Monday, April24, 2017 L-36.com


Marine Weather and Tides
Cathlamet, WA

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 6:05AMSunset 8:13PM Monday April 24, 2017 6:24 AM PDT (13:24 UTC) Moonrise 4:34AMMoonset 5:11PM Illumination 3% 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- 300 Am Pdt Mon Apr 24 2017
.small craft advisory for rough columbia river bar in effect until 6 am pdt early this morning...
.small craft advisory for rough columbia river bar in effect from 2 pm pdt this afternoon through this afternoon...
In the main channel..Combined seas 6 to 8 ft through Monday. However...seas temporarily building to 10 ft during the ebbs around 4 am and 415 pm Monday.
PZZ200 300 Am Pdt Mon Apr 24 2017
Synopsis for southern washington and northern oregon coast.. A fairly strong low and front will move ashore around cascade head early this morning. Another front moves across the waters Tuesday. Active weather continues through the week.

7 Day Forecast for Marine Location Near Cathlamet, WA
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location: 46.2, -123.38     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 240947
afdpqr
area forecast discussion
national weather service portland or
247 am pdt Mon apr 24 2017

Synopsis The first in quick moving series of pacific weather
systems will move across the pacific NW today bringing rain and
mountain snow. Another system arrives Tue and continues Tue night.

Moist onshore flow will continue the threat of showers Wed through
fri.

Short term Today through Wednesday... Water vapor imagery showed a
strong jet digging into SW or early this morning. Satellite and
surface data suggested a low off the central or coast, moving east
in line with model expectations. Isentropic lift has brought a wide
area of of rain to the region this morning. And should continue
until the surface low moves inland late morning and pushes a cold
front in, to be followed by the cool trough aloft. Moisture is deep
this morning with satellite derived precipitable water values on the
order of three quarters of an inch. As precipitation transitions to
showers in the afterrnoon, onshore flow behind the low will add
orographic lift to air in snow for the cascades. Will continue the
winter weather advisory today for the cascades, with snow levels
this morning suggesting heaviest amounts will generally be above the
main passes. 00z model soundings now suggest the potential for some
thunder with the showers late today with a narrow but sufficiently
deep unstable layer. Given the lack of apparent deep convection
offshore this morning, prefer to refrain from any mention of thunder
today at this time. With the surface low expected to track inland
east across the northern willamette valley, pressure gradients
peaking around 4 mb between kpdx and keug suggest a breezy day
mainly south of the low.

A bit of a break comes tonight with a shortwave ridge moving across.

This will diminish the chances for showers as warming aloft tends to
stabilize the air mass. The break though is short, as the next
system quickly arrives Tue thanks to the unseasonably strong zonal
jet over the east pacific. Models all tend to move a wave along a
baroclinic zone across the region Tue night, which should be
sufficient for high pops. GFS however is the most vigorous with this
system, showing the most promising isentropic lift between the 290k
and 300k isentropes Tue afternoon and evening, thanks in part to
another surge of deeper moisture. Other models not quite so
promising as to the depth of moisture, so at this time will be a
little more conservative with precipitation potential for Tue night
through Wed morning time period than GFS would suggest. Showers
continue through Wed as cooler air slips in with a continued moist
low level onshore flow.

Aviation A 1000 to 1003 mb low will move ashore near tillamook
around around 15z and move toward hood river by late morning. The
low will weaken as it moves inland. Gusty winds at the coast as
well as inland, south of kuao can be expected this morning.

Inland gusts most likely to reach 30 kt or so between 14z and
19z. As far as flight conditions coastal areas are expected to
remain predominantly MVFR in CIGS and vis as the low moves
ashore. Most guidance is holds MVFR at the coast through at least
06z tue, but there is some chances for improvement after that.

Inland, conditions will be a mix ofVFR and MVFR to start the
next TAF cycle. MVFR CIGS and vis should then become more
dominant and last through 21z with trends towardVFR after that.

Precipitation becomes showers after midday as the low/front
shifts east of the area. Could see some heavier showers and
cumulus buildups as the lower level instability could favor
fairly deep cell growth.

Kpdx and approaches...VFR to start out the 12z TAF package but
occasional MVFR conditions are expected through midday then
trending toward moreVFR. However heavier showers could briefly
bring MVFR CIGS and vis this afternoon into early evening. /mh

Marine A low pressure center approaching the central oregon
coast. There has not made the turn to the northeast as much as
models are indicating. As of 2 am, the center of the low is
around 44.5n 126.5w per satellite and surface analysis. This
places the low center about 1 degree south of where models have
it. The low should eventually turn a little toward the north, but
may make landfall closer to cascade head than tillamook as
earlier guidance indicated. Still though will keep gale warning
for the central oregon coastal water early this morning with
small craft advisories elsewhere. Wind shifts to the west south
of the low, while areas north of the low will see a more dramatic
wind shift from south to southeast to northwest by afternoon.

Active weather pattern continues as there is another system on
Tuesday that will likely bring high-end small craft advisory wind
and possibly brief low-end gales. The active pattern continues
through the end of the week.

Seas are currently hovering around 8 to 10 ft. Seas south of
cascade head will build to around 10 to 12 ft as winds ramp up
with the approaching low. Seas start to come back down in the
afternoon as this system moves inland. Tuesday seas look to
remain around 7 to 9 ft. Next time seas get up above 10 ft looks
to be Thursday with a fetch developing from a low off the coast
of british columbia. With this system models have backed off, now
only bringing seas up to 10 to 12 ft. Seas start to fall late
Friday and look to stay below 10 ft through next weekend.

/64/mccoy

Pqr watches/warnings/advisories
Or... Winter weather advisory until 8 pm pdt this evening for
cascades in lane county-northern oregon cascades.

Wa... Winter weather advisory until 8 pm pdt this evening for south
washington cascades.

Pz... Small craft advisory for winds until 2 pm pdt this afternoon
for coastal waters from CAPE shoalwater wa to cascade head
or out 60 nm.

Gale warning until 7 am pdt this morning for coastal waters
from cascade head or to florence or out 60 nm.

Small craft advisory for rough columbia river bar until 6 am
pdt early this morning.

Small craft advisory for rough columbia river bar from 2 pm
this afternoon to 6 pm pdt this evening.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ASTO3 - 9439040 - Astoria, OR 21 mi55 min NNW 2.9 G 8.9 46°F 51°F1004.1 hPa
LOPW1 - 9440422 - Longview, WA 23 mi55 min 49°F1006.2 hPa
46243 - Clatsop Spit, OR - 162 40 mi55 min 51°F7 ft
TOKW1 - 9440910 - Toke Point, WA 47 mi55 min E 14 G 16 46°F 52°F1005.1 hPa

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Kelso, Kelso-Longview Airport, WA26 mi29 minESE 810.00 miLight Rain46°F43°F89%1006.5 hPa

Wind History from KLS (wind in knots)
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Last 24hrSE3S4SE8S7S9S6S9
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S9S6S6W10CalmW5E4Calm--CalmCalmCalmCalm--CalmCalmCalm
2 days agoNW3CalmNW3Calm333NW4E11
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E6E9S4CalmCalmCalmN3CalmCalmCalmCalm--

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

Mon -- 01:41 AM PDT     8.46 feet High Tide
Mon -- 05:33 AM PDT     Moonrise
Mon -- 06:10 AM PDT     Sunrise
Mon -- 09:02 AM PDT     0.71 feet Low Tide
Mon -- 02:02 PM PDT     7.99 feet High Tide
Mon -- 06:10 PM PDT     Moonset
Mon -- 08:13 PM PDT     Sunset
Mon -- 09:10 PM PDT     0.78 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.68.18.47.86.553.42.11.10.71.43.25.47.287.66.65.13.62.21.30.81.33.1

Tide / Current Tables for Skamokawa, Steamboat Slough, Columbia River, Washington
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Skamokawa
Click for Map
Mon -- 01:13 AM PDT     7.64 feet High Tide
Mon -- 05:34 AM PDT     Moonrise
Mon -- 06:10 AM PDT     Sunrise
Mon -- 08:06 AM PDT     0.71 feet Low Tide
Mon -- 01:31 PM PDT     7.36 feet High Tide
Mon -- 06:10 PM PDT     Moonset
Mon -- 08:13 PM PDT     Sunset
Mon -- 08:16 PM PDT     0.92 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.97.67.36.34.93.52.21.20.71.12.64.56.27.27.26.453.72.51.511.22.54.5

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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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.