Wednesday, April26, 2017 L-36.com


Marine Weather and Tides
Stinson Beach, 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 10:57 PM PDT (05:57 UTC) Moonrise 5:09AMMoonset 6:15PM Illumination 0% Phase: New Moon; Moon at 0 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- 851 Pm Pdt Tue Apr 25 2017
.small craft advisory in effect from late Wednesday night through Thursday afternoon...
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 5 to 15 kt. Wind waves 1 to 3 ft. W swell 4 to 6 ft at 11 seconds and southwest 3 ft at 17 seconds. Slight chance of showers through the day.
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. W swell 9 to 11 ft at 12 seconds.
Thu night..NW winds 20 to 30 kt. Wind waves 4 to 6 ft. W swell 7 to 9 ft at 11 seconds.
Fri..NW winds 20 to 30 kt. Wind waves 3 to 5 ft. W swell 9 to 11 ft.
Sat..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 7 to 9 ft.
Sun..NW winds 20 to 30 kt. Wind waves 3 to 5 ft. NW swell 8 to 10 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 4 to 6 ft with a dominant period of 10 seconds. Across the bar...combined seas 5 to 7 ft with a dominant period of 10 seconds. Maximum ebb current of 1.8 knots at 03:24 am Wednesday and 1.4 knots at 03:54 pm Wednesday.
PZZ500 851 Pm 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... Strong winds continue to impact the coastal waters south of Monterey bay this evening. Winds will increase across all waters beginning Wednesday night and continue into the end of the week as surface pressure gradients increase.

7 Day Forecast for Marine Location Near Stinson Beach CDP, 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 260405
afdmtr
area forecast discussion
national weather service san francisco bay area
905 pm pdt Tue apr 25 2017

Synopsis A weak system passes inland to the north dragging a cool
front southeastward through the bay area later Wednesday. This will
result in light rain mainly from the santa cruz mountains northward
Wednesday. A warming and drying trend will then get underway beginning
Thursday and likely continuing into the upcoming weekend as high
pressure builds over the eastern pacific. Breezy northerly winds are
also possible from Thursday into Friday, especially in the hills.

Discussion As of 9:05 pm pdt Tuesday... Temperatures are generally
a few to several degrees milder than they were this time last evening.

Cloud cover has been variable through the evening and winds are from
the west to northwest.

Cloud cover will increase tonight associated with an appreciable plume
of precipitable water tracking e-se across the eastern pacific and
entering the california coastal waters; values near 1.30 inches by
early Wednesday morning as forecast by the GFS model is fairly close
to oakland's april all-time maximum (1.36 inches) for all oakland
soundings in the period 1948-2014. A nearly stationary, strong and
closed mid-upper level high is centered over the pacific straddling
the 30n latitude between approx 130w and 150w longitude. We're located
under the eastern extent of this high while a zonal jet stream enters
the pacific northwest. If this much above normal amount of moisture
streaming over the pacific was coupled with moderate-strong dynamics
we'd most certainly be looking at an appreciably wet day coming up,
but this is not quite the case as the primary mechanism at work will
be a cool frontal boundary sweeping into the moist air enhancing upward
vertical motion and resulting in mainly light rain. The eastern extent
of the ridging currently developing over the bay area will be briefly
weakened by this cool frontal passage Wednesday. Gusty/breezy NW winds
develop Thursday-Friday. The pattern turns warmer and dry late this
week and weekend with steadily building 500 mb heights as the eastern
pacific ridge steadily moves toward norcal.

Prev discussion As of 01:20 pm pdt Tuesday... Deep moisture aloft
continues to advect inland across the region this afternoon and
has resulted in widespread mid/high level cloudiness. All of this
is in advance of a weak mid/upper level trough that will push
inland into the pacific northwest late tonight into Wednesday.

This system may bring some very light precipitation to the
northern portion of our region, mainly from the santa cruz
mountains northward early Wednesday morning. Cannot rule out some
lingering showers into the early afternoon from the east bay hills
down into the santa lucia mountains, yet chances for widespread
measurable rainfall remain minimal as this system lacks needed
mid/upper level support as it pushes inland to our north. With
this passing system, temperatures will be seasonably cool and
temperatures will range from the lower 06s coast to middle 60s
inland through Wednesday. Some of the warmer, interior locations
of the central coast may warm into the lower 70s.

A warming trend will then get underway by Thursday as dry conditions
return along with mostly sunny skies. As a stronger mid/upper level
low drops southward out of canada into the rockies and high pressure
develops offshore late in the week, temperatures will warm into the
70s inland. In addition, breezy to locally gusty winds will develop
due to the tightening pressure gradient from Thursday into Friday.

Further warming of the air mass aloft will result in lower 80s
during the afternoon hours this weekend while onshore winds near the
coast keep temperatures in the 60s to 70s.

Temperatures moderate slightly by early next week as the mid/upper
level ridge weakens as a system pushes inland into the pacific
northwest. With that said, the main storm track will remain well
north of the region and dry weather conditions are likely into the
beginning of may.

Aviation As of 4:45 pm pdt Tuesday... Mid and high clouds
continue to stream over the area this afternoon with some areas of
lower ceilings possible early this evening around ksfo. Expect
clouds to increase overnight and into Wednesday.VFR/MVFR
conditions through the period with -ra possible at ksts and vcsh
for bay area terminals on Wednesday.

Vicinity of ksfo... Webcams show increasing cumulus this afternoon
which prompted the tempo bkn016 group in the 00z TAF issuance for
the next few hours. Will monitor the observations and amend if
necessary. Breezy west winds will decrease within several hours
after sunset. The mid/high clouds will continue to increase
overnight and into Wednesday with opportunity for MVFR ceilings
after about 15z with showers in the vicinity. Confidence on timing
is low.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions this evening with breezy
onshore winds through sunset. Increasing clouds will likely bring
MVFR ceilings to terminals overnight or early Wednesday morning.

Marine As of 7:49 pm pdt Tuesday... High pressure off the west
coast continues to result in moderate to locally strong winds. The
strongest winds are associated with a coastal jet near the coast
from monterey bay southward. Winds and seas will increase over
all coastal waters Wednesday night as high pressure strengthens.

Mtr watches/warnings/advisories
Tngt Sca... Mry bay until 9 pm
sca... Pigeon pt to pt pinos 0-10 nm until 9 pm
sca... Pt pinos to pt piedras blancas 0-10 nm
public forecast: canepa
aviation: rowe
marine: mm
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 5 mi57 min 55°F5 ft
FTPC1 - 9414290 - San Francisco, CA 11 mi45 min SW 2.9 G 8 55°F 55°F1019.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 11 mi67 min NNW 3.9 G 5.8 53°F 53°F5 ft1019.8 hPa (+0.4)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi50 min E 1 58°F 1019 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi63 min WSW 6 G 9.9 57°F 1018.3 hPa
PXSC1 15 mi45 min 57°F 52°F
RCMC1 - 9414863 - Richmond, CA 15 mi45 min NW 8.9 G 13 58°F 58°F1019 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi45 min WNW 7 G 11 59°F 1019.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi45 min W 7 G 8.9
OBXC1 18 mi45 min 57°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi45 min W 6 G 7 57°F 1019.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 19 mi45 min WNW 5.1 G 6 56°F 52°F1019.5 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi45 min W 2.9 G 5.1 58°F 62°F1020 hPa
LNDC1 21 mi45 min W 2.9 G 5.1 58°F 1019.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi45 min WNW 7 G 11 58°F 1019.2 hPa
UPBC1 32 mi45 min WNW 9.9 G 13
MZXC1 - 9415102 - Martinez-Amorco CA 32 mi45 min WNW 8.9 G 9.9 58°F 60°F1019.5 hPa55°F
RTYC1 - 9414523 - Redwood City, CA 34 mi45 min W 4.1 G 5.1 58°F 64°F1019.5 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 35 mi67 min NW 5.8 G 7.8 56°F 56°F6 ft1019.7 hPa (-0.0)
PCOC1 - 9415144 - Port Chicago, CA 36 mi39 min W 16 G 19 58°F 59°F1018.7 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi72 min WNW 16 57°F 1018 hPa53°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 43 mi27 min NW 1.9 G 3.9 54°F 55°F1019.8 hPa54°F
46214 - Point Reyes, CA (029) 43 mi57 min 56°F6 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi45 min W 8.9 G 15 59°F 1018.4 hPa

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA21 mi62 minno data10.00 miMostly Cloudy57°F51°F82%1019.6 hPa
San Francisco, San Francisco International Airport, CA23 mi61 minW 710.00 miMostly Cloudy57°F51°F81%1019.6 hPa

Wind History from DVO (wind in knots)
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Tide / Current Tables for Bolinas Lagoon, California
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Bolinas Lagoon
Click for Map
Wed -- 05:18 AM PDT     New Moon
Wed -- 06:20 AM PDT     Sunrise
Wed -- 06:38 AM PDT     -0.42 feet Low Tide
Wed -- 06:48 AM PDT     Moonrise
Wed -- 12:36 PM PDT     3.63 feet High Tide
Wed -- 06:39 PM PDT     0.66 feet Low Tide
Wed -- 07:57 PM PDT     Sunset
Wed -- 08:26 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.33.93.12.110.2-0.3-0.40.1122.93.53.63.32.61.91.20.70.71.22.13.13.9

Tide / Current Tables for San Francisco Bay Entrance (Golden Gate), California Current
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San Francisco Bay Entrance (Golden Gate)
Click for Map
Wed -- 01:33 AM PDT     -0.00 knots Slack
Wed -- 04:36 AM PDT     -5.33 knots Max Ebb
Wed -- 05:18 AM PDT     New Moon
Wed -- 06:19 AM PDT     Sunrise
Wed -- 06:48 AM PDT     Moonrise
Wed -- 08:14 AM PDT     0.00 knots Slack
Wed -- 11:14 AM PDT     4.48 knots Max Flood
Wed -- 02:30 PM PDT     -0.01 knots Slack
Wed -- 05:04 PM PDT     -3.95 knots Max Ebb
Wed -- 07:56 PM PDT     Sunset
Wed -- 08:21 PM PDT     0.00 knots Slack
Wed -- 08:25 PM PDT     Moonset
Wed -- 11:15 PM PDT     3.79 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.91.2-1.1-3.4-5.1-5.2-4.2-2.6-0.51.73.64.44.231.1-1.2-3.1-3.9-3.4-2.2-0.61.22.93.7

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 (1,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, 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.