Wednesday, February20, 2019 L-36.com


Marine Weather and Tides
Scappoose, 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 7:03AMSunset 5:46PM Wednesday February 20, 2019 3:26 PM PST (23:26 UTC) Moonrise 7:24PMMoonset 8:02AM Illumination 98% 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- 224 Pm Pst Wed Feb 20 2019
.small craft advisory for rough columbia river bar in effect until 8 pm pst this evening...
.small craft advisory for rough columbia river bar in effect from late tonight through Thursday morning...
In the main channel.. - general seas...9 ft tonight and Thursday. - first ebb...very strong ebb around 530 pm this evening. Seas building to 12 feet with breakers likely. - second ebb...strong ebb around 6 am Thursday. Seas building to 13 feet with breakers likely. - third ebb...very strong ebb around 615 pm Thursday. Seas building to 13 feet with breakers likely.
PZZ200 224 Pm Pst Wed Feb 20 2019
Synopsis for the southern washington and northern oregon coast.. High pressure remains offshore over the ne pac this week, but a weak low will continue to move down the coast tonight. Another frontal system will move down the coast Fri and Fri night, followed by a weak low Sat night and Sun.


7 Day Forecast for Marine Location Near Scappoose, OR
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location: 45.7, -122.87     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 202211
afdpqr
area forecast discussion
national weather service portland or
209 pm pst Wed feb 20 2019

Synopsis An upper level trough will continue to drift south toward
the great basin tonight and Thursday. High pressure spreads over the
pacific northwest Thursday. The next weather system from the gulf of
alaska reaches the forecast area Friday. Snow levels Friday morning
will be near the valley floors, then rise in the afternoon. Continued
cool and unsettled conditions persist through the weekend into early
next week.

Short term Tonight through Saturday... Krtx dual pol doppler radar
at 21z showed shower activity across much of the area. There have
been several reports of graupel with the heavier showers and even a
couple thunder claps between gresham and camas earlier this
afternoon. This activity will continue into the evening. The kttd
profiler indicated snow levels around 1500 feet. The klgx doppler
radar showed scattered showers over the south washington and north
oregon coastal waters and SW washington interior. The large scale
pattern continues to show an amplifed 500 mb ridge axis along 145w
extending into alaska, driving cool north flow into the pac nw. This
pattern shows no sign of change through the weekend.

Allowed the winter weather advisory for the south washington cascade
foothills to end as shower coverage is decreasing and additional
impacts are likely to be very minimal. 12z model suite in good
agreement showing the 500 mb trough sinking into the great basin
tonight. The winter weather advisory for the south washington
cascades will end 00z thu. Will extend the winter weather advisory
until 03z for the north and central oregon cascades and foothills.

High pressure spreads into the area from the north tonight, which
will result in decreasing shower activity. North to northeast flow
aloft will help to maintain a relatively cold air mass over the area
tonight. Gradual clearing combined with this colder airmass will
result in widespread temperatures below freezing. Weak winds and
lingering surface moisture will help to promote areas of freezing fog
late tonight into early Thursday.

The dry weather pattern holds Thursday and Thursday night as the
transitory upper ridge moves over the pacific nw. Fog should clear by
late morning in most places, but light north wind through the
willamette valley may result in later clearing of low clouds and fog
in the south willamette valley.

The upper ridge shifts southeast Thu night ahead of the next incoming
gulf of alaska weather system. The hires arw and NAM nest show some
light QPF reaching the S washington and far N oregon coast 12z fri.

The 12z NAM also indicates precip into the SW washington interior and
far N oregon coast range between 15z and 18z fri. Model 850 mb temps
12z Fri are forecast to be around -5 to -6c, but wet-bulb zero
heights are expected to be below 1000 ft msl. The snow levels fri
morning will be around 500 ft. However, if precip arrives a little
sooner than expected, snow could fall to the valley floors. The 12z
wrf-gfs does not indicate any snow accumulation for the interior
valleys Fri morning. However, would not be surprised if a local
dusting occurred, especially above 500 feet. Any valley floor
snowfall looks to be minimal with little to no impact. Increasing
onshore low-level flow Fri and Fri evening will raise snow levels.

Saturday, the flow aloft becomes more maritime, but the overall air
mass remains cold for this time of year. Model 1000-500 mb thickness
values Sat remain in the mid to upper 520s, with 850 mb temps
hovering around -5c. Thus, snow levels 1000 to 1500 feet will
continue. Weishaar

Long term Saturday night through Wednesday... The 12z GFS and euro
agree a weak low will bring precipitation to the forecast area
Monday night into Tuesday. The euro shows slight ridging Sunday
night but that is quickly pushed out by the low that stays off the
oregon coast. Both models show a weakening of on-shore flow as
slight ridging Monday night starts to form, this will reduce
precipitation for a brief time. Although the 500mb regime is
predominantly ridge-like from Tuesday to Wednesday, perturbations
within the flow will keep pockets of precipitation within the area
through the extended.

Snow levels will progressively drop Sunday through Tuesday which
will bring snow into the cascades and northern coast range. Monday
night into Tuesday may bring snow to the low elevations in the
northern portion of the forecast area and possibly a rain-snow mix
in the portland-metro area however high temperatures will stay in
the mid-40s which won't allow for any sticking to occur.

Aviation Showers, with locally MVFR conditions, will diminish
this evening, leaving primarilyVFR conditions after 04z. MainlyVFR
conditions expected overnight and into Thursday, but there is a
chance for patchy ifr conditions in fog at low elevations mainly
between 10z and 17z.

Kpdx and approaches... PrimarilyVFR conditions expected tonight and
Thursday. Showers through 03z this evening bring a chance for brief
MVFR conditions, then there is a chance for low clouds or fog late
tonight and early Thursday mainly between 12z and 17z.

Marine Northwest winds gusting to 25 kt mainly over the
southern and outer waters this evening will gradualy decrease
tonight into Thursday morning, with winds over the southern outer
water the slowest to diminish. Winds turn to the northeast late
tonight, and continue northeast through Thursday. Another frontal
system dropping down from the north Friday turns winds back to the
west. This system appears to be a little weaker than the previous
system, but is still likely to bring small craft wind gusts
Friday afternoon an evening.

Seas peaking from 13 to 15 feet this evening. Seas then gradually
subsiding late tonight and Thursday, eventually dropping below 10
feet Thursday night. Seas are likely to build up to about 10
feet again Saturday.

Pqr watches warnings advisories
Or... Winter weather advisory until 7 pm pst this evening for cascade
foothills in lane county-cascades in lane county-northern
oregon cascade foothills-northern oregon cascades.

Wa... Winter weather advisory until 4 pm pst this afternoon for south
washington cascades.

Pz... Small craft advisory until 6 pm pst this evening for coastal
waters from CAPE shoalwater wa to florence or out 10 nm.

Small craft advisory for hazardous seas from 6 pm this evening
to 10 pm pst Thursday for coastal waters from cape
shoalwater wa to florence or out 10 nm.

Small craft advisory until midnight pst tonight for waters from
cape shoalwater wa to cascade head or from 10 to 60 nm.

Small craft advisory for hazardous seas from midnight tonight
to 10 pm pst Thursday for waters from CAPE shoalwater wa
to cascade head or from 10 to 60 nm.

Small craft advisory until 10 am pst Thursday for waters from
cascade head to florence or from 10 to 60 nm.

Small craft advisory for hazardous seas from 4 am to 10 pm pst
Thursday for waters from cascade head to florence or from
10 to 60 nm.

Small craft advisory for rough columbia river bar until 8 pm
pst this evening.

Small craft advisory for rough columbia river bar from 3 am to
8 am pst Thursday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 28 mi57 min 40°F1009.6 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 56 mi57 min 50°F1010.5 hPa
ASTO3 - 9439040 - Astoria, OR 59 mi57 min W 7 G 8.9 43°F 41°F1009.4 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR5 mi34 minSW 510.00 miPartly Cloudy46°F35°F66%1009.3 hPa
Portland-Hillsboro Airport, OR12 mi34 minS 410.00 miOvercast44°F37°F79%1009.3 hPa
Pearson Airfield, WA12 mi34 minESE 510.00 miA Few Clouds43°F37°F80%1009.5 hPa
Portland, Portland International Airport, OR16 mi34 minESE 910.00 miMostly Cloudy43°F37°F82%1009.6 hPa

Wind History from SPB (wind in knots)
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Last 24hrS7S3S3SE4SW3SW4CalmSW3CalmCalmSE4CalmCalmCalm5W4CalmN3CalmW7NW66W3SW5
1 day agoE4N3CalmCalmCalmCalmCalmN3NW3CalmCalmNW3CalmCalmCalmCalmCalmSE3S4S5CalmSW5S4SW5
2 days agoN4N5W3W3CalmCalmCalmW3W3CalmCalmCalmNW3CalmCalmN3CalmCalmCalmE4CalmCalmS3SE5

Tide / Current Tables for Vancouver, Columbia River, Washington (dubious accuracy)
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Vancouver
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Wed -- 03:00 AM PST     -0.37 feet Low Tide
Wed -- 07:05 AM PST     Sunrise
Wed -- 07:55 AM PST     1.67 feet High Tide
Wed -- 08:01 AM PST     Moonset
Wed -- 03:16 PM PST     0.28 feet Low Tide
Wed -- 05:44 PM PST     Sunset
Wed -- 07:22 PM PST     Moonrise
Wed -- 07:46 PM PST     2.06 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.2-0.2-0.4-0.20.41.11.51.71.51.31.21.10.80.50.30.40.91.51.921.81.41.1

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
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Wed -- 02:34 AM PST     8.41 feet High Tide
Wed -- 07:09 AM PST     Sunrise
Wed -- 08:05 AM PST     Moonset
Wed -- 08:50 AM PST     1.27 feet Low Tide
Wed -- 02:14 PM PST     9.46 feet High Tide
Wed -- 05:47 PM PST     Sunset
Wed -- 07:26 PM PST     Moonrise
Wed -- 09:27 PM PST     -0.96 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.66.88.28.37.45.94.22.71.61.32.24.16.58.49.49.27.963.81.70.1-0.9-0.70.7

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.
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Wind Forecast for Portland, OR (18,4,5,8)
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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.