Sunday, April30, 2017 L-36.com


Marine Weather and Tides
Keyport, WA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 5:51AMSunset 8:24PM Sunday April 30, 2017 7:57 AM PDT (14:57 UTC) Moonrise 8:44AMMoonset 12:00AM Illumination 21% Phase: Waxing Crescent; Moon at 5 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- 633 Am Pdt Sun Apr 30 2017
Today..SW wind 15 to 25 kt easing to 10 to 20 kt early...becoming 5 to 15 kt in the afternoon. Wind waves 2 to 4 ft...subsiding to 1 to 3 ft. A chance of showers.
Tonight..SW wind 5 to 15 kt...except nw wind N of seattle in the evening. Wind waves 2 ft or less. A chance of showers in the evening then a slight chance of showers after midnight.
Mon..SW wind to 10 kt. Wind waves 1 ft or less. A chance of showers in the morning then a slight chance of showers in the afternoon.
Mon night..NW wind to 10 kt in the evening becoming light. Wind waves 1 ft or less.
Tue..Light wind becoming S to 10 kt in the afternoon. Wind waves 1 ft or less.
Tue night..SW wind to 10 kt becoming S 5 to 15 kt after midnight. Wind waves 2 ft or less.
Wed..S wind 5 to 15 kt becoming n. Wind waves 2 ft or less.
Thu..NW wind to 10 kt. Wind waves 1 ft or less.
PZZ100 633 Am Pdt Sun Apr 30 2017
Synopsis for the northern and central washington coastal and inland waters..Moderate onshore flow today will gradually ease tonight. Weaker onshore flow will generally prevail this week. A front may increase southerly winds over the coastal waters around Tuesday night.

7 Day Forecast for Marine Location Near Keyport CDP, WA
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location: 47.7, -122.63     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 301025
afdsew
area forecast discussion
national weather service seattle wa
325 am pdt Sun apr 30 2017

Synopsis Scattered showers remain possible throughout the day
today over the area in the wake of a passing cold front. A weak
weather system passing to the south of the area may result in light
showers Monday. Upper level ridging will bring mostly dry conditions
Tuesday through Thursday although some locations may see brief light
rain. The leading edge of an upper level trough will bring a return
to rain starting Thursday night with the trough expected to pass
through the area for next weekend.

Short term Radar this morning is pretty quiet with possibly some
light showers along the coast but otherwise activity seems to be
relegated elsewhere. Not unexpectedly... Clouds remain in place over
w wa.

A weak shortwave will linger over the area today allowing for the
chance of showers to persist. On top of that... Models continue to
suggest the development of a puget sound convergence zone this
afternoon. However... Models do not really agree on where to place
it... The NAM has it over central king co... The hrrr has it over the
king/snohomish co line... And the GFS puts it over central snohomish.

Thus... Have opted to paint forecast in broad strokes to cover this.

Some weak upper level ridging looks to taper activity off tonight
and into Monday.

Would like to advertise Monday as a dry day... And for some locations
it may well be... But models over the past 24 hours have shown a
weakening shortwave within the ridge that looks to bring a chance
for showers before dipping southward and taking any activity along
with it. By Monday night... Said ridging will continue to intensify
but do not get too excited. GFS and ECMWF have completely flip-
flopped on their solutions for Tuesday into Wednesday. Previous gfs
runs showed a system approaching but moving just to the north of the
area while previous ECMWF solutions showed the system failing to
pull up in time and as such... Bringing some rain to the area. Now
the GFS shows a wet solution and the ECMWF is showing drier.

Apparently the motto for this spring is that we simply cannot have
nice things. With more than just a little feeling of defeat... Have
opted to up pops slightly for the tues/weds time frame to allow for
slight chance to low end chance pops to enter into the forecast. Smr

Long term Maintaining the aforementioned reversal... GFS now wants
to go with a dirty ridge over W wa for weds that would still allow
for showers while the ECMWF remains dry. On the bright side... The
two converge on the solution that the ridging will continue to
intensify Thursday with dry conditions from both models. This ridge
intensification could also lead to many interior locations seeing
their first 70 degree day either Wed or thu. As the end of the
upcoming week approaches... Models agree an upper level low over the
pacific will begin to impact the area starting Friday and into the
weekend. The ECMWF follows a pretty rational... Standard approach of
an upper low that W wa has seen many... Many times as of late. The
gfs however throws in a line of precip well ahead of the leading
edge of this trough with seemingly only a minor shortwave to justify
it. Cannot really see biting on to that solution at this time... But
did nudge pops up slightly in this time period. Would hope models
get their bits together for future runs because due to current
waffling nature... Have a hard time putting a great deal of
confidence in any current solutions. Smr

Aviation Moderate westerly flow aloft becoming light
northwesterly this afternoon through tonight. Generally moist air
mass and weakly unstable in the lower levels. Showers generally
decreasing today, except for a puget sound convergence zone from
kpae to just north of ksea/kbfi, possibly reaching the kbfi terminal
by early this evening before dissipating. Mostly MVFR stratus with
local ifr and light showers or drizzle. CIGS generally improving to
vfr by late morning with scattering clouds some places, except MVFR
still possible where any convergence zone develops.

Ksea... Southwesterly 12-15 kt w/ gusts 24 kt, becoming more westerly
and easing to 8-12 knots by late this afternoon and evening. The
convergence zone may approach the terminal from the north by early
evening. There is a 25 percent chance a northerly wind shift at the
ksea terminal this evening, with a better chance of north wind to 10
kt at kbfi. Opposing flow at ksea/kbfi is possible in this
scenario, with best chance between 23z-04z this evening. Dtm

Marine Moderate post frontal onshore flow will prevail today,
gradually easing tonight. Residual small craft winds over the
coastal waters, western strait, and puget sound will ease this
morning. Stronger westerly winds to 30 kt will continue in the
central/eastern strait, easing after midnight. Small craft
advisories remain up through tonight for the central/eastern strait
and also for portions of the north inland waters and admiralty inlet
near the east entrance to the strait. While winds will ease in puget
sound, a switch from south-southwesterly to a northerly direction is
expected across the north sound later this morning, reaching close
to around seattle this afternoon and evening. Dtm

Sew watches/warnings/advisories
Wa... None.

Pz... Small craft advisory all waters.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WPOW1 - West Point, WA 11 mi57 min S 11 G 11 48°F 1022.3 hPa (+1.2)44°F
EBSW1 - 9447130 - Seattle, WA 17 mi45 min S 5.1 G 8.9 49°F 48°F1022.8 hPa
46121 29 mi1426 min 9.7 47°F 1022.4 hPa42°F
PTWW1 - 9444900 - Port Townsend, WA 29 mi45 min SW 8.9 G 13 48°F 49°F1023.3 hPa
TCMW1 - 9446482 - Tacoma Met, WA 31 mi45 min SW 6 G 12
TCNW1 - 9446484 - Tacoma, WA 32 mi45 min 49°F 46°F1023.5 hPa
SISW1 - Smith Island, WA 44 mi57 min SW 21 G 24 47°F 1022.2 hPa (+2.7)

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bremerton, Bremerton National Airport, WA17 mi61 minSW 710.00 miOvercast45°F43°F93%1024.3 hPa
Seattle, Seattle Boeing Field, WA21 mi64 minS 610.00 miOvercast48°F46°F93%1022.7 hPa
Everett Snohomish County, WA24 mi64 minNNW 410.00 miMostly Cloudy45°F42°F90%1022.5 hPa

Wind History from PWT (wind in knots)
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SW11SW9SW8SW5SW5S9SW9SW9SW7CalmSW9SW7
1 day ago--------SE433E6SE7CalmNE5NE4NE3E3CalmCalmCalmCalmNE3CalmCalmCalmCalmCalm
2 days ago------------------------------------------------

Tide / Current Tables for Poulsbo, Liberty Bay, Washington
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Poulsbo
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Sun -- 12:19 AM PDT     Moonset
Sun -- 02:31 AM PDT     5.82 feet Low Tide
Sun -- 05:54 AM PDT     Sunrise
Sun -- 07:45 AM PDT     11.14 feet High Tide
Sun -- 09:44 AM PDT     Moonrise
Sun -- 02:44 PM PDT     -1.89 feet Low Tide
Sun -- 08:21 PM PDT     Sunset
Sun -- 10:09 PM PDT     12.31 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.97.165.96.88.39.810.911.110.38.45.930.3-1.5-1.8-0.81.54.37.39.911.612.312

Tide / Current Tables for West Point, Seattle, 0.3 miles W of, Washington Current
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West Point
Click for Map
Sun -- 12:19 AM PDT     Moonset
Sun -- 03:08 AM PDT     0.00 knots Slack
Sun -- 05:09 AM PDT     0.41 knots Max Flood
Sun -- 05:54 AM PDT     Sunrise
Sun -- 07:33 AM PDT     -0.00 knots Slack
Sun -- 09:44 AM PDT     Moonrise
Sun -- 11:13 AM PDT     -1.09 knots Max Ebb
Sun -- 02:56 PM PDT     0.01 knots Slack
Sun -- 06:09 PM PDT     1.17 knots Max Flood
Sun -- 08:21 PM PDT     Sunset
Sun -- 10:01 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.7-0.6-0.3-00.30.40.40.2-0.2-0.6-0.9-1.1-1-0.8-0.400.611.21.10.80.50-0.4

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 (10,2,3,4)
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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.