Saturday, August24, 2019 L-36.com


Marine Weather and Tides
Onalaska, WA

Version 3.4
NOTICE
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 6:19AMSunset 8:08PM Saturday August 24, 2019 6:03 PM PDT (01:03 UTC) Moonrise 11:50PMMoonset 2:36PM Illumination 30% Phase: Waning Crescent; Moon at 24 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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PZZ210 Columbia River Bar- 211 Pm Pdt Sat Aug 24 2019
In the main channel.. - general seas...2 to 4 ft Saturday, building to 3 to 5 ft Sunday. - first ebb...around 1230 am Sunday morning. Seas temporarily building to 5 ft. - second ebb...around 1 pm Sunday afternoon. Seas temporarily building to 6 ft. - third ebb...around 1245 am Monday. Seas temporarily building to 7 ft.
PZZ200 211 Pm Pdt Sat Aug 24 2019
Synopsis for the southern washington and northern oregon coast.. High pressure will strengthen over the ne pacific Sunday and Monday, while thermal low pressure builds northward along the northern ca and southern or coast. Thermal low pressure is expected to continue building northward into western oregon Tuesday and Wednesday.


7 Day Forecast for Marine Location Near Onalaska, WA
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location: 46.51, -122.63     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 242208
afdsew
area forecast discussion
national weather service seattle wa
308 pm pdt Sat aug 24 2019

Synopsis Weak perturbations in the NW flow aloft will continue
to traverse the area into Sunday morning, allowing for some mid
and high cloud cover. A ridge will build north into the area late
Sunday and continue through Wednesday, with a late summer warming
trend likely with highs in the mid to upper 80s. This will
make for warm and dry conditions through much of the week before
troughing pattern returns late in the week early weekend with a
chance for showers.

Short term tonight through Tuesday The upper level pattern
this afternoon features a broad swath of NW flow aloft, extending
roughly from the gulf of alaska into the pacific northwest and
northern rockies. This flow regime then gives way to a more split
flow pattern downstream across the plains, with ridging across
the midwest & great lakes and weak troughing across the south. At
the sfc, a weak low in the haida gwaii vicinity has essentially
dampened, with trailing cold front that attempted to push inland
across washington state more of a diffuse boundary at this point.

East of the rockies, a very expansive area of high pressure
center ~1028mb encompasses much of the eastern us.

Earlier today, a fast moving shortwave trough darted across
washington and as of 21z is located in central montana. This wave
had enhanced some mid and high level moisture that has also
largely carried east. In addition, some light shower activity made
it to the coast and into the lower chehalis valley and olympic
peninsula. Appreciable lack of dynamics both at the sfc and aloft
was responsible for the demise of most this activity into the
afternoon. Some shower activity is currently noted across skagit
and whatcom counties. There is some enhanced shortwave activity
across far southern bc very near the canada us border that is
likely the source of sufficient lift for this activity.

Going forward to later this afternoon and evening, a better
onshore push of westerly low level wind is expected in the wake of
the fizzling frontal boundary. The strongest winds will slide down
the strait of juan de fuca into the northern puget sound
vicinity. These winds could potentially converge with more S SW in
the central southern sound. Although not strong, this may allow
for a convergence zone to develop with a few light showers as some
low level moisture hangs in place. Slight chance pops remain in
this general area into king and snohomish counties for a few hours
this evening.

Some cloud cover is likely Sunday morning with a reinforcing
shortwave trough glancing the northern border of the area during
the morning hours. Heights will drop briefly but best moisture
remains up in canada. Heights will then begin to rise as a ridge
across the pacific starts to build N ne. Skies are expected to
clear thru the day as this happens. Much of the same for Monday
with ridge influence a bit better than Sunday. Low level flow
will still be onshore as large area of sfc high pressure remains
offshore so could have some stratus near the coast but otherwise
sunny skies. Low level flow then turns offshore on Tuesday as a
thermal trough builds north from california. With upper level
ridge influence, this will make for noticeably warmer temps, into
the lower to mid 80s for most.

Kovacik

Long term Wednesday through Saturday Upper level ridge will
remain in place to begin the extended, as will low level offshore
flow. Wednesday will likely be the warmest day of the week with
highs at least mid to upper 80s across the interior.

By Thursday, the ridge will begin to dampen, with axis shifting
east, opening the region up to more of a SW flow aloft regime.

A few weak shortwave disturbances appear to be embedded in the
larger scale flow, which may help enhance at least some mid and
high level cloud cover, even maybe a shower or two across parts of
the pacific northwest. This may keep temps a few degrees cooler
if this were to verify, however, mid level heights still remain
fairly high, so regardless it will continue to be warm with highs
in the 80s for many.

By Friday, a system well offshore the washington coast will
amplify. This will help reestablish the ridge to some degree
across the pacific northwest, despite some weak perturbations
becoming trapped underneath. By the end of the forecast period on
Saturday, larger scale trough looks to return to the region, with
which some showers may begin to spread into the area along
a sfc cold frontal boundary.

Kovacik

Aviation Northwesterly flow aloft as an upper level trough
departs the pacific northwest. Onshore flow at the surface.VFR cigs
for most with MVFR along the northern tier of the area. ExpectVFR
through the afternoon into tonight with mid and high level clouds
around. MVFR late tonight (09z-12z) with marine stratus push. Winds
generally southerly becoming northerly for some this evening. Winds
5-10 knots.

Ksea...VFR CIGS with mid and high level clouds. MVFR CIGS with
stratus tonight into Sunday morning. Winds generally southerly
becoming more north-northeasterly tonight. Winds 5-10 knots. Jd

Marine Onshore flow continues through the weekend. A weak front
will move across the area today with another westerly push down the
strait this evening into tonight. Small craft advisory winds for the
central and eastern portions of the strait of juan de fuca later
this afternoon through tonight. Onshore flow into Monday with
offshore flow Tuesday and through much of next week. Jd

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 until 5 am pdt Sunday 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
LOPW1 - 9440422 - Longview, WA 33 mi70 min 71°F1016.6 hPa
TCMW1 - 9446482 - Tacoma Met, WA 54 mi70 min WSW 8.9 G 14
TCNW1 - 9446484 - Tacoma, WA 54 mi70 min 74°F 56°F1015.7 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chehalis-Centralia Airport, WA22 mi89 minWNW 710.00 miMostly Cloudy73°F60°F65%1016.6 hPa

Link to 5 minute data for KCLS

Wind History from CLS (wind in knots)
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Last 24hrNE4NW5CalmCalmCalmCalmSW4CalmSW3SW4Calm--CalmCalmS53CalmCalmCalm64555
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1 day ago3NE7CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE84
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2 days agoS43W3CalmCalm3S4CalmSW3CalmCalmS4SW5SW3SW3S3CalmCalmCalmCalmCalmCalm54

Tide / Current Tables for Olympia, Washington
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Olympia
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Sat -- 12:09 AM PDT     Moonrise
Sat -- 06:20 AM PDT     Sunrise
Sat -- 07:07 AM PDT     1.27 feet Low Tide
Sat -- 02:14 PM PDT     11.45 feet High Tide
Sat -- 03:39 PM PDT     Moonset
Sat -- 07:12 PM PDT     7.36 feet Low Tide
Sat -- 08:06 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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12.81210.38.25.83.621.31.73.25.27.59.510.911.411.210.49.287.47.78.810.311.7

Tide / Current Tables for Nisqually Reach, Washington Current
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Nisqually Reach
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Sat -- 12:08 AM PDT     Moonrise
Sat -- 03:35 AM PDT     -1.09 knots Max Ebb
Sat -- 06:19 AM PDT     Sunrise
Sat -- 07:26 AM PDT     0.00 knots Slack
Sat -- 10:25 AM PDT     0.88 knots Max Flood
Sat -- 01:47 PM PDT     -0.00 knots Slack
Sat -- 03:38 PM PDT     Moonset
Sat -- 04:35 PM PDT     -0.47 knots Max Ebb
Sat -- 07:53 PM PDT     0.00 knots Slack
Sat -- 08:06 PM PDT     Sunset
Sat -- 10:26 PM PDT     0.50 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.2-0.5-0.9-1.1-1.1-0.9-0.6-0.20.20.60.90.80.60.2-0.1-0.3-0.4-0.5-0.4-0.200.30.50.4

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 (21,6,7,8)
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Ground Weather Radar Station Portland, OR
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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.