Tuesday, January23, 2018 L-36.com


Marine Weather and Tides
Issaquah, 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 7:42AMSunset 4:57PM Monday January 22, 2018 11:44 PM PST (07:44 UTC) Moonrise 10:36AMMoonset 10:56PM Illumination 40% Phase: Waxing Crescent; Moon at 6 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- 857 Pm Pst Mon Jan 22 2018
Tonight..S wind to 10 kt becoming se 5 to 15 kt after midnight. Wind waves 2 ft or less. Isolated showers in the evening. A slight chance of rain after midnight.
Tue..SE wind 10 to 20 kt rising to 15 to 25 kt in the afternoon. Wind waves 2 to 4 ft. Rain.
Tue night..SE wind 10 to 20 kt becoming S 5 to 15 kt after midnight. Wind waves 1 to 3 ft. Rain.
Wed..S wind 5 to 15 kt. Wind waves 2 ft or less.
Wed night..S wind 15 to 25 kt. Wind waves 2 to 4 ft.
Thu..S 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 10 to 20 kt becoming se 5 to 15 kt. Wind waves 1 to 3 ft.
Sat..S wind 10 to 20 kt becoming 5 to 15 kt. Wind waves 1 to 3 ft.
PZZ100 857 Pm Pst Mon Jan 22 2018
Synopsis for the northern and central washington coastal and inland waters..A warm front will move east through the waters Tuesday...preceded by strong east to southeast pressure gradients resulting in gales over the coastal waters and the inland waters from admiralty inlet north. Gradients will relax late Tuesday following the warm front. From Tuesday night through Saturday, a low pressure trough will pass about every 12 to 18 hours. The strongest trough may come on Friday night.

7 Day Forecast for Marine Location Near Issaquah, WA
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location: 47.54, -122.02     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 230553
afdsew
area forecast discussion
national weather service seattle wa
953 pm pst Mon jan 22 2018

Synopsis A weak upper level ridge of high pressure will move
through the area tonight. The next front to reach the area will
spread precipitation into western washington beginning Tuesday
morning with the precipitation continuing until the front moves
through the area Wednesday morning. Heavy snow is possible in the
mountains. A cool upper level trough will set up offshore later
Wednesday and remain through Thursday.

Short term Satellite imagery shows flat upper level ridge over
western washington this evening. Next front well offshore with the
parent 993 mb low near 47n 136w and the associated front
trailing back to the southwest. Temperatures at 9 pm 05z were in
the mid 30s to mid 40s.

Weak upper level ridge exiting quickly tonight with precipitation
out ahead of the incoming front spreading over the area Tuesday
morning. Parent low associated with the front moving north on
Tuesday. This will slow down the eastward movement of the front to
a crawl with the front still offshore at 00z Wednesday. Snow
levels will be around 2500 to 3000 feet. Will upgrade the watch
for the cascades to a winter storm warning and issue a winter
weather advisory for the olympics. Easterly gradients increasing
Tuesday morning especially over the northern portion of the area.

A wind advisory is in effect for the san juans and the admiralty
inlet area.

Front slowly moving to the coast Tuesday night into Wednesday
morning with the steady precipitation continuing. Snow levels
slowly rising in the cascades Tuesday evening into Wednesday
morning but easterly gradients will keep the cool air in place in
the passes. Easterly gradients will relax enough for the wind
advisory to come to an end early Tuesday evening.

What is left of the front moving through the area on Wednesday
keeping rain at times in the forecast. Precipitation rates will
ease on Wednesday so will only have the winter storm warning for
the cascades up through the early morning hours.

A couple of upper level troughs moving through western washington
Wednesday night into Thursday keeping precipitation in the
forecast for the remainder of the short term. Felton

Long term Previous discussion follows. The medium range
solutions were not in very good agreement regarding the location
and timing of a potential atmospheric river event during this
period. The ECMWF was faster and showed heavy rain impacting the
cwa as early as Saturday. It also showed the brunt of the heaviest
rain impacting the olympics and north cascades (snohomish county
northward). The GFS didn't set up the atmospheric river event
until early next week, and indicated that the heaviest rainfall
will occur across the southern part of the CWA (king county
southward).

The screaming message is that, at some point, we can expect
expect the possibility of excessive rainfall sometime this weekend
or early next week. However, the location of the heaviest rain
was still uncertain.

The medium range solutions were in more or less agreement that a
cold upper level trough will move over the area during the end of
the period. Felton

Aviation A flat upper ridge axis currently over western
washington will exit the area late tonight with nothing in the way
of showers expected in the very near term andVFR conditions area-
wide. A warm front will arrive on Tuesday morning... Returning the
prospect of rain to the area and as such pulling CIGS down into low-
endVFR to MVFR conditions. Moderate westerly flow aloft will become
strong southwesterly Tuesday morning.

Ksea...VFR CIGS expected tonight. Warm frontal rain will arrive
around 14z tue. CIGS will start to lower thereafter, eventually
falling into the 020-030 range late Tue morning. Reduced vsbys
possible at times from 18z-24z Tue during periods of moderate rain.

Otherwise, low-level wind shear will reach criteria for inclusion in
the TAF on Tue owing to e-se surface wind of 8-13 kt and 2000-foot
winds that will be southerly around 35-40 kt for much of the day.

Haner smr

Marine A warm front will move east through the waters
Tuesday... Preceded by strong east to southeast pressure gradients.

This will allow southeast gales over the coastal waters, and over
the inland waters from admiralty inlet north. Strongest winds over
the inland waters will be focused from admiralty inlet up to haro
strait. Southeast gradients will relax Tuesday evening following the
warm front. All that being said... Inherited headlines look good and
will remain in place.

From Tuesday night through Saturday, a low pressure trough will
pass about every 12 to 18 hours. Forecast winds could be
conservative during any single forecast period due to the effect
of averaging out so many small, compact, fast-moving features.

The strongest trough may come around Friday night. Haner smr

Hydrology The skokomish river fell below flood stage this
morning but is receding slowly tonight. Another round of rain
Tuesday into Wednesday will push the river back up to near flood
stage on Wednesday and a flood watch has been issued.

There is a potential for an atmospheric river setting up over the
area this weekend or early next week for a period of significant
rainfall. At this time, the location of where the heaviest rain
will occur was still uncertain due to disagreement in the medium
range models. The main message is that the combination of rising
snow levels and heavy rainfall could lead to flooding on some
rivers (besides the skokomish river) late this weekend or early
next week.

The USGS landslide threshold indices were near or at the
thresholds where landslides become probable. The additional
rainfall this week will only increase the risk of shallow
landslides. Felton

Sew watches warnings advisories
Wa... Winter storm warning from 6 am Tuesday to 6 am pst Wednesday for
cascades of pierce and lewis counties-cascades of snohomish
and king counties.

Flood watch from Wednesday morning through Thursday morning for
hood canal area-lower chehalis valley area-olympics.

Wind advisory from 9 am to 6 pm pst Tuesday for admiralty inlet
area-san juan county.

Pz... Small craft advisory for rough bar until 10 am pst Wednesday for
grays harbor bar.

Gale warning until 3 pm pst Tuesday 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 for hazardous seas until midnight pst
tonight 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 1 am to 6 am pst Tuesday for east
entrance u.S. Waters strait of juan de fuca-northern inland
waters including the san juan islands.

Gale warning from 6 am to 6 pm pst Tuesday 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.

Gale warning from 10 am to 6 pm pst Tuesday for admiralty inlet.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EBSW1 - 9447130 - Seattle, WA 17 mi45 min ESE 5.1 G 8 44°F 48°F1025 hPa (-0.7)
WPOW1 - West Point, WA 24 mi45 min SSE 8.9 G 8.9 44°F 1024.9 hPa (-0.4)38°F
46120 25 mi40 min SSW 7.8 45°F 1024.1 hPa38°F
TCMW1 - 9446482 - Tacoma Met, WA 28 mi45 min SSE 2.9 G 4.1
TCNW1 - 9446484 - Tacoma, WA 28 mi45 min 39°F 49°F1025.3 hPa (-0.8)

Wind History for Seattle, Puget Sound, WA, WA
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Last
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Renton Municipal Airport, WA11 mi52 minSSE 310.00 miOvercast40°F36°F86%1025.4 hPa
Boeing Field - King County International Airport, WA15 mi52 minSSE 310.00 miMostly Cloudy40°F37°F89%1024.8 hPa
Seattle, Seattle-Tacoma International Airport, WA17 mi52 minESE 810.00 miMostly Cloudy41°F35°F79%1025.3 hPa

Wind History from RNT (wind in knots)
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Last 24hr3S8E3SE5SE6S8SE9SE6SE8
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S10S10SE10SE9S6E3CalmSE33S3
1 day agoSE16
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S9S5E3SE7E3E6SE6SE4
2 days agoS11
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Tide / Current Tables for Duwamish Waterway, Washington
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Duwamish Waterway
Click for Map
Tue -- 02:34 AM PST     2.43 feet Low Tide
Tue -- 07:45 AM PST     Sunrise
Tue -- 09:10 AM PST     11.72 feet High Tide
Tue -- 11:03 AM PST     Moonrise
Tue -- 04:00 PM PST     3.45 feet Low Tide
Tue -- 04:57 PM PST     Sunset
Tue -- 09:30 PM PST     8.14 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.83.42.62.53.55.37.49.51111.711.410.38.76.95.13.93.53.94.96.27.388.17.5

Tide / Current Tables for Restoration Point, 0.6 miles ESE of, Washington Current
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Restoration Point
Click for Map
Tue -- 03:18 AM PST     0.00 knots Slack
Tue -- 05:41 AM PST     0.53 knots Max Flood
Tue -- 07:46 AM PST     Sunrise
Tue -- 09:14 AM PST     -0.00 knots Slack
Tue -- 11:03 AM PST     Moonrise
Tue -- 12:52 PM PST     -0.78 knots Max Ebb
Tue -- 04:57 PM PST     Sunset
Tue -- 05:08 PM PST     0.00 knots Slack
Tue -- 06:34 PM PST     0.24 knots Max Flood
Tue -- 09:22 PM PST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.6-0.5-0.3-0.10.20.50.50.40.30.1-0.2-0.5-0.7-0.8-0.7-0.5-0.3-00.20.20.20.1-0.1-0.3

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 (2,6,7,8)
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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.