Tuesday, May21, 2019 L-36.com


Marine Weather and Tides
SeaTac, WA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:24AMSunset 8:46PM Monday May 20, 2019 11:55 PM PDT (06:55 UTC) Moonrise 9:54PMMoonset 5:58AM Illumination 95% 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- 900 Pm Pdt Mon May 20 2019
Tonight..NE wind to 10 kt. Wind waves 1 ft or less. Showers in the evening then a chance of showers after midnight.
Tue..Variable wind 5 to 15 kt becoming nw in the afternoon. Wind waves 2 ft or less. A slight chance of showers.
Tue night..NE wind 5 to 15 kt in the evening becoming light. Wind waves 2 ft or less.
Wed..Light wind becoming nw to 10 kt in the afternoon. Wind waves 1 ft or less.
Wed night..N wind 5 to 15 kt becoming W after midnight. Wind waves 2 ft or less.
Thu..Light wind becoming N to 10 kt in the afternoon. Wind waves 1 ft or less.
Thu night..NW wind 5 to 15 kt becoming se after midnight. Wind waves 2 ft or less.
Fri..S wind 5 to 15 kt becoming sw 10 to 20 kt. Wind waves 1 to 3 ft.
Sat..Light wind. Wind waves less than 1 ft.
PZZ100 900 Pm Pdt Mon May 20 2019
Synopsis for the northern and central washington coastal and inland waters..Onshore flow will ease tonight then increase on Tuesday as a surface low moves inland. High pressure over the ne pacific will maintain onshore flow through the rest of the week.


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 210355
afdsew
area forecast discussion
national weather service seattle wa
900 pm pdt Mon may 20 2019

Synopsis An upper level low off the coast will will continue to
bring scattered showers through Tuesday morning. A drier period is
forecast Wednesday and Thursday as a ridge builds, with showers
limited to the mountains. An upper low will bring more showers
Friday and Saturday, with another dry period Sunday and Monday.

Short term tonight through Thursday Persistent showers have
continued this evening and seem likely to last all night. As an
upper level low off the coast moves southeast into oregon, showers
will first move south late tonight, then end by noon Tuesday or so.

High temperatures on Tuesday will be in the 60s.

Wednesday and Thursday look like dry days, except for scattered
afternoon and evening showers in the mountains. Heights will rise a
bit, and under sunny skies high temperatures will rise well into the
70s both days, 60s coast. Burke

Long term Friday through Monday Previous discussion... A ridge
will continue to build into the area on Thursday, again allowing for
mostly dry conditions with the exception being the mountains.

Instability may again warrant the mention of isolated thunder. By
Friday, a subtle shortwave trough will pass through the area from
the north. This will likely allow for increased cloud cover and
perhaps the potential for slightly higher shower coverage-possibly
extending into the lowlands. As this low continues to pull south
into oregon on Saturday it is expected to become closed. This may
lead to continued shower chances through most of the weekend-at
least across the mountains. Ensemble data then argues for another
ridge to build into the area by Monday, which would lead to the
return of drier weather. Have leaned towards this ensemble solution,
as inevitably the deterministic guidance differs noticeably. Kovacik

Aviation Southeasterly flow aloft tonight will become easterly
Tuesday as an upper level low off the coast moves southeast into
oregon. The air mass is moist and slightly unstable with scattered
showers. Expect more showers across the region tonight, with rain
mainly affecting areas from seattle south on Tuesday as the low
slowly exits. Most ceilings areVFR this evening, but with abundant
moisture and light winds, expect pockets of MVFR to ifr conditions
through Tuesday morning. 33 chb
ksea... Showers continue this evening with a possible break early tue
morning. Winds NE 4-8 kt. MVFR ceilings likely after 08z. Chb

Marine Winds are a bit stronger than forecast on the coast, so
increased the forecast there to 10-20 kt over the inner coast, and
15-25 kt with a small craft advisory over the outer coast. A low
well off the columbia river will move southeast into oregon tonight
and Tuesday. After the low moves inland, moderate onshore flow will
develop Tuesday afternoon. This onshore flow pattern will likely
bring advisory level winds to the strait and possibly the coast each
evening. Northwest gales are possible on the coast Friday. Chb

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 until 5 am pdt Tuesday for coastal waters
from CAPE flattery to james island 10 to 60 nm-coastal
waters from james island to point grenville 10 to 60 nm-
coastal waters from point grenville to CAPE shoalwater 10
to 60 nm.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 12 mi62 min S 1 G 1.9
TCNW1 - 9446484 - Tacoma, WA 13 mi62 min 53°F 51°F1006.8 hPa
WPOW1 - West Point, WA 19 mi56 min E 7 G 12 51°F 1007.1 hPa (-0.8)47°F
46120 24 mi45 min E 5.8 51°F 1005.9 hPa47°F
46121 26 mi41 min 54°F 1006.2 hPa48°F
46125 38 mi42 min 3.9 51°F 1006.6 hPa47°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 mi63 minN 010.00 miOvercast52°F46°F80%1007.3 hPa
Renton Municipal Airport, WA6 mi63 minN 07.00 miOvercast52°F46°F83%1007.3 hPa
Boeing Field - King County International Airport, WA8 mi63 minENE 710.00 miOvercast52°F46°F80%1006.8 hPa
Tacoma, Tacoma Narrows Airport, WA19 mi63 minNE 610.00 miPartly Cloudy51°F44°F77%1006.3 hPa
Tacoma / McChord Air Force Base, WA21 mi2 hrsNE 610.00 miMostly Cloudy52°F51°F99%1007.1 hPa
Pierce County-Thun Field, WA22 mi61 minN 010.00 miOvercast50°F50°F100%1006.4 hPa

Wind History from SEA (wind in knots)
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Last 24hrSW7SW6SW6SW6SW7SW5S8S8S9S8S9S6S8SW11S10S9SW6SW63E8E6NE11E10Calm
1 day agoW4CalmS4S4SW3SW4CalmCalm3NE5CalmW4W4W7W7SW65SW7SW8SW9SW9S8SW9SW9
2 days agoS4SE3S3CalmCalmE4CalmCalmE5E4S3CalmCalmSW6N7NW6NW8NW9N10N9N12N12NE12SW7

Tide / Current Tables for Des Moines, Washington
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Des Moines
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Tue -- 01:29 AM PDT     6.41 feet Low Tide
Tue -- 05:25 AM PDT     Sunrise
Tue -- 06:20 AM PDT     10.59 feet High Tide
Tue -- 07:43 AM PDT     Moonset
Tue -- 01:31 PM PDT     -1.81 feet Low Tide
Tue -- 08:46 PM PDT     Sunset
Tue -- 08:58 PM PDT     12.11 feet High Tide
Tue -- 11:49 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.46.56.57.38.69.810.510.49.37.44.92.2-0.2-1.6-1.6-0.324.97.810.211.612.111.710.4

Tide / Current Tables for Skagit Bay, 1 mile N of Rocky Point, Washington Current
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Skagit Bay
Click for Map
Tue -- 01:03 AM PDT     -0.86 knots Max Ebb
Tue -- 02:50 AM PDT     0.00 knots Slack
Tue -- 05:26 AM PDT     Sunrise
Tue -- 05:30 AM PDT     0.28 knots Max Flood
Tue -- 06:15 AM PDT     -0.00 knots Slack
Tue -- 07:44 AM PDT     Moonset
Tue -- 12:26 PM PDT     -1.40 knots Max Ebb
Tue -- 02:21 PM PDT     0.01 knots Slack
Tue -- 06:31 PM PDT     1.13 knots Max Flood
Tue -- 08:47 PM PDT     Sunset
Tue -- 09:04 PM PDT     -0.00 knots Slack
Tue -- 11:51 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.8-0.9-0.500.20.30.2-0.2-0.5-0.8-1.1-1.3-1.4-1.3-0.40.30.711.11.10.70-0.3-0.5

Weather Map and Satellite Images
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wmap_P
GOES 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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Wind Forecast for Seattle, WA (2,6,7,8)
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Ground Weather Radar Station Seattle/Tacoma, WA
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Disclaimer:
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 numerious 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.