Monday, March18, 2019 L-36.com


Marine Weather and Tides
Etna, CA

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 7:15AMSunset 7:21PM Monday March 18, 2019 6:34 PM PDT (01:34 UTC) Moonrise 3:43PMMoonset 5:09AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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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PZZ450 Pt St George To Cape Mendocino Out 10 Nm- 246 Pm Pdt Mon Mar 18 2019
Tonight..S winds 5 kt. Waves W 7 ft at 16 seconds. Patchy fog.
Tue..W winds 5 kt. Waves W 8 ft at 15 seconds. Slight chance of showers.
Tue night..NE winds 5 kt. Waves E 3 ft at 5 seconds...and W 8 ft at 14 seconds. Chance of showers.
Wed..N winds 5 kt. Waves W 8 ft at 13 seconds.
Wed night..NW winds 5 to 10 kt. Waves W 7 ft at 14 seconds.
Thu..SW winds 5 to 10 kt. Waves W 7 ft at 15 seconds.
Fri..S winds 10 to 20 kt. Waves S 5 ft at 8 seconds...and W 12 ft at 17 seconds.
Sat..NW winds 5 to 10 kt. Waves W 13 ft at 14 seconds.
PZZ400 246 Pm Pdt Mon Mar 18 2019
Synopsis for northern california waters..Generally light winds will prevail through today, with southerlies strengthening on Tuesday. Otherwise, a westerly swell train will continue through next week.


7 Day Forecast for Marine Location Near Etna, CA
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location: 41.34, -123.02     debug


Area Discussion for - Medford, OR
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Fxus66 kmfr 182159
afdmfr
area forecast discussion
national weather service medford or
259 pm pdt Mon mar 18 2019

Short term Tonight through Thursday night... Current observations
are showing mainly clear skies across southern oregon and
northern california. A coastally trapped wind reversal, indicated
by the clouds near the southern oregon coast has separated from
the oregon coast due to easterly winds. The chetco effect is
occurring, as our 1:30 pm observation at red mound is already 70
degrees. It's already 75 degrees here in at the medford airport,
and will increase a few more degrees this afternoon. We won't be
setting any records--which is at 82 degrees and occurred back in
1947.

Signs that this benign pattern is breaking down, however, are
apparent as winds have already become slightly more breezy across
portions of southern oregon and northern california. That being
said, I expect the coastally trapped wind reversal to come back
to the coast, providing a bit of fog for portions of the southern
oregon coast, from brookings north to pistol river.

Clouds will begin to move in Tuesday as a front passes through the
area from southwest to northeast. The front will likely arrive
late Tuesday night, so Tuesday will still be warm, but maybe a few
degrees cooler than today.

The precipitation will arrive on Tuesday morning into Wednesday,
and will provide some of the first precipitation we've seen in the
better part of a week. This front is not expected to be too
strong. Thus, we are only expecting light rain across portions of
southern oregon and northern california. Snow levels will start
off around 6000 feet and drop to around 5000 feet by Wednesday
night. Thus, snow will still fall on the higher elevations, but
snow impacts are not really expected for most of the passes.

Things turn more showery on Thursday as precipitation ends,
overall precipitation will be light. However, this feature really
begins a more active pattern, which could provide more impacts to
our area, and is described in more detail for the long term
discussion. -schaaf

Long term Friday through Monday night... A cold front will be
approaching the coast Friday morning, and south winds will
increase across the forecast area Friday afternoon. When looking
at naefs climatological data for this time of year, the winds
ahead of this front don't look very remarkable, so we're not
expecting strong winds with this system. What we'll likely get
with this front is about a 24 hour period of rain and mountain
snow across the forecast area Friday afternoon to Saturday
morning. Models suggest moisture will make it across the cascades
and bring a tenth to quarter inch of precipitation to areas east
of the cascades. A half inch to inch of precipitation is expected
at the coast and in siskiyou county, with around a quarter inch in
west side valleys.

Some lingering showers are expected Saturday, and dry conditions are
expected Sunday as upper ridging transits west to east across the
area. Operational models suggest another front could spread
precipitation inland by Monday afternoon, but there's enough spread
in ensemble data that Monday could very well be dry too. By Tuesday
wetter and cooler conditions likely return... With the national blend
of models (suite of many operational models and ensemble members)
outputting 70 percent chances of precipitation from the cascades
westward on Tuesday.

You may be wondering if any of this precipitation will fall as snow
in the mountains. Long answer short is... Yes. The more nuanced
answer is that snow levels will range from about 4000 feet to 6000
feet during the periods of precipitation. 5 to 10 inches of snow are
expected in the cascades, siskiyous, and high terrain of siskiyou
county above 5000 feet Friday into Saturday.

Aviation For the 18 18z tafs...VFR conditions will continue
through the TAF period. The first exception will be over the near-
shore coastal waters, where marine layer stratus and fog will
persist for several more hours. The second exception will be the
more sheltered valleys of the coastal range and lower umqpua
basin, where fog is possible late tonight into early tomorrow
morning. -bpn

Marine Updated 200 pm pdt Monday 18 march 2019... Low clouds and
fog cover most of the coastal waters south of CAPE arago. This wide
area of clouds will gradually drift north through tonight and into
Tuesday morning, with areas of drizzle and greatly lowered
visibilities possible along the immediate coast. Meanwhile, winds
and seas will remain relatively calm through Tuesday morning.

A gradual transition period for the coastal waters will begin by
Tuesday afternoon, marked by building long period westerly swell.

Seas will approach but not meet small craft advisory criteria
Tuesday and Wednesday, but bar conditions may be on the rougher side
due to the longer period component.

Conditions will deteriorate Thursday night as a front approaches the
region, with gusty south winds and steep to very steep seas expected
as the front makes its way onshore Friday. Long period westerly
swell of around 15 feet at 15 seconds will follow into the weekend,
before gradually decreasing through Sunday afternoon. -bpn

Mfr watches warnings advisories
Or... Beach hazards statement from 11 pm pdt this evening through
Tuesday afternoon for orz021-022.

Ca... None.

Pacific coastal waters... None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CECC1 - 9419750 - Crescent City, CA 68 mi34 min Calm G 2.9 1013.6 hPa (-0.7)
HBYC1 - 9418767 - North Spit, CA 75 mi58 min WNW 5.1 G 8 49°F 53°F1013.5 hPa
46244 - Humboldt Bay, North Spit, CA 77 mi34 min 54°F4 ft

Wind History for Crescent City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Shasta, CA37 mi38 minVar 310.00 miFair62°F15°F16%1017.4 hPa

Wind History from MHS (wind in knots)
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Last 24hrNW3CalmE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSE343SE3Calm3
1 day agoCalmCalmCalmCalmCalmCalmCalmNE3CalmCalmNE3CalmNE3CalmCalmCalm355Calm34W3W6
2 days ago3E4NE3CalmCalmCalmCalmCalmN3CalmCalm3CalmCalmCalm--5W4565644

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
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Mon -- 04:00 AM PDT     2.40 feet Low Tide
Mon -- 06:12 AM PDT     Moonset
Mon -- 07:23 AM PDT     Sunrise
Mon -- 09:57 AM PDT     7.02 feet High Tide
Mon -- 04:48 PM PDT     Moonrise
Mon -- 04:49 PM PDT     -0.83 feet Low Tide
Mon -- 07:26 PM PDT     Sunset
Mon -- 11:20 PM PDT     6.13 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.24.33.42.72.42.73.54.65.86.776.65.53.92.10.5-0.5-0.8-0.312.64.25.56.1

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
Click for Map
Mon -- 05:06 AM PDT     2.64 feet Low Tide
Mon -- 06:12 AM PDT     Moonset
Mon -- 07:23 AM PDT     Sunrise
Mon -- 11:02 AM PDT     7.48 feet High Tide
Mon -- 04:48 PM PDT     Moonrise
Mon -- 05:59 PM PDT     -0.73 feet Low Tide
Mon -- 07:26 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.95.64.83.832.62.93.74.96.27.17.57.16.14.52.60.9-0.3-0.7-0.30.92.54.25.6

Weather Map and Satellite Images
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wmap_P
GOES Local Image of CentralWestCoast    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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Wind Forecast for Medford, OR (21,6,7,8)
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Ground Weather Radar Station Medford, 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.