Tuesday, November21, 2017 L-36.com


Marine Weather and Tides
Navy Yard City, 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 7:24AMSunset 4:29PM Tuesday November 21, 2017 4:05 AM PST (12:05 UTC) Moonrise 10:04AMMoonset 7:13PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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- 257 Am Pst Tue Nov 21 2017
Today..NE wind 5 to 15 kt becoming se in the afternoon. Wind waves 2 ft or less. Rain.
Tonight..S wind 10 to 20 kt. Wind waves 1 to 3 ft. Rain.
Wed..S wind 5 to 15 kt. Wind waves 2 ft or less. Rain likely.
Wed night..S wind 10 to 20 kt rising to 15 to 25 kt after midnight. Wind waves 2 to 4 ft.
Thu..SW wind 15 to 25 kt. Wind waves 2 to 4 ft.
Thu night..S wind 15 to 25 kt. Wind waves 2 to 4 ft.
Fri..S wind 15 to 25 kt becoming se to 10 kt. Wind waves 2 to 4 ft subsiding to 1 ft or less.
Sat..SE wind to 10 kt becoming S 15 to 25 kt. Wind waves 1 ft or less building to 2 to 4 ft.
PZZ100 257 Am Pst Tue Nov 21 2017
Synopsis for the northern and central washington coastal and inland waters..A strong warm front will move north through the waters this afternoon. Gale force winds are likely on the coast and at the west entrance ahead of the front, with small craft advisory strength winds elsewhere around the strait, the northern inland waters, and admiralty inlet. Strong south to southeast flow will continue Wednesday through next weekend as a series of fronts and low pressure systems move through the waters or by to the west. Each of the system has the potential to produce gale force winds over portions of the waters.

7 Day Forecast for Marine Location Near Navy Yard City, WA
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location: 47.55, -122.65     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 211125
afdsew
area forecast discussion
national weather service seattle wa
325 am pst Tue nov 21 2017

Synopsis A subtropical plume of moisture will bring heavy rain
to western washington today and tonight, with the snow level near
8000 feet. After a relative break in the weather on Wednesday,
another wet frontal system will move through the region Wednesday
night and thanksgiving. There will be another break on Friday,
followed by more wet weather this weekend and into Monday.

Short term An upper ridge has been moving inland across the
pacific northwest overnight, but satellite imagery and radar show
the leading edge of the next plume of subtropical moisture moving
into western washington early this morning. Rain began at hoquiam
just before 3 am.

Precipitation will spread from southwest to northeast and cover
our entire forecast area within the next few hours, and then
continue into tonight as the southwesterly conveyor shifts slowly
eastward. The heaviest rain will probably occur from late morning
through afternoon, with the warm front passage, as 850 mb south-
southwest winds rise to around 70 kt. Precipitation should
decrease gradually later tonight. Snow levels will rise to around
8000 feet behind the warm front and remain near that level
tonight. Models have been fairly consistent with regard to
precipitation amounts; storm totals for today and tonight should
be roughly 2 to 5.5 inches over the olympics and mount rainier,
with 1 to 4 inches over the cascades north of mount rainier.

Warm moist southwest flow aloft will continue Wednesday, as
an upper trough digs into our far offshore waters outside of 135w.

There will be more rain on Wednesday, especially at the coast and
over the mountains, but it will be a relative break in the action.

Precipitation in the mountains will amount to another half inch to
inch, with the snow level still near 8000 feet.

The next frontal system will develop offshore on Wednesday, ahead
of the upper trough, and progress across western washington
Wednesday night and thanksgiving. The snow level will be around
7000 feet as the event starts, then lower to around 4000 feet
behind the front as precipitation decreases Thursday night. This
system doesn't look quite as wet, but it should bring another 1.5
to 3.5 inches of precipitation to the mountains with the heaviest
amounts over the olympics.

This will be a period of wet, but not especially windy, weather
for the lowlands. Three day rain totals of 2 to 4 inches are
likely at the coast with roughly 1 to 2.5 inches in the interior,
and according to USGS studies this could result in some
landslides. The warm air mass that will drive the snow level to
around 8000 feet will also be felt in the lowlands, especially on
Wednesday when high temperatures will be around 60 degrees.

Mcdonnal

Long term The models agree fairly well on the big picture in
the long term period, Friday through Monday. They show a short-
lived, relative break in the weather on Friday, then two frontal
systems in quick succession on Saturday and Sunday, followed by
cooler moist westerly flow on Monday. Confidence in model details
isn't very high, but I will increase pops somewhat for Saturday
through Sunday night. Mcdonnal

Hydrology A warm front and the plume of subtropical moisture
with it will bring 2 to 5.5 inches of rain to the olympics and
mount rainier today and tonight, and 1 to 4 inches of rain to the
cascades north of mount rainier. The snow level will be near 8000
feet. A second frontal system will bring another 1 to 4 inches on
Wednesday night and Thursday, with the snow level falling from
7000 feet to 4000 feet as the system moves through.

A flood watch is in effect for most of the forecast area. The
skokomish river, which only fell below flood stage Monday
evening, will almost certainly flood again late today or tonight.

In addition the northwest river forecast center models show
several rivers cresting near or just above flood stage including
the cowlitz, nisqually, white, snoqualmie, stillaguamish, skagit,
and nooksack. This doesn't mean the possibility of flooding is
limited to these rivers. Flooding on these rivers could begin
tonight or Wednesday. It looks like the threat is for a relatively
minor flooding episode.

In addition, the threat of landslides will increase across the
lowlands of western washington. The USGS landslide guidance shows
one or two stations near or just above the threshold of concern,
and of course the additional rain today and tonight and again
Wednesday and Thursday will drive that higher. Mcdonnal

Aviation Strong southwest flow aloft today through tonight. A
strengthening warm front extending westward from the central
oregon coast into a 990 mb low near 42n 134w will lift northward
across western washington this afternoon. Expect moisture to
rapidly spread into the area from the south this morning ahead of
the warm front, and for the moisture to remain over the area
behind the front tonight into Wednesday. The air mass will be
stable through tonight.

Low level northeasterly flow ahead of the front combined with
strengthening southerly flow aloft (south 30-40kt at 2000 ft)
will give low level wind shear this morning until the front passes
during the afternoon hours. With the exception of kclm, all
terminals are expected to see llws ahead of the warm front.

Conditions areVFR at most locations early this morning with some
lifr in fog at kolm. Expect all areas to become MVFR in ceilings
and precipitation -except for local ifr conditions at places like
kpwt- as the warm front approaches the area this morning. MVFR
conditions with rather low ceilings will continue behind the warm
front tonight, but rainfall rates and low level wind shear will
decrease from the south. Albrecht
ksea... GoodVFR conditions early this morning will rapidly
deteriorate to MVFR with CIGS 015-020 starting about 14z.

Southerly winds aloft will increase rapidly with the moisture with
flow below about 2000 ft msl remaining northeast to easterly.

Will continue to indicate llws in the terminals through mid
afternoon ahead of the warm front. Behind the front, low level
winds will become southeast to south 10-13kt and precipitation
will become lighter. Ceilings behind the front will likely stay
around 020. Albrecht

Marine A strengthening warm front extending westward from the
central oregon coast to a 990 mb low near 42n 134w will lift
north across the region this afternoon. Expect strong offshore
flow to develop this morning in advance of the warm front that
will give gale force winds to the west entrance to the strait of
juan de fuca and to the adjacent coastal waters. Small craft
advisory conditions can be expected in the central strait and
at locations around the east entrance in advance of the warm
front. Behind the front, strong gale force southerly winds can
be expected over the coastal waters this afternoon.

A frontal system west of the waters will give rather strong
southerly flow to the waters Wednesday and Wednesday night. Flow
will also be rather strong over the northern half of the inland
waters as flow aloft interacts with the olympics forming a mesolow
over or near the northeastern tip of the olympic peninsula. Rather
windy southerly flow will continue on Thursday as a trough south
of an offshore low pressure system brushes the area.

Latest model solutions show a developing low offshore moving by to
the west of the waters on Saturday. This will give windy
conditions to the area on Saturday.

While it will be windy over the next several days, confidence in
the timing and strength of individual features in this active
pattern is rather low. Widespread small craft advisory conditions
will be dominant while some features may produce gales at times,
especially over the coastal waters and at the entrances to the
strait of juan de fuca. Albrecht

Sew watches warnings advisories
Wa... Flood watch from this afternoon through Thursday afternoon for
admiralty inlet area-bellevue and vicinity-cascades of
pierce and lewis counties-cascades of snohomish and king
counties-cascades of whatcom and skagit counties-central
coast-east puget sound lowlands-eastern strait of juan de
fuca-everett and vicinity-hood canal area-lower chehalis
valley area-north coast-olympics-seattle and vicinity-
southwest interior-tacoma area-western skagit county-
western strait of juan de fuca-western whatcom county.

Pz... Small craft advisory for rough bar from 4 pm this afternoon to 4
pm pst Wednesday for grays harbor bar.

Gale warning until 4 pm pst this afternoon 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 noon today to 8 pm pst this evening
for admiralty inlet-east entrance u.S. Waters strait of
juan de fuca-northern inland waters including the san juan
islands.

Small craft advisory until 4 pm pst this afternoon for central
u.S. Waters strait of juan de fuca.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WPOW1 - West Point, WA 14 mi66 min Calm G 1.9 43°F 1017.4 hPa (-0.8)38°F
EBSW1 - 9447130 - Seattle, WA 17 mi48 min E 1 G 1.9 43°F 51°F1017.2 hPa
46121 19 mi44 min 5.8 44°F 1016.5 hPa40°F
46120 20 mi44 min SW 3.9 44°F 1016.3 hPa38°F
TCNW1 - 9446484 - Tacoma, WA 23 mi54 min 38°F 51°F1017 hPa
TCMW1 - 9446482 - Tacoma Met, WA 23 mi48 min SSE 2.9 G 4.1
PTWW1 - 9444900 - Port Townsend, WA 39 mi54 min NNW 1 G 6 45°F 49°F1017.2 hPa

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, WA8 mi70 minN 010.00 miMostly Cloudy35°F35°F100%1018.8 hPa
Boeing Field - King County International Airport, WA19 mi73 minN 010.00 miA Few Clouds38°F37°F97%1017 hPa
Tacoma, Tacoma Narrows Airport, WA20 mi73 minNNE 310.00 miMostly Cloudy41°F39°F96%1017 hPa
Seattle, Seattle-Tacoma International Airport, WA20 mi73 minNNW 310.00 miMostly Cloudy39°F37°F96%1017.4 hPa
Renton Municipal Airport, WA23 mi73 minSSE 310.00 miOvercast38°F37°F100%1017.5 hPa

Wind History from PWT (wind in knots)
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Last 24hrSW8S4CalmN4E4SE3CalmS5SW4S6S63E5NE8NE6NE4NE3CalmCalmCalmCalmNE3CalmCalm
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2 days agoSW7SW6SW7SW5S4S3S5SW4SW6W6S6S4SE3CalmS4CalmS3S5S7SW6SW7SW7SW9SW11

Tide / Current Tables for Bremerton, Washington
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Bremerton
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Tue -- 12:13 AM PST     -0.68 feet Low Tide
Tue -- 07:24 AM PST     Sunrise
Tue -- 07:31 AM PST     12.25 feet High Tide
Tue -- 10:03 AM PST     Moonrise
Tue -- 01:01 PM PST     6.64 feet Low Tide
Tue -- 04:27 PM PST     Sunset
Tue -- 05:39 PM PST     10.13 feet High Tide
Tue -- 07:13 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.6-0.21.43.86.69.311.212.112.211.4108.47.16.6789.19.910.19.47.95.93.71.5

Tide / Current Tables for Port Washington Narrows, North Entrance of, Washington Current
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Port Washington Narrows
Click for Map
Tue -- 12:34 AM PST     0.00 knots Slack
Tue -- 04:28 AM PST     3.46 knots Max Flood
Tue -- 07:24 AM PST     Sunrise
Tue -- 08:40 AM PST     -0.00 knots Slack
Tue -- 10:03 AM PST     Moonrise
Tue -- 11:50 AM PST     -1.55 knots Max Ebb
Tue -- 02:00 PM PST     0.00 knots Slack
Tue -- 04:10 PM PST     0.57 knots Max Flood
Tue -- 04:27 PM PST     Sunset
Tue -- 06:23 PM PST     -0.00 knots Slack
Tue -- 07:12 PM PST     Moonset
Tue -- 11:05 PM PST     -2.36 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.10.61.92.93.43.42.920.8-0.3-1-1.4-1.5-0.9-00.40.60.50.2-0.3-1-1.6-2.1-2.4

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 (7,2,3,4)
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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.