Tuesday, July7, 2020
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Marine Weather and Tides
SeaTac, 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 5:19AMSunset 9:09PM Tuesday July 7, 2020 5:36 PM PDT (00:36 UTC) Moonrise 10:14PMMoonset 6:48AM Illumination 93% Phase: Waning Gibbous; Moon at 17 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- 302 Pm Pdt Tue Jul 7 2020
Tonight..NW wind to 10 kt becoming S after midnight. Wind waves 1 ft or less. A chance of rain.
Wed..S wind to 10 kt. Wind waves 1 ft or less. A chance of rain in the morning then a slight chance of rain in the afternoon.
Wed night..Variable wind to 10 kt becoming N after midnight. Wind waves 1 ft or less. A slight chance of rain in the evening then a chance of rain after midnight.
Thu..S wind to 10 kt becoming nw in the afternoon. Wind waves 1 ft or less.
Thu night..NW wind 5 to 15 kt becoming N after midnight. Wind waves 2 ft or less.
Fri..Light wind becoming N to 10 kt in the afternoon. Wind waves 1 ft or less.
Fri night..Light wind. Wind waves less than 1 ft.
Sat..SW wind to 10 kt. Wind waves 1 ft or less.
Sun..SW wind to 10 kt becoming nw. Wind waves 1 ft or less.
PZZ100 302 Pm Pdt Tue Jul 7 2020
Synopsis for the northern and central washington coastal and inland waters..Weak onshore flow will continue into the upcoming weekend as high pressure remains centered offshore.


7 Day Forecast for Marine Location Near SeaTac, WA
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location: 47.42, -122.28     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 072131 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 231 PM PDT Tue Jul 7 2020

SYNOPSIS. An upper-level disturbance continues to move across the region today, maintaining plenty of clouds and some showers. After a short break on Wednesday, additional disturbances will rotate across the region on Thursday and again over the weekend, maintaining cooler than normal conditions and a few rounds of precipitation through early next week.

SHORT TERM /TONIGHT THROUGH FRIDAY/. Latest satellite imagery depicts an upper trough axis aligned across the state this afternoon, with a persistent cloud deck and scattered showers. Per latest NWS radar imagery, most showers are organized either across the southern/western parts of the forecast area or in a region of developing convergence across the northern and central Puget Sound. Expect to see the atmosphere begin to dry out in the mid- levels later tonight and into Wednesday as a weak upper ridge of high pressure pushes into the region. This should bring showers largely to an end for most locations, though weak onshore flow will continue tonight and a lingering Puget Sound Convergence Zone may develop and persist through much of the night. Elsewhere, the weak onshore flow should serve to maintain a relatively solid lower cloud deck. For some areas that do begin to scatter out, there may be brief a window for localized fog to develop in the more favored locations toward daybreak, but many locations should instead maintain a more solid cloud deck. With the drying trend and weak onshore gradients into Wednesday, expect morning clouds to eventually give way to increasingly sunny skies by the afternoon. The slightly warmer air mass and decreasing sky cover should allow temperatures to rebound into the lower 70s for the interior lowlands.

However, the break in the weather looks be short-lived as the next upper trough quickly approaches Western Washington late Wednesday. Expect to see an increase in mid-level clouds streaming into the region by Wednesday evening, with some guidance indicating the leading edge of rain reaching the coast during the late afternoon or early evening hours, before advancing inland overnight and into early Thursday. This will likely yield another cool and damp day across the region on Thursday, with rain eventually tapering off from southwest to northeast later in the day. Much of the interior lowlands may be a bit shadowed in the predominantly southwesterly flow, but precipitation amounts up to around half an inch are possible in the more favored terrain of the Olympics and Cascades. Behind this system, another round of higher pressure and warmer temperatures looks likely for Friday with plenty of sun after morning clouds. Of course, the rather progressive weather pattern continues with yet another disturbance quickly following.

Cullen

LONG TERM /SATURDAY THROUGH TUESDAY/. The next weather system will then approach the region over the weekend. Current guidance suggests that this low pressure system may be a bit stronger and better organized that recent systems, with a slightly slower trend in recent model runs. However, there is a significant bit of spread in guidance, likely partially due to the potential influence of a strengthening ridge across the southwestern U.S. Nonetheless, the front is expected to push across Western Washington over the weekend with another round of increasing clouds and precipitation chances. Onshore flow then follows into early next week, with at least some chance of showers (especially across the higher terrain and near the coast), but flow aloft likely becomes more zonal with temperatures returning to near or slightly below normal values closer to midweek.

Cullen

AVIATION. Ceilings are in an attempt to recover to VFR this afternoon, with coverage still ranging from BKN-OVC. This will be the general trend into the overnight hours tonight, however, scattered showers will have the ability to pull ceilings temporarily back down to MVFR through the evening. With onshore flow continuing in the lower levels of the atmosphere, ceilings are expected to drop back to MVFR during the overnight and morning period tonight and Wednesday. Then, similar to today and Monday, ceilings will lift back to VFR and attempt to scatter out some. Winds will remain out the S for most sites at 8-12 kts thru the period, with the exception of W wind at HQM and CLM and a brief period of N wind at PAE this afternoon and evening.

KSEA . VFR ceilings at BKN-OVC into tonight with lowering back to MVFR early Wednesday morning before recovering back to VFR Wednesday afternoon. A few showers possible through this evening. Winds S/SE 8- 12kts.

Kovacik

MARINE. Onshore flow to continue through much of the upcoming forecast period as expansive anticyclone remains the dominant feature over the North Pacific. A passing weather system today has allowed for the development of scattered showers across area waters amidst benign wind and waves as gradients remain weak. In the wake of this passing system, a ridge will advect across the area through the day Wednesday, allowing for a generally drier day and continued light wind and benign wave activity. By late in the day, the next front will begin to bring rain to the offshore waters and perhaps western portions of the Strait. This front will then carry showers east with it through much of Thursday, allowing for another unsettled day. After another brief break on Friday, additional systems will affect the waters through the weekend. Overall, no marine headlines are anticipated in the coming days, with the Central and Eastern Strait hovering near small craft advisory level winds each evening/overnight period, but have opted to cap winds around 20kts provided weak gradients.

Seas will remain calm through the week at generally 2-5 feet.

Kovacik

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 . None.

www.weather.gov/seattle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 12 mi49 min WSW 8 G 11
TCNW1 - 9446484 - Tacoma, WA 13 mi49 min 68°F 54°F1019 hPa
WPOW1 - West Point, WA 19 mi37 min N 14 G 15 57°F 1019.3 hPa (+0.0)55°F
46120 24 mi28 min N 3.9 59°F 1018.3 hPa53°F
46121 26 mi36 min 5.8 65°F 1018.4 hPa55°F
46125 38 mi34 min 58°F 1018.5 hPa51°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, WA2 mi44 minWNW 610.00 miMostly Cloudy66°F54°F65%1019.4 hPa
Renton Municipal Airport, WA6 mi44 minVar 310.00 miOvercast65°F53°F66%1019.1 hPa
Boeing Field - King County International Airport, WA8 mi44 minNW 610.00 miMostly Cloudy66°F52°F61%1018.6 hPa
Tacoma, Tacoma Narrows Airport, WA19 mi44 minS 1010.00 miMostly Cloudy65°F54°F68%1018.6 hPa
Tacoma / McChord Air Force Base, WA21 mi99 minS 510.00 miOvercast67°F52°F60%1019.3 hPa
Pierce County-Thun Field, WA22 mi42 minWSW 510.00 miMostly Cloudy66°F55°F68%1019 hPa

Link to 5 minute data for KSEA

Wind History from SEA (wind in knots)
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Last 24hrSW10SW8SW12SW10SW7SW7S6SW6S6S10SW9SW11S7SW6SW10SW8SW9SW9SW14SW12SW11SW13S13
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1 day agoSW5SW6SW6W4W4W3CalmS3CalmS3S4S5S4S5S7S8S8SW8
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2 days agoW7NW6N8N8N6N6N6N6N4N3NE8NE4N4N7NE7N5CalmCalmW4W6SW6W75SW6

Tide / Current Tables for Des Moines, Washington
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Des Moines
Click for Map
Tue -- 01:27 AM PDT     6.95 feet Low Tide
Tue -- 05:21 AM PDT     Sunrise
Tue -- 06:00 AM PDT     10.33 feet High Tide
Tue -- 07:49 AM PDT     Moonset
Tue -- 01:16 PM PDT     -2.07 feet Low Tide
Tue -- 08:47 PM PDT     12.55 feet High Tide
Tue -- 09:07 PM PDT     Sunset
Tue -- 11:14 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.977.17.88.99.910.39.98.66.541.3-0.9-2-1.7-02.65.78.610.912.212.511.910.4

Tide / Current Tables for Skagit Bay, 1 mile N of Rocky Point, Washington Current
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Skagit Bay
Click for Map
Tue -- 12:58 AM PDT     -0.87 knots Max Ebb
Tue -- 02:52 AM PDT     0.00 knots Slack
Tue -- 05:21 AM PDT     Sunrise
Tue -- 05:21 AM PDT     0.22 knots Max Flood
Tue -- 05:54 AM PDT     -0.00 knots Slack
Tue -- 07:49 AM PDT     Moonset
Tue -- 12:12 PM PDT     -1.39 knots Max Ebb
Tue -- 02:06 PM PDT     0.01 knots Slack
Tue -- 06:18 PM PDT     1.18 knots Max Flood
Tue -- 08:51 PM PDT     -0.00 knots Slack
Tue -- 09:08 PM PDT     Sunset
Tue -- 11:15 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.8-0.9-0.500.10.2-0-0.3-0.6-0.8-1.1-1.3-1.4-1.1-0.10.40.811.21.10.6-0-0.3-0.6

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Seattle, WA (20,4,5,8)
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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.