Thursday, March30, 2017 L-36.com


Marine Weather and Tides
Seaside, OR

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:53AMSunset 7:39PM Wednesday March 29, 2017 11:38 PM PDT (06:38 UTC) Moonrise 7:14AMMoonset 8:54PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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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PZZ250 Coastal Waters From Cape Shoalwater Wa To Cascade Head Or Out 10 Nm- Waters From Cape Shoalwater Wa To Cascade Head Or From 10 To 60 Nm- 830 Pm Pdt Wed Mar 29 2017
.small craft advisory for hazardous seas in effect through Thursday morning...
Tonight..W wind 10 to 15 kt with gusts to 20 kt. Wind waves W 4 ft at 5 seconds. W swell 11 ft at 14 seconds.
Thu..NW wind 10 to 15 kt with gusts to 20 kt. Wind waves nw 4 ft at 5 seconds. W swell 8 ft at 13 seconds.
Thu night..NW wind 10 to 15 kt...easing to 10 kt or less after midnight. Wind waves nw 2 ft at 4 seconds. W swell 7 ft at 13 seconds.
Fri..S wind 5 to 10 kt. Gusts to 15 kt in the afternoon. Wind waves S 2 ft at 4 seconds. W swell 7 ft at 14 seconds.
Fri night..S wind 5 to 10 kt. Wind rising to 10 to 15 kt with gusts to 20 kt after midnight. Wind waves S 3 ft at 5 seconds. W swell 6 ft at 13 seconds.
Sat..SW wind 10 to 15 kt with gusts to 20 kt. Wind waves 3 ft. W swell 7 ft.
Sat night..N wind 10 to 15 kt with gusts to 20 kt. Wind waves 3 ft. W swell 8 ft.
Sun..NW wind 15 to 20 kt. Wind waves 4 ft. W swell 14 ft.
Mon..W wind 10 to 15 kt. Wind waves 3 ft. W swell 12 ft.
PZZ200 830 Pm Pdt Wed Mar 29 2017
Synopsis for southern washington and northern oregon coast.. High pres will build over the waters tonight and remain through Fri. A weak front will move across the waters Sat morning. High pres builds from the W Sat afternoon through Sun.

7 Day Forecast for Marine Location Near Seaside, OR
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location: 46, -123.92     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 300336
afdpqr
area forecast discussion
national weather service portland or
834 pm pdt Wed mar 29 2017

Synopsis Showers will continue tonight then decrease later
Thursday as an upper level trough of low pressure moves east of the
region. Fri is expected to be dry as high pres moves across the
region, then chances for rain return for the weekend as
the next system moves in.

Short term Tonight through Saturday... Showers on radar do not look
very impressive but there were some decent cells in NE clark county
and western skamania co. Around 5 pm. Rainfall amounts over the last
6 hours in the 2 to 3 tenths of an inch in the mountains and less
then 2 tenths on the valleys. There were some spots in the lane co.

Cascades with 5 to 7 tenths of an inch. Satellite shows cold topped
clouds offshore that are tracking to the coast and is expected to
increase shower activity some around midnight. Once the feature
swings through the area will be on the back side of the upper trough
with flow turning more northwesterly. Showers will be deceasing
during the day but orographic lift will keep showers activity going
in the mountains into Thursday evening.

The trailing upper level trough is expected to move across thu
morning, with moisture generally limited to low levels below about
8k feet. Once the upper trough passes, shower activity is expected
to become more reliant on orographic lift and thus will tend to
become more tied to the upwind side of the mountains into Thursday
evening. Thu night into Fri a ridge of high pres at the surface and
aloft pushes east into western oregon and washington. Subsidence will
stabilize the atmosphere, bringing an end to the showers. Low levels
will be slow to dry out, though, as offshore flow never really gets
going. Some fog Friday morning seems inevitable given all of the
moisture around, but will depend on low level flow either being very
light, which it should be, or being onshore, which is questionable.

It looks like there may be some offshore drift that prevents fog
along at least the central coast and possibly elsewhere.

The next system approaches Saturday and looks like it will produce
some light rain over the area, mainly in the northwestern portions of
the local forecast area with surface low pressure off vancouver
island. However moisture looks fairly limited, so not expecting any
impressive or terribly significant rain. Could even see some sun,
particularly during the morning hours. Bowen /mh

Long term Saturday night through Wednesday... Models are in fairly
good agreement through about Monday with a weak upper trough moving
through the area for a continued low chance of showers. After Monday,
though, models diverge, with a wetter system moving into the area
sometime between Tuesday and Thursday. Overall, though, the extended
doesn't look as wet as the trend has been. Bowen

Aviation Much improved flight conditions this evening compared
to earlier in the day. MainlyVFR in the interior valleys at 03z,
especially from the est slopes of the oregon coast range to the
center of the willamette valley. Likely more MVFR in the cascade
foothills due to orographic up-slope flow. Areas from the oregon
coast range to the beaches are mainly ifr. Expect primarilyVFR
to prevail over the inland lowlands through about 10z then shift
to more MVFR as the upper trough moves across the area. Coastal
sites likely to remain primarily MVFR, with areas of ifr through
10z or so. Cascades and highest elevations of the oregon coast
range and SW washington willapa hills to remain obscured through
at least early Thu afternoon. All TAF sites expected to beVFR by
19z thu.

Pdx and approaches...VFR conditions at the terminal and vicinity
as of 03z. This to continue through at least 09z. Upper trough
moves over the area around 10z, which may enhance the chance of
MVFR conditions.VFR prevails by mid-morning and continues
through Thu evening. Weishaar

Marine Minimal changes to current forecast. Frontal passage
occurred shortly after 00z thu, resulting in wind shift to the
nw. Wind speeds generally 15 kts or less, but getting a few gusts
into the low 20s this evening. NW wind continues over the waters
through Thu night. The 18z GFS was a little stronger with
boundary layer wind speeds compared to the nam. Leaned toward the
nam and namnest, which keeps gusts Thu below small craft advisory
thresholds. However, would not be surprised if 20 to 25 kt gusts
developed, especially Thu morning.

High pres settles over the waters Thu night and fri, reducing
wind speeds to 10 kt or less. Small craft advisory wind likely to
return to the north outer waters Fri night.

Extended the small craft advisory for hazardous seas through 18z
thu. Seas subside to the 5 to 6 ft range by Fri afternoon. Next
threat of 10 ft seas looks to occur Sat night. Weishaar

Pqr watches/warnings/advisories
Or... None.

Wa... None.

Pz... Small craft advisory for hazardous seas until 11 am pdt
Thursday for coastal waters from CAPE shoalwater wa to
florence or out 60 nm.

Small craft advisory for rough columbia river bar until 9 am
pdt Thursday.

Small craft advisory for rough columbia river bar from 4 pm to
8 pm pdt Thursday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ASTO3 - 9439040 - Astoria, OR 16 mi51 min W 6 G 8 46°F 47°F1018.8 hPa
46243 - Clatsop Spit, OR - 162 19 mi39 min 47°F10 ft
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 31 mi51 min 51°F1019.7 hPa
46248 - Astoria Canyon, OR (179) 39 mi39 min 50°F11 ft
TOKW1 - 9440910 - Toke Point, WA 49 mi51 min WNW 11 G 19 46°F 50°F1018.5 hPa

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Astoria, Astoria Regional Airport, OR11 mi44 minW 510.00 miOvercast46°F39°F79%1018.5 hPa

Wind History from AST (wind in knots)
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Last 24hrSE6SE7SE34S16
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2 days agoSW5S8SW11
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Tide / Current Tables for Seaside, 12th Avenue bridge, Necanicum River, Oregon
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Seaside
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Thu -- 02:25 AM PDT     6.04 feet High Tide
Thu -- 06:58 AM PDT     Sunrise
Thu -- 08:49 AM PDT     Moonrise
Thu -- 10:14 AM PDT     -0.18 feet Low Tide
Thu -- 03:11 PM PDT     5.20 feet High Tide
Thu -- 07:42 PM PDT     Sunset
Thu -- 10:17 PM PDT     0.42 feet Low Tide
Thu -- 11:07 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.14.95.965.44.53.32.110.2-0.20.11.434.55.254.53.62.51.50.80.40.7

Tide / Current Tables for Warrenton, Skipanon River, Columbia River, Oregon
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Warrenton
Click for Map
Thu -- 03:20 AM PDT     9.18 feet High Tide
Thu -- 06:58 AM PDT     Sunrise
Thu -- 08:49 AM PDT     Moonrise
Thu -- 09:50 AM PDT     -0.44 feet Low Tide
Thu -- 04:07 PM PDT     8.02 feet High Tide
Thu -- 07:42 PM PDT     Sunset
Thu -- 09:52 PM PDT     1.09 feet Low Tide
Thu -- 11:08 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.46.68.39.18.97.65.53.21.2-0.1-0.40.31.945.97.487.66.24.42.61.51.11.7

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 (2,6,7,8)
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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.