Tuesday, September26, 2017 L-36.com

Marine Weather and Tides
Seneca, OR

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
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 7:38AMSunset 7:36PM Tuesday September 26, 2017 6:54 AM MDT (12:54 UTC) Moonrise 1:05PMMoonset 10:50PM Illumination 33% Phase: Waxing Crescent; Moon at 6 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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7 Day Forecast for Marine Location Near Seneca, OR
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location: 43.93, -118.64     debug

Area Discussion for - Pendleton, OR
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Fxus66 kpdt 261110 aaa
area forecast discussion... Update
national weather service pendleton or
410 am pdt Tue sep 26 2017
updated aviation discussion

Short term Today through Thursday night... The main feature in the
short term will be an upper ridge that is currently building over
the northeast pacific. It will slowly shift eastward and move into
the region this week with a warming trend and dry stable conditions.

However the warming trend will not be too strong due to the flow
being mostly out of the north to begin the warming trend. By the end
of the short term period (Thursday) the flow will become southwest
as the ridge axis moves to the east. This will allow stronger
warming to take place on Thursday. Skies will be mostly cloudy to
start the short term period (today), but they will gradually lessen
with skies becoming mostly clear by Thursday. Winds will be light
throughout the short term period and under 15 kts. 88

Long term Friday through Tuesday... The latest model guidance has
trended toward a much cooler and wetter weather pattern through the
extended period. There is solid support from the operational 00z
gfs, cmc, ECMWF and 00z GFS ens mean that a deep trough, supported
by a 130+ kt jet will approach and move through the forecast area
Friday through Saturday. Friday morning there will be slight chance
pops along the cascades for showers... With increasing clouds
spreading east. By Friday afternoon chances for showers make it as
far east as central oregon, the columbia gorge and yakima valley.

Finally, Friday evening and night the precipitation is now expected
to spread east, overtaking the entire cwa. Kept pops at slight
chance for the lower columbia basin, with high chance and some
likely pops in the mtns. On Saturday, this deep upper level trough
remains in place over the forecast area with a good chance for
additional showers. Temperatures and snow levels were also lowered
quite significantly from previous forecasts... With highs now
expected to only be in the 60s... Except upper 40s and 50s mountains.

Snow levels will be around 5000-6000 feet on Saturday as 1000-500mb
thickness drop to around 545dm. With the upper level low moving
overhead there could very well be enough instability due to the cold
temps aloft for isolated afternoon t'storms... But confidence was not
quite high enough to add these into the official forecast just yet.

The trough axis moves overhead Saturday afternoon, and just behind
the trough front expect westerly winds to become rather breezy

Likely between 15-25 mph. On Sunday, the aforementioned system is
forecast to move east, and gradually out of the area. However,
lingering showers are a good bet, especially over the eastern
mountains in the morning. The lower columbia basin and surrounding
areas should be dry, under partly cloudy skies on Sunday.

Temperatures remain cool, with highs in the 60s, except upper 40s
and 50s mountains. Snow levels remain near 5500-6500 feet. Heading
into early next week there is significant disagreement among the
various model guidance. The 00z GFS seems to be somewhat of an
outlier, and would keep the area under a northerly flow pattern on
the front side of a high amplitude offshore ridge. Meanwhile the
ecmwf, cmc and ECMWF ens mean suggest yet another upper level low
would drop into the pacific northwest Monday and Tuesday. With such
significant differences in the available guidance decided to take a
blend (mainly the superblend and wpc guidance) for this portion of
the forecast. This allowed for slight chances or chances for
additional showers over the forecast area Monday afternoon into next
Tuesday. Temperatures were also based off a blend of available
guidance and were again mainly in the 60s, except upper 40s and 50s
in the mountains for daytime highs. Overnight lows through the
extended period look to be in the 40s to lower 50s... .Except 30s in
the mountains. These temperatures are near to slightly below normal
for this time of year. 77

Aviation 12z tafs...VFR conditions will prevail through the
period. Some mid level strato-cumulus clouds are present this
morning, mainly affecting kpdt, kpsc and kalw with a bkn to ovc deck
between 8-12k ft agl. Other TAF sites are mainly clear this morning.

Any lingering clouds are expected to dissipate, giving way to skc
conditions this afternoon, evening and tonight as an upper ridge
builds overhead. Winds will remain light, AOB 10 kts and diurnally
terrain driven. 77

Preliminary point temps pops
Pdt 72 49 76 50 0 0 0 0
alw 72 54 77 53 0 0 0 0
psc 75 48 80 46 0 0 0 0
ykm 76 47 81 45 0 0 0 0
hri 76 48 81 45 0 0 0 0
eln 76 47 81 45 0 0 0 0
rdm 71 40 77 39 0 0 0 0
lgd 69 40 75 39 0 0 0 0
gcd 71 45 77 44 0 0 0 0
dls 78 51 82 49 0 0 0 0

Pdt watches warnings advisories
Or... None.

Wa... None.

88 77 77

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Burns Municipal Airport, OR29 mi62 minN 010.00 miOvercast46°F39°F77%1019.4 hPa

Wind History from BNO (wind in knots)
Last 24hrCalmCalmCalmE3Calm56SE65W4S3CalmS3SE4S4NE6NE6N4CalmCalmW3W4CalmCalm
1 day ago3CalmNE3CalmNE3Calm--NW6N8W8
2 days agoNE3W4NE3CalmCalmS43SE5N5E5CalmN4NW8W7NW8N6N6W6W8W8SW7CalmSW5W7

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of PacificNorthwest    EDIT

Wind Forecast for Pendleton, OR (8,2,3,4)
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Ground Weather Radar Station Boise, ID
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weather_mapweather_map weather_map

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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.