Tuesday, March28, 2017 L-36.com

Marine Weather and Tides
Scappoose, OR

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:55AMSunset 7:37PM Tuesday March 28, 2017 4:30 PM PDT (23:30 UTC) Moonrise 6:36AMMoonset 7:34PM Illumination 2% Phase: Waxing Crescent; Moon at 1 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
    EDIT      (on/off)   Help
PZZ210 Columbia River Bar- 226 Pm Pdt Tue Mar 28 2017
.small craft advisory for rough columbia river bar in effect through Wednesday morning...
In the main channel..Combined seas 12 to 14 ft ft through Wednesday morning. However...seas will temporarily build to near 18 ft with breakers during the strong ebb around 6 pm this evening...and during the strong ebb around 630 am Wednesday morning.
PZZ200 226 Pm Pdt Tue Mar 28 2017
Synopsis for southern washington and northern oregon coast.. A cold front will stall just outside of 60 nm this afternoon before moving across the waters this evening through Wednesday morning. High pressure builds Wednesday night and Thursday then holds over the waters on Friday. A weak front will move across the waters Saturday morning.

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

Area Discussion for - Portland, OR
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kpqr 282126
area forecast discussion
national weather service portland or
226 pm pdt Tue mar 28 2017

Synopsis Rain increasing this evening as front slowly approaches
from the west. This front will ensure quite a rain night and most of
Wednesday. Then decreasing showers on Thursday. Still looks like a
nice and mild few days for Fri and sat, though will see increasing
clouds on sat. Rain threat, while not all that great, returns for sun
into early next week.

Short term (tonight through Friday)...

first, up, due to upgrade with our system, do not have a lot of model
data to look over for the afternoon package. But, even so, not much
has changed in the short term.

Warm front lies well north of the region this afternoon, leaving the
region under cloudy and generally dry conditions. Still have
occasional light rain along the coast and into the coast mountains,
mainly to north of tillamook. It is mild, with many areas well into
the 50s as of 2 pm.

Noaa satellite imagery shows rather broad baroclinic zone well
offshore, extending from vancouver island back to the southwest. This
zone will slowly shift south and east this evening, with rain
spreading across the coastal zones early this evening, and inland
afterwards. May have hard time getting much rain to far southeast
corner of the forecast area, such as eastern lane and linn counties.

So, will keep pops lowest in that area, but will see spotty rain even
in the area later tonight.

Should be a decent shot of rain, as morning models were showing a
juicy plume of moisture along and ahead of the baroclinic zone.

Precipitable water values of 1.0 to 1.3 inches offshore aimed at
region for later today and tonight. So, seems like good rainfall for
a bit, with 1 to 3 inches tonight and Wed for the coast mountains,
and generally half to locally 1 inch for interior lowlands. But snow
levels rising, up to around 7000 to 8000 feet for tonight and wed.

So far this fall/winter season, we have had two months with record or
near record rainfall (october and february). Now, with rain expected
over the next 36 hours, could add a third month.

Models agree on dragging the trailing cold front into the region on
wed am, so will transition to showers in the north zones. But,
another wave on the boundary will approach and move into southwest
oregon later Wed and Wed evening. Net effect will be to slow the
fronts eastward progression, hanging it up over lane and linn
counties at that time. So, will keep rain into early evening for that
area, then transition to showers late Wed evening once the front
moves east.

Behind the front, a cooler air mass moves in, with the cold upper
trough moving through late Wed night into Thu morning. Expect
showers to become more orographically favored once the upper trough
passes Thu morning. In fact, Thu likely to be lot like it was
yesterday, with mix of Sun and clouds, with decreasing threat of

Now, for last day of march, or Friday. Appears march will go out like
a lamb, under partly to mostly sunny skies and mild temperatures.

High pressure will bring lighter winds, and good deal of sunshine.

Temperatures in the 50s on the coast, with upper 50s to lower 60s
inland. If mother nature cooperates, could even get into the middle
60s from salem southward. rockey.

Long term (fri night through Tuesday)... No changes. Previous
discussion follows. Model agreement is better through sat,
with a more progressive pattern over the region. Models continue to
show ridging east of the region on Saturday. Still looks dry and mild
on Saturday, with just increasing mid and high clouds. Now, while
there are still differences in the models, will have to keep some
minor threat of showers in forecast for Sat night into early next

Aviation MostlyVFR conditions across the region this
afternoon. CIGS will lower this evening along the coast and near
midnight in the willamette valley as a cold front nears and
steadier rain returns... With widespread MVFR conditions into
Wednesday morning. The coast may see occasional ifr conditions
late tonight. South winds could gust to around 30-35 kt along the
coast this evening through Wednesday morning, and to around 25-30
kt in the willamette valley.

Kpdx and approaches...VFR conditions this afternoon will
deteriorate to MVFR near midnight tonight with steady rain. S-se
winds may gust to 20-25kt late tonight into Wed morning. MVFR
cigs will likely persist most of wed. ~tj

Marine A low moving along an offshore front has stalled the
cold front just west of 60 nm this afternoon. South winds will
increase over the waters to gales as the low approaches this
evening and tonight. There will be an additional burst of strong
winds (gales) with the frontal passage early Wednesday morning.

Seas are a mix of a long-period (16-18 second)and a medium (12
second) period west swells... And steep south wind seas. Combined
seas are expected to build to around 15 ft tonight. Two strong
ebbs could result in breakers around 18 feet in the columbia
river bar this evening and Wednesday morning.

The winds will turn westerly and subside behind the front on
Wednesday. High pressure will build Wednesday night and Thursday
and hold through Friday for northwest winds and subsiding seas.

The seas will subside to below 10 ft on Thursday and remain
between 5 and 7 feet through Saturday. ~tj

Pqr watches/warnings/advisories
Or... None.

Wa... None.

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

Gale warning from 10 pm this evening to 7 am pdt Wednesday for
coastal waters from CAPE shoalwater wa to florence or out
60 nm.

Small craft advisory for hazardous seas until 10 pm pdt this
evening for coastal waters from CAPE shoalwater wa to
florence or out 60 nm.

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

Interact with us via social media:

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 28 mi43 min 45°F1024.2 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 56 mi43 min 51°F1025.6 hPa
ASTO3 - 9439040 - Astoria, OR 59 mi43 min S 13 G 22 50°F 46°F1023.5 hPa

Wind History for Longview, WA
(wind in knots)    EDIT      (on/off)   Help
1 day
2 days

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose, Scappoose Industrial Airpark, OR5 mi38 minS 810.00 miOvercast58°F43°F58%1024.2 hPa
Portland, Portland-Hillsboro Airport, OR12 mi38 minS 1410.00 miMostly Cloudy58°F42°F56%1024.3 hPa
Pearson Airfield, WA12 mi38 minS 810.00 miOvercast59°F39°F49%1024.6 hPa
Portland, Portland International Airport, OR16 mi38 minS 12 G 1910.00 miOvercast58°F39°F50%1024.8 hPa

Wind History from SPB (wind in knots)
Last 24hrSW10SW8SW5W4SW3S3SE3S6S7SE6SE6SE5S7S7S9S6S6S7S8S10S10
1 day agoCalmS5CalmCalmW3SW3CalmCalmCalmCalmNW4S4S4S7S3SE5S44S7S7SE7S9W10SW11
2 days agoN4N3N3CalmCalmCalmW3CalmCalmCalmCalmCalmCalmCalmS3S9S10

Tide / Current Tables for Rocky Point, Multnomah Channel, Oregon
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Rocky Point
Click for Map
Tue -- 02:12 AM PDT     -0.07 feet Low Tide
Tue -- 06:45 AM PDT     2.48 feet High Tide
Tue -- 06:58 AM PDT     Sunrise
Tue -- 07:36 AM PDT     Moonrise
Tue -- 02:29 PM PDT     0.67 feet Low Tide
Tue -- 06:52 PM PDT     2.73 feet High Tide
Tue -- 07:35 PM PDT     Sunset
Tue -- 08:33 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Kelley Point, Oregon - IGNORE HEIGHTS
   EDIT      (on/off)   Help   One Week of Data
Kelley Point
Click for MapNote: The Columbia River is subject to annual freshets. Short range predictions are available at local river forecast centers. The data for stations above Harrington Point apply only during low river stages. There is a tidal influence along most of the

Tue -- 03:29 AM PDT     0.20 feet Low Tide
Tue -- 06:58 AM PDT     Sunrise
Tue -- 07:35 AM PDT     Moonrise
Tue -- 07:48 AM PDT     8.88 feet High Tide
Tue -- 03:56 PM PDT     0.32 feet Low Tide
Tue -- 07:34 PM PDT     Sunset
Tue -- 08:07 PM PDT     8.69 feet High Tide
Tue -- 08:33 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
IR Satellite Image from GEOS

GOES Local Image of PacificNorthwest    EDIT

Wind Forecast for Portland, OR (19,4,5,8)
      (on/off)   Help

Ground Weather Radar Station Portland, OR
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.