Thursday, August24, 2017 L-36.com


Marine Weather and Tides
Vashon, 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 6:17AMSunset 8:04PM Thursday August 24, 2017 3:37 AM PDT (10:37 UTC) Moonrise 8:35AMMoonset 8:47PM Illumination 5% Phase: Waxing Crescent; Moon at 2 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- 243 Am Pdt Thu Aug 24 2017
Today..N wind to 10 kt north of tacoma, otherwise S wind to 10 kt. Wind waves 1 ft or less.
Tonight..N wind 5 to 15 kt becoming ne after midnight. Wind waves 2 ft or less.
Fri..N wind to 10 kt. Wind waves 1 ft or less.
Fri night..N wind to 10 kt becoming ne after midnight. Wind waves 1 ft or less.
Sat..Light wind becoming N to 10 kt in the afternoon. Wind waves 1 ft or less.
Sat night..N wind 5 to 15 kt becoming ne to 10 kt after midnight. Wind waves 2 ft or less.
Sun..N wind to 10 kt. Wind waves 1 ft or less.
Mon..N wind to 10 kt. Wind waves 1 ft or less.
PZZ100 243 Am Pdt Thu Aug 24 2017
Synopsis for the northern and central washington coastal and inland waters..Onshore flow today will weaken tonight and Friday. Light northerly flow will prevail this weekend, with the flow trending weakly offshore on Monday.

7 Day Forecast for Marine Location Near Vashon, WA
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location: 47.4, -122.46     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 241003
afdsew
area forecast discussion
national weather service seattle wa
303 am pdt Thu aug 24 2017

Synopsis A weak weather system moved by mostly to the north of
the area overnight. An upper level trough will move through the
area today bringing with it some cloud cover and cooler
temperatures but little if any precipitation. Friday will be a
transition day with a strong upper level ridge building over the
area Saturday. The ridge will remain over the area through the
early part of next week for another round of warm days in western
washington.

Short term Satellite imagery shows weak system has moved by
mainly to the north of the area overnight with the southern
portion of the system in the cascades early this morning. Skies
have cleared a bit along the north coast in the wake of the system
with the remainder of the area reporting mostly cloudy skies at
09z 2 am. Temperatures because of the cloud cover were in the mid
50s to lower 60s except along the north coast where temperatures
have dropped into the upper 40s.

Upper level trough moving through the area today behind the weak
system. Langley hill radar showing nothing in the way of
precipitation echoes offshore. Model cross sections have very
little lift with the moisture field only extending up to around
7000 feet. Have taken the slight chance of showers out of the
lowlands this morning. The added lift of the cascades could help
generate a light shower so have kept low pops just in the morning
hours in the mountains. For most of the area the main effect of
the trough will be a little more cloud cover and cooler
temperatures. Highs today will be below normal with 60s and lower
70s common.

Zonal flow aloft over the area tonight. Low level flow turning
northerly below about 700 mb. This is not a favorable pattern for
stratus especially over the interior. Still some cool air left
behind by the upper level trough with lows in the cooler locations
getting into the 40s. Most of the area will have lows in the
lower to mid 50s.

500 mb heights start to slowly rise on Friday. Low level flow
remaining light and northerly. With the temperatures warming aloft
and the lack of cloud cover high temperatures rebounding by a few
degrees on Friday with most places in the upper 60s and 70s.

Upper level ridge building quickly over the area from the
southeast Friday night into Saturday. 500 mb heights rise from the
upper 570 dms at 00z Saturday to the upper 580 dms by 00z Sunday.

Surface gradients remain northwesterly which will temper the
warming trend a little. Even with the northwesterly low level flow
highs on Saturday 5 degrees or so above normal with 70s to mid
80s in the forecast.

Long term Some general agreement in the extended models for
Sunday and Monday with western washington on the back side of the
upper level ridge. The ECMWF is stronger with the ridge with 500
mb heights staying in the mid to upper 580 dms while the GFS moves
the ridge a little further to the east with 500 mb heights in the
lower 580 dms. Even with the difference aloft the high temperature
guidance on both models is similar with up to 5 degrees more of
warming on Sunday with highs a couple of degrees warmer on Monday
as the low level flow tries to turn offshore. Highs in the 80s
will be common from about seattle south on Sunday with the warmer
locations in the upper 80s. Highs in the 70s for the remainder of
the area. On Monday 80s will be common over most of the interior
with some lower 90s in the warmer locations in the southwest
interior. GFS has a couple of shortwaves moving by to the north
and west Tuesday and Wednesday putting a dent in the upper level
ridge. The ECMWF is much weaker with these features. Both models
show an increase in low level onshore flow on Tuesday which will
knock a few degrees off the high temperatures. The low level
onshore flow pattern continues on Wednesday for a little more
cooling. Felton

Aviation An upper level trough will shift east of the region
today. Light southwest flow aloft becoming northwesterly this
afternoon and tonight. Air mass generally stable. Moist in the lower
levels and periods of scattered to broken high clouds through
tonight. Widespread MVFR stratus this morning. Isolated ifr
conditions could also develop along the coast and portions of the sw
interior and kitsap peninsula. Improvement toVFR should occur by
18z. Partial clearing late in the day with only patchy low clouds
early Friday morning.

Ksea... Northeasterly wind 4-8 kt becoming variable to 5 kt 13-17z,
then northwesterly 4-8 kt after 17z. MVFR stratus should improve to
vfr by 18z.

Marine Onshore flow will gradually ease as a trough moves east of
the region later today and tonight. Westerly small craft winds in
the central east strait may ease below 20 kt for a few hours later
this morning and early afternoon. Diurnal westerly winds should pick
up again late in the day and this evening. Decided to run the small
craft through tonight but indicate a lull in winds around midday.

Small craft winds will also extend to the waters adjacent to the
eastern strait with a lull in winds at times.

Light northerly flow will prevail Friday through this weekend, with
the flow trending weakly offshore on Monday. Dtm

Climate Since records started at seattle-tacoma airport in 1945
the driest july and august is 0.03 inches in 1967. So far in 2017
the july and august total rainfall is 0.02 inches.

The streak of days with highs 70 degrees or more in seattle is
now up to 56 in a row, six short of the record 62 days set in
2015. Felton

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory until 5 am pdt Friday for admiralty inlet-
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.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 9 mi50 min WNW 8 G 9.9
TCNW1 - 9446484 - Tacoma, WA 10 mi56 min 62°F 56°F1016.3 hPa
EBSW1 - 9447130 - Seattle, WA 15 mi50 min W 2.9 G 4.1 61°F 56°F1016.5 hPa
46121 16 mi47 min 3.9 60°F 1015.6 hPa52°F
WPOW1 - West Point, WA 18 mi38 min ENE 7 G 8.9 60°F 1016.3 hPa (+0.5)47°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, WA8 mi45 minNNE 1010.00 miOvercast62°F48°F62%1016.8 hPa
Tacoma, Tacoma Narrows Airport, WA11 mi45 minSW 510.00 miOvercast59°F53°F81%1016.4 hPa
Boeing Field - King County International Airport, WA12 mi45 minno data10.00 miOvercast62°F50°F65%1016.3 hPa
Renton Municipal Airport, WA14 mi45 minNNW 910.00 miOvercast62°F51°F67%1016.5 hPa
Bremerton, Bremerton National Airport, WA17 mi1.7 hrsENE 53.00 miFog/Mist59°F55°F90%1017.6 hPa
Tacoma / McChord Air Force Base, WA17 mi1.7 hrsSSW 810.00 miOvercast62°F60°F96%1016.1 hPa
Pierce County-Thun Field, WA22 mi63 minWNW 610.00 miOvercast63°F59°F88%1016.3 hPa
Fort Lewis / Gray U. S. Army Airfield, WA22 mi1.7 hrsS 810.00 miOvercast61°F58°F91%1016.2 hPa

Wind History from SEA (wind in knots)
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Last 24hrS4SW3CalmS3SE453S6SW9SW5W75W4NW4NW4N6N5W3W4W4NW4N8NE8N10
1 day agoNE4NW4CalmCalmNW3W3W443W7W5SW6SW5SW6SW7S5W4SW6SW8S8S8SW4S3S3
2 days agoN7N7N8N5N8N6NW4NW3N7N9N10N9N7N9
G15
N14N10N8N7N11N10NE8N7N6N6

Tide / Current Tables for Burton, Quartermaster Hbr. (inside), Vashon I., Puget Sound, Washington
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Burton
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Thu -- 01:25 AM PDT     3.22 feet Low Tide
Thu -- 06:18 AM PDT     Sunrise
Thu -- 07:02 AM PDT     10.94 feet High Tide
Thu -- 09:34 AM PDT     Moonrise
Thu -- 01:22 PM PDT     0.56 feet Low Tide
Thu -- 07:54 PM PDT     12.28 feet High Tide
Thu -- 08:04 PM PDT     Sunset
Thu -- 09:47 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.53.33.44.76.68.710.310.910.48.96.74.11.90.70.92.44.97.710.211.812.311.610.17.8

Tide / Current Tables for Skagit Bay, 1 mile S of Goat Island, Washington Current
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Skagit Bay
Click for Map
Thu -- 01:21 AM PDT     1.85 knots Max Flood
Thu -- 04:59 AM PDT     -0.01 knots Slack
Thu -- 06:18 AM PDT     Sunrise
Thu -- 07:54 AM PDT     -1.55 knots Max Ebb
Thu -- 09:35 AM PDT     Moonrise
Thu -- 10:57 AM PDT     0.02 knots Slack
Thu -- 01:40 PM PDT     2.02 knots Max Flood
Thu -- 05:32 PM PDT     -0.07 knots Slack
Thu -- 08:04 PM PDT     Sunset
Thu -- 08:23 PM PDT     -1.56 knots Max Ebb
Thu -- 09:47 PM PDT     Moonset
Thu -- 11:35 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.81.81.61.1-0-1.1-1.5-1.6-1.4-1.10.21.41.921.81.40.8-0.8-1.3-1.5-1.5-1.3-0.8

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 (6,6,7,8)
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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.