Thursday, August24, 2017 L-36.com


Marine Weather and Tides
Etna, CA

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 6:26AMSunset 7:59PM Wednesday August 23, 2017 9:43 PM PDT (04:43 UTC) Moonrise 7:33AMMoonset 8:20PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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- 845 Pm Pdt Wed Aug 23 2017
.small craft advisory in effect from 5 am pdt Thursday through Friday evening...
Tonight..NW winds 5 to 10 kt. Waves nw 4 ft at 5 seconds... And nw 3 ft at 11 seconds. Patchy fog.
Thu..N winds 10 to 20 kt. Gusts up to 30 kt. Waves nw 7 ft at 7 seconds...and nw 4 ft at 13 seconds. Patchy fog.
Thu night..N winds 10 to 20 kt. Gusts up to 30 kt. Waves nw 8 ft at 8 seconds...and nw 4 ft at 12 seconds. Patchy fog.
Fri..NW winds 5 to 15 kt. Waves nw 7 ft at 8 seconds.
Fri night..NW winds 5 to 15 kt. Waves nw 7 ft at 8 seconds.
Sat..NW winds 5 to 10 kt. Waves nw 6 ft at 9 seconds.
Sun..NW winds up to 5 kt. Waves nw 5 ft at 8 seconds...and nw 3 ft at 12 seconds.
Mon..NW winds up to 5 kt. Waves N 4 ft at 7 seconds...and nw 4 ft at 11 seconds.
PZZ400 845 Pm Pdt Wed Aug 23 2017
Synopsis for northern california waters..Marine conditions will deteriorate through Friday as building high pressure brings increasing north winds. Strong northerlies and steep seas will persist through the work week with gale force wind gusts possible across the outer waters. The strongest winds will be primarily across the southern outer waters. Winds and seas are forecast to settle late this weekend into early 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 240417
afdmfr
area forecast discussion
national weather service medford or
917 pm pdt Wed aug 23 2017

Discussion An update to the forecast is not necessary. Isolated
thunderstorm activity in lake county early this evening moved off
into eastern oregon. The southern extent of a weak cold front will
bring a marine push into the coast and the umpqua valley tonight
into Thursday morning with areas of drizzle. The front will weaken
as it moves inland, but it will bring an increase of high clouds
and also gusty afternoon and early evening westerly winds that
will be strongest east of the cascades. Gusts will be in the range
of 10 to 20 mph on the west side of the cascades and 15 to 25
mph on the east side. There is also a slight chance of late day
thunderstorms in lake county, with the 00z NAM and GFS each
showing weak instability from the northern part of the county
northeastward. High pressure will bring a strong warming and
drying trend Friday into next week.

Aviation 24 00z TAF cycle... Along the coast... Over the
coastal waters... And in the umpqua basin... Areas of MVFR ifr
cigs vsbys will move into the umpqua basin tonight... Then burn back
to the coast by Thursday afternoon. Elsewhere, areas of MVFR vsbys
in smoke... Possibly ifr near fires... Will persist through Thursday.

Isolated thunderstorms east of the cascades will diminish
tonight..Then return Thursday afternoon and evening.

Marine Updated 830 pm pdt Wednesday 23 august 2017... A weak
thermal trough near the coast will strengthen Thursday... Bringing
increasing north winds and steep seas into the weekend. Winds will
increase to gale force south of CAPE blanco Thursday then persist
into Saturday with small craft advisory winds over the rest of the
area. The trough will weaken Sunday... And winds and seas will
diminish at that time.

Prev discussion issued 300 pm pdt Wed aug 23 2017
discussion... Satellite imagery this afternoon is showing our first
lightning strikes of the day in lake county, in close proximity
to shortwave activity that's moving northeastward through the
eastern portion of our CWA this afternoon. Thunderstorm chances
will continue through the afternoon and early evening over eastern
siskiyou, modoc, klamath, and lake counties. A red flag warning
highlights the expected new fire starts with abundant lightning on
dry fuels in northern modoc, eastern klamath, and lake counties.

Drier midlevels today and decreased midlevel moisture should keep
any thunderstorms from forming west of the cascades and over
western siskiyou county.

Tonight, a deep marine layer (2500-3000 ft per the north bend
profiler) will push inland tonight, reaching the umpqua divide with
some clouds likely spilling over into jackson and josephine county
valleys. The lift with the approaching frontal boundary, and the
deep marine layer, will help to bring drizzle and few hundredths
of an inch to the immediate coast and coastal valleys, along with
higher terrain from the cascade foothills in douglas county
westward.

Tomorrow, a mostly dry frontal boundary will push through the
forecast area. Enough moisture and instability will linger east of
the cascades tomorrow (in eastern klamath and lake) to provide a
slight chance for thunderstorms, so we've added that to the
forecast.

A sharp trend towards hotter and drier conditions begins on Friday
and continues through Monday Tuesday. Triple digit temperatures are
forecast for medford Saturday through Tuesday. Afternoon readings
will be about 10 to 15 degrees above normal. At this point there
looks like no need for heat-oriented watches or advisories, but
we'll assess the impact of smoke in the area limiting the ability to
open windows and bring in cool air from outside (for those without
air conditioning). There is no doubt that this will impact fires in
the area. Additionally, a thermal trough pattern at the coast will
set up again from Thursday through the weekend, and this really can
drive fire behavior via persistent northerly to easterly winds, low
humidity, and the potential for unstable conditions as the thermal
trough moves inland early next week. More on this can be found in
the fire weather discussion below.

Fire weather... Updated 2:00 pm pdt Wednesday, 23 august 2017... Lingering
cloud cover delayed thunderstorm development over the east side,
but visible satellite is showing several cumulus buildups, and a
few cg strikes have been observed in lake county over the past
hour. Models show high clouds diminishing and shifting eastward
this afternoon. If that doesn't pan out, thunderstorm activity
could be suppressed. However, with moderate instability in place
and a weak shortwave expected to pass over the east side over the
next few hours, we should continue to see at least isolated
thunderstorms this afternoon. Pw values are between 0.80 and 1
inch, therefore we can expect some localized wetting rainfall.

However, lightning can occur outside storm cores on dry to very
dry fuels and lead to many new fire starts. Also, there is high
potential for gusty and erratic winds near thunderstorms. The red
flag warning remains in effect for this afternoon and evening for
portions of the east side.

A cold front will pass over the area Thursday, bringing a slight
chance of thunderstorms to zone 624 and 625.

A thermal trough will set up along the coast Thursday night and we
could be looking at moderate recoveries along the mid slopes and
ridges in zone 618 and 619, including the chetco bar fire and
western fire zone 280. Right now recoveries look strong enough to
preclude red flag conditions.

A rapid warm up is expected Friday through at least early next week.

The thermal trough will remain along the coast Friday night into
Saturday, so we could be dealing with gusty northeast to east winds
near and at the ridges with moderate to possibly poor overnight
recoveries in fire zones 618, 619 and western 280. It remains to be
seen if recoveries will be as low as they were this past weekend,
but it's something that will need to be monitored.

The models suggest the thermal trough along the coast will weaken
and move inland Sunday night into Monday which could lead to
improved recoveries in fire zone 618 and possibly 619. In any case
weak onshore flow is expected with winds shifting to the north to
northwest. Relative humidities will be higher right along the coast,
but the onshore flow may not be strong enough for higher rhs at the
chetco bar fire. The bigger concern there will be breezy northwest
winds in the afternoon and evening hours.

Mfr watches warnings advisories
Or...

ca... None.

Pacific coastal waters... Small craft advisory until 5 am pdt Thursday
for pzz356-376.

Small craft advisory from 8 am Thursday to 5 am pdt Saturday for
pzz350-356-370-376.

Gale warning from 8 am Thursday to 5 am pdt Saturday for
pzz356-376.

Dw nsk jrs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CECC1 - 9419750 - Crescent City, CA 68 mi43 min SSW 4.1 G 6 55°F 60°F1016.7 hPa (-0.0)
HBYC1 - 9418767 - North Spit, CA 75 mi67 min NNE 7 G 8 53°F 56°F1017.6 hPa
46244 - Humboldt Bay, North Spit, CA 77 mi52 min 54°F3 ft

Wind History for Crescent City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Shasta, CA37 mi47 minN 010.00 miOvercast69°F52°F55%1015 hPa

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Last 24hrCalmE4NE3NE4E3E3CalmCalmCalmCalmCalmCalmCalmCalm3CalmCalm3--CalmCalmCalmCalmCalm
1 day ago3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE3--CalmCalmCalmCalm3CalmCalmCalm
2 days ago3CalmCalmNE3NE3NE3NE3NE4NE3CalmCalmCalmCalmCalmCalmCalmCalmCalmSE3CalmCalm43--

Tide / Current Tables for Trinidad Harbor, California
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Trinidad Harbor
Click for Map
Thu -- 01:43 AM PDT     6.80 feet High Tide
Thu -- 06:35 AM PDT     Sunrise
Thu -- 08:07 AM PDT     0.06 feet Low Tide
Thu -- 09:41 AM PDT     Moonrise
Thu -- 02:28 PM PDT     6.58 feet High Tide
Thu -- 08:01 PM PDT     Sunset
Thu -- 08:31 PM PDT     1.22 feet Low Tide
Thu -- 09:56 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.76.66.86.24.93.31.70.60.10.41.42.94.55.86.56.55.84.63.221.31.31.93.1

Tide / Current Tables for Arcata Wharf, Humboldt Bay, California
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Arcata Wharf
Click for Map
Thu -- 02:39 AM PDT     7.07 feet High Tide
Thu -- 06:35 AM PDT     Sunrise
Thu -- 09:04 AM PDT     0.11 feet Low Tide
Thu -- 09:41 AM PDT     Moonrise
Thu -- 03:27 PM PDT     6.77 feet High Tide
Thu -- 08:00 PM PDT     Sunset
Thu -- 09:28 PM PDT     1.30 feet Low Tide
Thu -- 09:56 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.866.976.45.13.51.80.60.10.51.63.14.766.76.75.94.73.32.11.41.42.2

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for Medford, OR (0,6,7,8)
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Ground Weather Radar Station Medford, 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.