Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Cedar Mill, 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 7:38PM Wednesday March 29, 2017 7:36 PM PDT (02:36 UTC) Moonrise 7:09AMMoonset 8:48PM Illumination 7% 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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PZZ210 Columbia River Bar- 216 Pm Pdt Wed Mar 29 2017
.small craft advisory for rough columbia river bar in effect through late tonight...
In the main channel..Combined seas 10 to 12 ft through this evening. However...seas will temporarily build to near 15 ft with breakers during the ebb around 645 pm this evening. Seas to 14 ft...with breakers...can be expected with the ebb around 700 am Thursday morning.
PZZ200 216 Pm Pdt Wed Mar 29 2017
Synopsis for southern washington and northern oregon coast.. A cold front will move through the waters this afternoon and then high pressure will build in behind it tonight and remain through Friday. A weak front will move across the waters Saturday morning.

7 Day Forecast for Marine Location Near Cedar Mill, OR
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location: 45.58, -122.77     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 292134
afdpqr
area forecast discussion
national weather service portland or
235 pm pdt Wed mar 29 2017

Synopsis A cold front will move inland tonight with showers
continuing into Thu as an upper level trough of low pressure moves
across the pacific nw. 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 This afternoon through Saturday... Observations this
afternoon place a weak cold front near astoria, stretching
southwestward to off the southern oregon coast. Not a ton of rain
associated with the front, but radar shows some light showers north
of salem. Stratiform rain associated with the earlier warm front is
lingering over the cascades from about mt. Jefferson south and will
taper off through the evening hours.

The trailing upper level trough is expected to move across thu
morning, with moisture generally limited to low levels below about
10k 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.

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

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 MVFR conditions for most TAF sites this afternoon.

Not sure exactly when the MVFR CIGS will clear the area. Should
have a better idea in the next few hours as the cold front moves
onshore. Given the wind shift at kast, expect frontal passage at
most TAF sites in then next 2 to 3 hours. Would expect this cold
front passage to improve CIGS and visibility toVFR, especially
given the amount of dry air behind the front (per goes-16 7.34u
channel). However, shallow moisture in cyclonic flow may be
sufficient enough to continue low cigs/drizzle well into the
overnight hours. Have put the best guess on cigs/visibility going
into the evening, but would not be surprised if lower
cigs/visibility persist.

Pdx and approaches... MVFR conditions will continue through the
evening. Expect the cigs/visibility to improve behind the cold
front, but confidence is not that high in that solution, and MVFR
conditions may continue well into the overnight hours. /bentley

Marine Using available surface, buoy, and satellite
observations, anticipate frontal passage to be through the
waters and onshore by 00z. Once this front does pass through,
winds will fall below 20 knots and shift to the west northwest
which should end any small craft for winds concerns. Long period
westerly swell will remain above 10 feet through at least
tomorrow morning, and once it falls below that level it should
remain there until the middle of the weekend. Another 12 to 14
foot long period swell will continue for the second half of the
weekend and into next week, but a lack of any significant surface
fronts or low pressure centers will limit any additional impact
from wind waves. /bentley

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

Wa... None.

Pz... Small craft advisory for winds until 5 pm pdt this afternoon
for coastal waters from CAPE shoalwater wa to florence or
out 60 nm.

Small craft advisory for hazardous seas until 5 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 5 am
pdt Thursday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 38 mi49 min 46°F1016.7 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 61 mi49 min 51°F1018.4 hPa
ASTO3 - 9439040 - Astoria, OR 68 mi49 min WNW 5.1 G 9.9 47°F 46°F1017.3 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi44 minW 1010.00 miPartly Cloudy56°F46°F72%1015.7 hPa
Portland, Portland International Airport, OR9 mi44 minWSW 1010.00 miPartly Cloudy57°F46°F67%1015.7 hPa
Portland, Portland-Hillsboro Airport, OR10 mi44 minW 810.00 miFair54°F44°F69%1016 hPa
Scappoose, Scappoose Industrial Airpark, OR14 mi44 minWNW 44.00 miLight Rain Fog/Mist51°F48°F89%1015.9 hPa
Portland, Portland-Troutdale Airport, OR20 mi44 minSW 710.00 miOvercast57°F50°F78%1015.5 hPa
Aurora, Aurora State Airport, OR23 mi44 minSW 910.00 miMostly Cloudy54°F45°F72%1016.7 hPa

Wind History from VUO (wind in knots)
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Last 24hrW5SW5SW8CalmE5CalmSE3SE6SE10
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1 day agoSW7SW55S4SE3S5SE3SE54SE46S65S6S8S8SE7S7S66S8S5SE4S3
2 days agoCalmCalmSE3SE5Calm3S3E3S5S6SW6S53SE6S7S7SW9SW7S7SW6W8SW9W10SW3

Tide / Current Tables for St. Johns, Willamette River, Oregon - IGNORE HEIGHTS
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St. Johns
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 -- 04:18 AM PDT     0.37 feet Low Tide
Wed -- 06:56 AM PDT     Sunrise
Wed -- 08:05 AM PDT     9.20 feet High Tide
Wed -- 08:09 AM PDT     Moonrise
Wed -- 04:50 PM PDT     -0.14 feet Low Tide
Wed -- 07:35 PM PDT     Sunset
Wed -- 08:38 PM PDT     8.55 feet High Tide
Wed -- 09:48 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.431.70.80.41.14.27.69.28.986.753.41.90.80.1-0.11.85.288.587

Tide / Current Tables for Vancouver, Washington - IGNORE HEIGHTS
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Vancouver
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 -- 04:30 AM PDT     0.37 feet Low Tide
Wed -- 06:55 AM PDT     Sunrise
Wed -- 08:08 AM PDT     Moonrise
Wed -- 08:42 AM PDT     9.20 feet High Tide
Wed -- 05:02 PM PDT     -0.14 feet Low Tide
Wed -- 07:35 PM PDT     Sunset
Wed -- 09:15 PM PDT     8.55 feet High Tide
Wed -- 09:47 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.13.52.110.50.72.96.28.69.28.67.45.842.41.10.2-0.10.93.86.88.58.47.6

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 Portland, OR (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.