Sunday, April22, 2018 L-36.com


Marine Weather and Tides
Onalaska, WA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:08AMSunset 8:12PM Sunday April 22, 2018 2:54 PM PDT (21:54 UTC) Moonrise 10:55AMMoonset 1:26AM Illumination 51% Phase: First Quarter Moon; Moon at 7 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- 239 Pm Pdt Sun Apr 22 2018
In the main channel..Combined seas 4 to 6 ft through Monday. However, seas will temporarily build to near 7 ft during the ebb around 1145 pm Sunday, near 8 ft during the ebb around noon Monday, and near 7 ft during the ebb around 1245 am Tuesday.
PZZ200 239 Pm Pdt Sun Apr 22 2018
Synopsis for southern washington and northern oregon coast.. Thermal low pressure along the coast will continue through tonight then shift over the waters Mon. The summer-like northerly wind will shift to northeasterly Mon. A southerly wind reversal in the middle of the week could bring gusty winds.

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 222153
afdsew
area forecast discussion
national weather service seattle wa
253 pm pdt Sun apr 22 2018

Synopsis An offshore upper ridge will build into the pacific
northwest on Monday and remain there through Thursday, bringing a
stretch of sunny days to western washington. Low level offshore
flow will result in the warmest weather since last september,
with highs in the 70s over much of the area. An upper trough will
bring a return to more seasonal weather Friday and the weekend.

Short term Dry northerly flow aloft has developed over western
washington this afternoon ahead of the upper level ridge building
over the offshore waters of the pacific northwest. There is still
some fair weather cumulus over the area, but it is a mostly sunny
afternoon with temperatures in the 50s to lower 60s.

The upper ridge axis will move east to the coast tonight, and low
level flow will turn to a weak northerly offshore gradient. Fairly
light winds and clear skies will allow for good radiation
conditions, and overnight lows should be in the mid 30s to lower
40s with patchy morning fog in the usual spots.

The upper ridge will continue building as it shifts inland Monday.

It will continue slowly eastward Tuesday and Wednesday, but
continue to dominate our weather. Offshore flow will strengthen
as a thermally induced surface trough extends northward along the
pacific northwest coast. The 500 mb height over western washington
will be around 5730 meters Monday through Wednesday; the 850 mb
temperature will rise from around +7c on Monday to around +14c on
Wednesday. As we have been advertising for several days now, this
will result in sunny warm days with highs well into the 70s over
much of the area. Mcdonnal

Long term The models are a little inconsistent -- and hence
there is some uncertainty -- with regard to the transition from
the warm weather to a more typical spring pattern. The models
agree that the upper ridge will shift further east late in the
week, and an offshore closed upper low will begin moving east
toward northern california; that will induce a switch to onshore
flow across western washington and bring a chance of showers to
the area in the high-based instability with southerly flow aloft.

The difference in the models is primarily the timing of this
transition, with the GFS showing a switch to onshore flow
beginning Thursday afternoon, and the ECMWF delaying that until
Thursday night. For now we will stick with the current forecast,
which reflects the slower timing of the ecmwf. The models all
agree that the right forecast for Friday through Sunday is onshore
flow and a chance of showers as the low moves inland, followed
most likely by another trough from the west during the weekend.

Mcdonnal

Aviation An upper ridge will bring dry stable air with just some
patchy late night morning fog or low clouds... Otherwise mostly
clear. The flow aloft is northwesterly.

Ksea... Mostly clear with a northerly breeze.

Marine Northerly flow, mainly 5-15kt. Thermally induced low
pressure will set up along the oregon and washington coasts and
persist into Wednesday morning. We will probably see small
craft advisory easterly winds at the west entrance to the strait of
juan de fuca by daybreak Tuesday. The thermal low pressure will
move inland later in the week with onshore flow and cooler marine
air pushing back into the area.

Climate It is a rarity to get 4 days or more in a row of 70
degree plus weather in seattle in april. In the 74 years of
records at sea-tac it has only happened 4 times (4 days in row 3
times and 5 days once). The last time it happened was the record
crushing 5 day streak from april 17-21, 2016 that included 4 days
in a row in the 80's. The other 4 day streaks occurred on april
24-27, 1995, april 26-29, 1987 and april 27-30, 1976. Even getting
a streak of 3 days in a row of 70 degree plus weather in april in
seattle is rare with only 6 streaks of 3 days in a row since
records started in 1945. Felton

Sew watches warnings advisories
Wa... None.

Pz... None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 33 mi55 min 50°F1026.8 hPa (-1.7)
TCNW1 - 9446484 - Tacoma, WA 54 mi55 min 55°F 48°F1028.6 hPa (-1.5)
TCMW1 - 9446482 - Tacoma Met, WA 54 mi55 min NNW 11 G 15

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chehalis-Centralia Airport, WA22 mi60 minN 8 G 1410.00 miFair59°F39°F48%1028.1 hPa

Wind History from CLS (wind in knots)
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Last 24hrNW86
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1 day agoCalmW4CalmCalmCalm3CalmCalmS3CalmS74W6CalmCalmCalmS3SW44
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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

Sun -- 02:25 AM PDT     Moonset
Sun -- 04:58 AM PDT     3.09 feet Low Tide
Sun -- 06:12 AM PDT     Sunrise
Sun -- 08:57 AM PDT     8.20 feet High Tide
Sun -- 11:57 AM PDT     Moonrise
Sun -- 02:46 PM PDT     First Quarter
Sun -- 06:05 PM PDT     0.12 feet Low Tide
Sun -- 08:08 PM PDT     Sunset
Sun -- 11:03 PM PDT     6.93 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
65.24.43.73.33.13.95.87.68.27.97.264.63.2210.40.10.72.44.46.26.9

Tide / Current Tables for Longview, Columbia River, Washington
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Longview
Click for Map
Sun -- 02:25 AM PDT     Moonset
Sun -- 03:28 AM PDT     -0.30 feet Low Tide
Sun -- 06:12 AM PDT     Sunrise
Sun -- 08:40 AM PDT     3.43 feet High Tide
Sun -- 11:57 AM PDT     Moonrise
Sun -- 02:46 PM PDT     First Quarter
Sun -- 05:37 PM PDT     -1.33 feet Low Tide
Sun -- 08:08 PM PDT     Sunset
Sun -- 10:29 PM PDT     1.94 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.50-0.3-0.20.21.22.43.33.42.81.810.50.2-0.2-0.7-1.2-1.3-0.70.31.31.91.9

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 (17,4,5,8)
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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.