Thursday, November15, 2018 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 7:13AMSunset 4:34PM Thursday November 15, 2018 1:04 AM PST (09:04 UTC) Moonrise 1:36PMMoonset 11:45PM Illumination 48% Phase: First Quarter Moon; Moon at 7 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- 848 Pm Pst Wed Nov 14 2018
Tonight..S wind to 10 kt. Wind waves 1 ft. A slight chance of showers.
Thu..S wind 10 to 20 kt. Wind waves 1 to 3 ft.
Thu night..S wind 15 to 20 kt easing to 10 to 15 kt after midnight. Wind waves 1 to 3 ft. A chance of showers.
Fri..SW wind to 10 kt becoming N 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Fri night..N wind 5 to 15 kt. Wind waves 1 to 2 ft.
Sat..NE wind to 10 kt. Wind waves 1 ft.
Sat night..N wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Sun..Light wind. Wind waves less than 1 ft.
Mon..Light wind. Wind waves less than 1 ft.
PZZ100 848 Pm Pst Wed Nov 14 2018
Synopsis for the northern and central washington coastal and inland waters..Gradients and winds will subside tonight. A second system will move through Thursday afternoon into early Friday. Small craft advisory conditions likely again for the coastal waters, west entrance, and northern inland waters. In wake of this system, offshore flow will return for the weekend.


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 150553
afdsew
area forecast discussion
national weather service seattle wa
953 pm pst Wed nov 14 2018

Update
Periods of rain showers have essentially come to a close this
evening as today's frontal system fades out. Water vapor imagery
this evening shows a deepening trough near 160w, which in turn in
helping build a ridge downstream across the eastern pacific and
towards the west coast. This will allow for weak height rises
across western washington over the next 12 hours or so. In turn,
this will allow for a brief break in the more active weather we've
seen over the last 24 hours. Although tonight will be dry,
abundant low cloud cover will remain in place and min temps will
likely be a degree or two warmer than last night with lows in the
mid and upper 40s generally the rule for coastal and lowland
locations.

The brief respite in the more quiet weather pattern will be
short-lived as the next shortwave begins to drop south from NW bc,
southeast towards the northern us border. This will push some
cloud cover down towards the local area early Thursday, tho this
will be masked by residual stratus into the afternoon. As the
shortwave propagates closer to the area late Thursday afternoon
and evening, the bulk of the vorticity will be displaced to our
east. Nonetheless, jet forcing and associated weak sfc frontal
system will be enough to push some shower activity into the area.

Rain is expected to be light and not cause major impacts, and most
of the activity will occur late Thursday into Friday morning.

Will see gradual drying thru the day Friday with ridging expected
to build into the area for the weekend. Dry weather still looks on
tap thru at least Monday before synoptic scale discrepancies
become much more obvious.

Please refer to the previous discussion below for further forecast
information.

Kovacik

Prev discussion issued 208 pm pst Wed nov 14 2018

Synopsis Showers will gradually diminish this evening. The
next weather system will keep conditions wet Thursday and into
Friday. Upper level ridging is expected to resume over the weekend
allowing for dry conditions as well as overnight and morning fog.

A front may approach the region early next week with a chance of
rain.

Short term After a fairly breezy start to the day across the
north sound, winds have decreased significantly. Showers continue
to drift across western washington this afternoon with a modest
pscz extending east across snohomish county. These showers will
gradually diminish over the next 6 to 12 hours. However, the next
shortwave will come quickly on its heals with showers spreading
south across the region Thursday into Friday. Precipitation
amounts with this next system appear to be low-impact at this
time. -wolcott-

Long term A strong upper level ridge amplifies offshore
Friday, then shifts over the pacific northwest over the weekend.

Models keep the ridge in place through at least Monday, with areas
of night and morning fog. Cold pocket locations will drop below
freezing for lows, with freezing fog likely around the southwest
interior and interior south puget sound.

The gfs ECMWF continue to have difficulty establishing the long
wave pattern next week, although both models agree on split flow.

This will tend to slow and weaken systems as the northern branch
brings systems into the region. Timing of systems early next week
is difficult with models flip flopping with each run. The ecmwf
shows some light rain possible by Monday night or Tuesday. A more
active weather pattern could develop next week.

Mercer

Aviation Frontal passage today with residual lower level
moisture in place will allow for abundant coverage of low cloud
cover overnight tonight into Thursday. Ceilings have been lowering
over the last several hours to low-end MVFR and high-end ifr. This
trend is expected to continue thru the overnight and morning
hours. Some fog will also be possible. Could see some brief breaks
in the afternoon on Thursday but a secondary system will likely
reinforce cloud cover Thursday night and Friday. Winds from the
south will be the rule this TAF cycle.

Kovacik
ksea... Shower activity has diminished for the night. Moist
airmass in place will likely keep MVFR ceilings and potentially
ifr if current trends keep up going into Thursday morning.

Improvement toVFR will be possible after 18-20z before ceilings
lower again Thursday night into Friday. Winds likely to dance from
sw to SE thru the period at under 10kts.

Kovacik

Marine Weak onshore flow will continue thru Thursday as high
pressure resides just offshore the pacnw coast. Gradients have
become much more relaxed after frontal passage today and overall
expecting a break in the stronger winds overnight tonight. By
Thursday morning, attention will be placed on the next quick
moving weather system across bc, along with a deepening trough
near 160w. Guidance is indicating increasing swells with
increasing period to near 10-11ft across the outer coastal waters
and the west entrance near daybreak Thursday and for now will
leave SCA for hazardous seas across this area. Gradients also look
to tighten across the northern inland waters Thursday morning and
current SCA for winds across those waters looks good for now.

Gradients and seas relax for Friday as more tranquil weather looks
to be store.

Kovacik

Hydrology Will need to monitor rainfall for later this week
with the next system brushing the area Thursday, but amounts look
about the same as today . Flooding is unlikely on area rivers
through the next 7 days. Jbb

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory for hazardous seas from 7 am to 10 pm pst
Thursday 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-
west entrance u.S. Waters strait of juan de fuca.

Small craft advisory from 10 am to 10 pm pst Thursday for
northern inland waters including the san juan islands.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 12 mi34 min SSE 5.1 G 6
TCNW1 - 9446484 - Tacoma, WA 13 mi34 min 51°F 53°F1029.4 hPa
EBSW1 - 9447130 - Seattle, WA 13 mi34 min S 4.1 G 6 53°F 52°F1028.7 hPa
WPOW1 - West Point, WA 19 mi64 min SSW 12 G 13 51°F 1028.7 hPa (+0.5)49°F
46120 24 mi30 min NE 5.8 52°F 1027.8 hPa49°F
46121 26 mi29 min 51°F 1028.9 hPa48°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 mi71 minSSW 79.00 miOvercast51°F46°F86%1029.5 hPa
Renton Municipal Airport, WA6 mi71 minSSE 410.00 miOvercast53°F46°F80%1029.4 hPa
Boeing Field - King County International Airport, WA8 mi71 minS 710.00 miOvercast52°F46°F83%1028.9 hPa
Tacoma, Tacoma Narrows Airport, WA19 mi71 minS 610.00 miOvercast49°F46°F90%1029.1 hPa
Tacoma / McChord Air Force Base, WA21 mi66 minN 010.00 miOvercast48°F48°F100%1029.6 hPa
Pierce County-Thun Field, WA22 mi69 minN 010.00 miOvercast46°F46°F100%1029.1 hPa

Wind History from SEA (wind in knots)
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Last 24hrS7SW9S6S11SW12S6SW6S8SW9S13S17
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1 day agoW3SE5CalmSE3CalmS4S3S4S9S7S7S7S8S6S9S12S10S8S5S3S4SW3S7NW3
2 days agoNE5NE9E6NE7E6NE7NE8E8E7E5E55SE9E8E8E7E10SE9
G16
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Tide / Current Tables for Des Moines, Washington
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Des Moines
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Thu -- 03:51 AM PST     1.84 feet Low Tide
Thu -- 06:54 AM PST     First Quarter
Thu -- 07:14 AM PST     Sunrise
Thu -- 11:31 AM PST     11.59 feet High Tide
Thu -- 01:35 PM PST     Moonrise
Thu -- 04:33 PM PST     Sunset
Thu -- 06:08 PM PST     6.02 feet Low Tide
Thu -- 10:19 PM PST     7.59 feet High Tide
Thu -- 11:45 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.84.53.22.11.92.43.75.47.49.310.811.511.510.99.88.37.16.366.26.67.27.67.5

Tide / Current Tables for Restoration Point, 0.6 miles ESE of, Washington Current
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Restoration Point
Click for Map
Thu -- 12:56 AM PST     -0.58 knots Max Ebb
Thu -- 04:45 AM PST     0.00 knots Slack
Thu -- 06:54 AM PST     First Quarter
Thu -- 07:15 AM PST     Sunrise
Thu -- 07:22 AM PST     0.50 knots Max Flood
Thu -- 11:15 AM PST     -0.00 knots Slack
Thu -- 01:36 PM PST     Moonrise
Thu -- 02:51 PM PST     -0.57 knots Max Ebb
Thu -- 04:33 PM PST     Sunset
Thu -- 08:41 PM PST     -0.01 knots Min Ebb
Thu -- 11:45 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.5-0.6-0.5-0.4-0.20.10.30.50.50.40.20.1-0.2-0.4-0.5-0.6-0.5-0.4-0.2-0.1-0-0-0.1-0.2

Weather Map and Satellite Images
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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 (4,6,7,8)
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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.