Tuesday, April25, 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 6:17AMSunset 7:56PM Tuesday April 25, 2017 5:39 AM PDT (12:39 UTC) Moonrise 5:08AMMoonset 6:14PM 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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PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 201 Am Pdt Tue Apr 25 2017
Today..W winds 10 kt...increasing to 10 to 20 kt in the afternoon.
Tonight..W winds 10 to 20 kt.
Wed..W winds 10 to 20 kt. Slight chance of showers in the morning.
Wed night..W winds 10 to 20 kt.
Thu..NW winds 5 to 15 kt.
Fri..NW winds 5 to 15 kt.
Sat..N winds 10 kt...becoming west.
PZZ500 201 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... High pressure off the coast will lead to breezy west to northwest winds with locally stronger winds along the big sur coast. Winds and seas will increase Wednesday night into Thursday as high pressure strengthens over the eastern pacific resulting in a tighter pressure gradient across the coastal waters.

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 251217
afdmtr
area forecast discussion
national weather service san francisco bay area
517 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 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 05:11 am pdt Tuesday... High pressure off the coast
will lead to breezy west to northwest winds with locally stronger
winds along the big sur coast. Winds and seas will increase
Wednesday night into Thursday as high pressure strengthens over
the eastern pacific resulting in a tighter pressure gradient
across the coastal waters.

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

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi88 min WSW 4.1 G 7 53°F 54°F1018 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi88 min W 9.9 G 14 54°F 1016.5 hPa
PXSC1 3 mi88 min 55°F 44°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi83 min N 5.1 54°F 1017 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi88 min NW 9.9 G 13 55°F 1017.7 hPa
OBXC1 6 mi88 min 55°F 45°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi88 min WNW 9.9 G 14
RCMC1 - 9414863 - Richmond, CA 7 mi88 min NW 14 G 18 54°F 58°F1016.9 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi88 min WNW 8 G 12 55°F 1017.7 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi88 min W 5.1 G 8 55°F 61°F1018.1 hPa
LNDC1 9 mi88 min WNW 5.1 G 8 56°F 1017.6 hPa
46237 - San Francisco Bar, CA (142) 11 mi100 min 53°F7 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi88 min WNW 8.9 G 12 54°F 1017.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi88 min W 12 G 16 55°F 59°F1017.5 hPa48°F
UPBC1 22 mi88 min WNW 14 G 17
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi110 min NW 14 G 18 53°F 53°F7 ft1017.9 hPa (-0.3)
RTYC1 - 9414523 - Redwood City, CA 25 mi88 min SSW 2.9 G 5.1 53°F 64°F1017.5 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi82 min W 12 G 16 54°F 58°F1017.2 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi88 min WNW 14 G 18 54°F 51°F1017.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi115 min WNW 8.9 51°F 1016 hPa47°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi110 min NW 14 G 16 55°F 56°F8 ft1018.2 hPa (+0.0)

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
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Last
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NW2
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G12
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G16
SW7
G12
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G13
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G12
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G14
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G11
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G11
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1 day
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W9
G15
W5
G9
W7
G11
W7
G12
W12
G17
W9
G14
W11
G20
W9
G14
W8
G17
W14
G20
W10
G18
W12
G21
W14
G20
W10
G15
SW5
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G12
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SW4
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G9
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G8
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G10
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G13
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G16
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G14
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W6
G13
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G12

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA15 mi1.7 hrsW 1610.00 miA Few Clouds52°F45°F77%1017.7 hPa
Oakland, Metro Oakland International Airport, CA15 mi1.8 hrsW 1310.00 miPartly Cloudy56°F46°F70%1017.7 hPa
Hayward, Hayward Air Terminal, CA21 mi1.8 hrsWNW 410.00 miFair54°F42°F64%1018.6 hPa
Half Moon Bay Airport, CA22 mi85 minNNW 78.00 miOvercast52°F48°F88%1018.6 hPa
Novato / Gnoss Field, CA23 mi85 minW 810.00 miOvercast55°F42°F63%1017.6 hPa
San Carlos Airport, CA23 mi85 minW 710.00 miMostly Cloudy54°F44°F72%1017.9 hPa
Concord, Buchanan Field, CA23 mi1.8 hrsW 710.00 miFair53°F45°F74%1015.9 hPa

Wind History from SFO (wind in knots)
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Last 24hrW7SW6S3SW7W12W15
G21
SW14W13
G19
W16
G20
W17W13W12W15W19W21
G25
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G29
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W18W21W20W12W12W16W17
1 day agoW12W13W14W12W13W15W21
G29
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G26
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G27
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G35
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G31
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G26
W23W18W13W11W8
2 days agoW4W4SE3CalmE3W8W13W15W18
G22
W14W14W16W20W17W11W19W7NW10
G16
NW16W14W12
G19
W17
G23
W14W17

Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Tue -- 05:35 AM PDT     -0.12 feet Low Tide
Tue -- 06:07 AM PDT     Moonrise
Tue -- 06:20 AM PDT     Sunrise
Tue -- 12:06 PM PDT     5.17 feet High Tide
Tue -- 05:36 PM PDT     0.78 feet Low Tide
Tue -- 07:13 PM PDT     Moonset
Tue -- 07:55 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.753.62.10.80-0.10.51.52.73.94.85.24.942.81.60.90.81.42.43.74.95.8

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Tue -- 12:49 AM PDT     -0.00 knots Slack
Tue -- 03:41 AM PDT     -2.92 knots Max Ebb
Tue -- 06:07 AM PDT     Moonrise
Tue -- 06:20 AM PDT     Sunrise
Tue -- 07:01 AM PDT     0.00 knots Slack
Tue -- 10:02 AM PDT     3.35 knots Max Flood
Tue -- 01:30 PM PDT     -0.00 knots Slack
Tue -- 04:05 PM PDT     -2.47 knots Max Ebb
Tue -- 07:10 PM PDT     0.01 knots Slack
Tue -- 07:13 PM PDT     Moonset
Tue -- 07:55 PM PDT     Sunset
Tue -- 10:09 PM PDT     3.12 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.3-0.2-1.7-2.7-2.9-2.3-1.3-01.62.93.432.20.8-0.7-1.9-2.5-2.1-1.3-0.21.22.53.12.9

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 (8,2,3,4)
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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.