Wednesday, February20, 2019 L-36.com


Marine Weather and Tides
Seattle, 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 7:04AMSunset 5:41PM Wednesday February 20, 2019 9:51 AM PST (17:51 UTC) Moonrise 7:20PMMoonset 8:03AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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- 831 Am Pst Wed Feb 20 2019
Today..N wind 5 to 15 kt. Wind waves 1 or 2 ft. A chance of showers.
Tonight..N wind 5 to 15 kt becoming 10 to 20 kt after midnight. Wind waves 1 to 3 ft.
Thu..N wind 5 to 15 kt. Wind waves 2 ft or less.
Thu night..Light wind becoming S 5 to 15 kt after midnight. Wind waves less than 1 ft becoming 2 ft or less after midnight.
Fri..S wind 15 to 25 kt. Wind waves 2 to 4 ft.
Fri night..SW wind 15 to 25 kt easing to 5 to 15 kt after midnight. Wind waves 2 to 4 ft subsiding to 2 ft or less after midnight.
Sat..S wind 5 to 15 kt. Wind waves 2 ft or less.
Sun..NE wind 5 to 15 kt. Wind waves 2 ft or less.
PZZ100 831 Am Pst Wed Feb 20 2019
Synopsis for the northern and central washington coastal and inland waters..Northerly flow will develop today and then turn more northeasterly tonight and Thursday as high pressure moves over southern british columbia. A frontal system will reach the area on Friday. Northeasterly offshore flow will develop over the weekend.


7 Day Forecast for Marine Location Near Seattle, WA
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location: 47.68, -122.41     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 201656
afdsew
area forecast discussion
national weather service seattle wa
856 am pst Wed feb 20 2019

Synopsis A cool upper level trough will remain over the area
today keeping showers in the forecast. Dry northerly flow aloft
developing tonight and continuing into Thursday. The next frontal
system will arrive from the northwest on Friday. Another cool
upper level trough will follow the front for the weekend into the
early part of next week. Low snow levels will continue through
the period.

Short term today through Friday Isolated to scattered showers
are expected today with a cool upper level trough over the region.

Snow levels are low this morning, around 500-1000 ft, and may see
a rain snow mix in the higher elevations with little to no
accumulation. We've had a few snow reports this morning in areas
like enumclaw and eatonville with just a light dusting.

Temperatures will rise into the lower 40s this afternoon for
mainly rain showers. 33
previous discussion... Upper level trough remaining over the area
tonight with drier northerly flow aloft increasing after midnight.

With the trough hanging around will have to keep a chance of
showers in the forecast for the evening hours. Snow levels will be
lowering as cooler air moves into the area so there is a chance
that the showers could be rain and snow mixed or briefly in the
form of snow. No significant accumulations expected. Lows tonight
will be in the mid 20s to mid 30s.

A little break in the action on Thursday with dry northerly flow
aloft over the area. Cloud cover decreasing Wednesday night and
with light surface gradients patchy morning freezing fog
developing with the best chances over the southwest interior. Even
with some sunshine Thursday afternoon highs will only be in the
upper 30s to mid 40s.

Temporary upper level ridge moving through the area Thursday
night ahead of the next frontal system moving down the british
columbia coast. Models in better agreement on the 00z run going
more with the slower timing of previous ECMWF runs. The slower
timing will keep the chance of precipitation confined to the north
coast early Friday morning. Lows will be in the mid 20s to mid
30s.

Slower timing of the front keeping most of the moisture out of the
interior Friday morning. Snow levels will be low, 500 feet or
less, so if the precipitation does arrive a little earlier it will
be in the form of snow initially. As with the previous system
increasing onshore flow ahead of the system will lift the snow
levels up to around 1000 feet in the afternoon. Highs on Friday
will be in the lower to mid 40s. Felton

Long term Saturday through Tuesday Previous discussion... Extended
models in good agreement with the front moving through the area
Friday night into Saturday morning with another post frontal
convergence zone possible. This feature has the potential to lower
the snow levels back down to 500 feet or less. Cool upper level
trough settling over the area for the weekend into Monday. With
the trough in the area will have to keep at least a chance of
showers in the forecast. Snow levels will remain low generally
1000 feet or less. Any showers that occur in the late night and
early morning hours could result in some small snow accumulations
especially on the higher hills.

Model solutions very inconsistent on Tuesday with the ecmwf
lifting a warm front up from the south into the area. The gfs
keeps this feature well south of the area. With the lack of
consistency in the models will go with chance pops on Tuesday.

Highs will remain well below normal through the period with a
chance for some warming on Tuesday. Felton

Aviation Northwest flow aloft with a fairly moist unstable
air mass with scattered showers. As drier air moves into the region
skies will clear later today and there area already areas of
sunshine out on the coast and over parts of the strait of juan
de fuca.

Ksea... A few showers today, but clearing later today. There might be
a few wet snowflakes mixed in with the showers this morning.

Marine Small craft advisories are up for the coastal waters, but
the inland waters mainly have northwest winds 5-15kts. Breezy
northeast winds are expected to develop tonight in the northern
waters as high pressure builds over british columbia. A cold front
will reach western washington on Friday.

Hydrology River flooding is not expected for the next 7 days

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory until 10 pm pst this evening 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.

Small craft advisory for rough bar until 8 pm pst this evening
for grays harbor bar.

Small craft advisory for hazardous seas until 6 am pst Thursday
for coastal waters from CAPE flattery to james island out
10 nm-coastal waters from james island to point grenville
out 10 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 midnight tonight to noon pst Thursday
for central u.S. Waters strait of juan de fuca-east
entrance u.S. Waters strait of juan de fuca.

Small craft advisory from 4 pm this afternoon to noon 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
WPOW1 - West Point, WA 2 mi52 min E 2.9 G 4.1 37°F 1011.8 hPa (+0.9)33°F
46120 6 mi34 min 39°F 1010.8 hPa34°F
TCMW1 - 9446482 - Tacoma Met, WA 28 mi40 min Calm G 1.9
TCNW1 - 9446484 - Tacoma, WA 29 mi40 min 38°F 48°F1012.1 hPa
46121 32 mi33 min 40°F 1011.6 hPa37°F
PTWW1 - 9444900 - Port Townsend, WA 35 mi40 min WNW 4.1 G 5.1 40°F 46°F1012.1 hPa

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boeing Field - King County International Airport, WA12 mi59 minESE 310.00 miOvercast39°F34°F82%1011.6 hPa
Renton Municipal Airport, WA16 mi59 minN 07.00 miOvercast37°F34°F89%1012.1 hPa
Everett Snohomish County, WA17 mi59 minN 010.00 miOvercast37°F34°F89%1011.3 hPa
Seattle, Seattle-Tacoma International Airport, WA17 mi59 minENE 510.00 miOvercast38°F33°F83%1011.9 hPa
Bremerton, Bremerton National Airport, WA24 mi56 minN 010.00 miOvercast36°F35°F97%1013 hPa

Wind History from BFI (wind in knots)
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Last 24hrS6S7S6S5S65S7S9
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1 day agoSE7E5E4E5SE4E3E4E3CalmCalmCalmSE3SE4SE4SE5SE4S4SE53S3SE6SE5CalmS7
2 days agoSE3S3CalmW4CalmN3Calm3CalmCalmCalmSE3CalmS3SE4SE6SE3SE6SE5SE6SE6SE6S6SE5

Tide / Current Tables for Meadow Point, Shilshole Bay, Washington
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Meadow Point
Click for Map
Wed -- 05:50 AM PST     12.71 feet High Tide
Wed -- 07:07 AM PST     Sunrise
Wed -- 08:02 AM PST     Moonset
Wed -- 11:33 AM PST     4.56 feet Low Tide
Wed -- 04:57 PM PST     11.04 feet High Tide
Wed -- 05:40 PM PST     Sunset
Wed -- 07:19 PM PST     Moonrise
Wed -- 11:34 PM PST     -1.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.81.64.77.910.612.312.71210.38.164.74.75.77.39.110.51110.48.76.23.40.7-0.9

Tide / Current Tables for Alki Point, 0.3 miles W of, Washington Current
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Alki Point
Click for Map
Wed -- 02:08 AM PST     0.99 knots Max Flood
Wed -- 05:51 AM PST     -0.01 knots Slack
Wed -- 07:07 AM PST     Sunrise
Wed -- 08:03 AM PST     Moonset
Wed -- 08:33 AM PST     -0.61 knots Max Ebb
Wed -- 12:01 PM PST     0.00 knots Slack
Wed -- 02:15 PM PST     0.51 knots Max Flood
Wed -- 05:04 PM PST     -0.00 knots Slack
Wed -- 05:40 PM PST     Sunset
Wed -- 07:19 PM PST     Moonrise
Wed -- 08:24 PM PST     -0.76 knots Max Ebb
Wed -- 11:56 PM PST     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.810.90.70.3-0.1-0.4-0.6-0.6-0.5-0.3-00.30.50.50.30-0.3-0.6-0.7-0.7-0.6-0.3

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 (12,3,4,5)
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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.