Thursday, March23, 2017 L-36.com


Marine Weather and Tides
San Lorenzo, 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 7:03AMSunset 7:25PM Thursday March 23, 2017 3:31 AM PDT (10:31 UTC) Moonrise 3:24AMMoonset 2:00PM Illumination 18% Phase: Waning Crescent; Moon at 25 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
    EDIT      (on/off)   Help
PZZ530 San Pablo Bay Suisun Bay The West Delta And San Francisco Bay North Of The Bay Bridge- 243 Am Pdt Thu Mar 23 2017
.small craft advisory in effect from late tonight through Friday evening...
Today..W winds 5 to 15 kt.
Tonight..S winds 5 to 15 kt...increasing to 15 to 25 kt after midnight. Slight chance of rain in the evening, then chance of rain after midnight.
Fri..SE winds 15 to 25 kt. Rain.
Fri night..SE winds 10 to 20 kt. Rain likely in the evening, then slight chance of showers after midnight.
Sat..N winds 10 kt...becoming west.
Sun..SW winds 10 kt. Chance of showers, then showers likely.
Mon..W winds 10 kt. Slight chance of showers.
PZZ500 243 Am Pdt Thu Mar 23 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds will become southerly and increase this afternoon ahead of another storm system. Wind gusts may reach gale force at times late tonight and into Friday...especially for the northern coastal waters. Seas may be rough ahead of and just behind the storm system on Friday...but should decrease by Saturday morning. Winds will switch back to the northwest by Saturday morning. Another weak storm system is expected Sunday and may briefly switch winds out of the south. However...winds will quickly turn back to the northwest by Monday morning.

7 Day Forecast for Marine Location Near San Lorenzo, CA
   Hourly   EDIT   Help
location: 37.65, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 230518
afdmtr
area forecast discussion
national weather service san francisco bay area
1018 pm pdt Wed mar 22 2017

Synopsis Clearing and drying trend overnight through Thursday.

Widespread rainfall and stronger winds return to the northern
portion of the region late Thursday night and will spread
southward during the day Friday. Dry conditions return for most of
Saturday with another weather system forecast to push through
starting Sunday night into Monday.

Discussion As of 9:00 pm pdt Wednesday... As expected shower
activity quickly winding down as the Sun has set. Still a stray
shower or two on radar but those should end before midnight.

Thursday still looks on track to be our break day with some
sunshine and seasonably cool highs in the lower 60s.

00z NAM and GFS look on track with the next storm bringing rain
into the north bay about 24 hours from now. Then the front will
slowly shift southward Thursday night into Friday setting the
stage for a wet Friday morning commute. The rain wont reach the
central coast until Friday afternoon and evening but then drop
steady rains from the santa cruz mountains southward to the santa
lucia range of big sur as an upper wave and surface low develop
along the boundary and slow its southward progression. QPF numbers
remain on track as described below. Precip ends in the north bay
Friday night but showers linger from the golden gate southward
until about 12z Saturday.

Saturday looks to be a dry and cool day (not too different than we
are expecting for Thursday). Models have been hinting that the
next storm due to arrive late Sunday could be trending stronger as
well but the 00z GFS and ECMWF have not arrived. If the trends
hold true we'll see another cold and wet storm to wind out the
weekend and start the work week. The system looks cold with not as
much moisture as the Friday system. Behind that things should dry
out for a while.

Prev discussion As of 3:00 pm pdt Wednesday... Kmux radar shows
scattered showers continuing across our region -- especially for
the southern third of the cwa. Returns indicate a few moderate
cells so would expect a few are dropping small hail. Showers will
greatly diminish once the Sun GOES down, and additional
accumulations will mostly be under a tenth.

Dry weather will return for tonight through the majority of
Thursday before another system from the north moves through and
brings widespread rainfall back into the picture. Models have been
advertising this system for nearly a week and the latest guidance
has only slightly wavered from previous runs. Now looks like rain
will move into the north bay Thursday night, down to sf bay Friday
morning and to monterey bay starting around noon. However, the
main story will be the moderate to heavy band of rain associated
with a surface front that will go through later than the initial
round of rain. That band could produce high rain rates for a brief
period possibly leading to some urban and small stream issues. At
the same time southerly winds will be on the increase as the front
approaches. Gusts in many urban locations of 25 to 35 mph can be
expected. Values to 50 mph are possible above 1,500 feet. Guidance
has slightly trended downward so at this time do not expect to
issue wind advisories.

Rainfall amounts have only slightly changed from previous forecast
packages. Still looks that the best ivt numbers (and longest
duration) will focus on the north bay with widespread 1.5-3"
expected (locally 4+" for the north bay mountains). Similar values
can be expected for the sc mountains plus the santa lucias.

Around sf bay generally 2/3" to 1.5" is forecast with mostly less
than 2/3" from the santa clara valley southward.

Behind the front scattered showers are possible into early
Saturday. This will be followed quickly by another system that
will again move north-to-south late Saturday night through
Sunday. This feature will be the weakest of the week and rainfall
totals should be generally under 1/2" for most urban locations.

A ridge of high pressure will build behind that system and bring
warmer and drier conditions back to our region for most of next
week and possibly through the following week.

Aviation As of 10:30 pm pdt Wednesday... A fairly moist boundary
layer will allow scattered clouds to form overnight. Patchy MVFR cigs
possible through 16z.

Vicinity of ksfo...VFR. West winds 15-20 kt decreasing after 09z.

Sct020 12z-16z but cannot rule out a brief cig at bkn020.

Sfo bridge approach... Same as ksfo.

Monterey bay terminals... Low clouds over the hills will spill over
into mry and possibly sns through 15-16z.

Marine As of 08:50 pm pdt Wednesday... High pressure off the
southern california coast will weaken tonight resulting in
decreasing northwest winds. The winds will become southerly and
increase on Thursday a ahead of the next system. Winds will
increase during the day Thursday. Winds will switch to the
northwest Friday but another system may impact the waters on
Sunday.

Mtr watches/warnings/advisories
Tday Sca... Pt arena to pt reyes 0-10 nm until 3 am
sca... Pt reyes to pigeon pt 0-10 nm until 3 am
sca... Pigeon pt to pt pinos 0-10 nm until 3 am
sca... Pt arena to pigeon pt 10-60 nm until 3 am
gla... Pt arena to pigeon pt 10-60 nm from 9 am
sca... Pt pinos to pt piedras blancas 0-10 nm until 9 am
sca... Pt arena to pt reyes 0-10 nm from 3 pm
public forecast: rww
aviation: W pi
marine: W pi
visit us at

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 9 mi43 min NW 5.1 G 8.9 52°F 61°F1021.5 hPa
RTYC1 - 9414523 - Redwood City, CA 10 mi43 min WNW 9.9 G 11 52°F 59°F1020.8 hPa
LNDC1 11 mi43 min NNW 7 G 11 52°F 1021.1 hPa
OBXC1 12 mi43 min 53°F 44°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 12 mi43 min NW 8 G 11
OKXC1 - 9414776 - Oakland (Berth 34), CA 13 mi43 min NNW 8.9 G 12 53°F 1021.2 hPa
PXSC1 14 mi43 min 53°F 41°F
FTPC1 - 9414290 - San Francisco, CA 17 mi43 min W 9.9 G 14 52°F 57°F1021.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 19 mi43 min WNW 8 G 9.9 52°F 1021.3 hPa
RCMC1 - 9414863 - Richmond, CA 21 mi43 min NW 7 G 8.9 51°F 57°F1020.9 hPa
46237 - San Francisco Bar, CA (142) 24 mi61 min 55°F8 ft
UPBC1 27 mi43 min WNW 14 G 17
MZXC1 - 9415102 - Martinez-Amorco CA 27 mi43 min WNW 13 G 15 50°F 58°F1021 hPa47°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 28 mi43 min WNW 1.9 G 5.1 51°F 1020.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 30 mi43 min W 13 G 16 50°F 57°F1020.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 32 mi43 min W 8.9 G 12 50°F 1020.4 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi41 min NW 19 G 23 53°F 55°F9 ft1021.3 hPa (+0.6)
SFXC1 - San Francisco Bay Reserve, CA 39 mi106 min WNW 5.1 46°F 1020 hPa44°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi41 min NW 19 G 23 53°F 55°F9 ft1021.2 hPa (+0.3)
PRYC1 - 9415020 - Point Reyes, CA 47 mi43 min WNW 15 G 20 53°F 54°F1021.2 hPa

Wind History for Alameda, CA
(wind in knots)    EDIT      (on/off)   Help
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
Last
24hr
SE5
W5
G8
W4
G7
N7
W6
G9
NW3
W3
G6
NW5
W4
W7
G11
W7
G12
W9
G15
W10
G17
W8
G16
W9
G17
W12
G18
W11
G15
W9
G14
W7
G10
W6
G11
W9
G12
W5
W4
G7
W5
1 day
ago
SE14
G17
SE12
S10
G14
SE13
G19
S12
SW8
G11
W8
G11
W8
G12
SW10
G13
SW12
G15
SW10
G15
SW10
G14
SW11
SW12
G17
SW12
G15
SW12
G15
S13
SW10
G13
S7
S12
S11
G15
S16
G20
SW13
G20
SW8
2 days
ago
SW16
G20
SE16
S12
SE11
SE14
G17
SE18
SE19
G23
SE18
SE16
SE13
G16
SE16
SE17
SE11
G14
SE11
SE10
SE8
E4
G9
SE10
SE14
G18
SE17
G21
SE19
G23
SE17
G21
SE18

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA3 mi38 minNW 710.00 miA Few Clouds52°F43°F72%1021.1 hPa
Hayward, Hayward Air Terminal, CA5 mi37 minNNW 610.00 miFair50°F37°F63%1022.1 hPa
San Francisco, San Francisco International Airport, CA8 mi35 minW 13 G 1910.00 miA Few Clouds51°F44°F77%1021.3 hPa
San Carlos Airport, CA8 mi36 minWNW 710.00 miFair50°F44°F82%1021.7 hPa
Mountain View, Moffett Field, CA18 mi35 minW 410.00 miFair50°F44°F80%1021.7 hPa
Half Moon Bay Airport, CA18 mi36 minNNW 16 G 219.00 miOvercast52°F44°F77%1021.7 hPa
Livermore, Livermore Municipal Airport, CA21 mi38 minWSW 410.00 miMostly Cloudy47°F42°F83%1020.5 hPa

Wind History from OAK (wind in knots)
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
Last 24hrSE5NE3W10W12W10NW8W7NW7W7W11W15W18W18W19W18W20W19W17W14W10W16NW8NW8NW7
1 day agoSE12S11SE12S16S15SW10W11W11SW6SW13SW14SW12SW12SW13SW14SW15SW15S14S11
G20
S9S16S13SW16S9
2 days agoSW7S9S17SE7SE9SE10SE14
G21
SE14SE16SE14SE10SE11SE10E8SE11SE7SE11SE7SE9SE16SE14SE21S21S19

Tide / Current Tables for San Leandro Marina, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
San Leandro Marina
Click for Map
Thu -- 04:14 AM PDT     2.68 feet Low Tide
Thu -- 04:23 AM PDT     Moonrise
Thu -- 07:07 AM PDT     Sunrise
Thu -- 09:30 AM PDT     6.56 feet High Tide
Thu -- 03:00 PM PDT     Moonset
Thu -- 04:40 PM PDT     0.30 feet Low Tide
Thu -- 07:23 PM PDT     Sunset
Thu -- 11:20 PM PDT     5.99 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.34.63.732.72.93.64.75.76.56.564.93.62.21.10.40.30.91.93.14.45.45.9

Tide / Current Tables for Little Coyote Pt 3.4 mi NNE, South San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Little Coyote Pt 3.4 mi NNE
Click for Map
Thu -- 12:37 AM PDT     -0.40 knots Max Ebb
Thu -- 03:53 AM PDT     0.00 knots Slack
Thu -- 04:23 AM PDT     Moonrise
Thu -- 06:36 AM PDT     0.43 knots Max Flood
Thu -- 07:07 AM PDT     Sunrise
Thu -- 09:23 AM PDT     -0.00 knots Slack
Thu -- 12:48 PM PDT     -0.75 knots Max Ebb
Thu -- 03:00 PM PDT     Moonset
Thu -- 04:29 PM PDT     0.00 knots Slack
Thu -- 07:23 PM PDT     Sunset
Thu -- 07:33 PM PDT     0.64 knots Max Flood
Thu -- 10:40 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.4-0.4-0.3-0.200.30.40.40.30.1-0.2-0.5-0.7-0.7-0.6-0.5-0.20.20.50.60.60.50.2-0.1

Weather Map and Satellite Images
       (on/off)   Help
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)
      (on/off)   Help

Ground Weather Radar Station San Francisco Bay Area, CA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.