Wednesday, January24, 2018 L-36.com


Marine Weather and Tides
Pleasanton, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 7:15AMSunset 5:23PM Tuesday January 23, 2018 9:26 PM PST (05:26 UTC) Moonrise 11:06AMMoonset 11:57PM Illumination 50% Phase: First Quarter Moon; Moon at 7 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- 857 Pm Pst Tue Jan 23 2018
.small craft advisory in effect from Wednesday morning through Wednesday evening...
Tonight..NE winds 5 kt.
Wed..SE winds 5 to 15 kt...becoming S 15 to 25 kt in the afternoon. Rain in the afternoon.
Wed night..SW winds 15 to 25 kt...becoming W 5 to 15 kt after midnight. Rain likely in the evening, then chance of showers after midnight.
Thu..SW winds 15 to 25 kt. Chance of showers.
Thu night..SW winds 10 to 20 kt. Chance of showers in the evening, then slight chance of showers after midnight.
Fri..W winds 10 kt.
Sat..NW winds 5 kt.
Sun..NE winds 5 kt.
PZZ500 857 Pm Pst Tue Jan 23 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... An approaching frontal system will approach tonight resulting in increasing southerly winds tonight and Wednesday. Winds will switch to westerly Wednesday night then decrease Thursday. Unstable air behind the front will produce a slight chance for Thunderstorms Wednesday night and Thursday.

7 Day Forecast for Marine Location Near Pleasanton, CA
   Hourly   EDIT   Help
location: 37.66, -121.89     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 240030
afdmtr
area forecast discussion
national weather service san francisco bay area
430 pm pst Tue jan 23 2018

Synopsis Dry and seasonable weather with increasing high clouds
for the remainder of the day. Next front arrives weds morning in
the north bay and then spreads rain southward later weds afternoon
into weds night for the bay area into the central coast. Steady
rain quickly turns to showers for Thursday. A round of more
organized showers is possible Thursday afternoon as the upper low
moves inland. Dry weather forecast Friday through the weekend and
into early next week.

Discussion As of 12:00 pm pst Tuesday... After starting the
day 5 to 20 degrees cooler than yesterday and with areas of patchy
dense fog-- dry conditions, seasonal temperatures, and increasing
high level clouds are anticipated for the remainder of the day.

These high clouds, generally at about 25000 ft, are arriving at
the leading edge of an air mass boundary which is set to pass
through the san francisco and monterey bay areas in the form of a
cold front through the day tomorrow.

Forecast models are in fair agreement regarding the timing and
strength of this storm system, with some minor discrepancies in
timing and precipitation accumulations. Generally speaking, the
forecast models anticipate the leading edge of precipitation to
move into the northern periphery of the north bay by or just after
sunrise tomorrow. The main rain band will then transition
southeastward and pass the golden gate, moving into the immediate
san francisco bay area, around or just after lunchtime. Next, the
storm system will arrive in the south bay santa cruz area by late
afternoon tomorrow before shifting farther southward into the
greater monterey bay region by tomorrow evening.

Forecast models generally agree that this system will be stronger
than the last storm system to move through the area Sunday night,
but that this system will still be on the weaker side of mid-
winter storm systems. Overall, sustained winds will be breezy with
brief stronger gusts ahead of and with the frontal passage. Winds
will peak at around 35mph over the highest peaks and some coastal
areas, while most areas will generally experience breezy winds in
the 10 to 20 mph range. Precipitation amounts range from
1.25-1.75", 0.66-1.00" in the north bay valleys, 0.33-0.66" for
the san francisco bay area, except lesser amounts in the south bay
due to rain shadowing (ie around .25-.33"), with .20-.40" in the
monterey bay area, and less than .20" in the southern salinas
valley pinnacles np area. Post frontal instability will bring some
light lingering rain showers and an isolated thunderstorm (mainly
offshore of the sonoma coast) on Thursday. We will continue to be
running below normal seasonal precipitation with the forecast
precipitation amounts. Here is where we stand as of midnight this
morning:
site since oct01 (seasonal) since jan01 (calendar)
obsrv normal %norm obsrv normal %norm
santa rosa 12.49 19.25 65 6.18 5.50 112
napa 6.04 10.69 57 3.01 3.37 89
concord 5.68 8.09 70 2.99 2.54 118
dt san francisco 7.99 12.02 66 4.70 3.18 148
sfo airport 7.51 10.36 72 4.46 3.00 149
oakland 7.52 10.60 71 4.30 3.29 131
hayward 4.77 8.82 54 2.76 2.53 109
livermore 4.80 7.92 61 2.81 2.34 120
san jose 4.27 7.27 59 2.70 2.18 124
moffett field 4.44 6.85 65 2.49 2.01 124
watsonville 5.57 10.42 53 3.32 3.20 104
monterey 6.11 7.80 78 4.13 2.65 156
santa cruz 8.33 15.08 55 5.33 4.20 127
weak ridging builds in behind tomorrow's storm system for Friday
through the weekend and into early next week, bringing dry
conditions, mild afternoons, and cold nights. Forecast models
bring a different low pressure into the area around Tuesday of
next week, however, the trajectory of this system means it will
most likely be dry and more of a wind producer, if anything, for
our area.

Aviation As of 4:30 pm pst Tuesday... A few stratocumulus
clouds this afternoon from residual low-level moisture. Next
system will bring increasing moisture Wednesday morning with lower
cigs into the sfo bay area after 15z. Timing of precip appears to
be after 20z for the sfo bay area. Southerly winds increase as
the front approaches after 20z with gusts to 25 kt.

Vicinity of ksfo...VFR through tonight becoming MVFR after 15z and
light rain after 19-20z. Light south to southeast wind overnight
increasing to 15-18 kt gusting to 25 kt after 20z.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals...VFR through Wednesday morning becoming
MVFR after 20z.

Marine As of 4:30 pm pst Tuesday... An approaching storm system
will approach tonight resulting in increasing southerly winds
tonight and Wednesday. Increasing winds will result in hazardous
conditions with steeper wind waves. The storm system will bring
rain to the region and thunderstorms to the northern waters.

Mtr watches warnings advisories
Tday None.

Public forecast: drp
aviation: W pi
marine: mm
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
RTYC1 - 9414523 - Redwood City, CA 20 mi38 min SSW 1.9 G 1.9 51°F 55°F1022.5 hPa
AAMC1 - 9414750 - Alameda, CA 23 mi38 min Calm G 0 53°F 55°F1022.1 hPa
LNDC1 23 mi38 min Calm G 0 53°F 1022 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 25 mi38 min NW 1.9 G 1.9
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 26 mi44 min SE 5.1 G 6 51°F 1022.1 hPa
OBXC1 26 mi38 min 53°F 51°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 26 mi38 min NW 1.9 G 2.9 52°F 1022.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 28 mi38 min NW 1.9 G 2.9 52°F 1021 hPa
PCOC1 - 9415144 - Port Chicago, CA 28 mi38 min E 1.9 G 1.9 49°F 52°F1022.1 hPa
PXSC1 29 mi38 min 53°F 51°F
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi38 min Calm G 1 49°F 52°F1022.3 hPa49°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 30 mi44 min WNW 2.9 G 4.1 52°F 1022.2 hPa
FTPC1 - 9414290 - San Francisco, CA 32 mi38 min SSW 1.9 G 2.9 50°F 53°F1022.3 hPa
RCMC1 - 9414863 - Richmond, CA 33 mi38 min NW 4.1 G 5.1 51°F 54°F1021.7 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 34 mi37 min W 1.9 51°F 1022 hPa (-1.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 34 mi44 min E 8.9 G 11 53°F 1021.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 38 mi101 min NNE 2.9 44°F 1022 hPa43°F
46237 - San Francisco Bar, CA (142) 40 mi56 min 54°F5 ft

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
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
Last
24hr
NE3
NW6
N4
W3
NW1
SE1
SW1
--
N2
NW4
SE2
E3
E4
E2
E2
NE2
N3
G6
N4
NW3
NW5
SW2
SE1
--
S2
1 day
ago
SE4
G8
SE4
E5
SE3
SE5
G10
SE5
G8
SE5
G8
SE4
G8
SE5
G9
SE6
G9
SE7
N2
E2
E1
NW7
G10
W8
NW11
W9
W10
NW5
W4
NW2
W4
W4
2 days
ago
SE2
W2
SE3
SE2
SE4
E2
E4
E5
G8
NE2
G6
E3
E2
E3
SW3
S3
S5
SE5
SE5
G8

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA5 mi33 minS 38.00 miFair48°F45°F89%1022 hPa
Hayward, Hayward Air Terminal, CA12 mi32 minNE 310.00 miFair50°F43°F77%1022.9 hPa
Palo Alto Airport, CA17 mi1.7 hrsN 010.00 miClear48°F46°F94%1022.3 hPa
Mountain View, Moffett Field, CA18 mi90 minN 010.00 miFair52°F48°F86%1022.5 hPa
Oakland, Metro Oakland International Airport, CA18 mi33 minN 010.00 miA Few Clouds49°F48°F97%1022.1 hPa
San Jose, San Jose International Airport, CA20 mi33 minN 010.00 miA Few Clouds53°F46°F80%1022.2 hPa
San Carlos Airport, CA21 mi39 minN 010.00 miClear50°F44°F82%1022.3 hPa
San Jose / Reid / Hillv, CA22 mi94 minN 010.00 miClear52°F46°F82%1021.7 hPa
Concord, Buchanan Field, CA24 mi33 minN 08.00 miFair49°F45°F86%1020.8 hPa

Wind History from LVK (wind in knots)
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
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
Last 24hrE5E3CalmNE3CalmCalmCalmCalmCalmCalmCalmCalmCalmNE6E6E5E5E6E5NE7NE7NE5CalmS3
1 day agoNE3CalmE3CalmCalmCalmSW3CalmSW3SW4W4W5W5SW4S8W9W9W4NE8E6E5E7E6Calm
2 days agoNE3CalmE4CalmCalmE3CalmCalmCalmCalmE4NE3CalmW43W6W7W7W5W3S3SE3CalmCalm

Tide / Current Tables for Mowry Slough, San Francisco Bay, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Mowry Slough
Click for Map
Wed -- 05:53 AM PST     8.18 feet High Tide
Wed -- 07:17 AM PST     Sunrise
Wed -- 11:40 AM PST     Moonrise
Wed -- 01:12 PM PST     1.68 feet Low Tide
Wed -- 02:20 PM PST     First Quarter
Wed -- 05:23 PM PST     Sunset
Wed -- 06:25 PM PST     6.52 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.323.356.67.88.27.86.95.64.12.921.723.14.45.76.46.45.94.93.82.7

Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Dumbarton Bridge
Click for Map
Wed -- 03:23 AM PST     1.44 knots Max Flood
Wed -- 07:08 AM PST     -0.00 knots Slack
Wed -- 07:17 AM PST     Sunrise
Wed -- 09:43 AM PST     -1.06 knots Max Ebb
Wed -- 11:40 AM PST     Moonrise
Wed -- 01:01 PM PST     0.00 knots Slack
Wed -- 02:20 PM PST     First Quarter
Wed -- 04:06 PM PST     1.20 knots Max Flood
Wed -- 05:23 PM PST     Sunset
Wed -- 07:53 PM PST     -0.00 knots Slack
Wed -- 10:02 PM PST     -0.72 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.61.11.41.41.10.60.1-0.5-1-1-0.8-0.4-00.511.21.10.80.4-0.1-0.5-0.7-0.6

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 (0,6,7,8)
      (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.