Thursday, March21, 2019 L-36.com


Marine Weather and Tides
Portland, 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 7:10AMSunset 7:25PM Thursday March 21, 2019 2:51 PM PDT (21:51 UTC) Moonrise 7:29PMMoonset 6:58AM Illumination 99% 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- 235 Pm Pdt Thu Mar 21 2019
.small craft advisory for rough columbia river bar in effect until 8 pm pdt this evening...
.small craft advisory for rough columbia river bar in effect from late tonight through Friday morning...
In the main channel.. - general seas...5 to 7 feet through early Friday morning. Then, seas gradually building 8 to 9 feet by Friday afternoon. - first ebb...strong ebb around 615 pm today. Seas near 10 feet. - second ebb...strong ebb around 630 am Friday. Seas near 11 feet with breakers possible. - third ebb...strong ebb around 730 pm Friday. Seas near 15 feet with breakers possible.
PZZ200 235 Pm Pdt Thu Mar 21 2019
Synopsis for the southern washington and northern oregon coast.. A front will arrive on Fri, bringing gusty southerly winds and higher seas. High pres will rebuild over the pac nw this weekend. Unsettle weather returns next week, as another front arrives about Mon.


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 211723 aaa
afdpqr
area forecast discussion
national weather service portland or
1016 am pdt Thu mar 21 2019
updated aviation and marine sections.

Synopsis Low pressure over california will spread some clouds
into northwest oregon and southwest washington today along with a
slight chance of showers, mainly over the cascades. A chance of rain
comes Friday as a cold front moves through, followed by a chance of
post-frontal showers Saturday. More seasonable temperatures will
spread across the area for the next few days.

Short term Today through Saturday... Water vapor pictures showed a
negative tilt upper trough extending from off the oregon coast
southeast across california. Mid and upper level moisture will tend
to spread clouds up into the region today. Most models show some qpf
spreading into northwest oregon today, although time height cross
sections tend to show main lift in the upper levels. Will keep a
chance of showers over the cascades, but limit pops to a slight
chance west of the cascades. Several degrees of cooling is evident
at 850 mb in models today in response to lowering heights aloft,
which coupled with clouds should be enough to drop high temperatures
today into the 60s.

Chances for showers drop off this evening as the california low
moves east. Another shortwave being kicked out of the gulf of alaska
upper low moves inland Friday, pushing a modest cold front inland in
the afternoon. Deeper moisture with onshore flow accompanies the
front, although the shortwave appears to stretch as it moves inland.

Will carry higher pops with this system compared with earlier
systems ranging from likely to categorical. Several degrees more
cooling can be expected with this front, dropping temperatures back
close to seasonal normals. Trailing upper trough will keep a chance
for post-frontal showers through Saturday.

Long term Saturday night through Wednesday... No changes. Previous
discussion follows. The effects of the low that passes over the
forecast area Friday will dissipate through Saturday night. Sunday
will be dry based on a short-wave ridge ahead of the next large
system. Sunday night shows a slow moving low off the oregon coast
that will pass slightly south of the forecast area. This system will
bring precipitation Monday afternoon through Thursday. The coldest
temperatures during the day look to be on Monday due to the cold
front ahead of this system. Snow levels will stay above 3000ft so
only the cascades will see snow as this system passes. --bphillips

Aviation Weak front over southern oregon will lift north
today. Plenty of clouds across region, but no much in way of any
precipitation. Generally,VFR through tonight, with variable mid
and high clouds. Could see pockets of MVFR clouds through 20z to
south of portland. At the coast, primarily MVFR per goes-east
satellite product through midday though appears clouds decks will
be more scattered to broken in nature.

Kpdx and approaches... No adverse weather impacts through tonight.

Vfr to continue, with variable mid high clouds. Mh rockey.

Marine Weak pressure gradients will maintain southerly winds
10 to 15 kt today into tonight. Seas holding at 6 to 7 ft, but
strong ebbs will likely product rough bar conditions.

Next front will push into the region on fri, with gusty southerly
winds spreading northward across the coastal waters later in the
morning into the afternoon. Outer waters should have winds
gusting 30 to 35 kt Friday so a gale warning has been issued.

Small craft advisory continues for Friday for the 0 to 10 mi
offshore. Winds relaxing Fri evening. Seas will also build,
likely pushing 10 ft later this afternoon, and into the lower to
middle teens for Fri afternoon into the evening. Heavier fetch
of swell behind the front will arrive by evening, maintaining
seas 13 to 15 ft for Fri night through sat.

More tranquil weather for the weekend, with gradual return of
light offshore winds. Seas will gradually subside, but still
around 10 ft on sun. Mh rockey.

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Gale warning from 7 am to 3 pm pdt Friday for waters from cape
shoalwater wa to florence or from 10 to 60 nm.

Small craft advisory for winds from 9 am to 11 pm pdt Friday
for coastal waters from CAPE shoalwater wa to florence or
out 10 nm.

Small craft advisory for hazardous seas from 11 am Friday to 6
pm pdt Saturday for coastal waters from CAPE shoalwater wa
to florence or out 10 nm.

Small craft advisory for rough columbia river bar from 4 pm
this afternoon to 8 pm pdt this evening.

Small craft advisory for rough columbia river bar from 4 am to
9 am pdt Friday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 42 mi39 min 45°F1018.3 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 66 mi39 min 51°F1019.8 hPa
ASTO3 - 9439040 - Astoria, OR 74 mi33 min WSW 8 G 14 51°F 45°F1018.7 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi58 minVar 310.00 miPartly Cloudy58°F44°F60%1018.7 hPa
Portland, Portland International Airport, OR7 mi58 minN 410.00 miOvercast57°F43°F60%1018.9 hPa
Portland-Hillsboro Airport, OR14 mi58 minVar 410.00 miOvercast55°F45°F69%1018.9 hPa
Portland, Portland-Troutdale Airport, OR15 mi58 minS 510.00 miOvercast57°F44°F62%1018.8 hPa
Scappoose Industrial Airpark, OR19 mi58 minSE 410.00 miA Few Clouds58°F45°F62%1018.6 hPa
Aurora State Airport, OR20 mi58 minVar 310.00 miMostly Cloudy56°F46°F72%1019.3 hPa

Wind History from PDX (wind in knots)
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Last 24hrE16E16E13E14SE12SE13E12SE10SE12E8E8E6E74E7W5CalmCalmCalmCalmE3NE3NE4N4
1 day agoE15
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E11E12SE8S5S8S8SW5SE13E9E6CalmSE12E4SE9SE9SE12E7SE12E15
2 days agoE19
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E15E13SE13SE11SE5SE7CalmNE33CalmE95E15E15
G23
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G18
E15

Tide / Current Tables for Portland, Willamette River, 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 Vancouver, 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 (17,4,5,8)
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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.