Wednesday, June20, 2018 L-36.com


Marine Weather and Tides
Mirrormont, WA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:08AMSunset 9:11PM Wednesday June 20, 2018 6:25 AM PDT (13:25 UTC) Moonrise 12:26PMMoonset 12:31AM Illumination 46% 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- 253 Am Pdt Wed Jun 20 2018
Today..Variable wind to 10 kt becoming nw in the afternoon. Wind waves 1 ft or less.
Tonight..SW wind 5 to 15 kt, except N wind 5 to 15 kt seattle northward this evening. Wind waves 2 ft or less.
Thu..SW wind 5 to 15 kt. Wind waves 2 ft or less.
Thu night..Variable wind 5 to 15 kt becoming se after midnight. Wind waves 2 ft or less.
Fri..S wind 5 to 15 kt becoming ne in the afternoon. Wind waves 2 ft or less.
Fri night..N wind to 10 kt becoming S after midnight. Wind waves 1 ft or less.
Sat..Light wind becoming N to 10 kt. Wind waves 1 ft or less.
Sun..N wind 5 to 15 kt. Wind waves 2 ft or less.
PZZ100 253 Am Pdt Wed Jun 20 2018
Synopsis for the northern and central washington coastal and inland waters..Weak onshore flow will become moderate to strong late this afternoon through tonight. Gale force winds are expected over the eastern two thirds of the strait of juan de fuca late this afternoon and tonight. Onshore flow will remain strong Thursday then slowly relax Friday and Saturday. Onshore flow is expected to increase again on Sunday.

7 Day Forecast for Marine Location Near Mirrormont, WA
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location: 47.47, -122     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 200944
afdsew
area forecast discussion
national weather service seattle wa
244 am pdt Wed jun 20 2018

Synopsis An upper ridge east of the cascades will bring another
day of near record high temperatures to western washington today,
with partly to mostly sunny skies and a chance of thunderstorms
late in the day. Onshore flow will bring cooler marine air inland
Thursday and Friday. High pressure aloft will cross the region
this weekend, followed by an upper trough early next week.

Short term The upper ridge over the pacific northwest continues
its slow eastward movement east of the cascades early this
morning, and as a result light southeast flow has developed over
western washington. There is a decent amount of high cloud cover
over the forecast area -- mainly debris from Tuesday's
thunderstorms over the cascades -- which has kept temperatures
rather mild overnight.

The upper ridge will continue to move slowly east today, and
southerly flow aloft will carry higher level moisture into the
forecast area ahead of a weak upper trough offshore. The air mass
will become increasingly unstable this afternoon and evening, and
all guidance points to a greater threat of thunderstorms than
previously thought. Model soundings for seattle, for example, show
a late afternoon mu parcel LI of around -4 with precipitable
water exceeding 1 inch. The NCEP guidance corroborates this,
showing a general thunderstorm threat from essentially the puget
sound eastward. So that's the big change to the forecast for this
afternoon and especially this evening.

The offshore upper trough will begin to move inland tonight. More
importantly, low level onshore flow will become moderately strong,
and we should have a good marine push tonight. Thursday should
begin with considerable low cloud cover, and probably some drizzle
at and near the coast, but the interior should become partly to
mostly sunny during the day. There could also be some spotty light
showers, mainly over the mountains. It will be considerably cooler
Thursday, with highs across the interior lowlands in the upper 60s
and 70s.

Another upper trough will move into western washington Thursday
night and Friday. This feature will be better defined, but will
only bring a chance of light showers to the area -- mainly the
coast, mountains, and eventually in the puget sound convergence
zone Friday evening. Friday will be a bit cooler yet, with highs
mainly in the mid 60s to lower 70s. Mcdonnal

Long term An upper trough will build as it progresses across
the offshore waters Friday and Friday night. It should reach the
pacific northwest coast Saturday, move into western washington
Saturday night and east of the cascades on Sunday. The ridge will
bring sunnier and warmer weather this weekend, especially Sunday.

A broad upper trough to our north should bring a return to cooler
weather, stronger onshore flow, partly sunny skies and a chance
of showers for Monday and Tuesday. Mcdonnal

Aviation Light southeast flow aloft will become south to
southwesterly today over western washington an upper ridge axis
shifts east of the region. The air mass has become somewhat moist in
the mid and upper levels and will become rather unstable as the day
goes on. A weak disturbance lifting northward through the area will
likely spark some convection after 21z and some of this may impact
the terminals around puget sound late this afternoon into the
evening. Low level onshore flow will become strong this evening and
will push a marine layer inland across much of the interior of
western washington for ifr or low MVFR ceilings Thursday morning.

Ksea...VFR expected through this evening. Models indicate a rather
unstable atmosphere developing for the late afternoon hours.

Although the steering flow favors keeping most thunderstorm activity
over the cascades, it seems wise to include a chance of a late
afternoon or evening thunderstorm in the terminal forecast as models
shows some pretty impressive instability numbers for the puget sound
area and a pretty good amount of precipitable water in the
atmosphere to work with. Onshore flow will increase dramatically
tonight and a marine layer with low MVFR or possible ifr ceilings
looks likely Thursday am. Light and variable surface winds becoming
w-sw 4 to 7 knots this afternoon then becoming southerly 7 to 12
knots late tonight. 27

Marine Weak onshore flow early this morning will become
moderate to strong late this afternoon and tonight as pressures
rise offshore and fall east of the cascades. A gale warning has
been issued for late this afternoon and tonight for the eastern
two thirds of the strait of juan de fuca, while small craft
advisories have been issued for the western portion of the strait,
admiralty inlet, and the northern inland waters.

Moderate to strong onshore pressure gradients will continue
Thursday into Thursday night, then will relax somewhat Friday
through early Sunday as a weak ridge of high pressure moves
across the waters. Onshore flow will increase again late Sunday.

Albrecht

Sew watches warnings advisories
Wa... None.

Pz... Gale warning from 5 pm this afternoon to 5 am pdt 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 5 pm this afternoon to 3 am pdt
Thursday for admiralty inlet-northern inland waters
including the san juan islands-west entrance u.S. Waters
strait of juan de fuca.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EBSW1 - 9447130 - Seattle, WA 20 mi37 min SSW 1 G 1.9 54°F1014.8 hPa
TCNW1 - 9446484 - Tacoma, WA 26 mi43 min 62°F 53°F1014.8 hPa
TCMW1 - 9446482 - Tacoma Met, WA 26 mi43 min WNW 4.1 G 4.1
WPOW1 - West Point, WA 27 mi85 min NE 8.9 G 11 56°F 1014.9 hPa (-0.5)54°F
46121 41 mi49 min 60°F 1014.6 hPa58°F
46125 45 mi31 min 9.7 53°F 1014.6 hPa52°F

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Renton Municipal Airport, WA12 mi32 minN 010.00 miFair66°F57°F75%1014.7 hPa
Boeing Field - King County International Airport, WA16 mi32 minNW 410.00 miPartly Cloudy61°F55°F81%1014.3 hPa
Seattle, Seattle-Tacoma International Airport, WA17 mi32 minN 010.00 miMostly Cloudy63°F55°F76%1015.1 hPa

Wind History from RNT (wind in knots)
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Last 24hrSW4S3S44N5NW4NW4S74S4CalmN4NW4N4CalmNW6CalmNW3CalmCalmCalmCalmCalmCalm
1 day agoSE3SE3SE35SE54NW5N5NW4SW6CalmSW4S5S8S5S7S6S6S6S8S5S6S4SE3
2 days agoCalmNW3CalmN3W5N5NW8NW9NW10NW8NW8NW10NW6NW6CalmNW3S4SE4CalmSE3S3SE3SE5SE3

Tide / Current Tables for Duwamish Waterway, Washington
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Duwamish Waterway
Click for Map
Wed -- 01:32 AM PDT     Moonset
Wed -- 03:52 AM PDT     First Quarter
Wed -- 05:11 AM PDT     Sunrise
Wed -- 06:05 AM PDT     3.85 feet Low Tide
Wed -- 11:09 AM PDT     7.64 feet High Tide
Wed -- 01:27 PM PDT     Moonrise
Wed -- 05:18 PM PDT     1.82 feet Low Tide
Wed -- 09:10 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.910.99.37.35.54.33.94.156.27.27.67.46.65.43.92.61.92.13.257.29.411

Tide / Current Tables for Restoration Point, 0.6 miles ESE of, Washington Current
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Restoration Point
Click for Map
Wed -- 01:33 AM PDT     Moonset
Wed -- 02:58 AM PDT     -0.86 knots Max Ebb
Wed -- 03:52 AM PDT     First Quarter
Wed -- 05:11 AM PDT     Sunrise
Wed -- 07:11 AM PDT     0.00 knots Slack
Wed -- 08:32 AM PDT     0.26 knots Max Flood
Wed -- 11:12 AM PDT     -0.00 knots Slack
Wed -- 01:28 PM PDT     Moonrise
Wed -- 02:46 PM PDT     -0.65 knots Max Ebb
Wed -- 06:09 PM PDT     0.00 knots Slack
Wed -- 08:38 PM PDT     0.62 knots Max Flood
Wed -- 09:10 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.2-0.5-0.8-0.9-0.8-0.6-0.3-00.20.20.20-0.2-0.4-0.6-0.6-0.5-0.3-00.30.60.60.50.3

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 (9,2,3,4)
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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.