Tuesday, April25, 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 6:18AMSunset 7:57PM Tuesday April 25, 2017 9:36 AM PDT (16:36 UTC) Moonrise 5:09AMMoonset 6:15PM 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- 826 Am Pdt Tue Apr 25 2017
Today..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 7 to 9 ft at 10 seconds.
Tonight..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 5 to 6 ft at 10 seconds.
Wed..SW winds 10 kt. Wind waves 2 ft or less. W swell 4 to 5 ft at 11 seconds. Slight chance of showers in the morning.
Wed night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 6 to 8 ft at 13 seconds and southwest 3 ft at 16 seconds.
Thu..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 9 to 11 ft at 12 seconds.
Fri..NW winds 20 to 30 kt. Wind waves 3 to 5 ft. NW swell 9 to 11 ft.
Sat..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 7 to 9 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 5 to 7 ft with a dominant period of 11 seconds. Across the bar...combined seas 6 to 8 ft with a dominant period of 11 seconds. Maximum ebb current of 1.4 knots at 03:06 pm Tuesday and 1.8 knots at 03:24 am Wednesday.
PZZ500 826 Am Pdt Tue Apr 25 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to locally strong northerly winds will prevail as high pressure remains anchored off the coast. The strongest winds will likely occur Monterey bay southward along the immediate coast. Winds and seas will increase over all coastal waters on Wednesday as high pressure strengthens.

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 251538
afdmtr
area forecast discussion
national weather service san francisco bay area
838 am pdt Tue apr 25 2017

Synopsis Dry weather with comfortable temperatures can be
expected today. Another chance of rain, mainly over the north
bay, is slated for Wednesday, with dry and seasonably cool weather
expected elsewhere. Dry weather along with a warming trend is
forecast across the region from Thursday through the weekend as
high pressure builds in. Breezy conditions are likely from
Thursday and Friday, especially in the hills.

Discussion As of 08:37 am pdt Tuesday... A mix of Sun and
clouds across the region this morning as moisture continues to
advect inland ahead of an approaching system. Overall, should see
temperatures this afternoon near or slightly warmer than those
yesterday as any precipitation will likely stay north of the
region. However, can't rule out very light rain over the far
northern portions of the north bay through the day. Thus, will
keep the mention of precipitation across this area while the rest
of the region will remain dry. Have updated sky cover a bit to
reflect current trends with the greatest cloud cover likely across
the northern half of the region today while more Sun can be
expected across the central coast. Otherwise, the ongoing forecast
remains on track for the short-term. Please see previous forecast
discussion below for additional details.

Prev discussion As of 3:10 am pdt Tuesday... Showers moved
completely out of our CWA yesterday evening with mostly clear
skies now for most the area from sf southward. Satellite does show
higher clouds over the north bay. Temperatures will be a degree
or two warmer compared to yesterday -- mostly 60s to lower 70s.

Synoptically a system will move into the pac NW on Wednesday with
the far southern edge of moisture forecast to possibly go across
the north bay. Guidance has been trending slightly drier compared
to yesterday with a chunk of the models keeping virtually our
entire area now dry. Amounts will be minor -- less than a tenth
for most of the north bay with little to no accumulations
forecast for sf bay southward. In fact, totals may be close to
what we saw from the system on Monday.

A substantial change in the pattern will begin to take shape on
Thursday as a ridge of high pressure aloft beings to build toward
the coast. At the same time off to our east the flow will become
tighter and northerly as a system drops into the central conus
from canada. The amplification will continue to increase Friday
into Saturday as an upper low dives into the four corners region.

Winds will increase with breezy conditions likely Thursday into
Friday. Models have backed off a bit compared to previous runs, so
a little less concern for fire weather interests compared to 12
hours ago.

Closer to the surface a ridge of high pressure will move to our
region leading to warmer temperatures especially by the weekend.

Highs on Saturday and Sunday will be in the 70s to mid 80s for
most spots away from the coast. Should be enough of a sea breeze
to keep many beaches and locations right at the coast in the 60s
to lower 70s. Any rain chances will be well to our north.

The ridge will slowly advance to the coast and then flatten and
progress off to the east next work week. The storm track will stay
well to our north with warmer than normal temperatures likely.

Aviation As of 05:15 am pdt Tuesday... PredominatelyVFR after
some lower CIGS earlier in the night. Look for few-sct cloud decks
in the lower to upper levels today as moisture streams in from
the northwest aloft. Breezy northwest winds in favored valleys,
over higher terrain, and along the coast through the day today
with gusts 20-25kt possible. Low CIGS return tonight.

Vicinity of ksfo...VFR with breezy, occasionally gusting to 25 kt,
west winds today. Few-sct cloud decks through low to high levels
through the day... With increasing low clouds overnight tonight.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR. Afternoon sea breeze. Lower cigs
return tonight.

Marine As of 08:37 am pdt Tuesday... Moderate to locally strong
northerly winds will prevail as high pressure remains anchored off
the coast. The strongest winds will likely occur from monterey
bay southward along the immediate coast. Winds and seas will
increase over all coastal waters on Wednesday as high pressure
strengthens.

Mtr watches/warnings/advisories
Tday Sca... Pigeon pt to pt pinos 0-10 nm from 9 am
sca... Mry bay from 12 pm
sca... Pt pinos to pt piedras blancas 0-10 nm
public forecast: rgass
aviation: drp
marine: mm
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 13 mi49 min WNW 12 G 15 55°F 51°F1019.1 hPa
46237 - San Francisco Bar, CA (142) 15 mi67 min 56°F7 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi47 min NW 9.7 G 12 53°F 52°F6 ft1019.2 hPa (+1.3)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi55 min NNW 11 56°F 1018 hPa
RCMC1 - 9414863 - Richmond, CA 18 mi55 min WNW 5.1 G 6 56°F 57°F1018.5 hPa
FTPC1 - 9414290 - San Francisco, CA 19 mi55 min W 8 G 11 55°F 58°F1018.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi49 min W 1.9 G 4.1 58°F 1019 hPa
PXSC1 22 mi49 min 57°F 45°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi49 min W 2.9 G 6 57°F 1017.7 hPa
OBXC1 24 mi49 min 57°F 46°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi49 min W 7 G 8.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi49 min N 4.1 G 6 56°F 1018.7 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi49 min NW 8.9 G 11 56°F 1018.8 hPa
LNDC1 27 mi61 min WNW 4.1 G 5.1 57°F 1018.2 hPa
AAMC1 - 9414750 - Alameda, CA 27 mi49 min W 4.1 G 6 57°F 60°F1019.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi49 min WNW 12 G 15 55°F 58°F1018.9 hPa47°F
UPBC1 33 mi49 min WNW 15 G 17
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 35 mi37 min NW 16 G 18 54°F 53°F1019.6 hPa (+1.4)50°F
PCOC1 - 9415144 - Port Chicago, CA 38 mi49 min WSW 11 G 13 55°F 58°F1018.4 hPa
46214 - Point Reyes, CA (029) 39 mi37 min 56°F8 ft
SFXC1 - San Francisco Bay Reserve, CA 41 mi112 min W 6 54°F 1017 hPa47°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 43 mi47 min NW 9.7 G 12 55°F 56°F6 ft1019 hPa (+1.4)
RTYC1 - 9414523 - Redwood City, CA 43 mi49 min NW 9.9 G 12 57°F 63°F1018.2 hPa

Wind History for Point Reyes, CA
(wind in knots)    EDIT      (on/off)   Help
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NE2
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA15 mi42 minWNW 710.00 miFair57°F44°F63%1019 hPa
Petaluma Municipal Airport, CA20 mi62 minVar 510.00 mi54°F48°F82%1019 hPa

Wind History from DVO (wind in knots)
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Calm6NW10
1 day agoNW8
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W5SW4SW4S5SW4
2 days agoCalm5
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SE6W12W17
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Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Tue -- 05:54 AM PDT     -0.08 feet Low Tide
Tue -- 06:08 AM PDT     Moonrise
Tue -- 06:21 AM PDT     Sunrise
Tue -- 11:42 AM PDT     3.62 feet High Tide
Tue -- 05:56 PM PDT     0.47 feet Low Tide
Tue -- 07:14 PM PDT     Moonset
Tue -- 07:56 PM PDT     Sunset
Tue -- 11:37 PM PDT     4.29 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.93.32.51.50.60.1-0.10.311.92.83.53.63.32.71.91.20.60.50.81.62.63.54.2

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Tue -- 02:41 AM PDT     -1.46 knots Max Ebb
Tue -- 06:10 AM PDT     Moonrise
Tue -- 06:19 AM PDT     0.00 knots Slack
Tue -- 06:22 AM PDT     Sunrise
Tue -- 09:15 AM PDT     1.26 knots Max Flood
Tue -- 12:26 PM PDT     -0.00 knots Slack
Tue -- 03:05 PM PDT     -1.23 knots Max Ebb
Tue -- 06:28 PM PDT     0.00 knots Slack
Tue -- 07:16 PM PDT     Moonset
Tue -- 07:57 PM PDT     Sunset
Tue -- 09:22 PM PDT     1.17 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.2-0.9-1.4-1.4-1.2-0.8-0.20.411.21.20.80.3-0.4-1-1.2-1.1-0.7-0.30.30.81.11.10.8

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 (12,3,4,5)
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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.