Monday, March27, 2017 L-36.com


Marine Weather and Tides
Castro Valley, 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 6:57AMSunset 7:28PM Monday March 27, 2017 3:44 AM PDT (10:44 UTC) Moonrise 5:58AMMoonset 6:16PM 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 254 Am Pdt Mon Mar 27 2017
.small craft advisory in effect from noon pdt today through this evening...
Today..NW winds 10 to 20 kt increasing to 15 to 25 kt this afternoon.
Tonight..NW winds 15 to 25 kt in the evening decreasing to 5 to 15 kt after midnight.
Tue..NW winds 5 to 15 kt.
Tue night..W winds 10 to 20 kt.
Wed..W winds 10 kt...increasing to 10 to 20 kt.
Thu..NW winds 10 to 20 kt.
Fri..N winds 5 to 15 kt.
PZZ500 254 Am Pdt Mon Mar 27 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will increase this afternoon through at least Tuesday as a strong surface pressure gradient builds across the region. At the same time, a building northwest swell will pass through the waters. Typical gusty spring time northwest winds will continue at least through midweek and likely through Friday as the next weather system will likely increase the surface pressure gradient once again.

7 Day Forecast for Marine Location Near Castro Valley, CA
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location: 37.71, -122.07     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 270531
afdmtr
area forecast discussion
national weather service san francisco bay area
1031 pm pdt Sun mar 26 2017

Synopsis A cold front will move southeast across the bay area
and north central coast this evening and overnight. Rain with this
front will continue to spread southeastward tonight then gradually
taper off to showers Monday morning. Decreasing clouds Monday will
be followed by brisk afternoon and evening northwest winds. High
pressure will quickly build back over northern california Tuesday
and persist through late week resulting in dry weather and slightly
warmer than average temperatures for late march and early april.

Discussion As of 8:49 pm pdt Sunday... A cold front over the
eastern pacific will continue to press southeastward across the
bay area and north central coast this evening and overnight. Brief
mid level warm air advection mainly earlier today ahead of the
cold front will continue to quickly shift south-southeastward
parallel to the california coast and become replaced by cold air
advection later tonight into Monday morning. Rain with this front
will continue to spread southeastward as well then gradually taper
off to showers Monday morning. 850 mb temperatures lowering from
5c this evening to approx 0c-2c Monday sets the stage for a chilly
and brisk Monday despite a late march Sun angle. After this point
an upper level ridge will build in quickly bringing a quick turn
around to milder temperatures from Tuesday through late week.

Temperatures from Tuesday onward through late week and next
weekend will become slightly warmer than average for late march
and early april.

Aviation As of 10:31 pm pdt Sunday... For 06z tafs. Weak front
is now moving east of the area with -shra activity quickly winding
down. Winds are switching NW and drier air is filtering in.

Question is what will be left in terms of low clouds for the early
morning hours. Best guidance currently suggests any morning cigs
should quickly mix out with strong boundary layer winds and drying
airmass.

Vicinity of ksfo... Northwest winds have arrive and rain should now
be done for the night. MVFR CIGS forecast to mix out by 16z.

Medium confidence.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Showers quickly moving eastward.

Lingering boundary layer moisture and MVFR CIGS should mix out by
15-16z Monday.

Marine As of 9:00 pm pdt Sunday... Winds will continue to
switch to the northwest overnight as a weak cold front passes
through the waters. Northwest winds will increase Monday afternoon
through Tuesday as a strong surface pressure gradient sets up
across the region. At the same time a building northwest swell
will pass through the waters but become messy in the near shore
waters due to the strong winds. Typical gusty spring time
northwest winds will continue at least through midweek and likely
through Friday as the next weather system will likely increase the
surface pressure gradient once again.

Mtr watches/warnings/advisories
Tngt None.

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

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 13 mi45 min W 5.1 G 7 54°F 59°F1020.6 hPa (+0.8)
LNDC1 13 mi45 min NW 2.9 G 6 54°F 1020.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi45 min NW 2.9 G 5.1
OBXC1 16 mi45 min 55°F 46°F
RTYC1 - 9414523 - Redwood City, CA 16 mi45 min W 5.1 G 8.9 53°F 60°F1020 hPa (+0.7)
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi45 min NNW 4.1 G 5.1 54°F 1020.4 hPa
PXSC1 18 mi45 min 53°F 47°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi45 min WNW 7 G 8.9 54°F 1020.5 hPa (+1.1)
FTPC1 - 9414290 - San Francisco, CA 22 mi45 min WSW 7 G 9.9 53°F 56°F1020.7 hPa (+1.0)
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi45 min W 12 G 14 53°F 57°F1020.1 hPa (+1.2)50°F
RCMC1 - 9414863 - Richmond, CA 23 mi45 min NW 8.9 G 12 53°F 57°F1019.9 hPa (+0.9)
UPBC1 23 mi45 min WNW 13 G 16
PCOC1 - 9415144 - Port Chicago, CA 24 mi45 min W 13 G 18 53°F 56°F1019.6 hPa (+1.1)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 25 mi45 min W 12 G 16 53°F 1019.2 hPa (+0.8)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 26 mi45 min W 8 G 9.9 54°F 1019.8 hPa (+1.3)
46237 - San Francisco Bar, CA (142) 30 mi45 min 55°F6 ft
SFXC1 - San Francisco Bay Reserve, CA 34 mi60 min W 7 49°F 1019 hPa48°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 41 mi55 min NW 16 G 19 55°F 55°F6 ft1020.4 hPa (+1.1)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi55 min NNW 14 G 16 55°F 55°F6 ft1020.2 hPa (+0.6)

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hayward, Hayward Air Terminal, CA4 mi51 minWNW 710.00 miMostly Cloudy53°F44°F72%1021.2 hPa
Oakland, Metro Oakland International Airport, CA8 mi52 minWNW 1110.00 miA Few Clouds54°F48°F83%1020.4 hPa
Livermore, Livermore Municipal Airport, CA13 mi52 minWSW 810.00 miPartly Cloudy51°F46°F83%1019.6 hPa
San Carlos Airport, CA16 mi50 minWNW 310.00 miPartly Cloudy52°F46°F82%1020.7 hPa
San Francisco, San Francisco International Airport, CA17 mi49 minWNW 810.00 miMostly Cloudy52°F46°F83%1020.4 hPa
Concord, Buchanan Field, CA19 mi52 minSW 410.00 miA Few Clouds52°F46°F83%1018.6 hPa
Mountain View, Moffett Field, CA19 mi49 minWNW 310.00 miFair52°F48°F86%1021 hPa

Wind History from HWD (wind in knots)
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Last 24hrS5S4S4S3SE7SE5S6S5SE6S5S3S9S8
G17
CalmCalmSW9SW9SW11W13W11NW7W10NW9W7
1 day agoN3NW5NW3CalmCalmN33W7W10NW11W11W13W12W9W10W12W12W8W9W6W5NW6W4W4
2 days agoSE6SE5SE9SE9SE11SE14S10S13
G22
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SE14SE15
G19
S11S4SE5S5SE3SE4CalmCalmSE4SE4CalmCalmE4

Tide / Current Tables for Roberts Landing, 1.3 miles west of, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Roberts Landing
Click for Map
Mon -- 12:49 AM PDT     6.89 feet High Tide
Mon -- 06:58 AM PDT     Moonrise
Mon -- 07:01 AM PDT     Sunrise
Mon -- 07:04 AM PDT     0.97 feet Low Tide
Mon -- 12:50 PM PDT     7.11 feet High Tide
Mon -- 07:16 PM PDT     Moonset
Mon -- 07:20 PM PDT     0.28 feet Low Tide
Mon -- 07:27 PM PDT     Sunset
Mon -- 07:59 PM PDT     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.66.96.45.33.82.41.411.42.54.15.66.77.16.65.53.92.20.90.30.51.53.14.8

Tide / Current Tables for Oakland Airport SW, South San Francisco Bay, California Current
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Oakland Airport SW
Click for Map
Mon -- 12:37 AM PDT     -0.00 knots Slack
Mon -- 03:11 AM PDT     -0.82 knots Max Ebb
Mon -- 06:29 AM PDT     0.01 knots Slack
Mon -- 06:59 AM PDT     Moonrise
Mon -- 07:01 AM PDT     Sunrise
Mon -- 09:39 AM PDT     0.76 knots Max Flood
Mon -- 12:46 PM PDT     -0.00 knots Slack
Mon -- 03:30 PM PDT     -0.92 knots Max Ebb
Mon -- 06:51 PM PDT     0.00 knots Slack
Mon -- 07:17 PM PDT     Moonset
Mon -- 07:27 PM PDT     Sunset
Mon -- 07:59 PM PDT     New Moon
Mon -- 10:02 PM PDT     0.79 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.3-0.2-0.6-0.8-0.7-0.5-0.20.20.50.70.80.60.3-0.1-0.6-0.9-0.9-0.7-0.300.40.70.80.7

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 (6,6,7,8)
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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.