Sunday, March29, 2020
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Marine Weather and Tides
Snoqualmie, 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 6:49AMSunset 7:35PM Sunday March 29, 2020 10:46 AM PDT (17:46 UTC) Moonrise 8:32AMMoonset 12:00AM Illumination 31% Phase: Waxing Crescent; Moon at 6 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- 857 Am Pdt Sun Mar 29 2020
.small craft advisory in effect until 2 pm pdt this afternoon...
Today..S wind 15 to 25 kt. Wind waves 2 to 4 ft. Rain in the morning then a chance of rain in the afternoon.
Tonight..SW wind 15 to 25 kt becoming S 20 to 30 kt after midnight. Wind waves 2 to 5 ft. A chance of rain in the evening then rain after midnight.
Mon..SW wind 15 to 25 kt. Wind waves 2 to 4 ft. Rain likely. A slight chance of tstms in the afternoon.
Mon night..S wind 15 to 25 kt. Wind waves 2 to 4 ft.
Tue..S wind 20 to 30 kt becoming sw 15 to 25 kt in the afternoon. Wind waves 2 to 5 ft.
Tue night..SW wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Wed..Light wind. Wind waves less than 1 ft.
Thu..S wind to 10 kt becoming light. Wind waves 1 ft or less.
PZZ100 857 Am Pdt Sun Mar 29 2020
Synopsis for the northern and central washington coastal and inland waters..A stronger system will move through the region this evening, bringing likely gales to at least the coastal waters and portions of the inland waters. Seas remain elevated through mid- week with an arriving westerly swell, but winds will ease with high pressure returning to the region.


7 Day Forecast for Marine Location Near Snoqualmie, WA
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location: 47.53, -121.84     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 291626 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 926 AM PDT Sun Mar 29 2020

SYNOPSIS. An unsettled pattern will continue for much of the upcoming week. A weakening front will bring morning rain and afternoon showers to the area today, before a more organized system quickly brings the next round of widespread lowland rain and heavy mountain snow for much of Monday. Shower coverage will then gradually decrease through the day Tuesday, with the chance for a few showers each day through the remainder of the week.

UPDATE. The line of more widespread rain associated with the front continues to push into and east of the Cascades. Meanwhile, widespread shower activity continues across much of Western Washington in the unstable, post-frontal air mass. Given some cloud breaks already this morning and fairly steep low-level lapse rates, have added a slight chance mention of lightning to the forecast this afternoon for most of the region. While it is a somewhat low probability, there is enough support for a stronger shower to produce a strike or two. Otherwise, forecast remains on track and the previous short term discussion provides details concerning the next significant weather system tonight through Monday. Cullen

SHORT TERM /TODAY THROUGH TUESDAY/. Looping the early Sunday morning water vapor imagery depicts broad scale cyclonic flow that extends roughly from the Aleutian Islands south/southeastward through the northeastern Pacific and into the western US. Several distinct shortwave troughs are embedded within this larger scale flow, one of which is located just offshore the Pacific Northwest Coast and another, much stronger, shortwave in the Gulf of Alaska. At the surface, a weakening cold front was noted just offshore the Pacific Northwest Coast, associated with the aforementioned upper level shortwave offshore. This is the most significant lower level feature across the region, although a glance much further downstream reveals a very strong sfc cyclone and associated parent upper trough across the Midwest.

For today, the aforementioned weak upper level shortwave trough will traverse the local area, carrying with it the weakening cold frontal boundary at the surface. As per current radar imagery /10z/, widespread rain is located ahead and along the frontal boundary, and this precipitation will continue to spread east through the morning hours, leaving a marginally unstable environment in its wake. This should yield the development of post-frontal showers this afternoon, with the main mechanisms of forcing being diurnal heating and somewhat enhanced mid level lapse rates. Model guidance is suggestive of the development of a few hundred J/kg of MUCAPE this afternoon, which could potentially aid in the development of a lightning strike or two. Given that this is a possibility, have opted to keep slight chance of thunder in the forecast, though activity looks very isolated given marginal instability. Also, given the weakening sfc frontal boundary, will not see a noticeable drop in snow levels today (snow levels 2000-3000ft) so mountain snow accumulations are not expected to be impactful.

Things get a bit interesting beginning late this evening and into the overnight hours. Aforementioned Gulf of Alaska shortwave trough will have noticeably deepened (and can actually already currently see tight/strong jet dynamics on its upstream side, indicative of the potential for the trough to dig) through the day on Sunday and will begin to approach the local area tonight as it remains closed. A rather organized sfc frontal boundary will accompany this system and should begin to see a noticeable increase in radar returns/precip late this evening from the west. This system will push rather quickly across the area overnight tonight into Monday morning. As the front swings through the area, winds will briefly pick up across much of the area. Given the progressive nature of the system, have opted to omit any wind headlines, tho there could be the potential for some borderline advisory gusts across the usual spots, the Northwest Interior, the Coast, and Admiralty Inlet Area. The mountains will also pick up some snow with this round of precip, tho not sure how much the Passes will be affected-will depend on how quickly snow levels drop. Snow levels are expected to noticeably drop as the front plows through Monday morning- likely to between 1500-2500ft. Fairly widespread post-frontal shower activity is expected then through much of the day. With mid level temps dropping back down to below -30C, mid level lapse rates should be steeper and there could be a better chance for thunderstorm development. Also given this more convective regime, pockets of heavy snow will be possible across the mountainous terrain. Given the chance for decent snow accumulation across the mountains, have issued a Winter Storm Watch for the mountains tonight through Tuesday morning. Right now, amounts are borderline for warning criteria, so will let the next shift monitor additional data today. Rain in the lowlands will be widespread, especially overnight tonight through early Monday, with the potential for pockets of heavier rain within convective showers Monday afternoon/evening, bringing potential QPF to around a half inch to near an inch.

The potent closed shortwave trough will linger through Tuesday and keep the chance for nuisance lowland rain showers and mountain snow showers for much of the day. Overall QPF looks lower than Monday, so expect most of the impacts to be minimal at this point.

Kovacik

LONG TERM /WEDNESDAY THROUGH SATURDAY/. The shortwave trough axis finally pushes through the local area on Wednesday, however, the broader picture reveals longer wave cyclonic flow still encompassing the region, and another subtle shortwave is likely to push through. Showers will be possible again on Wednesday, though coverage looks to be less than that of the previous few days. We try to shake this pattern by Thursday, but not quite enough to prevent some showers from lingering or redeveloping. Friday looks similar to Thursday. Ensembles appear to struggle with the placement of broader scale troughing in our vicinity, as well as the strength of the upstream ridge late this week and into next weekend. For now will side more with the ECMWF and CMC ensembles, with argue for placement of the trough slightly further east of the local area. Will still keep slight chance for showers, but overall the latter half of the week is far from a washout.

Kovacik

AVIATION. Expect mostly MVFR ceilings through the period with local IFR to LIFR possible at times as heavier areas of rain develop this evening and tonight across the region. With clearing noted on satellite across the region this morning, the air mass is becoming somewhat unstable, so could see a thunderstorm or two this afternoon for areas across the southern interior. Southerly surface winds between 10-15 knots with locally more gusty conditions developing throughout the day. The uptick in winds is expected to continue into through the evening overnight hours as a more robust frontal system moves into the area.

KSEA . MVFR to low VFR ceilings likely to continue through most of the period with rounds of rain. Periods of IFR to LIFR conditions will be possible in any heavier bands that move in the vicinity of the terminal. A stronger frontal system will move into the area this evening, bringing stronger winds to the terminal. Winds remain predominantly southerly today, at 7-14 knots this morning, increasing to 20-25 knots by this evening. Kristell/Borth

MARINE. A brief lull in winds is expected this afternoon before a stronger, more organized frontal system moves through the region tonight and into Monday. With the air mass becoming somewhat unstable, could see a thunderstorm or two over area waters at times this afternoon ahead of the next system. The incoming system will yield a stronger surge of southerly winds across area waters tonight. Thus, a gale watch remains in effect for the coastal waters and northern inland waters/east entrance of the Strait for late this evening into early Monday. Winds will then subside behind the front, but seas will remain elevated over the coastal waters through the first portion of next week. Kristell/Borth

HYDROLOGY. No river flooding is expected through the next 7 days. While periods of heavy precipitation are expected in the next few days, snow levels will remain generally around 1,500 feet, which should preclude major hydrologic concerns. However, rises are expected on many rivers over the next few days.

SEW WATCHES/WARNINGS/ADVISORIES. WA . Winter Storm Watch from late tonight through Tuesday morning for Cascades of Pierce and Lewis Counties-Cascades of Snohomish and King Counties-Cascades of Whatcom and Skagit Counties.

Winter Storm Watch from 8 PM PDT this evening through late Monday night for Olympics.

PZ . Gale Watch from 7 PM PDT this evening through late tonight 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 Watch from this evening through Monday morning for East Entrance U.S. Waters Strait Of Juan De Fuca-Northern Inland Waters Including The San Juan Islands.

Small Craft Advisory until 2 PM PDT this afternoon for Admiralty Inlet-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 33 mi47 min S 21 G 24 48°F 1011.5 hPa (+1.3)45°F
46120 34 mi28 min S 9.7 48°F 1010.4 hPa43°F
TCMW1 - 9446482 - Tacoma Met, WA 35 mi47 min S 8 G 12
TCNW1 - 9446484 - Tacoma, WA 35 mi47 min 48°F 48°F1012.7 hPa (+0.7)
46125 49 mi34 min 48°F 1010.2 hPa42°F

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Renton Municipal Airport, WA20 mi54 minS 8 G 159.00 miOvercast46°F44°F93%1012.6 hPa
Boeing Field - King County International Airport, WA24 mi54 minS 10 G 1810.00 miMostly Cloudy50°F44°F80%1011.9 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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Duwamish Waterway
Click for Map
Sun -- 12:09 AM PDT     Moonset
Sun -- 02:53 AM PDT     5.27 feet Low Tide
Sun -- 06:52 AM PDT     Sunrise
Sun -- 08:07 AM PDT     9.83 feet High Tide
Sun -- 09:33 AM PDT     Moonrise
Sun -- 03:18 PM PDT     0.62 feet Low Tide
Sun -- 07:36 PM PDT     Sunset
Sun -- 10:12 PM PDT     9.67 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.76.55.65.35.86.98.29.39.89.58.56.84.931.50.70.92.1467.89.19.79.5

Tide / Current Tables for Des Moines, Washington
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Des Moines
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Sun -- 12:09 AM PDT     Moonset
Sun -- 02:50 AM PDT     5.60 feet Low Tide
Sun -- 06:52 AM PDT     Sunrise
Sun -- 08:11 AM PDT     10.44 feet High Tide
Sun -- 09:34 AM PDT     Moonrise
Sun -- 03:15 PM PDT     0.66 feet Low Tide
Sun -- 07:35 PM PDT     Sunset
Sun -- 10:16 PM PDT     10.27 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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8.26.95.95.66.27.48.79.910.410.297.35.23.21.50.712.34.26.38.39.610.210.1

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 (13,3,4,5)
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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.