Wednesday, December13, 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 7:16AMSunset 4:53PM Wednesday December 13, 2017 2:47 AM PST (10:47 UTC) Moonrise 2:55AMMoonset 2:28PM Illumination 25% Phase: Waning Crescent; Moon at 25 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- 235 Am Pst Wed Dec 13 2017
Today..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 4 to 6 ft at 12 seconds.
Tonight..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 4 to 6 ft at 15 seconds.
Thu..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 5 to 7 ft at 17 seconds.
Thu night..N winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 6 to 8 ft at 18 seconds.
Fri..N winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 6 to 8 ft at 16 seconds.
Sat..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 4 to 6 ft.
Sun..NE winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 4 to 6 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 5 to 7 ft at 13 seconds. Across the bar...combined seas 6 to 8 ft at 13 seconds. Maximum ebb current of 1.5 knots at 12:48 pm Wednesday and 0.7 knots at 12:36 am Thursday.
PZZ500 235 Am Pst Wed Dec 13 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwesterly winds will prevail and increase over the ocean waters through the rest of the week. A cold front is forecast to pass over the waters Friday evening and into Saturday morning, further increasing northwest winds behind the front. In addition, northwest swell will also increase beginning Thursday.

7 Day Forecast for Marine Location Near Lagunitas-Forest Knolls CDP, 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 131034
afdmtr
area forecast discussion
national weather service san francisco bay area
234 am pst Wed dec 13 2017

Synopsis High pressure continues to produce offshore winds
today with clear skies and above normal temperatures. Dry weather
will likely continue through the weekend. A passing system may
bring rain chances to the bay area late next week.

Discussion As of 2:30 am pst Wednesday... Latest surface
analysis continues to show a robust surface high over the great
basin and trough of low pressure along the coast. This orientation
of highs and low is perfect for offshore flow. The latest pressure
gradient from sfo-wmc is about 11 mb. General rule of thumb is
anything greater than 10 mb is pretty good for offshore flow. That
being said, some breezy to windy conditions prevail across the
ridge tops around the bay area. Mt diablo has reported numerous
gusts around 40 mph. Other locations across the east bay hills
have gusts exceeding 20-25 mph. The offshore flow has also led to
some rather impressive relative humidity values overnight. Santa
rita peak in san benito county has hung around 2-4% for most of
the night. Chews ridge on the other side of the salinas valley
remains at 5%. Lastly, locations that have been windy and dry are
also mild with temps in the upper 50s. Needless to say, the
combination of mild, dry and windy conditions will keep heightened
fire weather concerns across mid and upper slopes.

Elsewhere, temperatures are much colder and winds are weaker to
calm. Favored locations like bradley, parkfield and other
protected valley locations are dipping into the mid upper 20s.

Patchy frost will remain in the forecast for these locations, but
airmass is dry so not expecting widespread frost. Ksts is also
reporting fog so freezing fog will be possible across the north
bay valleys.

Despite a chilly start this morning, today will be a very pleasant
day around the region with well above normal temperatures. The
overall airmass is forecast to warm slightly combined with
offshore flow will lead to temperatures in the mid 60s to lower
80s, or about 5 to 20 degrees above normal depending on locations.

High pressure remains in place on Thursday leading to another mild
and dry day. A shift in the pattern on Friday as high pressure
weakens with a passing upper trough and weak cold front. Latest
models drop this feature south through the region Friday night
into Saturday. All models keep the forecast dry with this passing
feature, but the GFS and local WRF really ramp up winds Friday
night Saturday morning across the north bay mts and east bay
hills. Gusts over 50 mph will be possible. Will have to keep an
eye on this and may need at least a wind advisory over the
weekend. High pressure rebuilds behind this feature Sunday into
early next week with mild and dry conditions.

There continues to be some hope in the extended as longer range
models bring a slight poss for precip to return to the region late
next week. The latest GFS ensemble probability has a 20% of sfo
hitting 0.01 inches of rain on december 21. We'll see, but it
doesn't look promising. The latest CPC 8-14 day outlook shows much
of ca below normal through dec 26.

Aviation As of 10:00 pm pst Tuesday... Offshore flow will
continue through the next 24-36 hours. Light winds will allow
patchy fog in the north bay valleys through 15z.

Vicinity of ksfo...VFR.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. E-se winds to 10 knots after 08z at
sns.

Climate
Here is a list of record high temperatures along with the most
recent date it occurred.

Sf bay area december 13 december 14

Location
Healdsburg... ... ... ... .. 76 1911 77 1942
santa rosa... ... ... ... .. 74 1958 72 1956
kentfield... ... ... ... ... 73 1911 70 1942
san rafael... ... ... ... .. 69 1950 70 1959
napa... ... ... ... ... ... .. 72 1934 73 1959
san francisco... ... ... .. 71 1911 69 1988
sfo airport... ... ... ... . 69 1958 69 1958
oakland airport... ... ... 70 1958 65 1958
richmond... ... ... ... ... . 75 1958 67 1983
livermore... ... ... ... ... 73 1958 75 1958
moffett field... ... ... .. 68 1953 72 1958
san jose... ... ... ... ... . 70 1958 73 1958
gilroy... ... ... ... ... ... 78 1958 72 1988
monterey bay area

Location
Monterey... ... ... ... ... . 77 1953 78 1953
santa cruz... ... ... ... .. 77 1944 82 1953
salinas... ... ... ... ... .. 79 1958 80 1988
salinas airport... ... ... 80 1953 81 1953
king city... ... ... ... ... 79 1936 83 1958

Marine As of 09:59 pm pst Tuesday... Offshore flow is weakening
and will allow winds to switch to northwest the next few days.

Northwest winds and swell will increase Friday as an upper level
shortwave moves through the area.

Mtr watches warnings advisories
Tday None.

Public forecast: mm
aviation: W pi
marine: W pi
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 13 mi48 min Calm G 1.9 54°F1021.3 hPa (-0.6)
46237 - San Francisco Bar, CA (142) 15 mi48 min 54°F7 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi58 min N 1.9 G 1.9 53°F 53°F8 ft1021.7 hPa (-0.5)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi54 min W 1.9 49°F 1022 hPa
RCMC1 - 9414863 - Richmond, CA 18 mi48 min N 8 G 9.9 50°F 54°F1021.7 hPa (-0.6)
FTPC1 - 9414290 - San Francisco, CA 19 mi48 min NNE 8 G 8 51°F 53°F1022.1 hPa (-0.6)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi48 min N 12 G 15 47°F 1022.2 hPa (-0.3)
PXSC1 22 mi48 min 54°F 46°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi48 min N 7 G 8.9 51°F 1020.7 hPa (-0.8)
OBXC1 24 mi48 min 50°F 46°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi48 min N 2.9 G 4.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi48 min N 4.1 G 5.1 49°F 1021.8 hPa (-0.6)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi48 min ESE 2.9 G 4.1 46°F 1022 hPa (-0.5)
AAMC1 - 9414750 - Alameda, CA 27 mi48 min Calm G 1 47°F 55°F1021.9 hPa (-0.5)
LNDC1 27 mi54 min ESE 1 G 1.9 48°F 1021.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi48 min NE 4.1 G 5.1 42°F 53°F1022.4 hPa (-0.3)42°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 35 mi38 min N 3.9 G 5.8 54°F 55°F1022.5 hPa50°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi48 min W 1.9 G 2.9 43°F 53°F1022.2 hPa (+0.0)
46214 - Point Reyes, CA (029) 39 mi78 min 58°F9 ft
SFXC1 - San Francisco Bay Reserve, CA 41 mi63 min NNE 1 30°F 1022 hPa30°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 43 mi58 min NNW 12 G 14 55°F 57°F8 ft1020.8 hPa (-0.7)
RTYC1 - 9414523 - Redwood City, CA 43 mi48 min Calm G 1.9 43°F 54°F1022 hPa (-0.7)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi48 min SE 1.9 G 1.9 44°F 1022.1 hPa (-0.3)

Wind History for Point Reyes, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA15 mi73 minN 010.00 miFair34°F32°F93%1022.3 hPa
Petaluma Municipal Airport, CA20 mi73 minN 010.00 miFair32°F32°F100%1022.3 hPa

Wind History from DVO (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmN3CalmSW6SE6SE4SE4SE5CalmSW4S7CalmCalmCalmCalmCalmCalmCalmN5
1 day agoS8SW7SW7S8SW8SW7S8S7S9S10S7S8S7S7S5W11CalmCalmCalmCalmS6NW3CalmCalm
2 days agoCalmCalmS4S8SW7S7S8S6S9S7SE8S7S8S8SW6SW6SW5S6SW6S5S7S7S66

Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Wed -- 01:56 AM PST     0.95 feet Low Tide
Wed -- 02:54 AM PST     Moonrise
Wed -- 07:18 AM PST     Sunrise
Wed -- 07:54 AM PST     4.27 feet High Tide
Wed -- 02:28 PM PST     Moonset
Wed -- 03:16 PM PST     0.29 feet Low Tide
Wed -- 04:52 PM PST     Sunset
Wed -- 09:00 PM PST     3.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.111.21.82.63.444.34.13.52.71.81.10.50.30.40.91.52.32.83.12.92.5

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Wed -- 02:27 AM PST     0.00 knots Slack
Wed -- 02:55 AM PST     Moonrise
Wed -- 05:33 AM PST     0.92 knots Max Flood
Wed -- 07:19 AM PST     Sunrise
Wed -- 08:24 AM PST     -0.00 knots Slack
Wed -- 11:39 AM PST     -1.15 knots Max Ebb
Wed -- 02:29 PM PST     Moonset
Wed -- 03:27 PM PST     0.00 knots Slack
Wed -- 04:53 PM PST     Sunset
Wed -- 06:31 PM PST     0.92 knots Max Flood
Wed -- 09:20 PM PST     -0.00 knots Slack
Wed -- 11:58 PM PST     -0.71 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.7-0.5-0.20.30.70.90.90.70.2-0.4-0.9-1.1-1.1-1-0.7-0.30.30.70.90.90.70.2-0.3-0.6

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 (5,6,7,8)
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Ground Weather Radar Station Sacramento, CA
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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.