Wednesday, June28, 2017 L-36.com


Marine Weather and Tides
Onalaska, 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 5:19AMSunset 9:11PM Wednesday June 28, 2017 7:02 PM PDT (02:02 UTC) Moonrise 9:51AMMoonset 11:25PM Illumination 25% Phase: Waxing Crescent; Moon at 5 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- 234 Pm Pdt Wed Jun 28 2017
.small craft advisory for rough columbia river bar in effect from 7 pm this evening to midnight pdt tonight...
.small craft advisory for rough columbia river bar in effect Thursday morning...
In the main channel..Combined seas 5 ft tonight and 4 ft Thursday. However, seas temporarily near 7 ft with breakers likely during the ebb around 930 pm this evening, and near 8 ft with breakers likely during the ebb around 930 am Thursday morning.
PZZ200 234 Pm Pdt Wed Jun 28 2017
Synopsis for southern washington and northern oregon coast.. Little change in overall weather pattern through the coming weekend. High pres will remain over the ne pac. Thermal low pres will remain over mainly nw california. Pres gradients will strengthen later Sun and Mon, with a bit more in the way of gusty N winds and choppy seas.

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 282135
afdsew
area forecast discussion
national weather service seattle wa
230 pm pdt Wed jun 28 2017

Synopsis A surface ridge offshore will maintain onshore flow into
early next week. This will produce typical early summer weather with
mild temperatures, morning low clouds, and afternoon sunshine. An
upper level ridge will weaken the onshore flow and produce a minor
warming trend Thursday and Friday. Stronger onshore flow will bring
more cloud cover this weekend, and possibly light rain to the coast.

Short term Satellite imagery shows that while the northern third
of western washington has cleared out nicely, the rest of the region
has been slow to clear. There has been clearing from the edges, so
some hours of mostly clear conditions are likely for the seattle
metro area this evening, even if the southwest interior remains
mostly cloudy. For tonight have a partly cloudy forecast for most
areas, except mostly cloudy on the coast.

The upper level ridge offshore will slowly move east tonight and
Thursday. The 500 mb heights will rise over the area with the ridge
axis just offshore; heights will be in the low to mid 580s. Low
level onshore flow will weaken, resulting in less morning cloud
cover for the interior Thursday morning. With less cloud cover and
the warming temperatures aloft, highs on Thursday will be a few
degrees warmer with mid and upper 60s on the coast and widespread
70s over the interior.

The upper level ridge will move through the area Thursday night into
Friday morning and will be just east of the area Friday afternoon.

Onshore pressure gradients don't begin to increase again until
Friday afternoon, giving a mostly sunny day across most of the area
on Friday. Friday will be the warmest day in the forecast period
with mostly lower 80s from seattle south. North of seattle 70s
will be common with highs near 70 on the coast.

Heights fall on Saturday as an upper trough moves through. Highs
will fall into the 70s, 60s coast, but the GFS and in fact all
models are stubbornly dry with this weak upper trough. Have kept a
mostly sunny forecast going on Saturday but there could be at least
morning clouds. The surface gradient is forecast to be strongly
onshore Friday night into Saturday which would imply a fair amount
of cloudiness. Burke

Long term The upper pattern Sunday through Tuesday has a weak
trough over the area. At the surface the flow is moderate to strong
onshore. There will be morning clouds and possibly afternoon sun
each day, with highs in the low to mid 70s. Have limited any nonzero
pops to the coast. Wednesday looks a bit warmer as heights rise and
onshore surface flow weakens. Burke

Aviation Upper level high pressure offshore will slowly make its
way eastward today with flow aloft mainly from the northwest through
Thursday. Low level flow will remain onshore. Low level stratus are
hanging on longer than initially anticipated... But current satellite
trends show that burn off is starting to kick in and would expect
skies to start to clear as mid-afternoon approaches. Thus... Cigs
likely to remain MVFR for a little bit longer before scattering out
after 22z-ish. Clearing skies will prevail for the remainder of the
afternoon and into the overnight hours before another low stratus
deck can be expected to roll over the area early Thursday morning.

Ksea... Above discussion applies. Winds southwesterly 6-10 kts
turning northerly by this evening before becoming light and
variable overnight. Smr

Marine Higher pres offshore with lower pres E of the cascades
will maintain onshore flow of varying strength through the week.

Most recent model data shows SCA winds over the strait by late this
afternoon... So posted the advisory with morning package and that
still looks good. SCA winds may return for the strait thu
evening night as well. Strengthening onshore flow Friday afternoon
and evening still looks like it may result in gales for portions of
the strait... But will leave for next shift to determine whether or
not to post a watch. Winds over remaining waters look to be fairly
uneventful in the near term... Although models hint that winds over
the coastal waters may approach SCA thresholds Friday evening.

Sew watches warnings advisories
Wa... None.

Pz... Small craft advisory for central and east strait late this
afternoon and tonight.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 33 mi44 min 64°F1018.3 hPa
TCNW1 - 9446484 - Tacoma, WA 54 mi50 min 66°F 54°F1017.6 hPa
TCMW1 - 9446482 - Tacoma Met, WA 54 mi44 min W 5.1 G 11

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chehalis-Centralia Airport, WA22 mi67 minVar 410.00 miFair66°F53°F64%1018.3 hPa

Wind History from CLS (wind in knots)
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Last 24hrW5--SW4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm3CalmCalmCalm5SW5SW4NW6NW6NW7
1 day agoW9
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633CalmCalmCalmCalmCalmS4CalmCalmCalmCalmSW3CalmS543Calm3E5Calm5
G11
2 days agoW7
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5SW6SW4SW53SW4CalmCalmCalmCalmCalmS6SW4SW4SW4Calm556
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G16

Tide / Current Tables for Longview, Washington - IGNORE HEIGHTS
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Longview
Click for MapNote: The Columbia River is subject to annual freshets. Short range predictions are available at local river forecast centers. The data for stations above Harrington Point apply only during low river stages. There is a tidal influence along most of the

Wed -- 03:28 AM PDT     2.13 feet Low Tide
Wed -- 05:23 AM PDT     Sunrise
Wed -- 07:23 AM PDT     8.38 feet High Tide
Wed -- 10:53 AM PDT     Moonrise
Wed -- 04:03 PM PDT     -0.71 feet Low Tide
Wed -- 08:48 PM PDT     8.02 feet High Tide
Wed -- 09:06 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.73.62.72.22.44.36.78.28.37.66.44.93.31.80.5-0.4-0.70.22.65.37.487.66.8

Tide / Current Tables for Longview, Columbia River, Washington
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Longview
Click for Map
Wed -- 02:12 AM PDT     0.88 feet Low Tide
Wed -- 05:23 AM PDT     Sunrise
Wed -- 06:55 AM PDT     4.86 feet High Tide
Wed -- 10:53 AM PDT     Moonrise
Wed -- 03:12 PM PDT     -0.45 feet Low Tide
Wed -- 08:07 PM PDT     4.10 feet High Tide
Wed -- 09:07 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.20.91.12.13.44.54.94.43.42.621.50.80.1-0.4-0.20.92.43.64.13.83.22.6

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 (22,6,7,8)
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Ground Weather Radar Station Portland, OR
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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.