Thursday, July20, 2017 L-36.com


Marine Weather and Tides
Shelter Cove, 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 6:01AMSunset 8:44PM Thursday July 20, 2017 3:37 PM PDT (22:37 UTC) Moonrise 2:23AMMoonset 5:08PM Illumination 8% Phase: Waning Crescent; Moon at 27 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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PZZ455 Cape Mendocino To Pt Arena Out 10 Nm- 232 Pm Pdt Thu Jul 20 2017
Tonight..NW winds 10 to 20 kt. Gusts up to 30 kt. Waves nw 6 ft at 6 seconds...and nw 2 ft at 12 seconds. Patchy fog.
Fri..NW winds 10 to 20 kt. Gusts up to 30 kt. Waves nw 5 ft at 6 seconds...and sw 2 ft at 13 seconds. Patchy fog.
Fri night..NW winds 10 to 20 kt. Gusts up to 30 kt. Waves nw 5 ft at 6 seconds...and sw 2 ft at 12 seconds. Patchy fog.
Sat..NW winds 10 to 15 kt. Waves nw 5 ft at 6 seconds.
Sat night..NW winds 10 to 20 kt. Waves nw 6 ft at 7 seconds.
Sun..NW winds 5 to 15 kt. Waves nw 6 ft at 7 seconds.
Mon..NW winds 5 to 15 kt. Waves nw 7 ft at 9 seconds.
Tue..NW winds 5 to 15 kt. Waves nw 5 ft at 7 seconds.
PZZ400 232 Pm Pdt Thu Jul 20 2017
Synopsis for northern california waters..Light north winds and small seas will persist across the northern waters through the work week while isolated gusts near 30 kt and steeper waves persist south of cape mendocino. Another round of strong north winds are forecast to return for the weekend this which will be accompanied with large, steep waves building in response.

7 Day Forecast for Marine Location Near Shelter Cove, CA
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location: 40.03, -124.07     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 201046
afdeka
area forecast discussion
national weather service eureka ca
346 am pdt Thu jul 20 2017

Synopsis Slightly cooler conditions for the interior through
today, then return of hot weather for the weekend into early next
week. After that, seasonable temperatures will be in store through
middle of next week. Along the coast, marine stratus will make its
daily advance and retreat.

Discussion Cooler than normal weather will continue through today
across the interior, courtesy of an upper level disturbance making
landfall into british columbia. This upper level disturbance brings
in cooler air aloft into NW california, with 850 mb temperatures
around 15 degree celsius for today. Forecasted high will be in
the 80s and low 90s for interior locations.

As the upper level disturbance heads inland, warmer air will return
to the area. Daytime highs on Friday will be about 5 degrees warmer
than today. Starting on Saturday, there will be a significant warmup
across the interior, with highs in the 90s to around 100 degrees
through the weekend into early next week. After that, looks like
there will be a slight cool down.

The 64000 dollar question remains to be the potential for showers
and thunderstorms this weekend over interior locations. For the last
few days, models have been trying to bring in an upper level
disturbance to northern california. However, the models have been
struggling with the timing and location of the disturbance. During
the overnight runs, both ECMWF and GFS came into better agreement.

They both now suggested a shortwave trough to develop off the coast
of northern ca on Saturday, then intensify and turn more to the
northeast towards or ca coast. This solution allows the upper level
disturbance to increase its transit time over NW ca waters. This
will allow it to draw in moisture from the south into NW california.

Gfs is forecasting pw of around 1.3 inches on Sunday over NW ca.

Lifted index will be less than 0, and CAPE will be more than 500
j kg. Think that there will be potential for showers and
thunderstorms. Right now, put in slight chance of showers and
thunderstorms for eastern del norte county for Sunday.

The upper level disturbance will move inland on Monday. After that,
looks like the longwave trough will be set up over the west coast,
and this will mean below average temperatures for the interior
locations.

Aviation Stratus is in place along the much of the redwood
coast this morning. The marine layer is quite deep and this is
keeping CIGS higher, in the MVFR range. The inversion is still
rather weak with the trough aloft so expected clearing back to to
coast by around midday. The mendocino coast is expected to remain
clear for much of the night, although it is possible there will be
a small amount of stratus possible along from point arena to fort
bragg. Any stratus that does form is expected to clear fairly
quickly this morning. Tonight the marine layer will remain deep
and ifr to MVFR CIGS are expected again along the redwood coast
late in the evening. Mkk

Marine Winds and seas remain unseasonably light this morning
in the northern waters. Buoys are reported waves of 1 to 2 feet.

Farther south along the mendocino coast conditions are not as
good. Buoy 14 is reporting seas around 6 feet and winds around 20
kt. Models show the strongest winds just south of CAPE mendocino
in a fairly narrow ribbon stretching south to buoy 14. This
pattern looks to persist through Friday. Have extended the sca
through 9pm for the southern outer waters. The majority of the
nearshore waters is expected to see winds less than 20 kt and
seas under 6 feet. Winds will diminish slightly tonight and
conditions will likely be near or slightly below SCA criteria for
a short period Thursday night into Friday morning.

Winds will start to increase Friday afternoon as the ridge of
high pressure builds in. These will increase to near gale by
Saturday afternoon with a few gusts to gale force. Steep short
period seas will build to 9 to 12 feet. Current model runs show
the northerly winds remaining around gale force Sunday in the
northern waters, but diminishing slightly in the southern waters.

This is due to an upper level low approaching the coast. At this
point there appears to be little to no surface reflection so winds
will not diminish much. Confidence is low on the exact track of
the low and winds may end up being lighter than expected.

Tuesday through Thursday additional weak systems will diminish
winds slightly. Current models are in decent agreement on them
being in the 20 to 25 kt range. Mkk

Fire weather Temperatures will be cooler today, with highs in the
80s to around 90 degrees. Do expect minimum rh of around 25 to 35
percent. With northwest winds around 10 mph during the daytime.

Seasonably hot temperatures will return to the area for the
weekend into early next week. With daytime highs around 100
degrees. For the weekend, higher elevation locations will see
poorer rh values and strong easterly winds aloft. Coastal areas
will remain seasonal with marine stratus to make its diurnal
advance and retreat through the weekend.

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters... Small craft advisory until 9 pm pdt this evening for pzz475.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46213 - Cape Mendocino, CA (094) 40 mi46 min 51°F3 ft
HBYC1 - 9418767 - North Spit, CA 52 mi62 min NNW 12 G 13 56°F 53°F1022.2 hPa

Wind History for North Spit, Humboldt Bay, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fortuna Rohnerville Airport, CA36 mi43 minWNW 1410.00 miA Few Clouds68°F53°F60%1021.3 hPa

Wind History from FOT (wind in knots)
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Last 24hrW14NW11W11NW8W9NW8W5W5W3W3W4W5NW6NW5NW4NW5N6N7NW8N9N9NW12NW11
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1 day agoNW8NW11
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W10NW10W8NW6W6W6W4W5W4W3W3W3CalmCalmNW3NW8NW8NW8
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NW11NW8NW9NW7NW6NW4NW3NW3W3W4CalmNW6NW6NW7W5CalmNW8NW6W7W8NW8NW7

Tide / Current Tables for Shelter Cove, California
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Shelter Cove
Click for Map
Thu -- 03:23 AM PDT     Moonrise
Thu -- 03:29 AM PDT     -0.56 feet Low Tide
Thu -- 06:04 AM PDT     Sunrise
Thu -- 09:59 AM PDT     4.38 feet High Tide
Thu -- 02:44 PM PDT     2.29 feet Low Tide
Thu -- 06:07 PM PDT     Moonset
Thu -- 08:40 PM PDT     Sunset
Thu -- 09:05 PM PDT     7.16 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.91.40.2-0.5-0.50.11.22.43.44.14.44.13.62.92.42.32.73.54.75.96.87.26.95.9

Tide / Current Tables for Punta Gorda, California Current
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Punta Gorda
Click for Map
Thu -- 12:16 AM PDT     -1.47 knots Max Ebb
Thu -- 03:24 AM PDT     Moonrise
Thu -- 04:20 AM PDT     0.00 knots Slack
Thu -- 06:04 AM PDT     Sunrise
Thu -- 07:23 AM PDT     1.12 knots Max Flood
Thu -- 10:38 AM PDT     -0.00 knots Slack
Thu -- 12:52 PM PDT     -0.72 knots Max Ebb
Thu -- 04:05 PM PDT     0.00 knots Slack
Thu -- 06:09 PM PDT     Moonset
Thu -- 07:01 PM PDT     0.93 knots Max Flood
Thu -- 08:42 PM PDT     Sunset
Thu -- 09:53 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.5-1.4-1.1-0.7-0.20.40.91.11.10.80.4-0.2-0.6-0.7-0.6-0.4-00.40.80.90.80.5-0.1-0.8

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 (18,4,5,8)
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Ground Weather Radar Station Eureka, 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.