Monday, May20, 2019 L-36.com


Marine Weather and Tides
St. Helens, OR

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:32AMSunset 8:42PM Monday May 20, 2019 8:43 AM PDT (15:43 UTC) Moonrise 9:50PMMoonset 6:06AM Illumination 97% Phase: Waning Gibbous; Moon at 16 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- 318 Am Pdt Mon May 20 2019
.small craft advisory for rough columbia river bar in effect until 9 am pdt this morning...
In the main channel.. - general seas...around 5 to 6 ft through Monday night. - first ebb...very strong ebb around 630 am Monday. Seas building to 10 feet with breakers possible. - second ebb...around 7 pm Monday. Seas building to 7 ft. - third ebb...strong ebb around 7 am Tuesday. Seas building to around 8 feet with breakers possible.
PZZ200 318 Am Pdt Mon May 20 2019
Synopsis for the southern washington and northern oregon coast.. An area of high pressure remains this morning over the coastal waters. A southeast moving low pressure system will approach the region Monday afternoon, then reach the south oregon coast by Tuesday morning. High pressure returns to the north pacific for the second half of the 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 200957
afdpqr
area forecast discussion
national weather service portland or
254 am pdt Mon may 20 2019

Synopsis Mostly dry across region today, but showers will be
increasing later in the afternoon as yet another low pressure area
approaches from the west. Showery weather continues into tue. Then,
appears will see lesser chances of showers for the lowlands, as
showers become more diurnally driven and focused over the higher
terrain. Models having some difficulty for next sat, as some indicate
cool and rainy weather, while others suggest mild and mostly dry. So,
keep ear out for updates as this week progresses.

Short term Today through Wednesday... Mostly dry across region this
am, though still have scattered showers over the cascades. These
mostly drifting westward on the easterly winds aloft, thanks the the
upper low that that sits over the great basin. Overall, this current
pattern will continue this am, with showers over the cascades and
foothills gradually decreasing.

But, another upper low is approaching from the west, and will see its
affects starting this afternoon. Generally, will see increasing
clouds this afternoon. Like the system that passed by on Sunday, this
low will pass to our south, and move across southwest oregon and then
into northern calif late tonight into tue. Showers will develop along
the coast and coastal mountains by mid afternoon, with then spread
inland through rest of the afternoon. Upper flow gradually becoming
southerly again this afternoon, which will support divergence aloft
and enhance shower potential. But, flow alignment and mid level
moisture suggest heavier showers will stay south of a newport to mt
salem to mt jefferson line. While not out of the question,
instability may just be enough to pop an isolated thunderstorm or two
across lane county later this afternoon into the evening. For now,
will leave out of forecast, but bears watching.

With the low passing to the south of the region, showers will
gradually decrease Tue night from north to south. By later tue
evening, only chances for showers will be over the oregon cascades,
mainly south of santiam pass. At same time, onshore flow riding
northwesterly winds will increase later Tue and Tue night. This will
provide a rather deep marine layer over the region at that time.

After morning clouds, will see partly cloudy skies on wed. But, still
a tad cool, but at least closer to what would expect for mid may:
lower 60s on coast, and upper 60s inland. rockey.

Long term Wednesday night through Sunday... Models agree on the
general pattern going into next weekend, with a large upper-level
ridge building up just off the west coast. This general trend
should help to dry us out going into next weekend, but some
uncertainty in the exact position of the ridge could introduce a few
showers, especially over the cascades as shortwaves ride down along
the eastern side of this ridge. For this reason, have left a slight
chance of showers over the cascades through at least Saturday.

Models show the ridge trying to nose a bit farther east on Sunday,
which will help temperatures climb again, possibly to around 80
degrees in the north willamette valley, lower columbia i-5 corridor,
and hood river valley. This should also shut down any chance for
showers over the cascades by Sunday. -mccoy

Aviation MostlyVFR conditions for inland locations through
the morning. Areas along the coast will experience MVFR cigs
through the morning. Expect patchy lower clouds, generally
around 2000-2500 ft through 17z. Around 17z-20z Monday clouds
lifting to generallyVFR conditions. Gusty south winds will
develop along the coastal areas by 18z and south to southeast
winds across the interior closer to 21z ahead of an approaching
front.

Kpdx and approaches...VFR conditions with CIGS gradually
lowering to MVFR conditions around 12z. MVFR CIGS expected to
linger through 17z. Then lift toVFR conditions after 17z Monday
with light southerly surface winds. 42

Marine High pressure remains this morning over the coastal waters
for a period of relatively quiet marine weather. However, a
southeast moving low pressure system will approach and enter the
waters this afternoon and evening. Expect stronger south winds
to develop across the waters ahead of the low, with small craft
advisory strength winds developing as well across the waters.

A gale warning for the outer central oregon waters is out as
winds are expected to gust up to 35 kt. After the gale warning has
expired, small craft advisory winds are expected to persist.

As the winds increase, seas will build, reaching around 8 to 10
ft tonight with a dominate period of 8 to 9 seconds. As a
result have also added a small craft advisory for hazardous
seas. A modest fresh westerly swell follows the system Tuesday,
and is expected to push seas into the range of 11 to 13 ft.

Later in the week, expect high pressure to again build offshore
with a return of gusty northerly winds across the coastal waters
and the potential return of small craft advisory winds. 42

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory for winds from 11 am this morning to 2 am
pdt Tuesday for coastal waters from CAPE shoalwater wa to
florence or out 10 nm.Waters from CAPE shoalwater wa to
cascade head or from 10 to 60 nm.

Small craft advisory for hazardous seas from 5 pm this
afternoon to 2 am pdt Tuesday for coastal waters from cape
shoalwater wa to florence or out 10 nm.Waters from cape
shoalwater wa to cascade head or from 10 to 60 nm.

Small craft advisory for winds from 11 am this morning to 5 pm
pdt this afternoon for waters from cascade head to
florence or from 10 to 60 nm.

Gale warning from 5 pm this afternoon to 11 pm pdt this evening
for waters from cascade head to florence or from 10 to 60
nm.

Small craft advisory for rough columbia river bar until 9 am
pdt this morning.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 18 mi49 min 57°F1010.1 hPa
ASTO3 - 9439040 - Astoria, OR 56 mi43 min SSW 5.1 G 8 53°F 58°F1009.4 hPa (+0.4)
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 63 mi49 min 57°F1010.8 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR8 mi50 minN 010.00 miOvercast55°F48°F80%1009.9 hPa
Southwest Washington Regional Airport, WA18 mi47 minSSE 410.00 miOvercast54°F50°F87%1010.8 hPa
Pearson Airfield, WA19 mi50 minSE 310.00 miOvercast54°F46°F77%1010.3 hPa
Portland, Portland International Airport, OR21 mi50 minS 610.00 miOvercast54°F46°F77%1010.4 hPa
Portland-Hillsboro Airport, OR24 mi50 minN 010.00 miOvercast51°F46°F86%1010.3 hPa

Wind History from SPB (wind in knots)
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Last 24hrS3CalmE3NW45W6NW4NW5W65NW9NW5NW5NW3NW6NW5N4N4W3CalmCalmCalmCalmCalm
1 day agoCalmCalmN334NE4NE5N9E5CalmSW15
G27
E5NW4W4NW3W4CalmCalmNW3CalmCalmS4S3Calm
2 days agoSW8SW8W7SW7SW10S7S6SW10SW6SW10SW7SW5S3CalmCalmCalmCalmCalmCalmE6E3N3W3Calm

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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wmap_P
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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Portland, OR (11,2,3,4)
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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 numerious 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.