Sunday, August25, 2019

Marine Weather and Tides
St. Helens, OR

Version 3.4
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at Allen

Sunrise 6:20AMSunset 8:05PM Saturday August 24, 2019 10:45 PM PDT (05:45 UTC) Moonrise 11:53PMMoonset 2:34PM Illumination 28% Phase: Waning Crescent; Moon at 24 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- 211 Pm Pdt Sat Aug 24 2019
In the main channel.. - general seas...2 to 4 ft Saturday, building to 3 to 5 ft Sunday. - first ebb...around 1230 am Sunday morning. Seas temporarily building to 5 ft. - second ebb...around 1 pm Sunday afternoon. Seas temporarily building to 6 ft. - third ebb...around 1245 am Monday. Seas temporarily building to 7 ft.
PZZ200 211 Pm Pdt Sat Aug 24 2019
Synopsis for the southern washington and northern oregon coast.. High pressure will strengthen over the ne pacific Sunday and Monday, while thermal low pressure builds northward along the northern ca and southern or coast. Thermal low pressure is expected to continue building northward into western oregon Tuesday and Wednesday.

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 250341 aaa
area forecast discussion... Updated
national service portland or
841 pm pdt Sat aug 24 2019
updated aviation section.

Synopsis Another weak upper level disturbance will slide by
to the north of the area late tonight and early Sunday, bringing
seasonable temperatures to the region. High pressure aloft begins to
rebuild and strengthen late Sunday and through early next week over
the pacific northwest, with above normal temperatures across the
region expected.

Short term Saturday through Monday... A westerly flow aloft
Saturday afternoon is expected to continue into Sunday. A weak
shortwave, following on the heels of todays, is expected to cross
washington early Sunday. A weak front with todays system has left a
band of clouds in the low to mid level moisture across the NW part f
the forecast area Saturday afternoon. Klgx radar and surface
observations showed isolated weak showers over southwest washington
and the far north part of the oregon coast range. Will keep a low
pop this evening for the south washington cascades as the remains of
the front continue to push inland. With a continuation of low level
onshore enhanced by a weak shortwave in the north, expect to see
shallow marine clouds redevelop overnight along the southern part of
the coast, and push locally inland up the lower columbia late
tonight and early Sunday. With the modest reinforcement of marine
air overnight, expect temperatures Sunday similar to Saturdays

Sunday night through Tuesday models agree on the upper flow turning
northwest as an upper ridge builds offshore and eventually shifts
inland as a negative tilt ridge. A thermal induced surface trough is
expected to build up the coast Sunday night and Monday in response
to the upper level ridging, turning the low level flow more
northerly with time. This will reduce considerably any prospects for
a return of marine clouds Sunday night and Monday night. Warming
temperatures in this pattern will see temperatures climbing Monday
and Tuesday, with 850 mb temperatures reaching 22c by 00z,
suggesting highs well into the 90s by Tuesday afternoon despite a
bit of a mid level subsidence inversion suggested in the model
soundings limiting temperatures to something a little less than what
might otherwise be expected for the 850 mb temperatures with an
offshore flow.

Long term Tuesday night through Saturday... A negatively tilted
high pressure ridge continues to build over the west coast through
Wednesday. As the ridge builds on Wednesday, skies are expected to
be clear which will raise temperatures into the 90s. On Thursday,
conditions begin to shift as a shortwave trough moves through the
flow around the ridge. As this shortwave advances towards the west
coast, models begin to diverge which impacts confidence on Thursday
and Friday. The ECMWF brings the shortwave inland farther and faster
on Thursday, while the GFS keeps a majority of the energy off shore
of the northern oregon coast. However, with either solution this
pattern is generally favorable for convective activity, so a slight
chance of thunderstorms and showers are forecast on Thursday
afternoon along the cascade crest. On Friday night into Saturday, a
front along the leading edge of an alaskan low will approach the
west coast which may bring a chance of showers to the coast.

Aviation MainlyVFR across the forecast area as of 0330z,
though MVFR stratus is beginning to develop near the coast north
of cannon beach. Expect low clouds to fill in near the coast
overnight, along with some patchy fog in the coastal valleys.

Some MVFR stratus with CIGS 015-025 msl will likely push inland
into the pdx metro terminals by sunrise Sunday, but chances of
this are lower the further south one GOES in the willamette
valley.VFR conditions will return inland by 19z, though some
MVFR may linger near the north coast into the afternoon. North
winds will become rather brisk along the central or coast Sunday
afternoon with gusts 25-30 kt possible konp southward.

Kpdx and approaches...VFR through this evening, then there is a good
chance for seeing MVFR ceilings with marine clouds spreading
into the area after 11z Sunday morning. Weagle bowen

Marine High pressure will reassert itself over the ne
pacific Sunday, causing n-nw winds to increase across our
coastal waters by afternoon. Winds above 20 kt are likely to
continue uninterrupted through the first part of next week as
both the high pressure system over the NE pacific and a thermal
trough over SW oregon intensify. Increasing wind wave component
will result in increasingly choppy seas Sunday and Monday.

The thermal trough over southern oregon is modeled to build
northward into the north oregon waters toward the middle of next
week. This may push the stronger winds further offshore Wednesday,
while lighter offshore flow prevails for the coastal waters.


Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory from noon to 11 pm pdt Sunday for coastal
waters from cascade head or to florence or out 60 nm.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 18 mi46 min 71°F1017.6 hPa (+0.9)
ASTO3 - 9439040 - Astoria, OR 56 mi46 min NW 6 G 7 64°F 69°F1018 hPa (+0.7)
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 63 mi52 min 55°F1018.2 hPa

Wind History for Longview, WA
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR8 mi3.9 hrsNNW 710.00 miFair73°F57°F59%1015.6 hPa
Southwest Washington Regional Airport, WA18 mi3.8 hrsWNW 610.00 miMostly Cloudy70°F59°F68%1017.3 hPa
Pearson Airfield, WA19 mi3.9 hrsNW 11 G 1610.00 miFair74°F57°F56%1015.5 hPa
Portland, Portland International Airport, OR21 mi3.9 hrsNNW 8 G 1510.00 miA Few Clouds75°F57°F55%1015.3 hPa
Portland-Hillsboro Airport, OR24 mi3.9 hrsNW 1310.00 miA Few Clouds73°F55°F55%1015.5 hPa

Link to 5 minute data for KSPB

Wind History from SPB (wind in knots)
Last 24hr--N3NW5N4N4N4N6CalmCalmN3CalmCalmSE5SE64SE5NW5N6N8N9N7----NW7
1 day ago--N5--CalmCalmN3Calm--NW3N3N4NE66N7N9N9N10
2 days ago--3N7--N5CalmW3SW3Calm--CalmCalmN5NW6N55NE8NE13

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 and Satellite Images
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GOES 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 (1,6,7,8)
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Ground Weather Radar Station Portland, OR
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weather_mapweather_map weather_map

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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 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 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.