Friday, August23, 2019 L-36.com


Marine Weather and Tides
Des Moines, WA

Version 3.4
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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:14AMSunset 8:09PM Friday August 23, 2019 5:52 PM PDT (00:52 UTC) Moonrise 11:06PMMoonset 1:31PM Illumination 40% Phase: Third Quarter Moon; Moon at 23 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- 254 Pm Pdt Fri Aug 23 2019
Tonight..N wind 5 to 15 kt becoming S after midnight. Wind waves 2 ft or less.
Sat..S wind to 10 kt becoming nw in the afternoon. Wind waves 1 ft or less. A slight chance of showers.
Sat night..NE wind 10 to 20 kt. Wind waves 1 to 3 ft.
Sun..SE wind to 10 kt in the morning becoming light. Wind waves 1 ft or less.
Sun night..NE wind 5 to 15 kt becoming N to 10 kt after midnight. Wind waves 2 ft or less.
Mon..N wind to 10 kt becoming 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Mon night..NE wind to 10 kt. Wind waves 1 ft or less.
Tue..N wind to 10 kt. Wind waves 1 ft or less.
Wed..N wind to 10 kt. Wind waves 1 ft or less.
PZZ100 254 Pm Pdt Fri Aug 23 2019
Synopsis for the northern and central washington coastal and inland waters..A weak cold front will dissipate over the coastal waters tonight and Saturday. Otherwise, onshore flow will continue through early next week with high pressure offshore and lower pressure inland. Low level flow will turn offshore on Tuesday as a thermal trough builds north along the west coast.


7 Day Forecast for Marine Location Near Des Moines, WA
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location: 47.39, -122.35     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 232113
afdsew
area forecast discussion
national weather service seattle wa
213 pm pdt Fri aug 23 2019

Synopsis
A trough of low pressure will slowly move across central bc
through the weekend. This will bring a few showers and near to
below normal temperatures for western washington. The trough will
slide east and high pressure will build in behind it by Sunday and
into early next week. Low level offshore flow will develop by mid
week and produce well above normal temperatures and dry
conditions.

Short term tonight through Monday
Satellite and radar depict the steady eastward progress of the
showers across the northern tier of the forecast area this
afternoon. Rainfall totals were highest across the san juans and
whatcom county. Peak totals of about .10 to .20 inches were
observed in those areas. Measurable rain appears to have been
recorded as far south as line from port angeles to marysville,
with dry and partly cloudy conditions south of there. A decrease
in shower activity is expected this afternoon with most areas dry
by sunset. Precipitable water values drop off as the atmosphere
briefly dries out this evening. However it is short lived as rain
showers should develop again off the coast late tonight and likely
reach the coast by sunrise on Saturday. There will be a low chance
for showers across the area on Saturday with the greatest chance
being over the olympic peninsula and coast earlier in the day.

This activity will not be significant but the showers and clouds
will help to keep temperatures below normal for many areas on
Saturday. The troughing will be slow to move east and leave the
area open for a few more showers Sunday across the far northern
areas closest to canada. But otherwise it will remain cloudy with
highs lingering near normal.

A change in the pattern will take place overnight Sunday and into
Monday. The trough of low pressure will finally exit well east of
the area. This will permit a ridge of mid level high pressure
which has been lingering well south of the area to begin building
north. Heights will rise quite a bit overnight Sunday and into
Monday and so Monday will be a much drier day with temperatures
bumping up about 5 degrees from Sunday to reach near or slightly
above normal.

Long term Tuesday through Friday
This warming trend will continue through midweek. Heights will
continue to climb and crest in the 585-588dm range. 850mb temps
will climb as well to around 18-20c by Tuesday evening with winds
becoming more favorable for supporting low level warmth. Highs on
Tuesday are expected about 10 degrees warmer than Monday, so
should be well above normal with lots of Sun and lower to mid 80s.

Wednesday looks to be the hottest day at present as 850mb temps
crest in the +20 to +23c range with low level offshore flow. This
suggests highs in the mid to upper 80s with readings near 90
possible from seattle to the south for some late summer heat.

Current heat impact levels indicate some impacts for vulnerable
populations but not hot enough for more widespread concerns at
this time. Record highs for seattle on t-w-th are 88,95,91 and so
those appear to be safe.

Thursday looks set to be a cooler day, by at least a few degrees
if not more. Heights fall and 850mb temps do as well. There is
some suggestion of some precip even in the area so the temperature
drop may be even more than current forecasts indicate. At present
have shows the greatest cooling on the coast and a few degrees of
cooling inland but will have to monitor trends in the extended.

Friday at this point looks like it may remain above normal across
the interior so have left forecast highs in the 80s as the details
on breakdown of the warmer pattern looks to be a bit in question.

Aviation A weak system passing across the northern half of the
state today has brought widespread mid and high level cloud cover to
the terminals today, with a widespread area light to moderate
rainfall from roughly clallam co into skagit and whatcom counties.

Most of the activity was confined to kclm and kbli, with some brief
reductions in CIGS and vsbys. The majority of the rain has moved
east and dry conditions are expected for the remainder of today,
with any cig and or vsby reductions rapidly improving.

All other TAF sites have beenVFR with ceilings generally above 10k
ft under no vsby restrictions. This will continue to be the case
thru the evening and part of the overnight. Low level marine stratus
will develop along the coast and push inland some, likely reaching
khqm and kolm but may spare the sound terminals with perhaps
coverage capping at few by daybreak. Clouds should then lift and
scatter some into the afternoon. N NE winds 10kts or less this
afternoon will become light overnight and gradually veer to the S sw
through the day Saturday at again 10kts or less.

Ksea...VFR ceilings through the evening and much of the overnight. A
few MVFR stratus may move into the vicinity of the airfield by
daybreak Saturday. Winds N NE 10kts or less into the overnight
hours, veering S SW by Saturday afternoon under 10kts.

Kovacik

Marine Quasi-zonal to weak troughing pattern will hang in place
in the mid and upper levels tonight and Saturday, while at the
surface, onshore flow will continue as higher pressure remains
located offshore and lower pressure remains inland. A weak shortwave
trough embedded in the mid level flow is skirting this region today.

With it has been a rather widespread area of light to moderate
rainfall across mainly the strait of juan de fuca and the northern
inland waters. Most of this activity is currently pushing east as of
21z and will continue to clear the waters thru the remaining hours
of the afternoon. Wind and waves have remained rather tranquil so
far today. By late afternoon early evening, gradients will
strengthen enough to produce small craft advisory level winds down
the central and eastern strait. These winds will last thru much of
the night and may bleed into the adjacent northern inland waters
where a small craft advisory has been issued with this forecast
update to account for this.

Winds will ease across these waters Saturday morning tho there
could be an observation or two of small craft winds in the strait
between 12-18z . Onshore flow will continue with little change in
the synoptic pattern, although a weak front will cross the local
area. In its wake, a stronger westerly push down the strait is
possible. Winds in latest guidance are capped at 30kts or below so
will hold off on a gale watch but the evening and midnight shifts
may need to issue if gradients continue to look strong.

Onshore flow looks to continue through Monday before shifting to
offshore as a thermal trough builds north from california. The
offshore flow pattern may then last thru much of the week.

Kovacik

Hydrology The daily hydrology discussion has ended until the
start of the next rainy season; it will only be updated as needed
until then.

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory from 4 pm this afternoon to 3 am pdt
Saturday for central u.S. Waters strait of juan de fuca-
east entrance u.S. Waters strait of juan de fuca.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 9 mi59 min W 5.1 G 5.1
TCNW1 - 9446484 - Tacoma, WA 9 mi59 min 70°F 56°F1013.3 hPa
WPOW1 - West Point, WA 19 mi53 min ENE 6 G 6 62°F 1013.5 hPa (-1.1)55°F
46121 22 mi35 min 67°F 1012.9 hPa59°F
46120 26 mi36 min N 5.8 60°F 1012.4 hPa56°F

Wind History for Tacoma MET, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Seattle, Seattle-Tacoma International Airport, WA4 mi60 minW 510.00 miOvercast70°F53°F55%1013.7 hPa
Boeing Field - King County International Airport, WA10 mi60 minNW 410.00 miFair71°F52°F51%1012.9 hPa
Renton Municipal Airport, WA10 mi60 minNNW 59.00 miFair71°F55°F57%1013.1 hPa
Tacoma, Tacoma Narrows Airport, WA15 mi60 minVar 310.00 miFair68°F52°F57%1012.9 hPa
Tacoma / McChord Air Force Base, WA17 mi1.9 hrsN 510.00 miA Few Clouds74°F58°F59%1013.5 hPa
Pierce County-Thun Field, WA20 mi58 minN 010.00 miFair73°F53°F50%1013.2 hPa
Bremerton, Bremerton National Airport, WA23 mi57 minNE 710.00 miA Few Clouds70°F54°F57%1014.9 hPa
Fort Lewis / Gray U. S. Army Airfield, WA24 mi1.9 hrsN 410.00 miA Few Clouds74°F59°F60%1013.5 hPa

Link to 5 minute data for KSEA

Wind History from SEA (wind in knots)
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Last 24hrW6W4W3CalmCalmCalm4S4SE4SE4SE3CalmS3CalmS3E4W43N12N11N8N6NW6W5
1 day agoW5NW4NW4N8N8NE12NE6N6N4CalmS7SW7S6S5SW4S5SW4S4W4W5CalmSW5SW7SW6
2 days agoSW5SW6SW11SW106S7SE7CalmS4SE6S3S3SW5SW4S4S3S3SW3SW6S6S6S7S7W4

Tide / Current Tables for Des Moines, Washington
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Des Moines
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Fri -- 05:21 AM PDT     1.81 feet Low Tide
Fri -- 06:16 AM PDT     Sunrise
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 12:06 PM PDT     8.73 feet High Tide
Fri -- 02:30 PM PDT     Moonset
Fri -- 05:12 PM PDT     6.04 feet Low Tide
Fri -- 08:07 PM PDT     Sunset
Fri -- 10:53 PM PDT     10.32 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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9.37.864.12.61.922.94.35.97.48.48.78.587.26.56.16.278.19.21010.3

Tide / Current Tables for Skagit Bay, 1 mile S of Goat Island, Washington Current
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Skagit Bay
Click for Map
Fri -- 02:05 AM PDT     0.04 knots Slack
Fri -- 05:15 AM PDT     1.46 knots Max Flood
Fri -- 06:16 AM PDT     Sunrise
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 08:56 AM PDT     -0.03 knots Slack
Fri -- 11:53 AM PDT     -1.09 knots Max Ebb
Fri -- 02:21 PM PDT     0.03 knots Slack
Fri -- 02:31 PM PDT     Moonset
Fri -- 05:28 PM PDT     1.18 knots Max Flood
Fri -- 08:07 PM PDT     Sunset
Fri -- 08:24 PM PDT     -0.04 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.2-0.9-0.30.81.21.41.41.10.7-0.3-0.8-1-1.1-0.9-0.50.60.91.11.20.90.4-0.7-0.9-1.1

Weather Map and Satellite Images
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wmap_P
GOES Local Image of PacificNorthwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for Seattle, WA (20,4,5,8)
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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.