polar jet over the far E Pacific and into California will build north, essentially pushing the storm track to our north. Guidance has continued to trend drier and so have opted to eliminate POPs for Sunday.

Kovacik

LONG TERM /MONDAY THROUGH THURSDAY/. The long term portion of the forecast will be dominated by a high amplitude pattern over the CONUS characterized by a Western US ridge and an Eastern US trough. This will imply a dry forecast for W WA through next week, with temps warming back into the 70s. The low level flow is expected to turn offshore during this timeframe, but given recent soaking rains, do not anticipate any fire weather issues. Also, given the time of year and the recent rains/residual low level moisture, could be beginning to look at the potential for morning fog, afternoon sun. All in all a rather tranquil extended appears to be in store.

Kovacik

AVIATION. A strong frontal system will move through the area today with west to southwest flow aloft. Westerly flow aloft will continue tonight. At the surface, southeasterly flow will turn westerly behind the front this afternoon. The air mass will be stable. Low clouds will become widespread this morning as the front moves through with visibilities reduced in rain. Ceilings and visibilities will improve this afternoon and evening behind the front with lower ceilings mainly in showers. A Puget Sound Convergence Zone is likely behind the front this afternoon and early evening.

KSEA . Ceilings will lower this morning with low clouds and reduced visibilities in rain developing. Ceilings should lift behind the front this afternoon and evening with decreasing showers. Southeast wind 5-10 knots will become south 10-20 knots with higher gusts this morning. Schneider

MARINE. A vigorous frontal system will bring gale force winds to much of the area this morning with winds easing this afternoon and evening. There will also be a brief strong westerly push down the Strait of Juan de Fuca this afternoon - perhaps an hour or two of gale force winds. A couple of much weaker weather systems will move through the area this weekend with light onshore flow. Offshore flow will develop early next week as a thermal trough builds north into the Coastal Waters. Schneider



HYDROLOGY. Another atmospheric river event will affect W WA today. As of 230AM, widespread rain was pushing into the Olympics and offshore waters. This area of rain will continue inland and provide for another round of soaking rain across the entire local area. By the afternoon, most of the widespread rain will be pushing east of the Cascades, giving way to continued showers through the remainder of the day. Overall rainfall amounts will range from 2-4 inches across the mountains and a 0.5-1 inch over the lowlands. River flooding is not expected, however, there could be some localized ponding of water on roadways and in areas of poor drainage.

Kovacik

SEW WATCHES/WARNINGS/ADVISORIES. WA . Wind Advisory until 10 AM PDT this morning for Central Coast- North Coast-San Juan County-Western Skagit County-Western Whatcom County.

High Surf Advisory until 2 PM PDT this afternoon for Central Coast-North Coast.

PZ . Small Craft Advisory until 11 AM PDT Saturday for Grays Harbor Bar.

Small Craft Advisory from 11 AM this morning to 11 AM PDT Saturday 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 until 11 AM PDT this morning 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-East Entrance U.S. Waters Strait Of Juan De Fuca-Northern Inland Waters Including The San Juan Islands.

Small Craft Advisory from 11 AM this morning to 11 PM PDT this evening for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 11 AM this morning to 6 PM PDT this evening for Northern Inland Waters Including The San Juan Islands.

Small Craft Advisory until 5 AM PDT Saturday for West Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory until 6 PM PDT this evening for Admiralty Inlet-Puget Sound and Hood Canal.



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	33 mi	39 min	S 18 G 19	56°F			1007.1 hPa (-3.1)	53°F
46120	34 mi	43 min	SSE 9.7	59°F			1006.4 hPa	52°F
TCMW1 - 9446482 - Tacoma Met, WA	35 mi	51 min	SE 5.1 G 7
TCNW1 - 9446484 - Tacoma, WA	35 mi	51 min		58°F	55°F		1008.4 hPa
46125	49 mi	45 min		57°F			1005 hPa	53°F

Wind History for Seattle, Puget Sound, WA, WA

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Renton Municipal Airport, WA	20 mi	46 min	Var 4	8.00 mi	Light Rain	56°F	51°F	84%	1008.4 hPa
Boeing Field - King County International Airport, WA	24 mi	46 min	SE 8	10.00 mi	Light Rain	57°F	52°F	83%	1007.6 hPa

Link to 5 minute data for KRNT

Wind History from RNT (wind in knots)

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Tide / Current Tables for Duwamish Waterway, Washington

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Tide / Current Tables for Des Moines, Washington

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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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Ground Weather Radar Station Seattle/Tacoma, WA

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