Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Stinson Beach, CA

Version 3.4
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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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Sunrise 6:29AMSunset 7:57PM Wednesday August 21, 2019 5:27 PM PDT (00:27 UTC) Moonrise 10:23PMMoonset 11:07AM Illumination 62% Phase: Waning Gibbous; Moon at 21 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- 243 Pm Pdt Wed Aug 21 2019
.small craft advisory in effect through late Thursday night...
Tonight..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 5 to 6 ft. W swell 4 to 6 ft at 12 seconds.
Thu..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 5 to 6 ft. W swell 7 to 9 ft at 11 seconds and sw around 2 ft at 20 seconds.
Thu night..W winds 15 to 20 kt. Wind waves 5 to 6 ft. W swell 4 to 6 ft at 12 seconds and sw around 2 ft at 18 seconds.
Fri..S winds 10 to 15 kt. W swell 5 to 7 ft at 10 seconds and sw around 2 ft at 18 seconds.
Fri night..S winds 5 to 10 kt. W swell 4 to 6 ft at 10 seconds and sw around 2 ft at 16 seconds.
Sat..S winds 5 to 10 kt. NW swell 3 to 5 ft at 10 seconds and sw around 2 ft at 16 seconds.
Sat night..SW winds around 5 kt. Wind waves 2 to 3 ft. W swell 2 to 3 ft at 13 seconds and sw around 2 ft at 15 seconds.
Sun..W winds 5 to 10 kt. Wind waves 3 to 4 ft. W swell 3 to 5 ft and sw around 2 ft.
Mon..SW winds 5 to 10 kt. Wind waves 3 to 4 ft. W swell 3 to 5 ft and sw around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 6 ft with a dominant period of 12 seconds. Across the bar...seas 5 to 7 ft with a dominant period of 12 seconds. Maximum ebb current of 2.1 kt at 09:07 pm Wednesday and 1.3 kt at 10:07 am Thursday.
PZZ500 243 Pm Pdt Wed Aug 21 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will increase across the coastal waters as high pressure builds over the eastern pacific and low pressure develops over central california. Locally gusty coastal jets are forecast south of point arena, pigeon point, and point sur that will create hazardous seas conditions for smaller vessels. Breezy afternoon and evening winds are also forecast over the san francisco bay as well as over the Monterey bay. Mixed seas will continue with shorter period northwest waves at around 8 to 10 seconds, a light longer period west swell, and a light southerly swell.


7 Day Forecast for Marine Location Near Stinson Beach, CA
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location: 37.85, -122.67     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 212339
afdmtr
area forecast discussion
national weather service san francisco bay area
439 pm pdt Wed aug 21 2019

Synopsis High pressure will stall offshore and gradually
strengthen over the course of the next several days. A wind shift
Friday will bring increased onshore flow and cooler temperatures
despite the building ridge. Weekend will be dry with seasonal
temperatures along the coast and somewhat above normal
temperatures inland. A tropical disturbance may bring elevated
moisture and energy over the region later next week.

Discussion As of 02:50 pm pdt Wednesday... California is split
between a cool, moist air mass to the north and warm, dry air mass
to the south. This cool, moist air mass to the north is being
driven by a low pressure trough primarily impacting british
columbia and the pacific northwest, however, the base of this
trough also has dug southward into northern california early this
afternoon in response to the trough axis beginning to move ashore.

Consequently, scattered high clouds arriving from the northwest
are beginning to increase, which may eventually begin to limit
temperatures across the north bay later this afternoon and
evening. Elsewhere, warmer, drier air is settling to the surface
under the broader ridge aloft. 850-500mb temperatures have risen
by roughly 4c over the last 24 hours while temperatures at the
surface are tangibly warmer (+3 to 14 degrees) than the same time
yesterday. The areas seeing the largest day over day temperature
changes so far this afternoon are primarily located in the inland
north and east bay valleys, with concord up 13 degrees (91 vs 78),
santa rosa up 14 degrees (91 vs 77), and livermore up 14 degrees
(91 vs 77). That said, the east bay should end the day warmer than
the north bay given the aforementioned increasing trough
influence through remainder of the day.

For tonight, the marine layer will be under stress by two
competing factors once again, similar to last night. Expect to
continue to see a compressed but existent marine layer over the
monterey bay and into the salinas valley. The bigger unknown is
how the marine layer will in the san francisco bay area following
the departure of the trough to the northeast by tomorrow morning
and a lot of it will come down to the timing of the troughs
departure. A weak marine stratus push into the sf bay would be
possible if the trough exits earlier in the night and a marine
inversion could form, otherwise, it is more likely to see
scattered clouds at variable levels in the low to mid levels
tomorrow morning.

Tomorrow will be similar to day but with less overall trough
influence -- fewer clouds, a compressed marine layer, and slightly
warmer temperatures inland, particularly for the extreme north
bay that will be under some cloud cover today.

Looking ahead, the retrograding ridge will conclude retrograding
westward and anchor itself just along the california baja
california coastline for the coming days. Once anchored, the ridge
is forecast to amplify along the pacific coastline through the
course of the upcoming week -- heralding in gradually increasing
pressure and temperatures a loft. Interestingly enough,
temperatures at the surface will not directly reflect what is
occurring in the atmosphere because of a forecast wind shift to
the southwest scheduled to occur Friday. These southwest winds
will advect in a cooler, moister marine air mass into the inland
on Friday, helping to ease the burden of the strengthen ridge
aloft.

For the weekend, high pressure along the coast will begin to build
onshore and dominate our regional weather. Consequently, dry
weather is expected through the weekend with seasonal
temperatures near the coast and above average (generally 3-10
degrees) temperatures forecast for the inland areas.

Gfs and euro continue to track the potential development of a
tropical disturbance off the southern coast of mexico over the
next few days. Both models suggest the tropical disturbance will
form and begin a northwestward trajectory up offshore of the baja
coastline through this weekend, before falling apart in the less
favorable environment (cooler water) near the calmex border early
next week. Several GFS euro ensemble members split the surface low
from the upper level moisture instability through early next week
and bring into california by mid to late next week. This could
potentially introduce the chance for elevated convection and a
muggier atmosphere if it pans out. Forecast models are likely to
struggle to pin down the specifics of this system until it
eventually forms into a disturbance and falls apart late this
weekend early next weekend. Once this has occurred, there will be
fewer unknowns and we may have a better shot of identifying the
true trajectory of this mid to upper level energy moisture, so
stay tuned!

Aviation As of 4:37 pm pdt Wednesday... Dry northerly flow has
lowered humidities over the area and skies are clear except for
some high clouds. Marine layer has reformed very shallow and not
surprisingly the low clouds are offshore.VFR conditions are
expected in the sfo bay area tonight with CIGS over mry and sns a
little later than usual.

Vicinity of ksfo...VFR. West winds 20 kt gusting to 30 kt
decreasing after 04z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Clouds are still offshore so it will take
some time to develop over mry and sns. Ifr CIGS expected after
06z at mry and 10z at sns after 10z.

Marine As of 04:24 pm pdt Wednesday... Northwest winds will
increase across the coastal waters as high pressure builds over
the eastern pacific and low pressure develops over central
california. Locally gusty coastal jets are forecast south of
point arena, pigeon point, and point sur that will create
hazardous seas conditions for smaller vessels. Breezy afternoon
and evening winds are also forecast over the san francisco bay as
well as over the monterey bay. Mixed seas will continue with
shorter period northwest waves at around 8 to 10 seconds, a light
longer period west swell, and a light southerly swell.

Mtr watches warnings advisories
Tngt Sca... Pigeon pt to pt pinos 0-10 nm until 4 am
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Sf bay until 9 pm
sca... Mry bay until 9 pm
public forecast: drp
aviation: W pi
marine: sims
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 5 mi57 min 62°F4 ft
FTPC1 - 9414290 - San Francisco, CA 11 mi63 min WSW 12 G 19 68°F 62°F1012.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 11 mi37 min NW 14 G 18 62°F 60°F5 ft1013.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi136 min SSE 1.9 76°F 1013 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi57 min WSW 5.1 G 13 75°F 1011.3 hPa
RCMC1 - 9414863 - Richmond, CA 15 mi57 min 68°F
PXSC1 15 mi63 min 74°F 62°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi57 min SSW 7 G 11 69°F 1012.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi57 min W 2.9 G 8.9
OBXC1 18 mi57 min 72°F 63°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi57 min W 8.9 G 13 73°F 1012.1 hPa
PRYC1 - 9415020 - Point Reyes, CA 19 mi57 min 60°F1013 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi63 min W 5.1 G 9.9 74°F 71°F1012.8 hPa
LNDC1 21 mi57 min WSW 8.9 G 12 75°F 1012.2 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi57 min WSW 12 G 15 78°F 1011 hPa
UPBC1 32 mi57 min W 15 G 19
MZXC1 - 9415102 - Martinez-Amorco CA 32 mi57 min W 14 G 16 85°F 72°F1010.9 hPa
RTYC1 - 9414523 - Redwood City, CA 34 mi57 min W 14 G 19 80°F 74°F1012.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 36 mi57 min WSW 11 G 15 84°F 72°F1010.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi102 min W 11 90°F 1011 hPa57°F
46214 - Point Reyes, CA (029) 43 mi57 min 56°F6 ft
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 43 mi37 min WNW 19 G 25 55°F5 ft1012.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi57 min NW 12 G 15 84°F 1010.2 hPa

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA21 mi52 minWSW 8 G 1510.00 miFair90°F59°F36%1010.8 hPa
San Francisco, San Francisco International Airport, CA23 mi91 minW 20 G 2810.00 miPartly Cloudy and Breezy77°F59°F54%1012.6 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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Last 24hr5Calm------Calm--CalmCalmCalmCalmCalmCalmCalmCalmCalm34N9SW7W9
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1 day agoSW12SW8----NE5CalmCalmCalm--Calm--CalmN4N6N5CalmSW12SW9
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2 days agoSW5
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N7------N4CalmCalmCalmCalmCalmN3CalmCalmCalm4CalmCalm3SE5E8
G13
E85NE8

Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
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Wed -- 03:36 AM PDT     3.06 feet High Tide
Wed -- 06:31 AM PDT     Sunrise
Wed -- 10:11 AM PDT     1.05 feet Low Tide
Wed -- 12:07 PM PDT     Moonset
Wed -- 04:08 PM PDT     3.74 feet High Tide
Wed -- 07:55 PM PDT     Sunset
Wed -- 11:15 PM PDT     1.06 feet Low Tide
Wed -- 11:22 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.62.22.7332.92.521.61.21.11.21.62.22.93.53.73.63.32.82.21.61.21.1

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Wed -- 01:19 AM PDT     0.89 knots Max Flood
Wed -- 04:43 AM PDT     -0.00 knots Slack
Wed -- 06:30 AM PDT     Sunrise
Wed -- 07:29 AM PDT     -1.11 knots Max Ebb
Wed -- 10:19 AM PDT     0.00 knots Slack
Wed -- 12:06 PM PDT     Moonset
Wed -- 01:33 PM PDT     0.96 knots Max Flood
Wed -- 04:59 PM PDT     -0.00 knots Slack
Wed -- 07:55 PM PDT     Sunset
Wed -- 07:59 PM PDT     -1.29 knots Max Ebb
Wed -- 11:22 PM PDT     Moonrise
Wed -- 11:23 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.90.80.60.3-0.1-0.7-1.1-1-0.6-0.10.30.60.90.90.70.4-0-0.6-1.1-1.3-1.1-0.6-0.2

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 (20,4,5,8)
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Ground Weather Radar Station San Francisco Bay Area, 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.