Saturday, April29, 2017 L-36.com


Marine Weather and Tides
Maywood Park, 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 5:58AMSunset 8:16PM Friday April 28, 2017 10:35 PM PDT (05:35 UTC) Moonrise 7:02AMMoonset 10:06PM Illumination 11% Phase: Waxing Crescent; Moon at 3 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- 840 Pm Pdt Fri Apr 28 2017
In the main channel..Around 4 ft through Saturday. However...seas temporarily near 8 ft during the very strong ebb around 730 am Saturday and to near 6 feet during the ebb around 815 pm Saturday.
PZZ200 840 Pm Pdt Fri Apr 28 2017
Synopsis for southern washington and northern oregon coast.. High pres will gradually build over the region today then shift inland over the pac nw this weekend. A weak front will push into the region Sat night...followed by another weak front early next week. Longer range indicates return of weak high pres towards middle of next week.

7 Day Forecast for Marine Location Near Maywood Park, OR
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location: 45.6, -122.55     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 290404
afdpqr
area forecast discussion
national weather service portland or
904 pm pdt Fri apr 28 2017

Synopsis Mild and dry weather will continue into Saturday, though
there will be a chill to the air tonight and Saturday morning. A
front dropping southeastward Saturday evening will spread rain across
the area, followed by decreasing showers Sunday. Another system
ejecting northeast from hawaii brings a small chance for rain late
Monday into Monday night, then high pressure is expected to dominate
for dry and warm weather midweek.

Short term Today through Monday... No changes were made to the
forecast this evening other than a couple minor tweaks to the wind
grids. Inherited forecast appears to be in very good shape, and
showers have ended across the forecast area as expected. Low temps
sat morning will be similar to this morning, so there could be some
patches of frost in the outlying valleys. Decided to leave it out of
the forecast though, since there is a fair chance that high clouds
over the NE pacific will spread into the forecast area by daybreak.

Forecast discussion from earlier this afternoon (below) remains
valid. weagle
previous discussion issued 307 pm Fri apr 28 2017 below:
water vapor satellite imagery shows a large trough digging southward
into the great basin and great plain states. Shortwave ridging
building into the northeast pacific has placed the pacific northwest
under large scale north to northwesterly flow aloft. High clouds
rounding the top of a shortwave ridge are pushing into the northeast
pacific and will arrive later tonight. Doppler radar and surface
observations continue to indicate a few light showers over the higher
terrain of the coast range and cascades. Expect these showers to
decrease rapidly this evening as shortwave ridging builds overhead
and surface heating wanes.

Expect a mostly clear and cool night tonight before clouds thicken
from northwest to southeast across the area on Saturday. Valley
high temperatures should climb into the 60s Saturday despite the
increasing cloud cover. A front dropping southeastward across the
area late Saturday should spread rain onto the south washington coast
as early as mid-late afternoon and into the willamette valley,
especially the northern half, during the mid to late evening hours on
Saturday. Some lingering low level instability may allow for a few
showers to persist into Sunday afternoon, but overall Sunday looks
considerably more dry than wet as shortwave ridging slowly
redevelops. Another shortwave trough riding up and over the ridge
could bring rain back on Monday, but the operational ec and many gefs
members shunt most of the moisture north of the cwa. Did raise pops,
but still kept them generally below climo since it appears Monday
stands a better chance of staying dry than turning wet. /neuman

Long term Monday night through Friday... A weak disturbance will
continue to bring a few showers to the forecast area late Monday.

Models continue to keep the bulk of the moisture to our north so
expect minimal accumulations. Conditions will then become warmer and
drier for a few days starting Tuesday as an upper level ridge builds
across the pac nw. Today's 12z runs show a slightly dirtier ridge
over the region next week, but given the forecasted 500 mb heights
and 850 mb temps, Wednesday is expected to be the warmest day of the
year thus far, with afternoon highs climbing into the low to mid 70s
across the willamette valley. The ridge starts to breakdown Thursday
as a weak frontal system approaches the region. Expect mostly cloudy
conditions to return by Thursday, with a slight chance of showers,
mainly over the cascades. Could also see a few thunderstorms over
the cascades on Thursday, but confidence is not high enough to add
it to the forecast. Conditions become a lot more uncertain late next
week due to model difference so will stick close to climo and keep
partly cloudy skies and a slight chance of showers in the forecast.

/64

Aviation Vfr conditions overnight. Expect high clouds moving
in to preclude any chances for fog or low stratus. Brief ridging
will drift across the region tomorrow forVFR conditions with
increasing high clouds. Low pressure will approach the coast
tomorrow afternoon and could bring light rain and CIGS 030-050 to
kast by 29/22z.

Kpdx and approaches...VFR conditions and light winds through the
period. /bentley

Marine No changes. Previous discussion follows. A front will
pass across the region late Sat and Sat evening with south to
southwesterly winds of 15 to 25 kt across the north and slightly
weaker winds for the central coastal waters. Seas will get a
minor bump, but stay under 10 ft. Once the front passes, winds
will ease back and turn more northwesterly.

High pressure aloft returns early next week with northerly winds
for the bulk of the time. However, the strength of the upper
ridge looks to be considerably weaker than 24 hours ago. This may
open the door for a brief southerly wind reversal Monday night
and early Tuesday. Seas appear to remain 7 ft or less through
that time. /jbonk

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

Wa... None.

Pz... Small craft advisory for winds from 11 am to 9 pm pdt Saturday
for coastal waters from CAPE shoalwater wa to cascade head
or out 60 nm.

Small craft advisory for winds from 2 pm Saturday to 1 am pdt
Sunday for coastal waters from cascade head or to florence
or out 60 nm.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 41 mi48 min 49°F1027.7 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 73 mi48 min 53°F1028.1 hPa
ASTO3 - 9439040 - Astoria, OR 77 mi48 min NNW 2.9 G 4.1 50°F 52°F1027.7 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Portland, Portland International Airport, OR3 mi43 minNW 510.00 miA Few Clouds51°F42°F71%1027 hPa
Pearson Airfield, WA6 mi43 minNW 410.00 miFair53°F43°F69%1026.9 hPa
Portland, Portland-Troutdale Airport, OR9 mi43 minWNW 310.00 miFair53°F41°F64%1026.6 hPa
Scappoose, Scappoose Industrial Airpark, OR20 mi43 minN 410.00 miFair49°F41°F74%1026.8 hPa
Portland, Portland-Hillsboro Airport, OR22 mi43 minNW 610.00 miFair48°F0°F%1026.8 hPa

Wind History from PDX (wind in knots)
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Last 24hrNW3W5W4W4W3CalmCalmE6S4S3CalmCalmNW6NW7W7NW3W8W8NW8W9NW7NW7N4NW5
1 day agoW5W6SW5W5W5CalmSW5SW5S7SW4SW5SW9SW9NW4SW6W7
G17
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2 days agoSW8SW9S4S6S5SW6SW7W11S6S6S7S7S7S6SW7NW9W10
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Tide / Current Tables for Ellsworth, Washington - IGNORE HEIGHTS
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Ellsworth
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

Sat -- 05:55 AM PDT     1.77 feet Low Tide
Sat -- 06:00 AM PDT     Sunrise
Sat -- 08:53 AM PDT     Moonrise
Sat -- 09:55 AM PDT     9.61 feet High Tide
Sat -- 06:48 PM PDT     -1.26 feet Low Tide
Sat -- 08:15 PM PDT     Sunset
Sat -- 11:22 PM PDT     7.79 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.36.353.72.721.83.168.69.69.28.16.54.62.71.1-0.2-1-1.20.33.267.6

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

Sat -- 05:31 AM PDT     1.77 feet Low Tide
Sat -- 06:01 AM PDT     Sunrise
Sat -- 08:54 AM PDT     Moonrise
Sat -- 09:29 AM PDT     9.61 feet High Tide
Sat -- 06:23 PM PDT     -1.26 feet Low Tide
Sat -- 08:15 PM PDT     Sunset
Sat -- 10:56 PM PDT     7.79 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.95.74.43.32.41.824.27.39.39.58.87.55.73.820.5-0.6-1.2-0.81.44.56.97.8

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 (1,6,7,8)
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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.