Monday, March18, 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 7:15AMSunset 7:21PM Monday March 18, 2019 7:27 PM PDT (02:27 UTC) Moonrise 3:33PMMoonset 5:19AM Illumination 96% 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- 251 Pm Pdt Mon Mar 18 2019
.small craft advisory for rough columbia river bar in effect until 5 pm pdt this afternoon...
.small craft advisory for rough columbia river bar in effect from Tuesday afternoon through Tuesday evening...
In the main channel.. - general seas...around 5 to 6 feet Monday night and 7 feet Tuesday and Tuesday evening. - first ebb...strong ebb around 345 pm Monday. Seas building to 10 feet with breakers possible. - second ebb...around 415 am Tuesday. Seas building to 9 feet. - third ebb...very strong ebb around 430 pm Tuesday. SEa building to 12 ft.
PZZ200 251 Pm Pdt Mon Mar 18 2019
Synopsis for the southern washington and northern oregon coast.. High pres remains inland over the pac nw. The dissipating front will push into the region Wed, a stronger front moves to the waters Fri.


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 182208
afdpqr
area forecast discussion
national weather service portland or
308 pm pdt Mon mar 18 2019

Synopsis Dry weather will continue through Tuesday, along with
unseasonably warm temperatures and a breezy offshore flow. A low
passing by to the south brings a small chance for rain mainly to the
southern part of the forecast area Wednesday. Chances for rain
increase through the end of the week as a more progressive weather
pattern returns.

Short term Tonight through Thursday... Models show the upper
ridge over the pacific northwest Monday to shift slowly east through
the middle of the week. A moderately strong pressure gradient east
to west across the forecast area Monday afternoon is expected to
shift more towards the gorge by Tuesday afternoon. This will allow
the east winds to subside some tonight and Tuesday across much of
the forecast area, except in and near the gorge where windy
conditions will continue. The ridge and offshore flow will keep
skies clear through tonight, before some high clouds start moving up
in an increasing southerly flow aloft on the backside of the upper
ridge Tuesday. Temperatures will also remain well above normal
through Tuesday.

Tuesday night and Wednesday models have been consistent on showing
an incoming upper trough splitting as nears the coast, with a cutoff
low heading into central california. Time height cross sections
indicate moisture remains mostly in the upper levels above 10k ft
Tuesday night and Wednesday. Coupled with weak lift, this will limit
chances for any rain to low pops across the southern part of the
forecast area Wednesday. Temperatures will remain mild without a
chance in the air mass, although clouds will tend to hold high
temperatures down some Wednesday, particularly in the south.

Wednesday night and Thursday a weak upper trough trailing the upper
low reaches the forecast area. This will bring an increase in low
level moisture as the offshore flow from earlier in the week finally
comes to an end. While the dynamics and moisture profiles are
something less than impressive, will include a slight chance for
showers to much of the forecast area as the trough moves through.

Long term Thursday night through Monday... Once the Thursday
evening shortwave trough moves through, there is a brief break in
the action before another trough and pacific cold front approach in
the afternoon Friday. There is some suggestion in the models for
this shortwave to also split as it approaches the coast and moves
away from the parent longwave trough out near 150w. Still, this one
looks a little more promising for precipitation chances as a cold
front accompanies the short wave Friday night and the upper ridge by
then has shifted east across the rockies. Decreasing showers follow
Saturday on the backside of the torugh, then Sunday looks
potentially dry as a shortwave ridge moves across. Timing in the
models at this point becomes more questionable, but it appears
another chance for rain comes as early as Monday as a progressive
pattern continues.

Aviation Vfr conditions will continue across northwest oregon
over the next 24 hours. East pressure gradients weaken slightly
overnight but increase again Tuesday afternoon. Expect gusty
east winds in and near the western columbia river gorge, across
the coast range and downwind of coast range passes along the
coast. Winds will diminish slightly overnight but increase again
Tuesday. Pressure gradients finally relax some Wednesday night.

Kpdx and approaches...VFR conditions continue through the next 24
hours. East wind increasing to 15 to 25 kt with gusts to 35 kt.

Decreasing a bit over night then increasing Tuesday. Higher
gusts to 40 kt in eastern approaches near the gorge. Schneider

Marine high pressure continues east of the cascades with a
trough along the coast. Gusty east winds continue in the northern
waters especially below the coastal gaps. Small craft advisory
for the waters north of cascade head will continue through
Tuesday morning. It is possible winds will continue Tuesday
afternoon but models show some weakening of the gradient over the
waters and the coast so winds should diminish a little Tuesday
afternoon. Wednesday a dissipating system approaches from the
southwest. As a result may see a flow reversal reaching the
central coast Tuesday Wednesday timeframe. This will likely bring
low stratus or fog with it. A stronger front is currently timed
affect the waters Friday with south winds in the 15 to 25 kt
range.

Seas have settled to 6 to 7 ft over the waters. Seas remain
below 10 feet through Friday. However a longer period swell is
forecast to arrive by Tuesday afternoon. With the strong and very
strong ebb current occurring this will push the columbia river
bar above small craft criteria. Thursday a long period swell near
20 seconds reaches the waters, but the period decreases quickly
as the swell builds above 5 ft. Current enp and ECMWF wave models
show the swell building 13 to 15 feet on Saturday. Schneider

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory for winds until 11 am pdt Tuesday for
coastal waters from CAPE shoalwater wa to cascade head or
out 60 nm.

Small craft advisory for rough columbia river bar until 5 pm
pdt this afternoon.

Small craft advisory for rough columbia river bar from 3 pm to
9 pm pdt Tuesday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 18 mi40 min 44°F1017.2 hPa
ASTO3 - 9439040 - Astoria, OR 56 mi40 min SW 6 G 11 66°F 44°F1014.6 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 63 mi40 min 53°F1014.9 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR8 mi35 minE 610.00 miFair64°F32°F30%1018.3 hPa
Southwest Washington Regional Airport, WA18 mi32 minESE 10 G 1810.00 miFair68°F28°F22%1018.1 hPa
Pearson Airfield, WA19 mi35 minE 17 G 2510.00 miFair62°F28°F29%1017.8 hPa
Portland, Portland International Airport, OR21 mi35 minE 21 G 2610.00 miFair and Breezy61°F30°F32%1017.8 hPa
Portland-Hillsboro Airport, OR24 mi35 minE 16 G 2210.00 miFair62°F30°F30%1017.5 hPa

Wind History from SPB (wind in knots)
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Last 24hr3SW5W4NW3W3W3W3W4W5CalmCalmN3W4W4S5CalmSE4SE6E13E15E15
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1 day agoW3W3CalmW3CalmCalmW3W3W3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSE3NE9E8
2 days agoW4W4W3W3CalmCalmW3CalmCalmCalmCalmW3CalmCalmCalmSE3SW3CalmCalmCalmCalmSE4CalmCalm

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 (22,6,7,8)
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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.