Tuesday, April25, 2017 L-36.com


Marine Weather and Tides
Portland, 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 6:04AMSunset 8:12PM Tuesday April 25, 2017 7:34 AM PDT (14:34 UTC) Moonrise 5:04AMMoonset 6:22PM Illumination 0% Phase: New Moon; Moon at 29 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- 230 Am Pdt Tue Apr 25 2017
.small craft advisory for rough columbia river bar in effect until 7 am pdt this morning...
.small craft advisory for rough columbia river bar in effect from this afternoon through this evening...
In the main channel..Combined seas 7 ft through Tuesday. However...seas temporarily building to 11 ft with breakers likely during the strong ebb around 445 am...and to 10 ft during the ebb around 5 pm Tuesday.
PZZ200 230 Am Pdt Tue Apr 25 2017
Synopsis for southern washington and northern oregon coast.. A front moves into the waters later this morning and ashore late in the afternoon. Surface high pressure builds offshore for the latter half of the week.

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 250952 cca
afdpqr
area forecast discussion
national weather service portland or
252 am pdt Tue apr 25 2017

Synopsis Yes, virginia, there is more rain coming. Brief break in
the rain early today, but rain will spread across the region this
morning. More rain tonight, especially late tonight into early
Wednesday. Snow levels rise today, but will fall back to pass levels
in the cascades on Wed as cooler air arrives. Showers decreasing on
fri, with a dry mild day on tap for Saturday. But, threat of rain
returns on Sunday, although not great threat yet.

Short term... (today through Thursday)... Plenty of clouds across the
region this am, but not much in way of moisture. That will change
later this morning, as an occluded front offshore will spread more
clouds and rain to the coast by mid-morning, with rain spreading
across all of the remainder of the interior later this am into early
afternoon. Looks to be a rather wet afternoon and evening. Most areas
generally will get 0.20 to 0.50 inch of rain, with somewhat heavier
amounts over the higher terrain and coastal mtns.

Models insist on bringing another frontal system into the region
later tonight into Wed am. So, with that in mind, will see rain
tonight into Wed am. Now, could see somewhat of a lull in the rain
this evening behind the occluded front. Not a lot of cold air behind
the front, so not not much in way of showers. But, next system
arriving later tonight, so rain will start increasing along the coast
by late evening, quickly spreading inland after midnight. So, even
though may see a lull this evening, may not be last too long.

Cold front will push to the coast Wed am, and then across the
interior Wed afternoon. So, will see rain transition to showers on
wed. Snow levels will stay up tonight into Wed am, generally 5000 to
6500 feet. But snow levels lower Wed afternoon as colder air spreads
inland. Likely to see down to 3500 to 4500 feet by late wed
afternoon. Very well could see 3 to 7 inches of new snow in the
showers Wed afternoon and Wed night, as westerly flow aloft will
favor continued decent orographic uplift for the cascades.

Not much change on thu, as will maintain cool onshore flow with
showers. rockey.

Long term No changes. Previous discussion follows... Thursday night
through Monday... The strong jet aimed over the pacific northwest
during the middle of the week will slowly become more north-south
oriented and shift east of the region Thursday night and Friday. This
should result in decreasing showers during this period. Models are in
decent agreement that shortwave ridging will push over the pacific
northwest Friday night and Saturday and will bring some sunshine and
mild temperatures. This pleasant weather could last into Sunday, but
it could certainly be short lived based on the latest operational and
ensemble model guidance. As a result, trended pops into at least
mentionable thresholds and closer to climo for Sunday and Monday.

/neuman

Aviation A bit of a break in the rain ahead of the next
system.VFR prevailing across the area but there is some breaks
in cloud cover. This will allow a lower cloud layer to form in
the moist near surface layer for a several hours early this
morning, but do not expect it to be widespread. MVFR likely to
become more widespread with the front later today. Coastal areas
to see MVFR cigs/vis beginning after 15z and inland after 20z-
22z or so.

Kpdx and approaches...VFR conditions will remain through about
20z the chances for MVFR increase as rain increases. MVFR most
probable between 22z and 03z wed, through it may last longer into
the evening. Winds will be from the south through the day and
expected to remain below 15 kt. /mh

Marine Active weather pattern continues as there is another
system today that will likely bring high-end small craft
advisory wind and possibly brief low-end gales. For now will hold
on to the advisory for wind. Seas look to remain around 7 to 9
ft but may spike to 10-11 feet for a couple hours, so will add a
small craft advisory for hazardous seas for today.

Surface high pressure then begins to build offshore shunting the
surface lows mainly north of the waters and keeping a relative
lull in winds through Friday. Seas next reach 10-11 ft Thursday
through early Friday as the southern end of a swell train clips
the northern waters from a surface low crossing the alaskan
panhandle. /mh

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

Wa... None.

Pz... Small craft advisory for winds from 8 am this morning to 11 pm
pdt this evening for coastal waters from CAPE shoalwater
wa to florence or out 60 nm.

Small craft advisory for hazardous seas from 2 pm this
afternoon to 11 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 7 am
pdt this morning.

Small craft advisory for rough columbia river bar from 4 pm
this afternoon to 7 pm pdt this evening.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 42 mi46 min 49°F1016.6 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 66 mi46 min 51°F1015.5 hPa
ASTO3 - 9439040 - Astoria, OR 74 mi46 min E 1 G 1.9 46°F 51°F1014.9 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi41 minVar 310.00 miOvercast49°F45°F86%1016.7 hPa
Portland, Portland International Airport, OR7 mi41 minSSE 410.00 miMostly Cloudy47°F44°F90%1016.8 hPa
Portland, Portland-Hillsboro Airport, OR14 mi41 minN 010.00 miOvercast47°F45°F93%1016.3 hPa
Portland, Portland-Troutdale Airport, OR15 mi41 minN 010.00 miOvercast48°F45°F89%1016.7 hPa
Scappoose, Scappoose Industrial Airpark, OR19 mi41 minN 08.00 miLight Rain44°F43°F96%1016.5 hPa
Aurora, Aurora State Airport, OR20 mi41 minSSW 410.00 miOvercast47°F42°F83%1016.8 hPa

Wind History from PDX (wind in knots)
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Last 24hrE11SE12SE6E13SE12--S8NW13NW10NW6
G14
NW7W3N4N4S3CalmCalmSW6S8S5SE5CalmS8S4
1 day agoSE5S9S13S11
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S8SW8SW11S7SW7S8SW7S3S3SE4S5S5S6SE8E10E8E10SE9
2 days agoSW13SE5E9SE13S14
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SW14W17
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SW11W4NW3CalmCalmSW6S5S6SE3S4SE3SE4E6

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

Tue -- 02:32 AM PDT     0.78 feet Low Tide
Tue -- 06:03 AM PDT     Moonrise
Tue -- 06:07 AM PDT     Sunrise
Tue -- 06:09 AM PDT     8.94 feet High Tide
Tue -- 03:11 PM PDT     -0.06 feet Low Tide
Tue -- 06:45 PM PDT     8.20 feet High Tide
Tue -- 07:22 PM PDT     Moonset
Tue -- 08:10 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.11.30.91.13.778.98.77.96.75.23.72.31.20.3-014.27.38.27.86.95.74.4

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

Tue -- 02:33 AM PDT     0.78 feet Low Tide
Tue -- 06:03 AM PDT     Moonrise
Tue -- 06:07 AM PDT     Sunrise
Tue -- 06:49 AM PDT     8.94 feet High Tide
Tue -- 03:12 PM PDT     -0.06 feet Low Tide
Tue -- 07:22 PM PDT     Moonset
Tue -- 07:25 PM PDT     8.20 feet High Tide
Tue -- 08:10 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.41.40.912.95.88.28.98.57.45.94.22.71.40.4-00.73.26.188.17.46.24.8

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 (10,2,3,4)
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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.