Monday, May29, 2017 L-36.com


Marine Weather and Tides
Herron Island, WA

Version 3.4
What's New / NOTES
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 5:19AMSunset 8:59PM Monday May 29, 2017 2:02 PM PDT (21:02 UTC) Moonrise 8:41AMMoonset 11:45PM Illumination 19% Phase: Waxing Crescent; Moon at 4 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- 900 Am Pdt Mon May 29 2017
Today..S wind to 10 kt becoming variable 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Tonight..NW wind 5 to 15 kt becoming S after midnight. Wind waves 2 ft or less. A slight chance of showers after midnight.
Tue..S wind to 10 kt rising to 5 to 15 kt in the afternoon. Wind waves 2 ft or less. A slight chance of showers in the morning then a chance of tstms in the afternoon.
Tue night..SW wind 5 to 15 kt becoming se after midnight. Wind waves 2 ft or less.
Wed..S wind to 10 kt becoming nw in the afternoon. Wind waves 1 ft or less.
Wed night..NW wind 5 to 15 kt becoming S after midnight. Wind waves 2 ft or less.
Thu..S wind 5 to 15 kt becoming sw. Wind waves 2 ft or less.
Fri..SW wind 5 to 15 kt becoming n. Wind waves 2 ft or less.
PZZ100 900 Am Pdt Mon May 29 2017
Synopsis for the northern and central washington coastal and inland waters..A surface ridge over the offshore waters today combined with a surface trough over eastern wa will maintain moderate to strong onshore flow through Tuesday night. The ridge will shift over the wa coast Tuesday evening as a weakening cold front approaches the region. The weak surface ridge will shift over the western wa interior Wednesday while the approaching front eventually dissipates over the coastal waters Wednesday night and Thursday.

7 Day Forecast for Marine Location Near Herron Island, WA
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location: 47.2, -122.94     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 291111
afdsew
area forecast discussion
national weather service seattle wa
411 am pdt Mon may 29 2017

Synopsis Onshore flow will increase through Tuesday as upper
ridging exits to the east. Marine moisture, in the form of low
clouds will push further inland and persist longer each day. An
upper trough and southerly flow aloft will bring an increasing
chance of showers and a few thunderstorms, mainly Tuesday and
Tuesday night. Weak weather disturbances will keep clouds and a
chance of showers in the forecast through the end of the week
ahead.

Short term This weekend's warm and dry upper ridge will exit
east today toward the northern rockies, with increasing southwest
flow aloft. This has already opened the door to cooler marine air
spreading inland overnight, along with low marine clouds. ASOS obs
and derived fog imagery show low clouds have already pushed inland
through the strait to near pae, and up from the southwest to pwt
and sea. By sunrise, marine clouds should fill in further over the
lowlands. As a result of the well-defined albeit shallow marine
air, today's afternoon temperatures will be down 10 or more
degrees over the puget sound lowlands from Sunday. Otherwise, a
few showers may pop up this afternoon over the cascade crest and
the interior of the olympic mtns, but weak wind profiles and
plenty of convective inhibition suggests that any showers will be
short-lived, just a quick pulse.

On Tuesday, we will be eyeing a disturbance that will swing up
from the southwest. Mid-level lapse rates will steepen with the
approach of this feature, with large-scale lift helping showers to
blossom over western washington on Tuesday. The marine layer will
deepen, and marine clouds are likely to be stubborn, leading to a
cool day with below normal temperatures. Owing to a cool and
stable boundary layer but unstable mid-levels, convection on
Tuesday will be elevated, instead of surface-based. The mid-level
wind profile will have quite a bit of directional and speed shear,
so some organization into a few clusters of thunderstorms seems
plausible. The focus of any thunderstorms will shift from the
olympic peninsula late in the morning to the cascades by early tue
evening, passing across the seattle metro area during the
afternoon. With low-hanging marine clouds, sky watchers will not
be able to see the convective clouds above.

An upper low off the b.C. Coast and w-sw flow aloft will continue
to deepen the marine air on Wednesday. Precip chances go down on
wed due to less large-scale lift, but orographic lift with the
onshore flow pattern and moist boundary layer could lead to a few
light showers. Haner

Long term Thursday and Friday will feature onshore flow and
broad upper troughing over the pac nw. This will favor near or
slightly below normal temperatures along with a few light showers,
mainly on windward mountain slopes and in a puget sound
convergence zone. The ECMWF basically maintains this pattern
Saturday and possibly into next Sunday, while the GFS becomes a
bit more zonal with 500 mb heights rising above 570 decameters.

This will mainly affect the inland extent of marine clouds and
would make a few degrees difference in high temperatures, but
nothing more impactful than that. Haner

Aviation Wrn wa will remain btwn an upper level trof offshore and
a ridge of high pres over the interior w. SW flow aloft will become
more sly with time.

Meanwhile, expect wdsprd ifr CIGS over the coast, puget sound region
swd, and areas adjacent to the strait of juan de fuca this morning,
with areas of ifr CIGS from whidbey island nwd. There will be areas
of lifr CIGS vsbys over the interior lowlands. CIGS will lift into
the MVFR category range and the fog will dissipate by 1900 utc.

Expect the clouds to scatter out over the interior btwn 1800 and
2000 utc; however, stratus will linger over the coast all day.

Ksea... The stratus was moving in from the south at this time. Expect
ifr CIGS to lift into the MVFR category range (1-2k ft) by late this
morning. There will likely be fog reducing the surface visibility to
5 sm, possibly as low as 2sm, this morning. Expect the clouds to
scatter out between 11 am and noon. Winds will be southerly 5-10
knots, becoming westerly this afternoon.

Marine
High pressure offshore coupled with lowering pressure east of the
cascades will result in strengthening onshore flow through tonight.

The flow will weaken Tuesday as the offshore high shifts east,
eventually reaching the wa coast Tue evening. A 1014 mb high on the
wa coast with lower pressure east of the cascades will result in
light onshore flow on Wednesday.

Sew watches warnings advisories
Wa... None.

Pz... Gale warning until 5 am pdt Tuesday for central u.S. Waters
strait of juan de fuca-east entrance u.S. Waters strait of
juan de fuca.

Small craft advisory until 5 am pdt Tuesday for northern inland
waters including the san juan islands-west entrance u.S.

Waters strait of juan de fuca.

Small craft advisory until 3 am pdt Tuesday for admiralty inlet.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46121 13 mi1421 min 7.8 57°F 1015.7 hPa52°F
TCNW1 - 9446484 - Tacoma, WA 28 mi62 min 60°F 53°F1016.5 hPa (-1.6)
TCMW1 - 9446482 - Tacoma Met, WA 28 mi62 min NNW 6 G 7
WPOW1 - West Point, WA 42 mi62 min S 6 G 6 56°F 1016.3 hPa (-1.7)53°F
EBSW1 - 9447130 - Seattle, WA 42 mi62 min Calm G 4.1 58°F 51°F1016.3 hPa (-1.8)
46120 48 mi42 min NW 1.9 56°F 1015.7 hPa52°F

Wind History for Tacoma MET, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Shelton, Shelton Sanderson Field, WA11 mi69 minVar 410.00 miFair67°F54°F63%1015.5 hPa
Olympia, Olympia Airport, WA15 mi68 minN 010.00 miFair62°F54°F75%1016.5 hPa
Tacoma, Tacoma Narrows Airport, WA20 mi69 minN 010.00 miPartly Cloudy59°F53°F81%1016.9 hPa
Bremerton, Bremerton National Airport, WA21 mi66 minVar 410.00 miFair68°F55°F63%1017.7 hPa

Wind History from SHN (wind in knots)
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Last 24hrCalmSE3CalmSW11SW16SW15SW14SW14
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SW14SW10SW13SW14SW7SW6SW6S3S6CalmSW74
1 day agoE6NE4CalmSE55N7E5CalmW3CalmCalmW8W6W10SW8W9W7W8W8W8W3CalmCalmCalm
2 days agoCalmE5E6CalmS5W10SW6SW4NW3W3W3W3W3CalmCalmCalmCalmSW3CalmSE3E5Calm34

Tide / Current Tables for Arcadia, Washington
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Arcadia
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Mon -- 03:29 AM PDT     6.55 feet Low Tide
Mon -- 05:21 AM PDT     Sunrise
Mon -- 08:07 AM PDT     13.21 feet High Tide
Mon -- 09:41 AM PDT     Moonrise
Mon -- 03:27 PM PDT     -2.37 feet Low Tide
Mon -- 08:57 PM PDT     Sunset
Mon -- 10:39 PM PDT     15.96 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1310.486.76.88.210.312.213.212.811.28.75.52.2-0.6-2.2-2.1-0.13.17.1111415.715.9

Tide / Current Tables for Hammersley Inlet, 0.8 miles E of Libby Pt, Washington Current
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Hammersley Inlet
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Mon -- 01:33 AM PDT     -2.62 knots Max Ebb
Mon -- 04:35 AM PDT     0.00 knots Slack
Mon -- 05:21 AM PDT     Sunrise
Mon -- 06:30 AM PDT     1.85 knots Max Flood
Mon -- 08:25 AM PDT     -0.00 knots Slack
Mon -- 09:41 AM PDT     Moonrise
Mon -- 01:01 PM PDT     -4.05 knots Max Ebb
Mon -- 04:29 PM PDT     0.01 knots Slack
Mon -- 07:17 PM PDT     3.79 knots Max Flood
Mon -- 08:57 PM PDT     Sunset
Mon -- 10:37 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.2-2.6-2.6-2-0.90.61.71.70.6-0.7-1.9-3-3.8-4-3.7-2.6-112.83.73.52.41-0.5

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 (17,4,5,8)
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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.