Friday, September21, 2018 L-36.com


Marine Weather and Tides
Seattle, WA

Version 3.4
What's New / NOTES
9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 6:54AMSunset 7:09PM Friday September 21, 2018 4:26 AM PDT (11:26 UTC) Moonrise 5:05PMMoonset 2:09AM Illumination 87% Phase: Waxing Gibbous; Moon at 11 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- 329 Am Pdt Fri Sep 21 2018
.small craft advisory in effect through late tonight...
Today..S wind 15 to 25 kt. Wind waves 2 to 4 ft. A slight chance of rain in the afternoon.
Tonight..S wind 15 to 25 kt. Wind waves 2 to 4 ft. Rain in the evening then rain likely after midnight.
Sat..SW wind 10 to 20 kt. Wind waves 1 to 3 ft. A slight chance of showers in the morning then a chance of showers in the afternoon.
Sat night..NW wind 5 to 15 kt becoming S after midnight. Wind waves 2 ft or less.
Sun..SW wind to 10 kt in the morning becoming light. Wind waves 1 ft or less in the morning becoming less than 1 ft.
Sun night..Light wind. Wind waves less than 1 ft.
Mon..Light wind becoming N to 10 kt. Wind waves 1 ft or less.
Tue..Light wind. Wind waves 1 ft or less.
PZZ100 329 Am Pdt Fri Sep 21 2018
Synopsis for the northern and central washington coastal and inland waters..Southerly small craft advisory winds will affect most of the waters today ahead of the next front. Onshore flow will develop tonight and Saturday as this system moves inland with more widespread small craft advisory winds possible. The flow will turn offshore early next week as a thermal trough forms along the coast.


7 Day Forecast for Marine Location Near Seattle, WA
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location: 47.68, -122.41     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 211053
afdsew
area forecast discussion
national weather service seattle wa
353 am pdt Fri sep 21 2018

Synopsis Warm front lifting north out of the area early this
morning. A slow moving cold front will move through the area
tonight. Rain out ahead of the front reaching the coast today
spreading inland tonight. Post frontal onshore flow on Saturday
resulting in a cool and showery day. Showers will diminish on
Sunday as high pressure moves into the area. Strong upper level
ridge building over the area next week for a spell of dry weather.

Warmest days in the middle and latter part of the week with low
level offshore flow.

Short term Satellite imagery shows warm front near the canadian
border moving northeast with a cold front offshore near 132w at
3 am 10z. Rain associated with the warm front has stopped along
the coast with light rain continuing around bellingham. Cloudy
skies for the remainder of the area. Temperatures were in the mid
50s to lower 60s.

Warm front lifting northeast this morning with the rain coming to
an end over the northern sections. Cold front will slowly move
east today but still be offshore by late afternoon. This will
leave western washington in the warm sector pushing high
temperatures in the mid 60s to lower 70s even with the cloud
cover. Rain out ahead of the cold front reaching the coast this
afternoon but the rain will still be west of puget sound late in
the afternoon.

Cold front slowly moving through the area tonight with rain. Model
surface gradients have kolm-kbli peaking around plus 3 mb and
kpdx-kbli around plus 6 mb so expect some breezy conditions with
the rain tonight as well. Lows will be in the mid and upper 50s.

Cool upper level trough dropping into the area from the northwest
on Saturday keeping showers in the forecast. Breezy conditions
continuing with highs only in the lower to mid 60s.

Upper level trough moving east of western washington on Saturday
night with most of the shower activity coming to an end in the
evening. Surface gradients easing overnight into Sunday morning.

Lows will be in the mid 40s to lower 50s.

Outside of some lingering showers in the north cascades dry day in
store for Sunday with northwesterly flow aloft and an upper level
ridge building offshore. Surface gradients remaining onshore which
will keep some clouds around in the morning hours and keep high
temperatures in the 60s.

Long term Extended models in good agreement with the upper
level ridge offshore building Monday and Tuesday then slowly
weakening through the end of the week. Surface gradients
northwesterly on Monday and Tuesday turn offshore Wednesday and
Thursday. Will not be surprised if the warmest high temperatures
in the middle of the week are along the coast. Before the offshore
flow develops will have to keep an eye out for the possibility of
some morning fog with light gradients especially Monday morning
( yes, it's that time of year again ). Highs on Monday and
Tuesday in the mid 60s to lower to mid 70s warming to the upper
60s and 70s for Wednesday and Thursday. Lows will be on the cool
side with the colder locations getting down into the upper 30s
with most places in the 40s and the urban locations remaining in
the lower 50s. Felton

Aviation Moist westerly flow aloft today will become wetter
and more southwesterly tonight as a front approaches and moves
through the area. At the surface, moderate southeast flow today will
become southwest tonight. The air mass is stable, with light rain at
times over far northern areas. Light rain will become widespread
after 00z. GenerallyVFR ceilings early this morning will become
MVFR as the front arrives this evening.

Ksea...VFR ceilings around 4k ft today will lower to 2-3k ft in
light rain tonight. Southerly winds 8-12 kt rising to 10-15 kt this
afternoon ahead of the front. Chb

Marine Southerly winds have risen behind a warm front early this
morning with small craft advisory strength winds affecting most of
the waters. There will be a lull at times over the interior waters
later this morning and early afternoon before picking up again
through tonight ahead of the next front. For puget sound, southerly
winds will be strongest from seattle northward (up to 25 kt), and
generally lighter further south through tonight. The small craft
runs through tonight for all waters except the central strait.

A 995 to 1000 mb low will track into south vancouver island later
tonight and Saturday. This will cause southerly gradient to increase
and small craft winds will likely develop again across most all
waters. Winds could approach gale force over the coastal waters
and east entrance to the strait and adjacent waters on Saturday.

Winds will gradually ease through Sunday. Lighter north flow develops
on Monday with stronger offshore flow Tuesday through the end of
the week. Offshore winds may reach small craft in a few spots near
the coastal gaps and east entrance. Dtm

Climate The record for the most consecutive months with less
than 1 inch of rain in seattle, including the federal building
records that go back to the 1890's, is 5 ( june through october
1987 ). The current streak is at 4 months ( may 0.12", june 0.63",
july 0.05" and august 0.20" ). Currently the rain total for
september in seattle is 0.91". It looks like the incoming front
will produce enough rain to push seattle over the 1 inch mark for
the month keeping the record intact. The last time seattle had 4
months in a row with less than 1 inch of rain every month before
this year was 15 years ago, june through september 2003.

This will end up being the driest may through september on record
at seattle-tacoma airport ( records started in 1945 ). The current
record is 2.94" in 2003. The total this year so far is 1.91".

Including the federal building records it will be close with the
driest may through september at the federal building 2.09" in
1928. Felton

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory until 5 am pdt Saturday 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-east entrance u.S. Waters strait of
juan de fuca-west entrance 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 2 mi87 min S 16 G 18 59°F 1016.4 hPa (-1.3)52°F
EBSW1 - 9447130 - Seattle, WA 7 mi39 min S 5.1 G 6 62°F 56°F1016.4 hPa
TCMW1 - 9446482 - Tacoma Met, WA 28 mi39 min SSE 1.9 G 4.1
TCNW1 - 9446484 - Tacoma, WA 29 mi39 min 1017.1 hPa
PTWW1 - 9444900 - Port Townsend, WA 35 mi39 min ESE 7 G 9.9 1015.4 hPa

Wind History for Seattle, Puget Sound, WA, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boeing Field - King County International Airport, WA12 mi94 minSSE 610.00 miMostly Cloudy59°F51°F75%1016.7 hPa
Renton Municipal Airport, WA16 mi94 minSSE 510.00 miFair60°F51°F72%1017.2 hPa
Everett Snohomish County, WA17 mi94 minESE 11 G 1610.00 miPartly Cloudy59°F48°F69%1016.2 hPa
Seattle, Seattle-Tacoma International Airport, WA17 mi94 minS 710.00 miOvercast60°F48°F67%1017.6 hPa
Bremerton, Bremerton National Airport, WA24 mi91 minS 710.00 miOvercast57°F50°F78%1018.5 hPa

Wind History from BFI (wind in knots)
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Last 24hrSE8E4SE6SE6SE7SE7S4S4S5SW9SW4443S3SW5S4S7S5S5SE7SE6SE6S7
1 day agoSE6SE5SE3SE4SE5SE3E33CalmW66W54SW5SW6SW44S6S4CalmE3CalmSE5SE7
2 days agoCalmCalmCalmCalmNE44NE4E4NW6NW7
G17
NW8W6W8NW6NW5CalmCalmCalmCalmCalmCalmCalmCalmSE3

Tide / Current Tables for Meadow Point, Shilshole Bay, Washington
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Alki Point, 0.3 miles W of, Washington Current
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Tide / Current data from XTide NOT FOR NAVIGATION
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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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Other links: Northern Pacific     Contential US     Full GOES-East
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.