Thursday, February27, 2020
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Marine Weather and Tides
Cannon Beach, OR

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:52AMSunset 5:57PM Thursday February 27, 2020 4:57 AM PST (12:57 UTC) Moonrise 9:02AMMoonset 10:09PM Illumination 16% Phase: Waxing Crescent; Moon at 4 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- 245 Am Pst Thu Feb 27 2020
.small craft advisory in effect through this evening...
Today..N wind 5 to 10 kt, rising to 10 to 15 kt in the afternoon. Wind waves N 2 ft at 4 seconds. W swell 10 ft at 14 seconds. Patchy fog early in the morning.
Tonight..N wind 5 to 10 kt. Gusts to 15 kt in the evening. Wind waves N 1 ft at 4 seconds. W swell 9 ft at 13 seconds.
Fri..SW wind 5 to 10 kt, becoming S 15 to 20 kt in the afternoon. Wind waves S 2 ft at 4 seconds. W swell 7 ft at 12 seconds. Rain.
Fri night..W wind 20 to 25 kt. Gusts to 30 kt after midnight. Wind waves W 5 ft at 6 seconds. W swell 11 ft at 12 seconds. Showers and a slight chance of tstms.
Sat..W wind 10 to 15 kt. Gusts to 20 kt in the morning. Wind waves W 3 ft at 5 seconds. W swell 13 ft at 13 seconds. Chance of showers and a slight chance of tstms.
Sat night..NW wind 10 to 15 kt with gusts to 20 kt. Wind waves nw 3 ft at 4 seconds. W swell 11 ft at 15 seconds. Chance of showers.
Sun..W wind 10 to 15 kt. Wind waves 3 ft. NW swell 10 ft.
Mon..W wind 20 to 25 kt. Wind waves 3 ft. NW swell 8 ft.
PZZ200 245 Am Pst Thu Feb 27 2020
Synopsis for the southern washington and northern oregon coast.. High pressure will remain over the pac nw waters today then weakens Fri as a cold front approaches. Thermal low will remain along the north california and south oregon waters today then weakens tonight and shifts inland Fri. The cold front moves through the waters Fri afternoon. Unsettled conditions continue over the weekend.


7 Day Forecast for Marine Location Near Cannon Beach, OR
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location: 45.83, -123.94     debug


Area Discussion for - Portland, OR
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FXUS66 KPQR 271100 AFDPQR

Area Forecast Discussion National Weather Service Portland OR 259 AM PST Thu Feb 27 2020

SYNOPSIS. Weak high pressure will maintain dry weather through Friday morning. A cold front will return rain and mountain snow Friday afternoon and night. A cold upper trough will continue showers Saturday into Sunday morning as snow levels lower to 1500 to 2000 feet. Thunderstorms and small hail is possible with these showers. A series of surface fronts will result in chances for rain through the middle of next week.

SHORT TERM. Today through Saturday Night . There are minimal clouds inland early this morning with low clouds and fog over the waters and along the immediate coast. Light onshore winds are advecting low marine clouds into some of the valleys of Pacific County and along the lower Columbia River. However, offshore winds are developing across NW Oregon as an inverted trough along the south Oregon coast is moving north. These offshore winds are keeping the low clouds just offshore of the central Oregon coast, and should limit the inland expansion of marine stratus for the north Oregon and south Washington coastal areas this morning.

Further inland, satellite imagery shows signs of radiation fog and low clouds forming in the interior valleys of Lane County. The winds will likely be too light inland to prevent these low clouds from expanding into Linn County this morning. The low clouds should inland by mid-day, and inland temperatures should warm into the upper 50s this afternoon with some spots possibly peaking in the lower 60s.

Onshore winds return early Friday morning allowing marine clouds to move inland onto the coast. The winds will have a southerly component to it which may result in the marine clouds pushing into and up the Willamette Valley from the south. A slightly deeper marine layer will likely result in a slower clearing of the morning clouds. Mid and higher level clouds will fill in from the west Friday afternoon as a front approaches. The cloudy skies will result in less hours of sunshine on Friday for slightly cooler afternoon temperatures. Rain will move onto the coast late Friday afternoon pushing inland in the evening as the cold front moves inland.

Cooler air behind the front will lower snow levels below the Cascade passes Friday night into Saturday morning as an upper trough continues showers into the evening. The snow levels are expected to lower to around 2000 feet late Saturday morning. Models suggest that there will be enough instability to support a slight chance for thunderstorms along the coast Friday night and Saturday morning, and inland Saturday afternoon. Small hail is likely with these showers. The front will also support breezy south to southwest winds Friday night into Saturday morning.

From Friday night to Saturday afternoon, up to 2 inches of snow is possible for the higher elevations of the coast range and Cascade foothills, with 3 to 5 inches of snow expected for the Cascades. Rainfall totals of 0.5 to 0.75 inches is expected for the coast, coastal mountains and Cascade foothills (below 2000 feet), with around 0.25 inch of rain possible for the interior valleys.

Showers continue Saturday night as cooler air lowers snow levels down to around 1500 feet. The showers should become less frequent and widespread and limit the threat for accumulating snow. ~TJ

LONG TERM. No Changes Previous discussion follows. Sunday through Wednesday . Medium range models and their respective ensembles show ridging will build offshore Sunday. This should largely bring showers to an end by late Sunday afternoon as a short-wave ridge replaces the departing shortwave trough. The upper ridge will continue building into the Gulf of Alaska thus bringing northwest flow aloft. The general model consensus will push a couple disturbances across the region, although, these appear to be somewhat weak with our area staying on the warmer side of the storm track. Temperatures will hover close to normals in the lower 50s, but remain just below the 30 year norm. WIll probably see some additional snow pack building but nothing overly impactful to travel. Have fairly solid model consensus that the upper ridge will drift east over the region to likely bring a dry, cloudy morning and decent clearing by afternoon. /JBonk

AVIATION. Dry and stable air mass leading to spots of shallow fog/stratus. From about KTMK northward LIFR conditions will continue this morning as a surface ridge of high pressure remains there. South of KTMK light offshore flow south of the ridge will should bring primarily VFR conditions. However low stratus will be just offshore. Inland mostly clear skies and light winds should lead to increasing fog this morning as temperature- dew point spread narrows. Expect fog/stratus to dissipate around 18Z. For tonight, similar pattern continues so will probably see fog develop late tonight.

KPDX AND APPROACHES . VFR conditions is expected to give way to IFR fog this morning. However light east wind at KTTD and KPDX may hold off fog/stratus development for a while, or possibly even prevent it. Satellite fog product does not show fog along the Columbia River between KKLS and KPDX yet. That's another reason to delay fog development. What ever develops should dissipate by 18-19Z. /mh

MARINE. Forecast on track and little changes needed. High pressure over the waters with a thermally-induced surface trough extending from the north California waters to near Newport. Will see an increase in northerly winds this afternoon for the central coastal waters, but do not think it will exceed 20 kt. Surface gradient weakens tonight as a frontal system approaches the area. The 00Z guidance indicates small craft advisory wind develops over PZZ270 by early Fri afternoon and then extends to the rest of the area by 00Z Sat. There is the possibility of 35 kt gusts over the north part of PZZ270 Fri evening per NAM12 model. Post- frontal north wind occurs late Sat and continues through Sun.

Seas will hover around 10 ft through Thu evening and then briefly subside to around 8 ft late Thu night and Fri morning. However, wave heights build up to 15 ft late Fri through Sat. This will bring an enhanced risk of sneaker waves. ENP guidance shows another surge of 20 ft or greater seas directed at the Washington coast next Tue night, with 15 to 18 ft seas over the south Washington and north Oregon coastal waters. The current forecast for Tue and Tue night is 2 to 4 ft lower than current ENP wave model based on ECMWF and GWES Probabilistic Wave Height guidance. /mh

PQR WATCHES/WARNINGS/ADVISORIES. OR . None. WA . None. PZ . Small Craft Advisory until 10 PM PST this evening for coastal waters from Cape Shoalwater WA to Florence OR out 60 NM.

Small Craft Advisory until 9 AM PST this morning for Columbia River Bar.

Interact with us via social media: www.facebook.com/NWSPortland www.twitter.com/NWSPortland

This discussion is for Northwest oregon and Southwest Washington from the Cascade crest to 60 nm offshore. This area is commonly referred to as the forecast area.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 19 mi58 min 49°F1032.3 hPa (-0.7)
46243 - Clatsop Spit, OR - 162 28 mi28 min 46°F8 ft
ASTO3 - 9439040 - Astoria, OR 28 mi58 min Calm G 1.9 40°F 43°F1032.1 hPa (-0.4)
46029 - COL RIVER BAR - 20NM West of Columbia River Mouth 36 mi68 min NNE 3.9 G 5.8 42°F 46°F8 ft1032.5 hPa (-0.5)42°F
46248 - Astoria Canyon, OR (179) 43 mi28 min 49°F8 ft

Wind History for Garibaldi, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Astoria, Astoria Regional Airport, OR23 mi63 minNE 40.25 miFog39°F37°F96%1032.1 hPa

Link to 5 minute data for KAST

Wind History from AST (wind in knots)
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Last 24hrCalmCalmCalmSE3E4N6CalmNE4N6N5N4N6N4W4W5NW5S33N3CalmE3N5CalmNE4
1 day agoE6CalmE4SE3CalmNE5NE4N6NE4N43N3NW4W3S3CalmE3E3SE4SE6CalmSE3CalmCalm
2 days agoSW3W8S3SE4CalmCalmNW5W5W7SW7SW5W6W4CalmS3E3CalmE3E3CalmCalmCalmCalmSE3

Tide / Current Tables for Nehalem, Nehalem River, Oregon
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Nehalem
Click for Map
Thu -- 03:04 AM PST     6.62 feet High Tide
Thu -- 06:58 AM PST     Sunrise
Thu -- 09:01 AM PST     Moonrise
Thu -- 09:48 AM PST     1.39 feet Low Tide
Thu -- 03:04 PM PST     6.05 feet High Tide
Thu -- 05:58 PM PST     Sunset
Thu -- 09:49 PM PST     1.10 feet Low Tide
Thu -- 10:09 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.34.96.16.66.45.64.53.32.21.61.423.14.55.66.15.85.14.131.91.31.11.6

Tide / Current Tables for Brighton, Nehalem River, Oregon
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Brighton
Click for Map
Thu -- 02:38 AM PST     7.27 feet High Tide
Thu -- 06:58 AM PST     Sunrise
Thu -- 08:46 AM PST     1.85 feet Low Tide
Thu -- 09:01 AM PST     Moonrise
Thu -- 02:38 PM PST     6.64 feet High Tide
Thu -- 05:59 PM PST     Sunset
Thu -- 08:47 PM PST     1.46 feet Low Tide
Thu -- 10:09 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.96.37.17.26.65.54.12.92.11.92.43.44.65.86.56.6653.72.51.71.523

Weather Map
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wmap_P
GEOS 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 Portland, OR (7,2,3,4)
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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 numerous 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.