Wednesday, July17, 2019 L-36.com


Marine Weather and Tides
Lagunitas-Forest Knolls, CA

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6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 5:59AMSunset 8:32PM Wednesday July 17, 2019 1:19 AM PDT (08:19 UTC) Moonrise 8:24PMMoonset 5:39AM Illumination 100% Phase: Full Moon; Moon at 15 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 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 854 Pm Pdt Tue Jul 16 2019
.small craft advisory in effect until 3 am pdt Wednesday...
Tonight..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 8 to 9 ft. SWell sw around 3 ft at 17 seconds.
Wed..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 7 to 8 ft. SWell sw around 3 ft at 17 seconds.
Wed night..W winds 15 to 25 kt with gusts up to 30 kt. Wind waves 6 to 7 ft. SWell sw around 3 ft at 17 seconds.
Thu..SW winds 10 to 15 kt. Wind waves 5 to 6 ft. SWell sw around 3 ft at 16 seconds.
Thu night..SW winds 10 to 15 kt. Wind waves 4 to 5 ft.
Fri..S winds 10 to 15 kt. Wind waves 6 to 7 ft.
Fri night..SW winds around 5 kt. Wind waves 6 to 7 ft. Patchy fog.
Sat..SW winds 5 to 10 kt. Wind waves 5 to 6 ft. Patchy fog.
Sun..W winds 5 to 10 kt. Wind waves 5 to 6 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...southwest swell 3 to 4 ft with a dominant period of 17 seconds. Across the bar...southwest swell 4 to 5 ft with a dominant period of 17 seconds. Maximum ebb current of 3.1 kt at 05:25 am Wednesday and 1.7 kt at 06:13 pm Wednesday.
PZZ500 854 Pm Pdt Tue Jul 16 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty northwest winds continue across the waters. These winds will generate steep fresh swell resulting in hazardous seas conditions particularly for smaller vessels. Light long period southerly swell will continue through at least mid week.


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 170545
afdmtr
area forecast discussion
national weather service san francisco bay area
1045 pm pdt Tue jul 16 2019

Synopsis A gradual cooling trend is forecast through the end of
the work week. Slightly warmer weather will likely develop by the
end of the upcoming weekend, with more significant warming
expected next week.

Discussion As of 9:00 pm pdt Tuesday... Similar to yesterday,
marine layer clouds cleared from most coastal areas by late in the
afternoon. But latest satellite imagery reveals that low clouds
are rapidly redeveloping along the coast and locally into the
east bay.

A cooling trend that got underway in most locations today is
expected to continue through the remainder of the work week.

However, there may be little, if any, cooling tomorrow as the weak
shortwave trough currently located over northern california moves
off to our east and we see slight airmass warming over our area.

The cooling trend is then expected to redevelop on Thursday and
continue into Friday as an upper trough develops over the pacific
northwest and sags south into northern california. Inland areas
will experience the most cooling (5-10 degrees by Friday). Expect
night and morning low clouds to become more widespread by Thursday
morning and especially Friday morning.

The trough over the pacific northwest is forecast to lift to the
northeast by the time the weekend begins, but temperatures will
likely remain at least a few degrees cooler than seasonal averages
through Saturday, with slight warming then expected by Sunday. In
the longer range, the models agree that an upper ridge will build
across the western CONUS during the first half of next week,
resulting in a warming trend, especially inland.

Aviation As of 10:45 pm pdt Tuesday... Coastal stratus and fog
is increasing in coverage and extending over to the east bay.

Despite a relatively shallow marine layer depth stratus advected
by onshore winds have reached ksfo to koak and khwd. Outside of
locations in the east bay, the coastal north bay to san francisco
where winds remain gusty observations and the WRF model show a
general decrease in surface to lower level winds thus greatly
reducing the chances of any lingering low level wind shear (llws)
for the overnight. None of the 06z tafs advertise llws.

A mid latitude 500 mb trof passage late tonight and Wednesday
morning with a corresponding cyclonic circulation at the 925 mb
and 850 mb levels causes cooling and deepening of the marine
layer to focus mostly from the south bay to the north central
coast. Elsewhere 925 mb temperatures warm by a few degrees, which
should keep the marine layer depth either unchanged or compress it
a little. Best chance for marine based clouds and fog will be
along the coast over to the east bay and south bay southward along
the north central coast tonight and Wednesday morning,VFR to the
north and inland.

Sufficient mixing is forecast Wednesday to lift ceilings and
visibilities on the coast whileVFR continues inland. A weak
southerly wind reversal may develop along the north central coast
Wednesday. The 06z tafs wind forecasts mostly depart from
statistical guidance later in the forecast period based on
reasoning described above.

Vicinity of ksfo... West wind still gusting to near 25 knots.VFR
turned to MVFR ceiling due to advection of stratus by a west wind
earlier this evening. 06z TAF adjusted for recent change, but not
certain the stratus ceiling will hold all night as the marine
layer depth probably remains unchanged and the acv-sfo pressure
gradient is nearing 6 mb, a stronger northerly coastal wind could
end up drawing the stratus back to the ocean overnight. Thus ksfo
marginal MVFR ceiling with tendency towardVFR return Wednesday
morning probably early, but timing this is low confidence.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Stratus redeveloped a little quicker than
earlier forecast. Patchy drizzle could develop tonight.VFR returns
Wednesday morning with winds becoming southerly during the late
morning and afternoon.

Marine As of 8:54 pm pdt Tuesday... Gusty northwest winds
continue across the waters. These winds will generate steep fresh
swell resulting in hazardous seas conditions particularly for
smaller vessels. Light long period southerly swell will continue
through at least mid week.

Mtr watches warnings advisories
Tngt Sca... Mry bay until 3 am
sca... Pt reyes to pigeon pt 0-10 nm until 3 am
sca... Pigeon pt to pt pinos 0-10 nm until 3 am
sca... Pt pinos to pt piedras blancas 0-10 nm until 3 am
sca... Pt arena to pt reyes 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: dykema
aviation marine: canepa
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PRYC1 - 9415020 - Point Reyes, CA 13 mi50 min 53°F1011.7 hPa
46237 - San Francisco Bar, CA (142) 15 mi50 min 53°F5 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 16 mi40 min NW 12 G 14 55°F 53°F1012.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi69 min SSE 7 56°F 1012 hPa
RCMC1 - 9414863 - Richmond, CA 18 mi50 min 64°F
FTPC1 - 9414290 - San Francisco, CA 19 mi56 min SSW 6 G 9.9 55°F 57°F1012.2 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi50 min S 14 G 16 58°F 1012.3 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi50 min S 5.1 G 8.9 56°F 1011.3 hPa
OBXC1 24 mi50 min 58°F 58°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi56 min SSW 7 G 9.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 25 mi50 min SSW 6 G 8 58°F 1012.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi50 min SW 7 G 8.9 63°F 1010.8 hPa
AAMC1 - 9414750 - Alameda, CA 27 mi56 min SW 8.9 G 11 57°F 68°F1013.1 hPa
LNDC1 27 mi50 min SSW 8.9 G 12 58°F 1012.4 hPa
UPBC1 33 mi50 min WNW 1 G 2.9
MZXC1 - 9415102 - Martinez-Amorco CA 33 mi50 min Calm G 1.9 63°F 70°F1011.1 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 35 mi40 min WNW 23 G 27 50°F1010.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 38 mi50 min SSW 11 G 18 60°F 70°F1010.8 hPa
46214 - Point Reyes, CA (029) 39 mi50 min 52°F8 ft
SFXC1 - San Francisco Bay Reserve, CA 41 mi95 min W 6 62°F 1010 hPa54°F
RTYC1 - 9414523 - Redwood City, CA 43 mi50 min W 2.9 G 5.1 62°F 73°F1013.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi50 min WNW 6 G 8.9 68°F 1009.7 hPa

Wind History for Point Reyes, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA15 mi45 minN 010.00 miFair57°F53°F88%1011.5 hPa
Petaluma Municipal Airport, CA20 mi25 minN 010.00 miFair55°F55°F100%1011.5 hPa

Wind History from DVO (wind in knots)
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Last 24hrNE5NE4CalmNW4CalmCalmN4CalmCalm44SE9SW12
G19
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SE4E4CalmCalm
1 day agoCalmCalmNE5E4CalmNW3CalmCalmCalm3N5
G11
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Calm4CalmCalm
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmE4E64
G13
SE7E6
G11
SW9S9S9S8S13SE5NE3SE7CalmCalm

Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Wed -- 06:01 AM PDT     Sunrise
Wed -- 06:39 AM PDT     Moonset
Wed -- 07:20 AM PDT     -0.43 feet Low Tide
Wed -- 01:52 PM PDT     3.39 feet High Tide
Wed -- 07:11 PM PDT     1.78 feet Low Tide
Wed -- 08:31 PM PDT     Sunset
Wed -- 09:23 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.343.42.51.50.5-0.1-0.4-0.30.20.91.82.63.23.43.22.82.321.81.92.43.13.8

Tide / Current Tables for Point Reyes, California Current
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Point Reyes
Click for Map
Wed -- 12:34 AM PDT     -0.00 knots Slack
Wed -- 03:52 AM PDT     -1.47 knots Max Ebb
Wed -- 06:02 AM PDT     Sunrise
Wed -- 06:40 AM PDT     Moonset
Wed -- 07:51 AM PDT     0.00 knots Slack
Wed -- 10:59 AM PDT     1.16 knots Max Flood
Wed -- 02:13 PM PDT     -0.00 knots Slack
Wed -- 04:27 PM PDT     -0.67 knots Max Ebb
Wed -- 07:42 PM PDT     0.00 knots Slack
Wed -- 08:33 PM PDT     Sunset
Wed -- 09:25 PM PDT     Moonrise
Wed -- 10:27 PM PDT     0.79 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.3-0.3-0.9-1.3-1.5-1.3-1-0.50.10.711.210.70.1-0.4-0.6-0.6-0.5-0.30.10.50.80.8

Weather Map and Satellite Images
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wmap_P
GOES Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (4,6,7,8)
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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.