Saturday, July22, 2017 L-36.com


Marine Weather and Tides
Calpella, 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 6:04AMSunset 8:34PM Saturday July 22, 2017 3:54 AM PDT (10:54 UTC) Moonrise 4:20AMMoonset 7:04PM Illumination 2% 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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PZZ540 Point Arena To Point Reyes To 10 Nm- 228 Am Pdt Sat Jul 22 2017
.small craft advisory in effect through late tonight...
Today..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 5 to 7 ft at 8 seconds. Patchy fog in the morning.
Tonight..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 6 to 8 ft at 8 seconds. Patchy fog after midnight.
Sun..W winds 5 to 15 kt...becoming southeast in the afternoon. Wind waves 3 to 4 ft. NW swell 5 to 7 ft at 8 seconds. Patchy fog in the morning.
Sun night..SE winds 10 kt. Wind waves 2 ft or less. NW swell 5 to 7 ft at 9 seconds. Patchy fog after midnight. Patchy drizzle after midnight.
Mon..SE winds 10 kt. Wind waves 2 ft or less. NW swell 6 to 8 ft at 9 seconds. Patchy fog in the morning. Patchy fog after midnight. Patchy drizzle in the morning. Patchy drizzle after midnight.
Tue..W winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft. Patchy fog.
Wed..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft. Patchy fog.
PZZ500 228 Am Pdt Sat Jul 22 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific will shift to the northwest today as a thermal trough extends towards the central coast of california. As a result, winds will begin to decrease for most of the coastal waters. The northern outer waters, however, will remain gusty through the weekend.

7 Day Forecast for Marine Location Near Calpella, CA
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location: 39.21, -123.35     debug


Area Discussion for - Eureka, CA
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Fxus66 keka 212226
afdeka
area forecast discussion
national weather service eureka ca
326 pm pdt Fri jul 21 2017

Synopsis High pressure will continue to build across the
region through the weekend. Temperatures will warm significantly
across the interior. Coastal clouds and patchy fog will continue
to develop each night and early morning, burning off by late
morning. Isolated thunderstorms may develop across interior
portions of del norte and humboldt counties, and across northern
trinity county for Sunday and Monday.

Discussion It continues to look like pleasant weather will
continue into Saturday, as high pressure builds across the region
and an offshore flow pattern emerges. A significant warm up is
expected for the interior this weekend. Models continue to
indicate 850mb temperatures climbing to 24c to 27c on Saturday
and Sunday. Assuming a well mixed dry adiabatic layer, this is a
good indicator for temperatures reaching 100 to 105f in the interior
valleys.

An offshore flow patten will develop tonight and continue
through the weekend. The offshore flow should result in less
stratus penetrating into the coastal river valleys. At the same
time, the inversion will lower and strengthen which means
clouds fog confined to mainly the immediate coast. At the moment,
the northerly winds offshore appear to be sufficient to mix out
the stratus with the heating of the day. Temperatures will
continue to be pleasant and a tad above normal for the coast; mid
60s to lower 70s. You will not have to go very far inland to find
readings in the upper 70s and 80s. Farther inland, highs will be
quite toasty with highs well into the 90s, with valley hot spots
topping out around 100 to 105 degrees. Be sure to stay cool and
drink plenty of water.

By far the main forecast concern going into Sunday and Monday
will be the potential for thunderstorms and lightning activity,
mainly for the interior mountains. The models continue to indicate
an upper-level low approaching the northern california coast just
south of CAPE mendocino on Sunday. What has not been as
consistent is the rate at which the cyclonic circulation aloft
will progress eastward across the forecast area. The latest runs
have slowed down the eastward translation slightly and the threat
for storms appears to last through Tuesday.

The GFS and nam12 continues to indicate pwats around 1 inch
across del norte and far northern humboldt counties on Sunday as
the offshore low gains a slight negative tilt. The somes bar
bufkit sounding (from the nam) continue to show southeasterly
winds aloft with CAPE values in excess of 1500j kg, lifted indices
near -3c and lapse rates greater than 7.5c km. The mid level flow
pattern does appear to be a favorable for storms over the western
portions of the forecast area. There are indications we could see
high based storms out over the coast and over the coastal waters.

The models have been incongruent regarding storms over the coast
and waters, however. The GFS has been consistently indicating the
potential for some showers Sunday afternoon and evening, while
the nam12 and ECMWF have been dry as a bone. At this point, feel
the GFS may be overdone with the convection and will continue to
keep rain chances around 10% for coastal areas. This will need to
be watched closely. If planning outdoor activities this weekend,
keep abreast of the latest weather forecast and keep a watchful
eye on the sky.

For the middle to end of the week, drier southwest to westerly
flow will develop, with heights lowering as well. This will put an
end to thunder threat, while allowing temperatures to drop back
to more seasonal values for the interior.

Aviation Marine stratus (north of the cape) continued to lurk
along the coast, while also extending farther into the coastal
mountain & river areas this morning. Status began eroding to the
coast after midday as expected... Except at cec where clouds
scattered out a little earlier. However, CIGS and vis took a nose
dive at acv as lower clouds advected onto the coast towards late
morning. Around 930 am, MVFR CIGS had dropped into ifr and then
hit minimals of 200 feet and 1 4 miles... Lowering into lifr.

Stratus expectations may be a little lacking overnight mainly at
the cec airport as I concur with previous discussion that an
offshore component may limit stratus development. The 925 mb winds
clearly indicate a substantial offshore (northeasterly) wind
component overnight. MOS guidance is "somewhat" reflective of this
but still show a stratus cig around 8 am. South of acv can expect
the return of stratus iaw guidance. Inland mountain valley areas
will remainVFR. At this time, smoke from neighboring counties
will probably have no, or little impact on local flight
operations.

Marine Temperatures over northern california are forecast to
increase this weekend, which will aid in lowering surface
pressure, and subsequently tightening the gradient along the
coast. Northerly winds will increase as a result, with gale force
gusts forecast over the northern outer waters Saturday afternoon
through Monday afternoon. Large waves will build in response to
these winds especially for the outer waters. By midweek, model
guidance indicates the tight pressure gradient may shift slightly
westward, which would favor weakening winds across the coastal
waters. Jg kr

Fire weather High pressure aloft will build across the region
through Saturday resulting in strong warming and drying. Easterly
ridge top winds will also increase tonight and into the morning
hours on Saturday, as a surface trough develops near the coast.

The upper elevations will likely have poorer recoveries as a
result. Heading into the afternoon hours on Saturday, interior
temperatures of 95 to 105 degrees are expected, with very low
humidities in the afternoon. Gusty easterly winds will likely
develop across the upper elevations of del norte and far northern
humboldt counties Saturday night and Sunday morning.

As we head into the Sunday and Monday, a upper level low will
develop off the coast and interact with increasing instability. As
a result, a few thunderstorms may develop across eastern del
norte and humboldt counties, into northern trinity county.

Soundings continue to indicate cloud bases running near 8000 feet,
making gusty winds a concern in addition to the lightning with
any storm that develops. Drier westerly flow aloft will put an
end to our convective threat by mid week.

Eka watches warnings advisories
Ca... None.

Northwest california coastal waters... Small craft advisory from
10 pm this evening to 3 pm pdt Saturday for pzz470. Gale warning
from 3 pm Saturday to 5 pm pdt Monday for pzz470. Small craft
advisory until 5 pm pdt Monday for pzz475.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ANVC1 - 9416841 - Arena Cove, CA 28 mi55 min WNW 6 G 11 54°F 50°F1014.3 hPa (-1.1)
46014 - PT ARENA - 19NM North of Point Arena, CA 33 mi45 min N 18 G 23 1015 hPa

Wind History for Arena Cove, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Ukiah Municipal Airport, CA9 mi59 minN 010.00 miFair61°F51°F70%1012.8 hPa

Wind History from UKI (wind in knots)
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Last 24hrN3CalmW3N3N4CalmCalmCalm--N10N10N8
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Tide / Current Tables for Albion, California
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Albion
Click for Map
Sat -- 04:59 AM PDT     -1.25 feet Low Tide
Sat -- 05:22 AM PDT     Moonrise
Sat -- 06:06 AM PDT     Sunrise
Sat -- 11:57 AM PDT     5.02 feet High Tide
Sat -- 04:46 PM PDT     2.33 feet Low Tide
Sat -- 08:05 PM PDT     Moonset
Sat -- 08:35 PM PDT     Sunset
Sat -- 10:49 PM PDT     6.95 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.43.81.90.2-0.9-1.2-0.9-01.22.53.84.754.743.12.52.32.83.74.85.96.76.9

Tide / Current Tables for Mendocino, Mendocino Bay, California
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Mendocino
Click for Map
Sat -- 05:05 AM PDT     -1.31 feet Low Tide
Sat -- 05:22 AM PDT     Moonrise
Sat -- 06:06 AM PDT     Sunrise
Sat -- 11:46 AM PDT     4.68 feet High Tide
Sat -- 04:35 PM PDT     2.07 feet Low Tide
Sat -- 08:06 PM PDT     Moonset
Sat -- 08:35 PM PDT     Sunset
Sat -- 10:48 PM PDT     7.00 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.53.820.3-0.8-1.3-1-0.11.22.63.84.54.74.33.52.72.22.12.63.64.866.87

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 (6,6,7,8)
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Ground Weather Radar Station Beal AFB, 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.