Thursday, September23, 2021
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Marine Weather and Tides
Westport, OR

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:59AMSunset 7:08PM Thursday September 23, 2021 11:07 AM PDT (18:07 UTC) Moonrise 7:35PMMoonset 8:46AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 738 Am Pdt Thu Sep 23 2021
In the main channel.. - general seas...5 to 7 feet through Thursday, subsiding to 3 to 5 ft Friday morning. - first ebb...around 715 pm Thursday, with seas to 9 ft. - second ebb...around 715 am Friday, with seas to 5 ft - third ebb...around 715 am Friday, with seas to 5 ft
PZZ200 738 Am Pdt Thu Sep 23 2021
Synopsis for the southern washington and northern oregon coast.. Northerly winds will persist across the waters through Friday night as high pressure builds over the pacific northwest. A frontal system will push across the waters Saturday evening through Sunday and bring southerly winds.


7 Day Forecast for Marine Location Near Westport, OR
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location: 46.15, -123.31     debug


Area Discussion for - Portland, OR
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FXUS66 KPQR 231733 AAB AFDPQR

Area Forecast Discussion . UPDATED National Weather Service Portland OR 1032 AM PDT Thu Sep 23 2021

Updated Aviation Discussion

SYNOPSIS. High pressure will build in the post frontal environment today causing conditions to dry and warm. Expecting warmest temperatures on Friday before the ridge flattens on Saturday with the advancement of a weak trough. More active weather expected Sunday through mid-week with increasing chances for rain and cooler temperatures.

SHORT TERM /THROUGH SATURDAY/. Satellite continues to show stratus dissipating this evening and in turn, radiational cooling has increased. Already starting to see fog along the coast, and low stratus is beginning to fill in along the Columbia River moving west to east. Dew point depressions are generally around 4 degrees which for many locations is too large of a spread for fog to form. However, as cooling conditions, chances increase. Will continue to monitor but fog development will be quite variable this morning.

Through Friday, weather will be quite settled as high pressure builds in the post frontal environment. This high pressure will establish a thermally induced low at the surface. Temperatures will slowly rise through the end of the work week. Expecting near normal high temperatures today with northerly winds. Friday will be warmer with high temperatures around 75-80 along the coast and even warmer inland where temperatures in the Willamette Valley will exceed 80 degrees. Could see breezy afternoon winds.

On Saturday, the ridge will begin to flatten as a weak short wave trough aloft advances towards the region. This short wave will prime the environment for more active weather beginning on Sunday. -Muessle

LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/. More active weather is expected in the long term starting on Sunday and into early next week. The short wave mentioned in the previous discussion will push eastward overnight into Sunday, and a long wave trough stemming from a closed low off of the BC coast will intensify. This long wave trough will have a cold front along the leading edge and is quite moist. The front will push inland Sunday afternoon, reaching it's most intense stage on Monday. Expecting post frontal showers through mid-week.

Ensemble models are showing good agreement in the general synoptic pattern, however there is still quite a bit of difference in the timing and intensity of the front. The GFS is trending on the slower side - not making landfall until Sunday afternoon - while the ECMWF is a bit quicker. There is also quite a bit of variability in the rainfall amounts with this system. Decided to stay close to the NBM outputs for the long term as it has produced a 'middle of the road' forecast. However, did increase rainfall amounts slightly on Monday to account for the slower onset provided by the GFS. -Muessle

AVIATION. Current satellite and surface observations show a mixture of MVFR/IFR cigs along the coast as well as widespread MVFR stratus across the Willamette Valley with pockets of IFR cigs. Conditions will slowly improve to widespread VFR by 18Z-20Z Thursday as high pressure builds across the region. These VFR conditions are expected to dominate through at least 18Z Friday.

Northerly winds will ramp up this afternoon with sites south of and including KSLE, along with coastal locations gusting up to 25 kt. Winds expected to remain north/northwesterly through the overnight hours, with gusts diminishing after 00Z-03Z Friday.

For detailed regional Pac NW aviation weather information, go online to: https://weather.gov/zse

KPDX AND APPROACHES . Current MVFR cigs expected to improve towards VFR starting around 17Z-19Z Thursday. VFR expected to dominate afterwards through 18Z Friday. Expect northerly winds to ramp up with gusts up to 15 kts in the afternoon, and remain north/northwesterly with the gusts diminishing after 00Z-03Z Friday. /42

MARINE. Thursday Morning Update: Observations are showing that the thermal low which has been building north from Central California is moving faster than previous guidance has suggested. As a result northerly gusts up to 25 kt and occasional 10ft seas are currently being observed at Buoy 46050. Therefore, have adjusted the current suite of Small Craft Advisories currently in effect for all zones. Also, given that the thermal low might be a bit stronger than originally though there is the chance for gusts up to 30 kt especially in the outer waters.

Expect this thermal low to continue to build northward through the morning hours and likely bringing Small Craft conditions to the northern zones by the late morning. Given that model guidance is having issues with timing of this system, will continue to closely monitor and adjust the forecast as needed.

Otherwise, observations this morning show seas around 7 to 9 ft, at 11 to 13 seconds with northerly winds between 15 to 20 kts.

There is the possibility that isolated gusts up to 35 kt in the outer waters this afternoon. Confidence is not high enough that wind gusts this strong will be widespread. However, it is a possibility, mariners should be cautious. Conditions are still expected to drop below Small Craft criteria Friday night into Saturday, with seas between 6 to 8 ft during this time.

A frontal system will push across the waters Saturday through Sunday, bringing a transition to southerly winds. Small Craft Advisory winds are likely to return Sunday with the potential for Gale conditions in zones PZZ275 and PZZ255. Seas will also build through this time period and build towards 10 to 12 ft or possibly higher by Monday afternoon as the westerly swell arrives. /42

PQR WATCHES/WARNINGS/ADVISORIES. OR . None. WA . None. PZ . Small Craft Advisory from 11 AM this morning to 2 AM PDT Friday for Waters from Cape Shoalwater WA to Cascade Head OR from 10 to 60 nm.

Small Craft Advisory from 11 AM this morning to 5 AM PDT Friday for Coastal waters from Cape Shoalwater WA to Cascade Head OR out 10 nm.

Small Craft Advisory until 5 AM PDT Friday for Waters from Cascade Head to Florence OR from 10 to 60 nm.

Small Craft Advisory until 2 AM PDT Friday for Coastal waters from Cascade Head to Florence OR out 10 nm.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 19 mi49 min 66°F1025.9 hPa
ASTO3 - 9439040 - Astoria, OR 25 mi49 min N 4.1 G 5.1 56°F 65°F1025.4 hPa
46243 - Clatsop Spit, OR - 162 44 mi41 min 57°F5 ft

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Southwest Washington Regional Airport, WA22 mi71 minN 010.00 miOvercast58°F54°F87%1026.7 hPa

Link to 5 minute data for KKLS

Wind History from KLS (wind in knots)
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Last 24hr3CalmCalmS5CalmNW54NW5CalmN5Calm333CalmCalmCalmNW4CalmCalmNW4NW3Calm4
1 day ago4NW4NW3NW5CalmCalmS3CalmCalmCalmCalmCalmCalmCalmNW3CalmCalmCalmCalmN3NE3CalmN3Calm
2 days agoCalmCalmW4NW7NW4NW63N3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN4NW8

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
Click for Map
Thu -- 04:01 AM PDT     7.21 feet High Tide
Thu -- 07:03 AM PDT     Sunrise
Thu -- 09:47 AM PDT     Moonset
Thu -- 10:35 AM PDT     0.55 feet Low Tide
Thu -- 04:07 PM PDT     7.81 feet High Tide
Thu -- 07:09 PM PDT     Sunset
Thu -- 08:34 PM PDT     Moonrise
Thu -- 11:08 PM PDT     0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.33.25.16.67.26.85.74.22.71.50.70.61.73.55.67.17.87.56.44.83.11.60.50

Tide / Current Tables for Settlers Point, Columbia River, Oregon
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Settlers Point
Click for Map
Thu -- 03:54 AM PDT     6.94 feet High Tide
Thu -- 07:03 AM PDT     Sunrise
Thu -- 09:47 AM PDT     Moonset
Thu -- 10:30 AM PDT     0.53 feet Low Tide
Thu -- 04:00 PM PDT     7.55 feet High Tide
Thu -- 07:09 PM PDT     Sunset
Thu -- 08:35 PM PDT     Moonrise
Thu -- 11:03 PM PDT     -0.08 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.43.25.16.56.96.55.43.92.51.30.60.71.83.65.677.57.164.42.81.40.3-0.1

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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