Saturday, March25, 2017 L-36.com


Marine Weather and Tides
Belvedere, 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 7:02AMSunset 7:28PM Saturday March 25, 2017 4:39 AM PDT (11:39 UTC) Moonrise 4:45AMMoonset 4:05PM Illumination 5% Phase: Waning Crescent; Moon at 27 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 310 Am Pdt Sat Mar 25 2017
Today..NW winds 5 to 15 kt.
Tonight..W winds 5 to 15 kt.
Sun..S winds 10 kt. Slight chance of rain in the morning, then chance of rain in the afternoon.
Sun night..SW winds 5 to 15 kt. Rain likely in the evening, then showers likely after midnight.
Mon..NW winds 10 to 20 kt. Slight chance of showers in the morning.
Tue..NW winds 10 kt.
Wed..W winds 10 kt.
PZZ500 310 Am Pdt Sat Mar 25 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light winds and moderate seas will prevail across the waters through tonight, aside from south of pt sur and over northern Monterey bay where they are expected to moderately strengthen as the day progresses. Then on Sunday, winds over the northern waters will turn southerly and become somewhat stronger as a weak cold front approaches.

7 Day Forecast for Marine Location Near Belvedere, CA
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location: 37.83, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 250925
afdmtr
area forecast discussion
national weather service san francisco bay area
225 am pdt Sat mar 25 2017

Synopsis A few early morning showers can be expected today,
otherwise mostly dry through early Sunday. Rain chances will
return by Sunday afternoon and continue through Sunday night with
a few showers lingering into early Monday. Otherwise, dry and
mild weather is expected from Monday through the remainder of next
week.

Discussion As of 2:25 am pdt Saturday... Latest radar scans
continue to show light showers moving across monterey and san
benito counties, with another batch of showers forming just off
the san mateo county coast an moving to the east-southeast. Expect
this shower activity to gradually taper off as the system exits
to the east, with only a chance of showers into the morning. The
rest of the day should be mostly dry with highs in the upper 50s
to mid 60s.

The dry weather will persist into early Sunday. Then, a
relatively weak weather system is forecast to move across northern
california bringing more light rain to portions of the district
late Sunday and Sunday night. The 00z GFS brings rain into the
north bay counties by late afternoon, then down to northern
monterey county before midnight. The system is progged to quickly
move through to the east and be gone by dawn. The ECMWF lingers
precip over the southern counties a little longer into Monday, but
for the most part, most of Monday should be dry.

High pressure is then forecast to build in over the west by
Tuesday keeping the district dry through the remainder of the
forecast period. There is a slight possibility of a weak system
brushing extreme northern california by Wednesday night/early
Thursday that may bring a slight chance of precipitation, but for
now most of the rainfall should remain to the north.

Aviation As of 10:55 pm pdt Friday... Residual scattered showers
persist tonight especially over the north central coast. Local
ifr/lifr/vlifr tonight and Saturday morning as the surface to
lower levels remain quite moist. Drying in the mid-upper levels
tonight and Saturday support fog development especially if and
where lower clouds happen to partially clear.

A secondary slow moving and dry cool front slides SE across the bay
area Saturday evening. Preceding this front it's a low confidence
cloud cover forecast though due to a lack of near surface inversions
if there is cloud cover best guess would be that primarily MVFR/vfr
will prevail. Post frontal drier air intrusion should help keepVFR
going Saturday night and Sunday morning.

Vicinity of ksfo... MVFR/vfr. Wind light onshore tonight. 15-20 knots
onshore winds developing Saturday from 21z to 04z Sunday.

Sfo bridge approach... Same as ksfo.

Monterey bay terminals... Light southeast to south winds with showers
continuing most of tonight. MVFR/vfr except local ifr tonight.

Marine As of 10:37 pm pdt Friday... Expect light northwest winds
tonight in the wake of a cool frontal boundary. Southerly winds are
forecast to return Sunday as the next system approaches. Fresh short
period swells will make for choppy conditions over the coastal waters
through the weekend.

Mtr watches/warnings/advisories
Tday None.

Public forecast: sims
aviation: canepa
marine: canepa
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi51 min WNW 2.9 G 4.1 53°F 56°F1021.2 hPa
PXSC1 3 mi51 min 54°F 50°F
OBXC1 6 mi51 min 55°F 50°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi51 min N 9.9 G 12
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi51 min NNW 9.9 G 13 54°F 1021 hPa
RCMC1 - 9414863 - Richmond, CA 7 mi51 min NW 6 G 8.9 54°F 57°F1020.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi51 min NW 8 G 11 55°F 1021.2 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi51 min N 7 G 9.9 55°F 58°F1021.3 hPa
LNDC1 9 mi51 min NNW 4.1 G 6 54°F 1020.9 hPa
46237 - San Francisco Bar, CA (142) 11 mi69 min 56°F8 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi51 min NW 12 G 13 53°F 1020.8 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi51 min W 11 G 13 53°F 58°F1021.2 hPa53°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi49 min NW 9.7 G 12 54°F 55°F9 ft1021 hPa (-0.7)
UPBC1 22 mi51 min WNW 13 G 15
RTYC1 - 9414523 - Redwood City, CA 25 mi51 min WNW 7 G 8.9 54°F 59°F1020.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi51 min W 12 G 15 53°F 57°F1020.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi51 min WNW 5.1 G 6 54°F 56°F1021 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi51 min W 6 G 9.9 54°F 1020.6 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi114 min WNW 2.9 51°F 1021 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi49 min NW 9.7 G 14 55°F 55°F8 ft1020.6 hPa (-0.7)

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA15 mi43 minW 59.00 miOvercast53°F51°F93%1020.9 hPa
Oakland, Metro Oakland International Airport, CA15 mi46 minNNW 410.00 miOvercast55°F53°F93%1021 hPa
Hayward, Hayward Air Terminal, CA21 mi45 minN 310.00 miOvercast55°F48°F77%1021.6 hPa
Half Moon Bay Airport, CA22 mi44 minN 49.00 miOvercast50°F48°F94%1021 hPa
Novato / Gnoss Field, CA23 mi64 minN 010.00 miFair50°F48°F94%1021.3 hPa
San Carlos Airport, CA23 mi44 minNW 510.00 miOvercast54°F51°F94%1021 hPa
Concord, Buchanan Field, CA23 mi46 minW 410.00 miOvercast53°F51°F93%1019.6 hPa

Wind History from OAK (wind in knots)
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Last 24hrSE9E10SE11SE15
G23
SE18S19S18SE19SE22
G29
SE14SE14SE13SE10S6SE5N4CalmCalmE3SE5CalmN3NW7NW4
1 day agoNW4CalmCalmCalmCalmSW45W11W7W9W8W12W12W14W7W5SW5S5S7SE10SE9SE7SE8SE6
2 days agoNE3W10W12W10NW8W7NW7W7W11W15W18W18W19W18W20W19W17W14W10W16NW8NW8NW7N3

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Sat -- 04:34 AM PDT     1.86 feet Low Tide
Sat -- 05:45 AM PDT     Moonrise
Sat -- 07:05 AM PDT     Sunrise
Sat -- 10:35 AM PDT     5.54 feet High Tide
Sat -- 04:55 PM PDT     0.02 feet Low Tide
Sat -- 05:04 PM PDT     Moonset
Sat -- 07:26 PM PDT     Sunset
Sat -- 11:40 PM PDT     5.22 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.84.13.32.41.91.92.33.144.95.45.54.93.82.41.20.300.41.22.23.44.45.1

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Sat -- 12:21 AM PDT     -0.01 knots Slack
Sat -- 02:47 AM PDT     -1.83 knots Max Ebb
Sat -- 05:45 AM PDT     Moonrise
Sat -- 05:59 AM PDT     0.00 knots Slack
Sat -- 07:05 AM PDT     Sunrise
Sat -- 08:53 AM PDT     2.45 knots Max Flood
Sat -- 12:05 PM PDT     -0.00 knots Slack
Sat -- 03:00 PM PDT     -2.65 knots Max Ebb
Sat -- 05:04 PM PDT     Moonset
Sat -- 06:28 PM PDT     0.01 knots Slack
Sat -- 07:26 PM PDT     Sunset
Sat -- 09:30 PM PDT     3.03 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.5-0.8-1.6-1.8-1.5-0.901.32.22.52.11.40.1-1.2-2.3-2.7-2.3-1.6-0.60.82.22.932.4

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 (7,2,3,4)
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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.