Sunday, March26, 2017 L-36.com


Marine Weather and Tides
Lagunitas-Forest Knolls, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:00AMSunset 7:29PM Sunday March 26, 2017 5:42 PM PDT (00:42 UTC) Moonrise 5:25AMMoonset 5:12PM Illumination 0% Phase: New Moon; Moon at 29 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- 234 Pm Pdt Sun Mar 26 2017
.small craft advisory in effect from Monday afternoon through late Monday night...
Tonight..SW winds 10 to 20 kt...becoming northwest after midnight. Wind waves 3 to 5 ft. W swell 6 to 7 ft at 12 seconds. Chance of rain in the evening, then slight chance of showers after midnight.
Mon..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. W swell 7 to 9 ft at 11 seconds.
Mon night..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. W swell 10 to 11 ft at 11 seconds.
Tue..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 8 to 10 ft at 11 seconds.
Tue night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 8 to 10 ft at 11 seconds.
Wed..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 7 to 9 ft. Slight chance of showers.
Thu..NW winds 20 to 30 kt. Wind waves 4 to 6 ft. W swell 7 to 9 ft.
Fri..NW winds 15 to 25 kt. Wind waves 4 to 6 ft. W swell 8 to 10 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 6 to 8 ft with a dominant swell period of 12 seconds. Across the bar...combined seas 6 to 9 ft with a dominant swell period of 12 seconds. Maximum ebb current of 1.6 knots at 2:30 pm Sunday and 1.3 knots at 3:12 am Monday.
PZZ500 234 Pm Pdt Sun Mar 26 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light southerly winds will veer to the northwest this evening as a front moves across the coastal waters. Light northwesterly winds will prevail tonight then increase Monday afternoon as high pressure builds in over the eastern pacific and a thermal trough develops over the state. A short period westerly swell is forecast to impact the region beginning Monday afternoon and is expected to continue building through Monday night. Choppy squared seas are forecast to persist through midweek as moderate to strong northwesterly winds prevail.

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 262049
afdmtr
area forecast discussion
national weather service san francisco bay area
149 pm pdt Sun mar 26 2017

Synopsis A weak weather system will spread light rainfall to
most of our region later the afternoon into the overnight hours.

Showers will mostly end by Monday morning. Expect decreasing
clouds on Monday with brisk afternoon and evening northwest winds.

High pressure will build back to our region and provide warmer
days on Tuesday and Wednesday along with fewer clouds. A system
will move to our east on Thursday and bring windier conditions
along with colder temperatures.

Discussion As of 2:00 pm pdt Sunday... Multiple minor updates to
the forecast today to try to get the timing down as a weak system
will move through later. This morning kmux was indicating
possible light rain, however no tips of the buckets were noted, so
now appears it was either just clouds or virga. Anyway, main band
of rain associated with the system is still forecast to go
through over the next 6 to 12 hours and bring light rainfall to
most parts of our cwa. Timing has it moving to the north bay late
this afternoon, to sf bay by early in the evening, and down to
monterey bay by mid-evening. Rain will switch over to showers
behind the front with precipitation possible overnight. Totals
still look like 1/4" to 1/2" for the north bay mountains, 1/10" to
1/4" for the rest of the north bay plus the sc mountains, with
less than .15" for the remainder of the cwa.

Breezy northwesterly winds can be expected on Monday as a ridge of
high pressure begins to build back into our region. Highest values
should be along the coast and coastal ranges. Winds will start to
abate by the evening as the gradient slackens. Tuesday and
Wednesday are shaping up to be quiet weather days with the ridge
in place. Temperatures will return to the 60s and 70s. A few lower
80s are not of out the question in monterey county on Wednesday.

The pattern will change again on Thursday as an inside slider
moves into the intermountain region. Biggest question for a few
days has been if the low will be far enough west to produce
showers or if it will stay more to the east. 12z operational and
ensemble forecasts are trending farther to the east and now favor
drier solutions. Still could be a few showers over the north bay
mountains and east bay hills, so those were kept in the forecast.

The bigger impact will be another round of cooler
temperatures(highs mostly upper 50s to upper 60s) along with
breezy conditions. 925 mb speeds off to the ECMWF are forecast to
be up to 40 kt at the coast. Those values will likely increase
with the higher resolution models as it gets closer.

The ridge will rebuild starting on Friday and should keep dry
weather through at least all of next weekend. Temperatures will
warm back into the 60s and 70s.

Aviation As of 10:52 am pdt Sunday... Increasing cloud cover
expected as the main frontal band approaches the region. A stray
shower cannot be ruled out ahead of the front however showers
associated with the front are not expected to arrive until later
this afternoon and evening. See tafs for detailed timing. Cigs
will begin to lower this afternoon and evening as the front moves
from north to south. Winds will increase slightly this evening with
moderate localized gusts possible.

Vicinity of ksfo...VFR. Light rain forecast to begin around 02z Sunday
evening with MVFR CIGS overnight.

Sfo bridge approach... Same as ksfo.

Monterey bay terminals...VFR. Light rain forecast to begin around
03z Sunday evening with MVFR CIGS overnight.

Marine As of 11:12 am pdt Sunday... Generally light winds and
moderate seas expected across the waters through most of today.

Northwest winds will increase over the waters by Monday as high
pressure builds over the eastern pacific.

Mtr watches/warnings/advisories
Tngt None.

Public forecast: bell
aviation: cw
marine: cw
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 15 mi42 min 56°F7 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi52 min S 19 G 23 55°F 56°F7 ft1017.7 hPa (-1.8)
RCMC1 - 9414863 - Richmond, CA 18 mi42 min SSW 5.1 G 8 59°F 57°F1017.4 hPa (-1.9)
FTPC1 - 9414290 - San Francisco, CA 19 mi42 min SSW 9.9 G 16 59°F 56°F1017.9 hPa (-1.8)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi42 min SSE 8 G 12 60°F 1017.9 hPa (-1.9)
PXSC1 22 mi42 min 61°F 48°F
OBXC1 24 mi42 min 59°F 51°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi42 min S 13 G 16
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi54 min S 8 G 11 61°F 1017.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi42 min SW 11 G 17 60°F 1017.1 hPa (-2.0)
AAMC1 - 9414750 - Alameda, CA 27 mi42 min SSW 13 G 14 59°F 59°F1018.3 hPa (-1.7)
LNDC1 27 mi48 min S 8 G 14 60°F 1017.7 hPa
UPBC1 33 mi42 min SSW 12 G 17
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi42 min SSW 9.9 G 15 60°F 57°F1017.7 hPa (-1.7)49°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 35 mi32 min S 19 G 23 55°F 55°F1017 hPa55°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi42 min SSW 6 G 8.9 61°F 57°F1017.3 hPa (-1.8)
46214 - Point Reyes, CA (029) 39 mi50 min 56°F8 ft
SFXC1 - San Francisco Bay Reserve, CA 41 mi57 min W 2.9 60°F 1018 hPa49°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 43 mi52 min SSE 16 G 19 55°F 55°F7 ft1017.8 hPa (-1.6)
RTYC1 - 9414523 - Redwood City, CA 43 mi42 min S 6 G 12 62°F 60°F1017.3 hPa (-1.7)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi42 min SW 5.1 G 8.9 61°F 1017.3 hPa (-1.9)

Wind History for Point Reyes, CA
(wind in knots)    EDIT      (on/off)   Help
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NW15

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA15 mi47 minSSW 13 G 186.00 miOvercast with Haze57°F51°F82%1017.6 hPa
Petaluma Municipal Airport, CA20 mi47 minSSE 410.00 miOvercast57°F50°F77%1018.3 hPa

Wind History from DVO (wind in knots)
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Last 24hrCalmCalmCalm4E4NE35CalmCalmCalmCalmCalmCalmCalmCalmCalmE3SE6SE10SE7
G13
S8S7SW11S16
G22
1 day agoS7SW4CalmCalmCalmCalmCalmCalmCalmCalmN5
G10
N7CalmN5CalmCalmCalm6SW5W4NW9W5
G12
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G16
2 days agoCalmCalmCalmSE4CalmCalmSE4SE3S6SE5SE10SE7SE12SE10SE6
G13
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SE7S9SW8SW13SW83SW6

Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Sun -- 05:33 AM PDT     0.83 feet Low Tide
Sun -- 06:24 AM PDT     Moonrise
Sun -- 07:04 AM PDT     Sunrise
Sun -- 11:00 AM PDT     3.97 feet High Tide
Sun -- 05:52 PM PDT     0.02 feet Low Tide
Sun -- 06:11 PM PDT     Moonset
Sun -- 07:28 PM PDT     Sunset
Sun -- 11:47 PM PDT     3.84 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.63.12.51.81.20.90.91.32.133.743.83.22.41.50.70.200.41.12.133.7

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Sun -- 02:28 AM PDT     -1.08 knots Max Ebb
Sun -- 05:56 AM PDT     0.00 knots Slack
Sun -- 06:25 AM PDT     Moonrise
Sun -- 07:05 AM PDT     Sunrise
Sun -- 08:48 AM PDT     1.05 knots Max Flood
Sun -- 11:48 AM PDT     -0.00 knots Slack
Sun -- 02:44 PM PDT     -1.38 knots Max Ebb
Sun -- 06:12 PM PDT     Moonset
Sun -- 06:23 PM PDT     0.00 knots Slack
Sun -- 07:30 PM PDT     Sunset
Sun -- 09:18 PM PDT     1.18 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.1-0.7-1-1-0.8-0.400.60.910.90.5-0.1-0.8-1.3-1.4-1.1-0.7-0.20.40.91.21.10.8

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 San Francisco/Monterey Bay Area, CA (20,4,5,8)
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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.