Monday, January22, 2018 L-36.com


Marine Weather and Tides
SeaTac, WA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:43AMSunset 4:58PM Monday January 22, 2018 11:45 AM PST (19:45 UTC) Moonrise 10:37AMMoonset 10:58PM Illumination 35% 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- 900 Am Pst Mon Jan 22 2018
.small craft advisory in effect until noon pst today...
Today..S wind 15 to 25 kt easing to 10 to 20 kt around mid- day. Wind waves 2 to 4 ft subsiding to 1 to 3 ft. Showers in the morning then scattered showers in the afternoon.
Tonight..S wind to 10 kt becoming se 5 to 15 kt after midnight. Wind waves 2 ft or less. A slight chance of showers in the evening. A slight chance of rain after midnight.
Tue..SE wind 10 to 20 kt. Wind waves 1 to 3 ft. Rain.
Tue night..S wind 5 to 15 kt. Wind waves 2 ft or less.
Wed..S wind 5 to 15 kt. Wind waves 2 ft or less.
Wed night..S wind 5 to 15 kt becoming 10 to 20 kt after midnight. Wind waves 1 to 3 ft.
Thu..S wind 15 to 25 kt easing to 10 to 20 kt. Wind waves 2 to 4 ft.
Fri..S wind 5 to 15 kt becoming 10 to 20 kt. Wind waves 1 to 3 ft.
PZZ100 900 Am Pst Mon Jan 22 2018
Synopsis for the northern and central washington coastal and inland waters..Moderate southerly onshore flow will ease today into this evening. A warm front will move east through the waters on Tuesday giving strong east to southeast pressure gradients with gales over the coastal waters and near the east entrance to the strait of juan de fuca. A couple of small but vigorous lows will move into vancouver island Wednesday into Wednesday night. Another strong front and associated low will affect the waters Friday night.

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 221753
afdsew
area forecast discussion
national weather service seattle wa
953 am pst Mon jan 22 2018

Synopsis Strong westerly flow aloft will prevail today. Weak
high pressure aloft will move over the region tonight. Expect a
pacific storm to impact the region Tuesday through Wednesday for
gusty winds and locally heavy precipitation.

Short term
There were scattered showers over the area at this time. The
showers were more numerous over the mountains. Expect small hail
to accompany the heavier showers on the lowlands today. The winter
weather advisory for the cascades in snohomish and king counties
was extended until 4 pm pst, today. This area could receive
another 3-6 inches of new snow by the end of the day.

Meanwhile, strong zonal flow aloft will prevail across the region
today. Look for a weak short wave ridge to move over the area
tonight. It looks like there may be a dry period across much of
the CWA tonight. Alas, another pacific storm will impact the
region on Tuesday for locally heavy snow in the mountains,
especially on the southwest facing slopes. A winter storm watch
may be needed for the cascades in pierce and lewis counties.

It looks like the cold or occluded front will stall as it becomes
parallel with the flow Tuesday night. Therefore, expect wet
weather with locally heavy precipitation to continue Tuesday
night through Wednesday. The snow levels will also rise into the
4500 to 5000 ft range across much of the area Tuesday night due to
warm air advection.

The cold or occluded front is anticipated to move across the cwa
late Wednesday afternoon or evening; although, the atmosphere will
undergo cooling ahead of the front as heights thicknesses lower.

Thus, anticipate snow levels to lower during the day Wednesday.

Long term from the prev discussion
Conditions will turn more showery Thursday as an upper level
trough moves into the region. This trough will be colder than
recent ones, with heights in the 530s. The snow level Thursday
night will fall to below 1000 feet in some areas, and overnight
low temperatures will be in the low to mid 30s. The upshot is
there could be a little lowland snow by Friday morning. Showers
will taper considerably later Friday and warm advection should
melt any snow on the ground.

The latest run of the GFS has periods of heavy rain over the
weekend, though not as much as in some previous runs. The euro is
similar. High pops with high temperatures in the 50s seem likely
Saturday and Sunday. Burke

Aviation A flat upper ridge axis will pass across western
washington this evening. As a result, shower coverage will be
diminishing, and the unstable air mass will become stable late
this evening. Overnight, easterly surface winds will develop and
dry out any remaining CIGS below about 030-050. A warm front will
arrive on Tuesday morning, bringing the arrival of rain and cigs
lowering mostly below 030 by late morning. Moderate westerly flow
aloft today will become strong southwesterly on Tuesday morning.

Ksea... With westerly flow aloft, the terminal will be near the
southern edge of an olympic rain shadow for the rest of today,
limiting any remaining showers today to short 10-15 minute
affairs. Most showers will be seen passing south of the terminal.

Any CIGS should be in the 035-050 range today. Showers will end
outright for the evening hours, and the development of a drying surface
easterly wind component will help to dissipate any remaining
clouds below 045 for the overnight hours. On Tuesday, a warm front
will spread rain across the terminal around 14z, and CIGS will
fall below 030 by late Tue morning.

Marine Moderate southerly onshore flow early this morning will
gradually ease through this evening. Small craft advisories
remain in effect for winds or seas along the coast and at the west
entrance to the strait through this evening, while residual small
craft advisory conditions continue over the strait and portions
of the puget sound.

A strong warm front will spread into the waters early Tuesday
morning, and a 985 mb low will pass northward out beyond 130w.

Easterly then southeasterly gradients will tighten and become
strong, so gales are expected starting early Tuesday morning over
the coastal waters, the strait, and up to near haro strait. Gale
warnings are now in effect to cover these zones.

Latest forecast models show a couple of small, but vigorous lows
rotating around an upper level low in the gulf of alaska and into
vancouver island on Wednesday and Wednesday night. Gales are
possible with these features, and seas in excess of 20 feet
developing on the south side of these lows will likely affect the
waters on Thursday.

Yet another in a series of strong systems will affect the waters
later Friday or Friday night into next weekend. Haner

Hydrology
The skokomish river in mason county was slightly above flood stage
at this time, and is forecast to fall below flood stage later this
morning. More rain Tuesday night could bring the skokomish river
above flood stage for another round of minor flooding.

Recent rainfall has brought the USGS landslide indices closer to
thresholds for shallow landslides, but the still thresholds have
not have been exceeded.

Flooding is unlikely on rivers other than the skokomish through
Friday. Some models showed heavy rain on the olympics and
cascades this weekend. This rain, if it occurs, could be heavy
enough for more widespread flooding. Burke 05

Sew watches warnings advisories
Wa... Winter weather advisory until 4 pm pst this afternoon for
cascades of snohomish and king counties.

Pz... Gale warning from midnight tonight to 4 pm pst Tuesday 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 for hazardous seas until midnight pst
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-
west entrance u.S. Waters strait of juan de fuca.

Small craft advisory for rough bar until 4 am pst Tuesday for
grays harbor bar.

Small craft advisory until 3 pm pst this afternoon for central
u.S. Waters strait of juan de fuca-east entrance u.S.

Waters strait of juan de fuca.

Gale warning from 6 am to 3 pm pst Tuesday for central u.S.

Waters strait of juan de fuca-east entrance u.S. Waters
strait of juan de fuca-northern inland waters including the
san juan islands.

Small craft advisory until noon pst today for puget sound and
hood canal.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 12 mi45 min SSW 9.9 G 16
TCNW1 - 9446484 - Tacoma, WA 13 mi45 min 46°F 49°F1025.2 hPa (+2.6)
EBSW1 - 9447130 - Seattle, WA 13 mi45 min S 7 G 12 46°F 48°F1024.5 hPa (+2.8)
WPOW1 - West Point, WA 19 mi45 min S 16 G 17 45°F 1024.1 hPa (+2.9)40°F
46120 24 mi38 min WNW 14 45°F 1023.2 hPa40°F

Wind History for Tacoma MET, WA
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SW14
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Seattle, Seattle-Tacoma International Airport, WA2 mi52 minS 13 G 1910.00 miMostly Cloudy45°F39°F80%1024.8 hPa
Renton Municipal Airport, WA6 mi52 minSSE 810.00 miMostly Cloudy47°F39°F74%1024.8 hPa
Boeing Field - King County International Airport, WA8 mi52 minS 9 G 1710.00 miFair47°F39°F77%1024.2 hPa
Tacoma, Tacoma Narrows Airport, WA19 mi52 minS 1110.00 miMostly Cloudy43°F39°F89%1025.1 hPa
Tacoma / McChord Air Force Base, WA21 mi1.8 hrsS 610.00 miPartly Cloudy43°F42°F100%1025 hPa
Pierce County-Thun Field, WA22 mi70 minSSW 710.00 miPartly Cloudy46°F41°F82%1024.7 hPa

Wind History from SEA (wind in knots)
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SE9S11S10S10S13S6SW6S7S10S14SW13S11S11S12S16S13
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1 day agoS11SE11S11S10S11S11S11S13S12
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S11S11S10S10S12S10S10S13

Tide / Current Tables for Des Moines, Washington
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Des Moines
Click for Map
Mon -- 01:49 AM PST     1.41 feet Low Tide
Mon -- 07:46 AM PST     Sunrise
Mon -- 08:40 AM PST     12.61 feet High Tide
Mon -- 10:37 AM PST     Moonrise
Mon -- 03:05 PM PST     4.51 feet Low Tide
Mon -- 04:56 PM PST     Sunset
Mon -- 08:21 PM PST     8.95 feet High Tide
Mon -- 10:58 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.11.81.42.34.16.6911.112.412.611.810.38.46.55.14.54.95.97.28.38.98.87.96.6

Tide / Current Tables for Skagit Bay, 1 mile N of Rocky Point, Washington Current
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Skagit Bay
Click for Map
Mon -- 12:52 AM PST     -0.97 knots Max Ebb
Mon -- 02:34 AM PST     0.00 knots Slack
Mon -- 06:36 AM PST     0.82 knots Max Flood
Mon -- 07:47 AM PST     Sunrise
Mon -- 08:44 AM PST     -0.00 knots Slack
Mon -- 10:38 AM PST     Moonrise
Mon -- 02:02 PM PST     -0.98 knots Max Ebb
Mon -- 04:20 PM PST     0.00 knots Slack
Mon -- 04:56 PM PST     Sunset
Mon -- 07:07 PM PST     0.27 knots Max Flood
Mon -- 08:04 PM PST     -0.00 knots Slack
Mon -- 10:58 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.9-1-0.50.10.40.70.80.80.4-0.1-0.4-0.6-0.8-0.9-1-0.7-0.20.10.20.30-0.2-0.4-0.6

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Seattle, WA (14,3,4,5)
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Ground Weather Radar Station Seattle/Tacoma, WA
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weather_mapweather_map weather_map

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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.