Friday, August18, 2017 L-36.com


Marine Weather and Tides
Manchester, 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 6:27AMSunset 8:05PM Thursday August 17, 2017 11:40 PM PDT (06:40 UTC) Moonrise 1:10AMMoonset 3:53PM Illumination 17% Phase: Waning Crescent; Moon at 26 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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PZZ540 Point Arena To Point Reyes To 10 Nm- 856 Pm Pdt Thu Aug 17 2017
Tonight..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 12 seconds. Patchy fog after midnight.
Fri..SW winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft at 12 seconds. Patchy fog in the morning.
Fri night..W winds 10 kt. Wind waves 2 ft or less. NW swell 5 to 7 ft at 11 seconds and S 3 ft at 16 seconds. Patchy fog after midnight.
Sat..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 5 to 7 ft at 11 seconds. Patchy fog in the morning.
Sat night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 6 to 8 ft at 11 seconds.
Sun..W winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 6 to 8 ft.
Mon..W winds 10 kt. Wind waves 2 ft or less. NW swell 5 to 7 ft.
Tue..W winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft.
PZZ500 856 Pm Pdt Thu Aug 17 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 1027 mb high is centered 750 miles west of cape mendocino. A ridge will build from this high into the pacific northwest this weekend. This will result in increasing northwest windsover the northern waters.

7 Day Forecast for Marine Location Near Manchester, CA
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location: 38.95, -123.73     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 172152
afdeka
area forecast discussion
national weather service eureka ca
252 pm pdt Thu aug 17 2017

Synopsis High pressure will maintain hot weather conditions
for the interior through the weekend. Temperatures will moderate
early to mid next week.

Discussion
Upper level ridging remains in place over northwest california
resulting in warm and dry conditions across the region. The marine
layer has become quite compact today with strong subsidence along
the coast. The depth of the marine layer should remain fairly
consistent for the next few days as warm air remains aloft and the
marine inversion staying strong. High temperatures at the coast will
generally remain in the 60s while interior areas warm into the 90s
and near 100 degrees.

The only other concerns through the weekend will be offshore flow in
northern humboldt and del norte counties and strong north winds over
the coastal waters that will bring gusty winds to the immediate
coastline. This offshore flow will continue to bring dry air to the
humboldt and del norte coasts and warm conditions to the northern
del norte coastline. Additionally, numerous fires in siskiyou county
and southern oregon are spreading smoke over the region. This will
likely persist through at least Sunday morning.

Thickness values will begin to decrease late in the weekend as an
upper trough approaches the area. Temperatures will likely level out
or slightly fall as marine air intrusions extend farther inland.

This trough will then become a cutoff low to the west of central
california. Southeasterly flow on the east side of this low will
move moisture back north and model guidance indicates a chance for
convection over the interior mountains by Tuesday afternoon and
slight chances even by Monday. Precipitable water in the GFS is
around 0.75-1.00", indicating that storms will once again be wet.

However this hasn't been a problem lately in starting wildfires. See
the fire weather discussion below for more information about fire
weather concerns.

The increase in moisture and cloud cover may bring a few degrees of
cooling to the interior for early next week, but a much more
substantial trough will approach the area mid next week likely
allowing temperatures to fall back to near normal. Rpa

Aviation
Marines clouds continued across the north coast areas through
morning with very little penetration into adjacent coastal
river valleys. Also, smoke continued over portions of del norte
and humboldt counties today. Some ash was seen across several
humboldt locales from eka to acv.

Del norte experienced late evening MVFR-ifr conditions before
clearing out in the early morning into afternoon... Most likely due
to sufficient offshore flow.

Humboldt county wasVFR before briefly drooping to near "rock
bottom" (lifr)... Then clearing out this morning. With somewhat
breezy SW winds, a strange spaghetti looking formation of MVFR
stratus rolled back across the acv coast shortly after noonday and
lasted about 2 hours. Will watch acv as a southerly surge has
already pushed around CAPE mendocino. Right now the offshore
component may not inhibit the inflow of low clouds fog into the
terminal.

Mendocino coast continued to be saturated with the marine
clouds. High pressure seems to have slightly compressed the layer
from previous days.

Interior mountain and valley areas will remainVFR, although smoke
layers aloft will stretch over some areas... Especially in the
northern reaches.

Marine
The northerly winds have materialized as expected with bouy 27
gusting to 29 kts this afternoon. The current wind pattern will
continue through the weekend as high pressure builds over the
eastern pacific and a thermal trough strengthens over california.

The main area of strongest winds will persist over zone pzz470
(northern outer waters) while the other areas see moderate to
fresh breeze winds. Subsequently, steep seas have been building
with the largest waves occurring over the outer waters this
weekend.

Fire weather
Light to moderate offshore flow will persist across the upper
elevations of zones 203, 204 and 211 for the next several nights
and mornings. There will be subtle changes each night morning, but
the overall surface flow pattern changes very little going into
this weekend. The bottom line, hot and dry through the weekend.

The focus of attention for Friday looks to occur over the extreme
east side of the CWA around the alps and yolla bolla spine.

Soundings and profiles indicate the potential for cumulus cloud
build ups with the heating of the day but little chances of any
thunderstorm development.

Next week is looking much more favorable for storms if the models
are correct. The GFS continues to show a cut-off low forming off the
central california coast early next week. The GFS continues to
indicate southeasterly flow aloft as well as instability on Monday
and Tuesday. We may be in store for isolated wet storms on Monday
and again on Tuesday, primarily in zones 283 and 277. Confidence is
by no means high at this time due to the variability in the model
data that far out.

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters...

small craft advisory until 9 pm pdt Sunday for pzz450-475.

Gale warning until 9 pm pdt Sunday for pzz470.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ANVC1 - 9416841 - Arena Cove, CA 3 mi40 min WNW 1.9 G 6 55°F 54°F1016.8 hPa (+0.0)
46014 - PT ARENA - 19NM North of Point Arena, CA 24 mi30 min N 5.8 G 7.8 1016.4 hPa

Wind History for Arena Cove, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ukiah Municipal Airport, CA31 mi44 minN 010.00 miFair71°F57°F63%1013.8 hPa

Wind History from UKI (wind in knots)
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Last 24hrS5S4S5S3S4S4S3CalmCalmCalmE3CalmCalmE5CalmCalmNW10NW8N8N8CalmCalmCalmCalm
1 day agoS5S7S5SE3SE3S5S4S3CalmCalmCalmCalmCalm535NW11
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2 days ago4CalmS4CalmS4S3CalmCalmCalmCalmCalmE43SE9SW7--SW7
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Tide / Current Tables for Point Arena, California
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Point Arena
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Fri -- 03:07 AM PDT     Moonrise
Fri -- 03:08 AM PDT     -0.39 feet Low Tide
Fri -- 06:31 AM PDT     Sunrise
Fri -- 09:45 AM PDT     4.40 feet High Tide
Fri -- 02:37 PM PDT     2.29 feet Low Tide
Fri -- 05:51 PM PDT     Moonset
Fri -- 08:05 PM PDT     Sunset
Fri -- 08:50 PM PDT     6.53 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.310-0.4-0.20.61.62.73.74.34.44.13.52.82.42.32.73.54.65.66.36.56.15.1

Tide / Current Tables for Point Arena, California Current
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Point Arena
Click for Map
Fri -- 12:03 AM PDT     -1.40 knots Max Ebb
Fri -- 03:07 AM PDT     Moonrise
Fri -- 04:09 AM PDT     0.00 knots Slack
Fri -- 06:31 AM PDT     Sunrise
Fri -- 07:18 AM PDT     1.09 knots Max Flood
Fri -- 10:29 AM PDT     -0.00 knots Slack
Fri -- 12:46 PM PDT     -0.68 knots Max Ebb
Fri -- 04:03 PM PDT     0.00 knots Slack
Fri -- 05:52 PM PDT     Moonset
Fri -- 06:56 PM PDT     0.87 knots Max Flood
Fri -- 08:05 PM PDT     Sunset
Fri -- 09:47 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.4-1.3-1-0.6-0.10.50.91.110.80.3-0.3-0.6-0.7-0.6-0.4-00.40.80.90.70.4-0.1-0.8

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

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for Eureka, CA (2,6,7,8)
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Ground Weather Radar Station Sacramento, CA
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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.