Tuesday, April7, 2020
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Marine Weather and Tides
St. Helens, 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 6:36AMSunset 7:48PM Tuesday April 7, 2020 1:54 PM PDT (20:54 UTC) Moonrise 6:33PMMoonset 5:54AM Illumination 100% Phase: Full Moon; Moon at 15 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- 229 Am Pdt Tue Apr 7 2020
In the main channel.. - general seas...2 to 4 ft through Wednesday. - first ebb...around 5 am Tuesday, with seas near 6 ft. - second ebb...strong ebb around 515 pm Tuesday, with seas near 7 ft. - third ebb...very strong around 545 am Wednesday, with seas near 6 ft.
PZZ200 229 Am Pdt Tue Apr 7 2020
Synopsis for the southern washington and northern oregon coast.. High pressure over the waters will persist through the week. A thermal trough strengthens along the north california coast Tue afternoon for periods of gusty north winds.


7 Day Forecast for Marine Location Near St. Helens, OR
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location: 45.87, -122.8     debug


Area Discussion for - Portland, OR
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FXUS66 KPQR 071624 AAA AFDPQR

Area Forecast Discussion . Updated National Weather Service Portland OR 923 AM PDT Tue Apr 7 2020

Aviation Discussion Updated

SYNOPSIS. High pressure will continue to strengthen over the Pacific Northwest through Wednesday. Strong onshore low-level flow will result in breezy to windy conditions in the Central Columbia River Gorge this afternoon. Light offshore flow develops Wednesday and continues through early Thursday. Wednesday and Thursday will be the warmest days of the week. A gradual cooling trend begins Friday as as the upper ridge weakens. There will be a chance for some shower activity Saturday and Sunday.

SHORT TERM. Today through Thursday . Water vapor satellite imagery continues to show a closed low spinning over the central California coast, with a weak shortwave disturbance moving across the interior Pacific Northwest. This has resulted in moderate onshore flow across the region this morning, with marine stratus along the coast starting to filter up the Lower Columbia River. In addition, some wrap-around moisture associated with the closed low over California is resulting in stratus across portions of the Oregon Cascades and Foothills, with stratus starting to fill into portions the interior lowlands. Expect stratus to continue to fill into the interior this morning and stick around through this afternoon so temps will be slightly cooler today. Guidance continues to show a KTTD-KDLS gradient around 4-5 mb this afternoon so expect breezy to windy conditions in the central Gorge with gusts 25 mph likely.

Guidance then shows onshore flow decreasing late tonight as high pressure strengthens over the region. Expect dry offshore flow to develop Wednesday morning with thermal low pressure expanding north along the Oregon coast. With mostly clear skies expected overnight and some lingering low level moisture cannot rule out some patchy frost developing Wednesday morning, but think the atmosphere will be too dry to support fog development. Expect sunny skies across the forecast area Wednesday afternoon with rising 850 mb temps. Guidance continues to show 850 mb temps around 9 C over SW Washington and near 11 C over Lane County. This will result in surface temps climbing to near 70 F over portions of the interior lowlands Wednesday afternoon. Guidance continues to show the thermal trough shifting to the inland valleys Wednesday night, then into the east slopes of the Cascades on Thursday. This will result in slightly cooler temps along portions of the coast Thursday as onshore flow returns, but areas east of the Coast Range will likely see little change or slightly warmer temps Thursday afternoon as sunny skies continue. /64/Weishaar

LONG TERM. No Changes Previous discussion follows. Thursday night through Monday . Models and their respective ensembles are in good agreement Thu night and Fri showing a flattening of the 500 mb ridge centered offshore. Expect a marine push or increasing onshore flow Thu night and Fri for dry, but cooler daytime conditions. The GFS ensembles suggest moderate to high forecast confidence. The ECMWF ensembles indicate a 40-50 dm drop in 500 mb heights from Thu afternoon to Fri. The 12Z operational ECMWF and GFS show a short-wave sliding south through eastern Washington and Oregon Sat. The operational ECMWF appears to be more aggressive with this feature and paints some light QPF across much of the forecast area Sat. 500-mb cluster analysis valid Sat with higher weighting for the GFS shows slightly higher 500 mb heights over the forecast area, compared to the higher-weighted ECMWF cluster. Have gone with some low-end POPS for Sat. This may turn out to be a deepening marine layer that produces some drizzle or very light rain.

By Sun models and ensembles show amplification of the eastern Pacific ridge. This result in north flow aloft. Left some token POPS Sat night through Sun morning and then went dry for Sun afternoon. The total mean 500 mb cluster analysis valid Sun indicates ridging close enough to the coastline and mean troughing well to the east for moderate confidence in a dry forecast. Weishaar

AVIATION. High pressure continues to build across the area keeping conditions calm and clear. MVFR cigs remain north of KTMK but are slowly lifting and should lift to VFR around 21Z Tuesday. Increasing northerly flow around 20Z Tuesday could bring some gustier conditions to the central Oregon coast. KAST could have some high MVFR/low VFR cigs between 2500 to 3500 ft redevelop around 10Z Wednesday. Otherwise, VFR conditions over the next 24 hours along with weak northerly winds.

PDX AND APPROACHES . VFR conditions over the next 24 hours. Winds will be generally light and from the north. /42

MARINE. A brief lull in conditions Tue morning before a thermal ridge builds in Tue afternoon. This thermal gradient will increase the northerly winds to small craft levels with gusts to 25 kt likely. Winds are expected to be the strongest in the central Oregon waters, but there is a chance that some isolated gusts to 25 kt could be observed in the northern Oregon/southern Washington waters west of 10 NM. At this time, due to marginal conditions, decided against a Small Craft Advisory for the northern waters. Elevated winds should persist through the next several days with the possibility for the small craft to be extended into mid-week.

Seas are fairly quiet with periods of square seas around 7 ft. The primary northwesterly swell will generally be around 5 ft with a 8 second period. In contrast a longer period wave is projected from the northwest. This second 2 ft 18 second swell will persist through mid-week. On Wed, winds begin to ramp up and the addition of a building wind wave will increase seas to near 9 ft with a 10 to 13 second period. -Muessle

PQR WATCHES/WARNINGS/ADVISORIES. OR . None. WA . None. PZ . Small Craft Advisory from 2 PM this afternoon to 7 AM PDT Wednesday for coastal waters from Cascade Head OR to Florence OR out 60 NM.



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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
LOPW1 - 9440422 - Longview, WA 18 mi54 min 1025.1 hPa (+0.4)
ASTO3 - 9439040 - Astoria, OR 56 mi54 min NW 1.9 G 5.1 50°F 49°F1024.8 hPa (+0.5)
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 63 mi54 min 49°F1025.2 hPa (+0.0)

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR8 mi61 minVar 510.00 miOvercast51°F39°F64%1024.4 hPa
Southwest Washington Regional Airport, WA18 mi58 minNW 310.00 miOvercast51°F37°F61%1025.7 hPa
Pearson Airfield, WA19 mi61 minWNW 910.00 miOvercast53°F37°F57%1024.2 hPa
Portland, Portland International Airport, OR21 mi61 minNW 810.00 miMostly Cloudy53°F37°F57%1024.3 hPa
Portland-Hillsboro Airport, OR24 mi61 minNW 1010.00 miPartly Cloudy54°F39°F59%1024 hPa

Link to 5 minute data for KSPB

Wind History from SPB (wind in knots)
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Last 24hrE43S5SE4SE5CalmNW7N7NW7N8N5NW5N10
G20
N5N7N7N4CalmCalmCalmNW5N5NW55
1 day agoNE43--N3NW4N7NW4CalmW4NW3CalmCalmN6CalmW3SW3NW3CalmCalmCalm4NE43Calm
2 days agoS7SE7E5W3CalmCalmCalmNW3NW3W3W3CalmW4NW3NW3CalmW4W3CalmNW4N5NW44Calm

Tide / Current Tables for Saint Helens, Oregon - IGNORE HEIGHTS
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Kalama, Washington - IGNORE HEIGHTS
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Portland, OR (16,3,4,5)
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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.