Friday, July3, 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 5:24AMSunset 9:05PM Friday July 3, 2020 8:35 PM PDT (03:35 UTC) Moonrise 7:04PMMoonset 2:59AM Illumination 98% Phase: Waxing Gibbous; Moon at 13 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- 227 Pm Pdt Fri Jul 3 2020
In the main channel.. - general seas...generally 2 to 3 ft through Saturday. - first ebb...around 430 pm this afternoon. Seas to 4 ft. - second ebb...very strong ebb around 445 am Saturday. Seas to 5 ft with breakers possible. - third ebb...around 515 pm Saturday. Seas to 4 ft.
PZZ200 227 Pm Pdt Fri Jul 3 2020
Synopsis for the southern washington and northern oregon coast.. Weak low pressure will remain centered near vancouver island through Saturday and then dissipate Saturday night and Sunday. High pressure continues off the south oregon and north california coast for the next few days. Expect generally benign wind conditions through early next week.


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 032110 AFDPQR

Area Forecast Discussion National Weather Service Portland OR 210 PM PDT Fri Jul 3 2020

SYNOPSIS. Dry weather with seasonable temperatures continues through the weekend as an upper level trough of low pressure over the Pacific Northwest weakens. The trough deepens slightly again early next week returning a small chance for showers to parts of the region.

SHORT TERM. Tonight through Monday . The overall pattern will remain fairly consistent over the holiday weekend with typical Pacific Northwest weather expected through Monday. Water vapor imagery shows the the upper level trough extended across western Canada oriented southwest offshore, which has brought a few light showers to the southwest Washington coast. Expect these showers to diminish as the upper trough moves onshore tonight. With weak onshore flow in the low levels and residual low level moisture, much of the forecast areas in the valley and along the coast will see morning clouds with afternoon sun Saturday and Sunday. The marine air mass will also likely keep temperatures only a few degrees below July normal maximums, with valley high temperatures reaching the mid to upper 70s, while coastal regions will likely reach the mid-60s.

Another weak upper trough will likely swing toward the Pacific Northwest coast Monday. This may bring a few more light showers to the coast, while the valley locations should remain dry with some marine layer clouds lingering through the morning hours and temperatures moderating near the mid-70s again. DDH

LONG TERM. Monday night through Friday . The overall general pattern will remain quite similar as a broad upper level trough is expected to remain over the Pacific Northwest through next week. Model details differ somewhat as to how deep the trough will get and which days have the better chance of rain showers. Currently the National Blend of Models suggests the best chance of showers will be Tuesday, especially north of Salem and along the mountains, with diminishing chances Wednesday and Thursday. The GFS model though wants to deepen the upper low midweek off the Pacific NW coast with increasing chances of precip Wed and Thur, while the European model and most ensembles are not quite in agreement, leaving the GFS as a bit of an outlier.

Low level onshore flow will likely continue into the end of the week. The marine air mass should continue to keep daytime highs trending slightly cooler than normal, before possibly warming to near normal by the end of the week if any hint of ridging comes to fruition. Otherwise expect the continuation of the pattern with areas of morning clouds spreading in over the interior, followed by decreasing clouds in the afternoon. DDH

AVIATION. Marine layer continuing to erode early this afternoon. At 21Z areas of MVFR cigs persisted just east of KSLE to K61S. Low-end VFR cigs were noted along the south Washington and north Oregon coast and the associated coastal valleys. Expect prevailing VFR across the area by 23Z, but BKN sky conditions likely to persist in SW Washington and the north Oregon coast and Coast Range through at least Sat morning. Elsewhere, the marine layer fills in overnight, with areas of MVFR. Model guidance suggests marine layer dissipation timing Sat afternoon will be similar to today.

KPDX AND APPROACHES . VFR cigs 035-045 at the terminal and vicinity early this afternoon. SCT sky cover develops between by 00Z Sat. BKN-OVC conditions return by 10Z Sat, with MVFR possible late tonight through Sat morning. Weishaar

MARINE. Overall benign marine conditions for the next several days. A weak low off Vancouver Island and surface high pressure off the south Oregon and north California coast will be the dominant features over the waters. Wind speeds 10 kt or lower will persist through at least the middle of next week.

Wave heights this afternoon were around 5 ft. All model guidance show wave heights in the 3 to 5 ft range for the next several days. Models continue to show a low-amplitude long-period south swell through early next week. Long period swell, such as the 16 to 18 second south swell expected this weekend, usually raises concern regarding sneaker waves. However, current guidance indicates rather low wave heights associated with the long-period swell mixed with a 2-3 ft shorter period west to northwest swell. This produces combined wave heights 4 to 5 ft. Weishaar



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 18 mi47 min 63°F1019.9 hPa
ASTO3 - 9439040 - Astoria, OR 56 mi47 min 61°F 64°F1020.6 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 63 mi47 min 56°F1021.4 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR8 mi42 minN 610.00 miFair66°F50°F56%1019 hPa
Southwest Washington Regional Airport, WA18 mi39 minWNW 510.00 miFair63°F52°F68%1020.4 hPa
Pearson Airfield, WA19 mi42 minNNW 410.00 miFair67°F48°F53%1019.1 hPa
Portland, Portland International Airport, OR21 mi42 minN 810.00 miMostly Cloudy67°F50°F55%1019.1 hPa
Portland-Hillsboro Airport, OR24 mi42 minNE 710.00 miA Few Clouds66°F52°F61%1019 hPa

Link to 5 minute data for KSPB

Wind History from SPB (wind in knots)
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Last 24hrN5N6N7N5N5N3CalmCalmCalmCalmN3NW4E4CalmCalm33Calm3N6N8N8N10N6
1 day agoW7NW5CalmNW4W3CalmCalmCalmSW3CalmCalmCalmCalmSE3SE4SE4Calm3E4E4CalmNE3N7N7
2 days agoNW3NW33W4CalmSW6SW7W634SE3CalmSW8SW43NW5Calm56W5SW6NW5
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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 (23,6,7,8)
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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 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.