Saturday, August19, 2017 L-36.com


Marine Weather and Tides
Lagunitas-Forest Knolls, 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 6:28AMSunset 7:58PM Saturday August 19, 2017 11:26 AM PDT (18:26 UTC) Moonrise 3:09AMMoonset 5:39PM Illumination 7% 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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PZZ545 Point Reyes To Pigeon Point To 10 Nm- 837 Am Pdt Sat Aug 19 2017
Today..SW winds 10 kt. Wind waves 2 ft or less. Mixed swell nw 3 to 5 ft at 10 seconds and S 3 ft at 15 seconds. Patchy fog late in the morning.
Tonight..SW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 10 seconds. Patchy fog after midnight.
Sun..S winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft at 10 seconds. Patchy fog in the morning.
Sun night..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 10 seconds. Patchy fog after midnight.
Mon..SW winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft at 10 seconds. Patchy fog in the morning.
Tue..W winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 4 ft.
Wed..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 2 to 3 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 4 to 5 ft with a dominant swell period of 10 seconds. Across the bar...combined seas 4 to 6 ft with a dominant swell period of 10 seconds. Maximum ebb current of 1 knots at 02:24 pm Saturday and 1.9 knots at 02:00 am Sunday.
PZZ500 837 Am Pdt Sat Aug 19 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate, occasionally gusty, northwest winds will prevail across the northern outer waters and the san francisco bay through tonight as high pressure builds in from the west. Winds decrease for all waters by Sunday evening. Locally steep wind waves will also accompany increasing winds.

7 Day Forecast for Marine Location Near Lagunitas-Forest Knolls, CA
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location: 37.98, -122.74     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 191752
afdmtr
area forecast discussion
national weather service san francisco bay area
1052 am pdt Sat aug 19 2017

Synopsis A few degrees of cooling are expected over the
weekend and into early next week as an approaching trough of low
pressure weakens the area of high pressure currently over the
eastern pacific. Coastal areas will see little in the way of
change with continue night and morning low clouds and patchy fog.

Discussion As of 08:09 am pdt Saturday... Non-operational and
experimental goes-16 visible channels reveal another morning of
stratus for much of the san francisco bay area and central coast.

The low clouds even managed to reach parts of the inland east bay
earlier this morning, including livermore where overcast
conditions were observed from 5 am pdt to the present. Satellite
also depicts the low clouds pushing well into the salinas valley
and coming within about 15 miles of the monterey-san luis obispo
county line. Most communities that are blanketed with low clouds
at this time can expect a gradual transition to mostly clear skies
by late morning, though there could be some lingering clouds
along the immediate coastline. An upper level low near point
conception will allow for 2 to 4 degrees of cooling compared to
yesterday for interior areas this afternoon as height and
thickness values decrease.

No major updates planned for the forecast package this morning.

Please refer to the previous discussion section for additional
details.

Prev discussion As of 3:05 am pdt Saturday... Widespread low
cloud will encompass area across the forecast area located below
the 1500 ft inversion currently in place. Satellite imagery
reveals stratus from cloverdale in northern sonoma to as far south
as bradley in southern monterey county. Low clouds are
anticipated to clear to the coast by noon followed by mostly sunny
skies across the interior through the remainder of the day.

Temperatures will cool a few degrees inland this afternoon
compared to Friday as an upper level low forms over point
conception resulting in a steep decline in 500mb height and 850mb
temperature values. Little if any change is expected along the
coast where low clouds will help moderate the temperature.

Anticipate 60s along the coast, 70s around the bay and 80s and 90s
inland. Temperatures will continue to cool a few degrees per day
on Sunday and Monday. The upper low will remain centered over
point conception through Tuesday before gradually weakening and
shifting to the north and east. Temperatures are forecast to
flattening out on Tuesday with very little change expected through
the remainder of the week.

For Monday morning's solar eclipse... If conditions permit, the
partial solar eclipse can be viewed throughout california. Right
now, models are all in good agreement that the upper level low
will remain parked near point conception in southern california.

For us along the central coast and north to the san francisco bay
area, this yields a few outcomes. For one, the low can help mix
out the marine layer, resulting in mostly clear conditions. On the
other hand, the upper low could help to enhance the marine layer
depth. We'll know a little bit more over the weekend and will
continue to monitor the marine layer's response to the trough.

Climatologically, the best locations in the bay area for clear
skies on a mid late august morning would be interior areas of the
east bay away from the coast, as well as the higher elevations in
the santa cruz mountains, north bay mountains, and diablo range.

The eclipse of the Sun will begin shortly after 9:00 am pdt for
the bay area with peak obscuration happening around 10:15 am pdt.

Peak obscuration of the Sun will range from 71 percent in monterey
and up to 78 percent in santa rosa.

Aviation As of 10:45 am pdt Saturday... Slow eroding of the
stratus will continue through late morning and into the early
afternoon. All TAF sites are expected to beVFR by 20z. Marine
layer is still holding at around 2000 feet at this hour.

Anticipate MVFR ifr CIGS to return tonight for most sites. Breezy
onshore winds will occasionally become gusty this afternoon.

Vicinity of ksfo... CIGS are starting to lift and scatter out
around the terminal, though still not confident on exact clearing
time. Breezy to gusty afternoon winds, sustained around 15 kt,
with gusts near 20 kt at times. Similar marine layer timing and
cigs for tonight.

Sfo bridge approach... Clearing over bridge may occur around the
same time as terminal. Confidence is high with clearing slightly
after 18z.

Monterey bay terminals... MVFR CIGS holding strong over mb
terminals. Ksns should clear by 1830z, though this will be
monitored. Still anticipate kmry to clear by 20z, but confidence
is still low at this time. Brief afternoon clearing will precede
an early return of stratus by early this evening. Light to
moderate onshore winds this afternoon.

Marine As of 10:31 am pdt Saturday... Moderate, occasionally
gusty, northwest winds will prevail across the northern outer
waters and the san francisco bay through tonight as high pressure
builds in from the west. Winds decrease for all waters by Sunday
evening. Locally steep wind waves will also accompany increasing
winds.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm
sca... Sf bay
public forecast: rowe cw
aviation: bam
marine: bam drp
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 13 mi39 min E 1.9 G 6 62°F 61°F1013.9 hPa
46237 - San Francisco Bar, CA (142) 15 mi57 min 59°F5 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi37 min S 5.8 G 7.8 58°F 58°F6 ft1014.2 hPa (+0.6)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi50 min S 9.9 60°F 1014 hPa
RCMC1 - 9414863 - Richmond, CA 18 mi45 min SW 5.1 G 8.9 61°F 65°F1013.7 hPa
FTPC1 - 9414290 - San Francisco, CA 19 mi45 min WSW 8.9 G 12 59°F 62°F1014.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi39 min SSW 9.9 G 14 61°F 1014.2 hPa
PXSC1 22 mi39 min 61°F 58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi45 min W 4.1 G 12 60°F 1013 hPa
OBXC1 24 mi39 min 60°F 58°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi39 min W 8 G 11
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi39 min W 8 G 9.9 60°F 1014.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi39 min WSW 8.9 G 12 62°F 1013.3 hPa
AAMC1 - 9414750 - Alameda, CA 27 mi39 min W 6 G 9.9 61°F 68°F1014.5 hPa
LNDC1 27 mi39 min W 8 G 9.9 61°F 1014.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi39 min W 12 G 17 63°F 69°F1013.3 hPa60°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 35 mi27 min NNW 5.8 G 7.8 54°F 55°F1014.4 hPa (+0.4)54°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi39 min WSW 15 G 21 63°F 69°F1012.8 hPa
46214 - Point Reyes, CA (029) 39 mi27 min 62°F10 ft
SFXC1 - San Francisco Bay Reserve, CA 41 mi102 min WNW 11 64°F 1012 hPa59°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 43 mi37 min SSE 5.8 G 7.8 59°F 62°F8 ft1013.7 hPa (+0.7)
RTYC1 - 9414523 - Redwood City, CA 43 mi39 min NNW 7 G 8.9 63°F 72°F1013.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi39 min NW 18 G 23 66°F 1011.7 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA15 mi52 minN 710.00 miPartly Cloudy66°F57°F73%1013.9 hPa
Petaluma Municipal Airport, CA20 mi32 minN 0 G 109.00 miOvercast61°F59°F94%1013.9 hPa

Wind History from DVO (wind in knots)
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Last 24hr4N7N10N15N15N12
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N12N12N7NW5CalmN6NW5NW5N6N5N5N5N5CalmCalmN7N8
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2 days agoSE7NE8SE74NE11N10N11N12N7N5
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N7N6NW5CalmCalmCalmCalmSW3SW3CalmCalm545

Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Sat -- 04:09 AM PDT     Moonrise
Sat -- 04:52 AM PDT     -0.38 feet Low Tide
Sat -- 06:29 AM PDT     Sunrise
Sat -- 11:10 AM PDT     3.60 feet High Tide
Sat -- 04:43 PM PDT     1.40 feet Low Tide
Sat -- 06:37 PM PDT     Moonset
Sat -- 07:57 PM PDT     Sunset
Sat -- 10:10 PM PDT     4.75 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.22.21.10.3-0.2-0.4-0.10.61.52.43.23.63.532.41.91.51.41.82.63.54.34.74.6

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Sat -- 01:20 AM PDT     -1.50 knots Max Ebb
Sat -- 04:10 AM PDT     Moonrise
Sat -- 05:20 AM PDT     0.00 knots Slack
Sat -- 06:31 AM PDT     Sunrise
Sat -- 08:28 AM PDT     1.22 knots Max Flood
Sat -- 11:38 AM PDT     -0.00 knots Slack
Sat -- 02:02 PM PDT     -0.79 knots Max Ebb
Sat -- 05:17 PM PDT     0.00 knots Slack
Sat -- 06:39 PM PDT     Moonset
Sat -- 07:59 PM PDT     Sunset
Sat -- 08:10 PM PDT     0.97 knots Max Flood
Sat -- 11:01 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.2-1.5-1.4-1.2-0.8-0.20.40.91.21.20.90.4-0.2-0.7-0.8-0.7-0.5-0.10.40.810.90.60

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 San Francisco/Monterey Bay Area, CA (14,3,4,5)
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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.