Thursday, February22, 2018 L-36.com


Marine Weather and Tides
Bryn Mawr-Skyway, 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 6:58AMSunset 5:46PM Thursday February 22, 2018 5:59 PM PST (01:59 UTC) Moonrise 10:37AMMoonset 12:17AM Illumination 53% Phase: First Quarter Moon; Moon at 8 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- 249 Pm Pst Thu Feb 22 2018
Tonight..N wind 10 to 20 kt becoming S 5 to 15 kt after midnight. Wind waves 1 to 3 ft.
Fri..S wind 10 to 20 kt rising to 15 to 25 kt in the afternoon. Wind waves 2 to 4 ft. Snow likely in the afternoon.
Fri night..S wind 15 to 25 kt. Wind waves 2 to 4 ft. Rain likely in the evening then rain after midnight.
Sat..Variable wind 5 to 15 kt. Wind waves 2 ft or less.
Sat night..S wind 5 to 15 kt rising to 20 to 30 kt after midnight. Wind waves 2 ft or less building to 3 to 5 ft after midnight.
Sun..W wind 15 to 25 kt. Wind waves 2 to 4 ft.
Sun night..SW wind 5 to 15 kt. Wind waves 2 ft or less.
Mon..Light wind becoming S to 10 kt. Wind waves 1 ft or less.
Tue..S wind 5 to 15 kt becoming 10 to 20 kt. Wind waves 1 to 3 ft.
PZZ100 249 Pm Pst Thu Feb 22 2018
Synopsis for the northern and central washington coastal and inland waters..Moderate northerly flow will ease this evening and turn southerly tonight, as a weak ridge moves southeast across the waters. A frontal system will move southeast across the region Friday afternoon and night. A more vigorous system will move across the area Saturday night and Sunday with gales possible. A weaker front will arrive Tuesday.

7 Day Forecast for Marine Location Near Bryn Mawr-Skyway, WA
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location: 47.52, -122.26     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 222350
afdsew
area forecast discussion
national weather service seattle wa
350 pm pst Thu feb 22 2018

Synopsis Cold and sometimes unsettled northwest flow aloft will
continue into the middle of next week. The next system will move
southeast across western washington on Friday and Friday night,
with lowland snow transitioning to rain. Moderate to heavy
mountain snow is expected into Saturday morning. Another cold wet
system will dive in late Saturday night and Sunday, with another
round of moderate to heavy mountain snow, along with some
localized areas of lowland snow. A dry lull is possible late
Monday, before conditions become unsettled again from late Tuesday
through next Thursday.

Short term Northwest flow aloft will continue through early
next week. For today, a shortwave ridge is crossing the area, and
cold dry continental air continues to pour out of the fraser
valley past bellingham, reinforcing the cold and dry air mass in
place. With clear skies for most of tonight, will be cold and
frosty with another hard freeze. Many of the colder spots in
southwest washington will drop into the teens tonight.

The next shortwave will dive down the b.C. Coast on Friday, with
a secondary wave on its heels crossing the area early Saturday
morning. Westerly low-level flow in advance of Friday's shortwave
will advect warmer maritime air onshore. The warm advection lift
will bring about precip. Precip will spread southeast down the
b.C. Coast on Friday morning, reaching the northwest olympic
peninsula by late morning, then spreading across the rest of
western washington on Friday afternoon. Cold air mass will cause
precip to start as snow. Along the coast, precip will quickly
change to rain just an hour or two after beginning. Along the i-5
corridor from the everett area on south, precip will change to
rain early Friday evening, after an inch or so of snow has
occurred. With onshore flow, orographic lift will enhance precip
over the mountains. In the cascades, this could be an advisory-
level snow event.

By the time the secondary trailing shortwave arrives early
Saturday morning, most of the lowlands will be warm enough for
merely cold rain, though snow could linger in the eastern
lowlands, i.E. The cascade foothill communities. With another
enhancement of precip late Friday night, this could really cause
the snow to pile up both in the mountains and in some of the
cascade foothill communities. While it will be raining along most
of i-5, foothill communities like north bend, gold bar and sedro
woolley could pick up a few more inches of snow late Friday
night. Once the shortwave exits later Saturday morning, the air
mass will cool down some again, with snow level down to 300-500
feet by mid-day Saturday. Post-frontal showers are possible,
especially in a puget sound convergence zone and the mountains.

A short lull in precip is expected late Saturday, then a colder
and more vigorous trough will dive southeast along the b.C. Coast,
spreading precip into western washington on Sat night. Moderate to
heavy snow is expected in the mountains, given cold onshore flow.

After the attendant cold front passes Sunday morning, snow level
will drop back into the 500-1000 foot range with an abundance of
convective showers in cold northwest onshore flow. Mesoscale
models really point to inland portions of the north coast (such as
forks) getting a shot of heavy snow, though cascade foothill
communities could also get more snow. Will have to watch for any
persistent puget sound convergence zone, which could locally drop
snow level further and bring accumulations on hills north of
seattle. Haner

Long term A longwave trough over the western u.S. Will continue
to bring cold northwest flow until wed. A shortwave ridge within
this flow around Mon night or Tue could bring a dry period. The
official forecast simply reflects this with a decrease to low
chance pops for now. The longwave pattern should retrograde next
wed and thu, pushing the longwave trough axis either to the u.S.

West coast or just offshore. With the trough axis either overhead
or just offshore on Wed and thu, the theme of low snow levels and
showery weather will re-emerge. Haner

Aviation Northerly flow aloft over western washington this
afternoon will increase tonight, then back to northwest late
tonight and continue Friday. The air mass will be generally dry
tonight, with moisture increasing Friday as the next frontal
system moves into the region. At the surface moderate northerly
flow will continue today, ease this evening, and turn southerly
late tonight.

Western washington hadVFR conditions with no ceiling at 3 pm, and
there should be no significant cloud cover below 12,000 ft through
tonight. Conditions will deteriorate Friday as the next frontal
system approaches and moves into the forecast area. Widespread
low-end MVFR to local ifr conditions are likely Friday afternoon or
evening with snow or snow rain across the area.

Ksea... North wind 7-13 kt easing to 4-8 kt this evening and
switching to southerly around midnight; southerly wind rising to
10-16 kt in the afternoon. There should be no significant cloud
cover below 12,000 ft tonight. Conditions will lower Friday,
eventually becoming low-end MVFR or possibly ifr at times. Ksea
is likely to receive about 1 inch of snow, probably between 2 pm
and 8 pm Friday. Mcdonnal

Marine Moderate northerly flow will ease this evening and turn
southerly tonight, as a weak ridge moves southeast across the
waters. A frontal system will move southeast across the region
Friday afternoon and night. This system should bring solid small
craft advisory winds to all marine zones, both with the
southerlies ahead of the system and the west to northwest flow
following it. Brief gales in the post-frontal westerlies in the
central and eastern strait of juan de fuca are not out of the
question.

A more vigorous system will move across the area Saturday night
and Sunday. There is a better possibility of gales with this
system, especially over the coastal waters and in the central and
eastern strait of juan de fuca in the post-frontal westerly flow.

A weaker front will arrive Tuesday. Mcdonnal

Hydrology River flooding is not expected the next 7 days.

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory from 6 am Friday to noon pst Saturday 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 6 am Friday to 6 pm pst Saturday 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 6 pm pst this evening for northern
inland waters including the san juan islands.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EBSW1 - 9447130 - Seattle, WA 7 mi41 min NW 6 G 12 38°F 46°F1028.6 hPa
WPOW1 - West Point, WA 14 mi59 min N 17 G 19 38°F 1028.3 hPa (+0.5)13°F
46120 18 mi46 min NNW 12 38°F 1028 hPa17°F
TCNW1 - 9446484 - Tacoma, WA 19 mi41 min 37°F 44°F1028.5 hPa
TCMW1 - 9446482 - Tacoma Met, WA 19 mi41 min NNE 12 G 16
46121 30 mi35 min 39°F 1028.5 hPa19°F
PTWW1 - 9444900 - Port Townsend, WA 49 mi41 min WNW 5.1 G 9.9 38°F 46°F1029.5 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, WA2 mi66 minVar 510.00 miFair38°F15°F39%1028.2 hPa
Renton Municipal Airport, WA3 mi66 minNW 910.00 miFair38°F16°F41%1028.6 hPa
Seattle, Seattle-Tacoma International Airport, WA6 mi66 minNNW 1010.00 miA Few Clouds37°F16°F42%1028.6 hPa
Tacoma, Tacoma Narrows Airport, WA24 mi66 minN 10 G 1910.00 miFair36°F12°F39%1028.2 hPa

Wind History from BFI (wind in knots)
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Last 24hrSE10SE7SE6SE6SE6E4CalmCalmN5N44N46NE4NE5NE44N7N76
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1 day agoN6N4N3NE3NE3NE3CalmCalmCalmCalmSE3CalmCalmSE3S5SE5SE8SE6SW6S6S4S7S8SE7
2 days agoCalmCalmCalmCalmSE6SE4SE4SE6SE4SE4CalmSE3CalmSE3SE4SE4SE3S43CalmCalm3N6N4

Tide / Current Tables for Duwamish Waterway, Washington
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Duwamish Waterway
Click for Map
Thu -- 12:17 AM PST     Moonset
Thu -- 03:01 AM PST     4.55 feet Low Tide
Thu -- 07:02 AM PST     Sunrise
Thu -- 08:56 AM PST     11.07 feet High Tide
Thu -- 10:37 AM PST     Moonrise
Thu -- 04:08 PM PST     1.24 feet Low Tide
Thu -- 05:43 PM PST     Sunset
Thu -- 10:42 PM PST     8.96 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.15.954.656.27.99.510.611.110.69.27.45.33.41.91.21.62.84.56.37.98.88.9

Tide / Current Tables for Restoration Point, 0.6 miles ESE of, Washington Current
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Restoration Point
Click for Map
Thu -- 12:17 AM PST     Moonset
Thu -- 12:33 AM PST     -0.53 knots Max Ebb
Thu -- 03:56 AM PST     0.00 knots Slack
Thu -- 05:52 AM PST     0.36 knots Max Flood
Thu -- 07:03 AM PST     Sunrise
Thu -- 08:54 AM PST     -0.00 knots Slack
Thu -- 10:37 AM PST     Moonrise
Thu -- 12:56 PM PST     -0.88 knots Max Ebb
Thu -- 05:04 PM PST     0.00 knots Slack
Thu -- 05:44 PM PST     Sunset
Thu -- 07:09 PM PST     0.45 knots Max Flood
Thu -- 10:46 PM PST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.5-0.5-0.4-0.200.30.40.30.2-0-0.3-0.6-0.8-0.9-0.8-0.6-0.3-00.30.50.40.30.1-0.1

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 (20,4,5,8)
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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.