Thursday, January18, 2018 L-36.com


Marine Weather and Tides
Altoona, 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 7:46AMSunset 4:58PM Wednesday January 17, 2018 9:39 PM PST (05:39 UTC) Moonrise 8:12AMMoonset 5:50PM Illumination 2% Phase: Waxing Crescent; Moon at 1 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- 908 Pm Pst Wed Jan 17 2018
.small craft advisory for rough columbia river bar in effect through late Thursday night...
In the main channel..Combined seas around 18 ft this evening, building to 22 ft late tonight and peaking near 25 ft late Thu morning. However, seas will temporarily build to 23 with the weaker ebb around 530 am Thursday and to around 25 ft with the ebb around 530 pm Thursday.
PZZ200 908 Pm Pst Wed Jan 17 2018
Synopsis for southern washington and northern oregon coast.. A 964 mb surface low will move north along 140 west longitude and be near haida gwaii by early Thursday. Very large swell generated by the strong low will reach the waters late tonight. Peak waves 30 to 35 feet will impact the waters and surf zone late tonight through Thursday morning. The active pattern continues into the weekend, with another round of strong gale force wind likely late Saturday night through Sunday morning, which will boost combined seas near 20 feet.

7 Day Forecast for Marine Location Near Altoona, WA
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location: 46.27, -123.65     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 180523
afdpqr
area forecast discussion
national weather service portland or
922 pm pst Wed jan 17 2018

Synopsis A cold front moving across the interior lowlands will
shift across the cascades overnight. An upper level trough of low
pres off the coast will then send a series of disturbances inland
through the end of the week, keeping the region in a cooler showery
pattern. Another front will move inland Sunday, bringing a round of
heavier rainfall and some mountain snow.

Short term Tonight through Saturday... Rain band associated with a
cold front now moving through the willamette valley and southwest
washington. Rainfall amount have been modest about 0.3" to 0.6" over
6 hours inland, and 0.7" to 1" in the coast range. The front should
be in the cascades around midnight with rain rates easing. A cooler
air mass will in place Thu so temperatures will be closer to normal
after near record high temperatures in the 60s today in some parts of
the cwa.

Cross sections of moisture indicate deep enough moisture to continue
with near 100 pops as the front moves through overnight, and will
retain categorical pops through the night into Thu morning with the
next shortwave moving through. Moist onshore flow continues through
fri and Fri night as a few more shortwaves move through keeping pops
in the likely to categorical range for showers. Model soundings
continue to indicate marginal instability, centered along and off the
coast Thu afternoon as the cold upper trough moves closer, so will
keep a slight chance for thunderstorms over the coastal areas then.

Have introduced a slight chance of thunderstorms over the outer
coastal waters Thu morning with instability moving in a little
earlier there.

Large seas associated with the deep surface low that is running up
towards the central bc coast tonight will arrive tonight and
continue through Thu before decreasing again Thu night. The system
bears a resemblance to a storm back on 10 dec 2015, where seas
topped out in the range of 31 to 32 ft with periods around 17
seconds, that wound up producing some property damage around depoe
bay and cannon beach. Buoy observations from 46002 and 46005, about
300 to 350 miles offshore support seas of that magnitude reaching the
coast thu.

Remainder of previous discussion unchanged...

on Sat weak ridging aloft initiates weak warm air advection. Will
keep likely pops in for what should transition to be more stratiform
precipitation. For the next few days with snow levels coming down
behind the front tonight, will see snow adding up in the cascades
again. At this time however, no system appears overly strong or
heavy, so accumulations through Sat should occur at rates under
advisory criteria.

Long term Saturday night through Wednesday... Active weather
continues through the weekend, with coast valley rain and mountain
snow. Will likely see a decent amount of snow in the cascades on
Sunday, with snow levels down around 3000 feet (below the passes).

Rain for everyone else means rivers will continue to rise through
Sunday. Transient ridge builds over the pacific northwest late
Monday into Tuesday likely means a break in the rain, but energy
riding over the top of the ridge means I kept a slight chance of
rain and clouds in the forecast for Monday night into Tuesday.

Another trough will bring more rain and another stretch of active
weather starting late Tuesday through the end of next week. -mccoy

Aviation MostlyVFR this evening will last much of the night,
but will see an increased threat of MVFR at the coast again
around 12z with additional rain. Inland areas will see generally
vfr with the same increased chance of MVFR but between about 12z
and 15z thu.

Pdx and approaches...VFR through much of tonight with increased
chances for another few hours of MVFR with additional rain
between about 12z and 15z Thursday. Bowen weishaar

Marine Post-frontal low-end gales continue. Although wind
gusts may temporarily drop below 35 kt, will likely want to keep
gale warning in place as winds are expected to pick up again
during the day Thursday. Seas have been slow to increase this
evening, with local buoys only ranging from 17 to 21 ft as of 9
pm. However, decaying the observed swell from both buoys 5 and 2
shows swell of 28-30 ft arriving at the coast Thursday morning,
so am still confident in very large waves. Upped forecast a bit
to account for these offshore observations - now expecting around
35 ft at buoy 89 and 30-32 ft at buoys 29 and 50 Thursday. See
the coastal flood warning for details on expected coastal
impacts.

Winds and seas diminish Friday, but will remain above 20 ft
through Friday evening, then lowering to the lower teens by 12z
sun. 12z model runs are in better agreement regarding the Sunday
system. Looks like gale force wind returns to pzz255 and pzz275
in the 06z-12z Sunday time frame and then move into the north
zones after 12z. Indicated gusts around 45 kt over pzz275 sun
morning. Winds will likely push seas back above 20 ft. Wind
speeds and seas settle down again early next week. Bowen weishaar

Pqr watches warnings advisories
Or... Coastal flood warning until midnight pst Thursday night for
central oregon coast-north oregon coast.

Wa... Coastal flood warning until midnight pst Thursday night for
south washington coast.

Pz... Gale warning until 4 pm pst Thursday for coastal waters from
cape shoalwater wa to florence or out 60 nm.

Small craft advisory for rough columbia river bar until 4 am
pst Friday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ASTO3 - 9439040 - Astoria, OR 8 mi52 min SSW 13 G 24 55°F 1007.3 hPa
46243 - Clatsop Spit, OR - 162 26 mi40 min 51°F20 ft
TOKW1 - 9440910 - Toke Point, WA 35 mi52 min SSW 24 G 32 49°F1006.5 hPa
LOPW1 - 9440422 - Longview, WA 39 mi52 min 44°F1009.1 hPa
46029 - COL RIVER BAR - 20NM West of Columbia River Mouth 45 mi50 min S 27 G 35 53°F 51°F19 ft1005.9 hPa (+0.3)50°F

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Astoria, Astoria Regional Airport, OR14 mi45 minSSW 22 G 338.00 miA Few Clouds and Breezy54°F46°F77%1007.5 hPa

Wind History from AST (wind in knots)
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Last 24hrSE3E7SE8SE6SE6SE7SE7SE5E5SE6S103SE11
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1 day agoSE5S9S10
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2 days agoE7CalmCalmE8E4CalmE7NE8E8E9NE6E4N10NE7
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SE10SE13SE6SE6E12SE9S3SE11
G18

Tide / Current Tables for Harrington Point, Columbia River, Washington
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Harrington Point
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Thu -- 02:59 AM PST     7.06 feet High Tide
Thu -- 07:51 AM PST     Sunrise
Thu -- 08:47 AM PST     Moonrise
Thu -- 08:59 AM PST     2.96 feet Low Tide
Thu -- 02:05 PM PST     8.15 feet High Tide
Thu -- 04:59 PM PST     Sunset
Thu -- 06:49 PM PST     Moonset
Thu -- 09:37 PM PST     -0.33 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.35.16.57.16.75.94.93.93.233.44.76.37.68.17.86.85.23.41.80.6-0.2-0.30.7

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
Click for Map
Thu -- 03:07 AM PST     7.62 feet High Tide
Thu -- 07:50 AM PST     Sunrise
Thu -- 08:46 AM PST     Moonrise
Thu -- 09:05 AM PST     2.72 feet Low Tide
Thu -- 02:13 PM PST     8.68 feet High Tide
Thu -- 04:59 PM PST     Sunset
Thu -- 06:49 PM PST     Moonset
Thu -- 09:43 PM PST     -0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.45.46.97.67.36.45.243.12.73.24.66.47.98.78.47.45.842.30.90.1-0.10.8

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 Portland, OR (0,6,7,8)
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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.