Monday, November20, 2017 L-36.com


Marine Weather and Tides
Black Diamond, 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 7:20AMSunset 4:28PM Monday November 20, 2017 1:32 AM PST (09:32 UTC) Moonrise 9:08AMMoonset 6:25PM Illumination 3% 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- 1154 Pm Pst Sun Nov 19 2017
Tonight..S wind 5 to 15 kt. Wind waves 2 ft or less. Rain.
Mon..Variable wind 5 to 15 kt. Wind waves 2 ft or less. A chance of rain in the morning.
Mon night..SW wind to 10 kt becoming ne after midnight. Wind waves 1 ft or less. Rain likely after midnight.
Tue..N wind to 10 kt becoming se 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Tue night..S wind 5 to 15 kt. Wind waves 2 ft or less.
Wed..S wind 5 to 15 kt. Wind waves 2 ft or less.
Wed night..S wind 10 to 20 kt rising to 15 to 25 kt after midnight. Wind waves 2 to 4 ft.
Thu..S wind 15 to 25 kt easing to 10 to 20 kt. Wind waves 2 to 4 ft.
Fri..S wind 10 to 20 kt becoming 5 to 15 kt. Wind waves 1 to 3 ft.
PZZ100 1154 Pm Pst Sun Nov 19 2017
Synopsis for the northern and central washington coastal and inland waters..Light nw flow will follow the front that passed through the area this evening. A high pressure center will pass across the waters on Monday. A strong warm front will push northward through the waters on Tuesday, preceded by strong offshore flow with gales possible near the west entrance. The warm front will be followed by southerly flow on Wednesday. Strong low pressure over the northeast pacific will maintain southerly flow on Thu and Fri.

7 Day Forecast for Marine Location Near Black Diamond, WA
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location: 47.3, -122     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 200533 rra
afdsew
area forecast discussion
national weather service seattle wa
915 pm pst Sun nov 19 2017

Synopsis A vigorous front will move slowly through western
washington late tonight and early Monday morning. Winds will ease
Monday with some lingering light rain gradually ending. A
strong warm front will arrive Tuesday with more rain and breezy
winds. The middle of the week will be mild, rainy, and perhaps
windy at times.

Short term Wv imagery and msas surface analysis show a closed 998
mb low off the central washington coast this evening. Buoy obs match
up exactly with the pressure center. Gradients have turned more
southeasterly and winds are gradually easing even though the low
that formed along the front is still not onshore. Some models hinted
at this development but other models missed it and would have pushed
the front through quicker. Wind advisories will probably be
allowed to expire later this evening, although some gusts are still
close to 45 mph in a couple spots around admiralty inlet. These
winds should ease shortly.

One big mystery is the lack of warming given the strong southerly
flow over 50 kt that was expected to penetrate the interior. It
appears the strong flow made it over lowland areas as a few spots up
north hit high wind or close to it. Models were terribly
inconsistent with the amount of warm air expected to reach the
cascades today and tonight, which should have caused the snow
levels to rise. The problem now is the closed low off the coast
moving so slowly and possibly cutting off some of the warm
advection. It is pretty clear the north cascades will get a lot of
snow by Monday morning with nearly a foot already at mount baker.

The passes are still surprisingly cold and models are too fast in
warming the air mass. However, I still think there is a good chance
that snow levels will finally rise above 5000 to 6000 feet across
the cascades of lewis pierce counties with a change over to rain in
the passes still expected but later than was forecast. Went with a
winter weather advisory, except up north where 1-2 feet are possible
by morning. Pass travel could be very difficult the next several
hours will heavy snow at times before the transition to rain
hopefully occurs not long after midnight. A few inches have already
fallen at snoqualmie and stevens pass.

00z models show more precipitation lingering into Monday, but still
tapering off. There could be a convergence zone in the afternoon in
the typical north seattle-everett corridor. Then a brief break or
lull in rain is possible from afternoon to the evening hours. The
next warm front will bring rain back to the area late Monday night
through Tuesday. This system should bring much milder air into the
area with highs possibly close to 60 Tuesday and Wednesday. Models
have trended somewhat lower with rain amounts in the cascades. The
flow aloft is not typically conducive for rain amounts that cause
river flooding. However, a lot of uncertainty still exists and the
river forecasts should be followed closely this week. See the
latest flood statements and hydro section below for further
details. Mercer

Long term From previous discussion... After a pretty decent round
of rain Tuesday and Tuesday night--with some heavy rain in the
mountains, the heavy precip will be north of the area on Wednesday.

There will still be rain at times over western washington--but this
lull on Wed will help a great deal with the rivers. Then on Thursday
the rainfall picks up again--but precip amounts in the models are
actually pretty modest. Still, the RFC forecasts show pretty high
rivers midweek, so a hydrologic outlook was issued, but it merely
highlights the uncertainty in the forecast at this time.

Aviation A cold front is gradually moving southeast across the
area this evening, but a wave moving northeast along the frontal
band will slow the front somewhat through late tonight. At the
upper levels, a developing upper low offshore will move eastward
along the canadian border on Monday. Strong southwest flow aloft
tonight will ease and become moderate to light westerly on Monday.

Rain will ease to showers from the northwest late tonight into
Monday morning and will be followed by mountain showers and a
puget sound convergence zone on Monday. The air mass will be moist
tonight with some drying along the coast and in the lowlands away
from the convergence zone during the day on Monday. Conditions
will gradually degrade to mainly lower end MVFR tonight and Monday
morning as the winds aloft ease, then will become mainlyVFR with
MVFR limited to showers and the convergence zone on Monday.

Conditions will dry further Monday evening as weak high pressure
moves across the area. Albrecht
ksea... CIGS near 040 early this evening will generally deteriorate
to bkn015 later tonight into Monday morning as pressure gradients
across the area weaken with the incoming front and low pressure
trough. Winds 19050kt at 020 and 21060kt at 050 will ease rapidly
around 08z as the front weakens over the area. Convergence zone
activity is expected to hang up north of the terminal (near or
just north of kbfi) during the day Monday giving light opposing
winds around the terminal area. Ceilings will slowly lift and
become mainlyVFR Monday afternoon or evening. Albrecht

Marine A cold front will move southeast through the
washington waters this evening. The front is being preceded by
southerly gales. Winds will ease quickly following the frontal
passage. The front has slowed its forward progress somewhat as a
wave of low pressure moves northeast along the frontal band. This
has prompted the continuation of the gale warnings for some of the
inland and southern coastal zones until midnight tonight.

Seas will slowly subside late tonight into Monday. A small craft
advisory for hazardous seas will continue in effect over the
coastal waters into Monday.

A high pressure center will pass across the waters late Monday or
Monday night. A strong warm front will push northward through the
waters on Tuesday, preceded by strong easterly flow with gales
possible near the west entrance. The warm front will be followed
by southerly flow on Wednesday. Strong low pressure over the
northeast pacific will maintain southerly flow on Thu and fri.

Albrecht haner

Hydrology Around a couple inches of rain fell along the south
slopes of the olympics the past 12 hours. Additional rain tonight
will probably not be significant. The skokomish river has started
rising sharply but it is questionable if the amount of rain will be
enough to cause minor flood stage. The flood watch remains in effect
and with so much uncertainty, will monitor trends closely the next
few hours before deciding on whether or not a warning is needed. If
it does reach flood late tonight Monday morning, it probably will
not remain above flood stage as long as previously thought.

Rainfall will be heaviest Tuesday and Wednesday with the next warm
frontal system. A lull is expected on Wednesday, and then it picks
up a bit Thursday but is not heavy. We will have to watch
the rivers with the very high snow level around mid-week, but the
skokomish river in mason county is the only one that is an obvious
threat --- if not tonight and Monday, then certainly on Tuesday.

A hydrologic outlook was issued today for all counties except
mason, island, and san juan -- highlighting the uncertainty of the
forecasts next week but the unusually high freezing level and
periods of rain in the mountains.

Sew watches warnings advisories
Wa... Winter weather advisory until 3 am pst Monday for cascades of
pierce and lewis counties-cascades of snohomish and king
counties.

Winter storm warning until 10 am pst Monday for cascades of
whatcom and skagit counties.

Flood watch through Monday morning for hood canal area-lower
chehalis valley area-olympics.

Wind advisory until 10 pm pst this evening for admiralty inlet
area-san juan county-western whatcom county.

Wind advisory until midnight pst tonight for central coast.

Pz... Small craft advisory for rough bar until 3 pm pst Monday for
grays harbor bar.

Gale warning until midnight pst tonight for admiralty inlet-
coastal waters from point grenville to CAPE shoalwater 10
to 60 nm-coastal waters from point grenville to cape
shoalwater out 10 nm-east entrance u.S. Waters strait of
juan de fuca-northern inland waters including the san juan
islands.

Small craft advisory for hazardous seas from midnight tonight to
3 pm pst Monday for 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.

Small craft advisory for hazardous seas until 3 pm pst Monday
for coastal waters from james island to point grenville 10
to 60 nm.

Small craft advisory for hazardous seas until 3 pm pst Monday for
coastal waters from CAPE flattery to james island 10 to 60 nm-
coastal waters from CAPE flattery to james island out 10 nm.

Small craft advisory for hazardous seas until 9 am pst Monday
for west entrance u.S. Waters strait of juan de fuca.

Small craft advisory until 9 am pst Monday 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
TCNW1 - 9446484 - Tacoma, WA 22 mi51 min 44°F 50°F1002.9 hPa
TCMW1 - 9446482 - Tacoma Met, WA 22 mi45 min N 1 G 1.9
EBSW1 - 9447130 - Seattle, WA 28 mi45 min SE 2.9 G 4.1 45°F 51°F1002.9 hPa
WPOW1 - West Point, WA 34 mi33 min SE 11 G 13 46°F 1002.4 hPa (-0.7)44°F
46120 38 mi37 min SW 16 48°F 1001.8 hPa46°F
46121 39 mi40 min 12 47°F 1002.2 hPa44°F

Wind History for Tacoma MET, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Renton Municipal Airport, WA18 mi40 minSE 310.00 miOvercast46°F46°F100%1002.9 hPa
Seattle, Seattle-Tacoma International Airport, WA19 mi40 minSE 65.00 miFog/Mist45°F43°F93%1002.9 hPa
Pierce County-Thun Field, WA20 mi38 minSSW 7 G 1210.00 miOvercast50°F44°F82%1002.4 hPa
Boeing Field - King County International Airport, WA22 mi40 minSSE 38.00 miOvercast45°F45°F100%1002.6 hPa

Wind History from RNT (wind in knots)
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Last 24hrSE3SE4S6SE5SE4SE5SE5SE4S5SE3S5S9S83CalmCalm3E63CalmCalmCalm3SE3
1 day agoE3CalmCalmCalmCalmE4CalmCalmS3S4SE3SE3SW4SW3CalmCalmCalmSE3SE3E4CalmSE3SE4SE4
2 days agoS6SE4CalmS6SE5S5SE7SE9SE6S6S8S9
G18
S10S7S8SE9S7SE5SE4S3CalmS3E3E3

Tide / Current Tables for Des Moines, Washington
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Des Moines
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Mon -- 06:49 AM PST     12.06 feet High Tide
Mon -- 07:21 AM PST     Sunrise
Mon -- 09:09 AM PST     Moonrise
Mon -- 12:13 PM PST     6.48 feet Low Tide
Mon -- 04:27 PM PST     Sunset
Mon -- 05:02 PM PST     10.39 feet High Tide
Mon -- 06:26 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.60.62.85.68.310.511.71211.510.28.67.26.56.77.78.99.910.4108.76.84.52.10.2

Tide / Current Tables for Tacoma, Commencement Bay, Sitcum Waterway, Puget Sound, Washington (sub)
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Tacoma
Click for Map
Mon -- 06:42 AM PST     12.07 feet High Tide
Mon -- 07:21 AM PST     Sunrise
Mon -- 09:09 AM PST     Moonrise
Mon -- 12:16 PM PST     6.79 feet Low Tide
Mon -- 04:28 PM PST     Sunset
Mon -- 05:05 PM PST     10.47 feet High Tide
Mon -- 06:27 PM PST     Moonset
Mon -- 11:58 PM PST     -0.98 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.80.73.268.710.811.91211.410.28.77.46.877.88.91010.510.18.86.74.21.7-0.3

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 (4,6,7,8)
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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.