Wednesday, May24, 2017 L-36.com


Marine Weather and Tides
Portland, OR

Version 3.4
What's New / NOTES
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 5:27AMSunset 8:47PM Wednesday May 24, 2017 6:30 AM PDT (13:30 UTC) Moonrise 4:09AMMoonset 6:27PM Illumination 1% Phase: Waning Crescent; Moon at 28 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- 256 Am Pdt Wed May 24 2017
.small craft advisory for rough columbia river bar in effect until 7 am pdt this morning...
In the main channel..Combined seas around 7 to 8 ft this morning and staying around 6 to 8 ft through tonight. However...seas temporarily build to 11 ft with breakers likely during the very strong ebb around 415 am this morning...and to 9 ft with breakers possible during the ebb around 530 pm this evening.
PZZ200 256 Am Pdt Wed May 24 2017
Synopsis for southern washington and northern oregon coast.. High pres over the waters with gusty winds continuing through Wednesday night. Winds ease Thursday through the weekend.

7 Day Forecast for Marine Location Near Portland, OR
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location: 45.53, -122.68     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 241045
afdpqr
area forecast discussion
national weather service portland or
344 am pdt Wed may 24 2017

Synopsis An upper level trough will continue to carve out over
washington and oregon today, with a disturbance moving through that
will maintain the onshore flow and clouds and produce some drizzle or
light showers especially north. The upper trough will linger through
Thursday with some late day thunderstorms possible over the cascades
but some afternoon sunshine west of the cascades. High pressure will
return Friday for drier, sunnier, and warmer weather. Warm and dry
conditions continue through the holiday weekend though a few late day
thunderstorms may be possible again over the cascades early next
week.

Short term Today through Friday... An upper trough will continue to
carve out over washington and oregon today in the wake of the rather
brisk system that brought a strong marine push to the forecast area
with breezy to windy conditions late Tuesday and Tuesday night. Temps
in the valleys today will be around 20 degrees cooler than on Tuesday
as onshore flow continues. While cloud cover has been somewhat broken
up overnight in the wake of the weak frontal boundary from Tuesday, a
disturbance dropping down into the upper trough over the area will
reinforce the clouds through the day today, possibly producing a bit
of drizzle or a few light showers especially north of about salem.

The main upper trough will linger Thursday, with the models continue
to indicate that some backdoor convection over the cascades is likely
Thursday afternoon and evening as moisture and instability on the
back side of the upper trough moves through. West of the cascades
should see a fair amount of morning clouds before breaking up some in
the afternoon and letting some sunshine through. Guidance suggests
that valley temps will rise onto the lower to mid 70s on Thursday.

Clouds will continue to decrease Thursday night and Friday as the
upper trough moves east and an upper ridge moves in. Friday looks
pretty warm as 850 temps suggest valley temps will reach the lower to
mid 80s under plenty of sunshine after local morning clouds as a
touch of summer returns. Tolleson

Long term Friday night through Tuesday. The models continue a
decent amount of agreement with a fairly strong upper ridge over the
pacific northwest this weekend that begins to edge slowly eastward
early next week. The models show some indications of convection over
the higher cascades in the late afternoon and evenings beginning late
Sunday. The threat of late day convection continues through early
next week over the cascades. Have lowered temps some around Tuesday
and Wednesday as the models show southwest flow aloft will lead to a
developing marine layer near the coast that will begin spreading
inland. Tolleson

Aviation Tough aviation forecast this morning as stratus did not
come in quite as guidance suggested. Based on satellite imagery, a
more solid mass of marine stratus appears to be heading toward the
coast and will make it to ast around 12z. This will progress down the
coast, making it to onp by 13-14z. Still think there is a decent
chance for low stratus with CIGS around 2500-3000 ft to make an
appearance after sunrise this morning, with stratus currently butted
up against the foothills of the cascades backbuilding into the
willamette valley, but this may be more broken meaning it may not
impact all terminals. This low stratus inland, if it develops, should
break up and lift to around 5000 ft by 16-18z forVFR conditions
inland through tonight. The coast, however, appears likely to hold on
to stratus with around 2500-3000 ft through tonight.

Kpdx and approaches...VFR conditions this morning. 50 percent chance
of stratus impacting the terminal from 14z-17z. After 17z, low
stratus breaks up and broken CIGS lift to around 5000 ft and persist
through tonight. -mccoy

Marine Pattern continues with high pressure over the NE pacific
and a thermal low inland combining to continue SCA wind gusts through
at least tonight. Will see decreasing winds overnight tonight as the
thermal low moves off to the east and the pressure gradient decreases
across the waters. Will first see winds within 10 nm of the coast
drop below SCA criteria later tonight, and then across the entire
waters Thursday morning. Benign conditions look to reign Thursday
afternoon through this weekend as the pressure gradient remains
relatively week across the waters.

Seas have come up a bit higher than forecast, particularly in the
northern waters where we have been seeing seas up around 9 to 11 ft.

Seas are very steep across all our waters with dominant wave periods
around 6 to 8 seconds. Expect seas to back down a bit this morning
before building back up near 10 ft this evening. Expect short wave
periods to continue through at least this morning. May need to extend
it through this evening if the background fresh swell never overtakes
the wind-wave component and dominant wave periods don't increase to
10 to 12 seconds. Low confidence in when this may happen. Seas will
start to ease Thursday and little threat of notable seas affecting
the waters through the weekend. -mccoy

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory for winds until 8 am pdt Thursday for
waters from CAPE shoalwater wa to florence or from 10 to
60 nm.

Small craft advisory for hazardous seas until 11 am pdt this
morning for coastal waters from CAPE shoalwater wa to
florence or out 60 nm.

Small craft advisory for winds until 11 pm pdt this evening for
coastal waters from CAPE shoalwater wa to florence or out
10 nm.

Small craft advisory for rough columbia river bar until 7 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 42 mi43 min 56°F1019.8 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 66 mi43 min 55°F1020.6 hPa
ASTO3 - 9439040 - Astoria, OR 74 mi43 min WNW 8 G 12 52°F 59°F1019.7 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi38 minWNW 410.00 miOvercast50°F41°F71%1020 hPa
Portland, Portland International Airport, OR7 mi38 minWSW 410.00 miMostly Cloudy50°F37°F63%1019.9 hPa
Portland, Portland-Hillsboro Airport, OR14 mi38 minN 010.00 miOvercast50°F39°F66%1019.7 hPa
Portland, Portland-Troutdale Airport, OR15 mi38 minN 010.00 miOvercast51°F39°F64%1020.1 hPa
Scappoose, Scappoose Industrial Airpark, OR19 mi38 minN 010.00 miOvercast46°F41°F83%1019.7 hPa
Aurora, Aurora State Airport, OR20 mi38 minN 010.00 miA Few Clouds48°F37°F68%1020.6 hPa

Wind History from PDX (wind in knots)
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Last 24hrCalmCalmNW3NW9N5W8NW6W10N8
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1 day agoCalmCalmW6W8W9W11W10W10W10W9W10NW8NW9NW6W7W9W7W5W4CalmCalmCalmNW3Calm
2 days agoCalmW3W4NW5W9W12W10W9NW10NW7NW7NW11NW7N7NW4W6W3W4NW4CalmCalmCalmCalmE3

Tide / Current Tables for Portland, Willamette River, Oregon - IGNORE HEIGHTS
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Portland
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

Wed -- 01:53 AM PDT     1.48 feet Low Tide
Wed -- 05:09 AM PDT     Moonrise
Wed -- 05:29 AM PDT     9.38 feet High Tide
Wed -- 05:30 AM PDT     Sunrise
Wed -- 02:51 PM PDT     -0.72 feet Low Tide
Wed -- 06:32 PM PDT     7.73 feet High Tide
Wed -- 07:26 PM PDT     Moonset
Wed -- 08:45 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.21.61.53.26.599.38.77.564.32.71.30.2-0.5-0.71.24.67.37.77.26.35.24.1

Tide / Current Tables for Vancouver, Washington - IGNORE HEIGHTS
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Vancouver
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

Wed -- 01:54 AM PDT     1.48 feet Low Tide
Wed -- 05:08 AM PDT     Moonrise
Wed -- 05:30 AM PDT     Sunrise
Wed -- 06:09 AM PDT     9.38 feet High Tide
Wed -- 02:52 PM PDT     -0.72 feet Low Tide
Wed -- 07:12 PM PDT     7.73 feet High Tide
Wed -- 07:27 PM PDT     Moonset
Wed -- 08:45 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.31.71.52.75.389.49.18.26.753.21.60.4-0.5-0.70.73.46.27.77.56.85.74.5

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Portland, OR (9,2,3,4)
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Ground Weather Radar Station Portland, OR
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weather_mapweather_map weather_map

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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.