Monday, December10, 2018 L-36.com


Marine Weather and Tides
San Francisco, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:13AMSunset 4:52PM Monday December 10, 2018 12:48 AM PST (08:48 UTC) Moonrise 9:58AMMoonset 8:02PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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
PZZ531 San Francisco Bay South Of The Bay Bridge- 818 Pm Pst Sun Dec 9 2018
Tonight..E winds 5 to 10 kt. Slight chance of rain after midnight.
Mon..E winds 10 kt...becoming nw in the afternoon. Chance of showers in the morning.
Mon night..N winds 10 kt.
Tue..NW winds 10 kt.
Tue night..NW winds 5 to 15 kt.
Wed..NW winds 10 kt.
Thu..NE winds 5 to 10 kt.
Fri..S winds 5 to 10 kt...becoming nw. Chance of rain.
PZZ500 818 Pm Pst Sun Dec 9 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A cold front will drift southeastward over the coastal waters tonight and Monday. Northwest winds will increase in the wake of the frontal passage then diminish on Wednesday. Moderate northwest swell will continue before a larger northwest swell arrives towards the end of the coming work week.


7 Day Forecast for Marine Location Near San Francisco, CA
   Hourly   EDIT   Help
location: 37.81, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 100554
afdmtr
area forecast discussion
national weather service san francisco bay area
954 pm pst Sun dec 9 2018

Synopsis A weak front will likely bring light rain to portions
of the area tonight and Monday morning, primarily to the north
bay but also locally as far south and east as the east bay and
santa cruz county. Another weak system may bring light rain to
the far northern portion of our region around midweek. Otherwise,
dry and mild weather is forecast through Thursday night. There is
a potential for more substantial and widespread rainfall late in
the week and into next weekend.

Discussion As of 08:55 pm pst Sunday... A weak cold front
continues to approach northern california late this evening with
light rain reported at the sea ranch along coastal sonoma county
and points northward. Light rain will be possible over the far
northern portions of the north bay through the remainder of the
evening before spreading southward and inland overnight. The
latest forecast models are in good agreement in showing the
frontal system and associated precipitation dissipating as it
approaches the san francisco bay area around sunrise. Thus, only
expecting very light rainfall if any to occur south of the golden
gate bridge during the Monday morning commute. It is also looking
more likely that portions of the south bay and entire central
coast may see no measurable rainfall at all from this system. Have
adjusted the forecast accordingly. For additional details, please
see the previous forecast discussion below.

Prev discussion As of 1:45 pm pst Sunday... Visibilities
improved in the east bay valleys by late morning, but light fog
still lingers across portions of the north and east bay early this
afternoon. Fog will likely persist in these areas into tonight.

However, with increasing clouds and precipitation developing
overnight, it's unlikely dense fog will be a problem.

Widespread high clouds in advance of a weak pacific frontal system
continue to stream across our area. These clouds have resulted in
cooler temperatures today compared to yesterday. Satellite shows
that the approaching front is currently about 300 miles west of
san francisco. The models are in generally good agreement in
spreading light rain across the north bay overnight, with rain
then possibly reaching san francisco by sunrise Monday. The front
is then forecast to dissipate over the central portion of the sf
bay area on Monday morning. Therefore, rain is expected to be
spotty for areas south of the golden gate, and rain is very
unlikely south of santa cruz and san jose. The primary impact of
this weak weather system will be potential wet roadways during the
morning commute tomorrow, particularly across the north bay, san
francisco peninsula, and east bay. Monday afternoon is expected to
be dry except for a few lingering isolated showers. Rainfall
amounts with this system are forecast to be a quarter inch or
less, except potentially more for isolated spots in the north bay
mountains. This system will generate only light winds.

The models appear to be trending drier with the midweek system,
forecast to sweep quickly across far northern california on
Tuesday night. The tail end of a weak front may clip the far
northern fringes of our forecast area with some light rain on
Tuesday night. Otherwise, dry conditions will likely prevail
across our forecast area from Monday afternoon through Thursday.

Temperatures will be near seasonal averages.

Longer range models indicate better precipitation potential late
in the week and into next weekend when two systems are forecast to
bring more substantial and widespread rain to our region.

Aviation As of 9:54 pm pst Sunday... A cold front over the
northern coastal waters and northern sonoma county is crawling
along, slower than yesterday's models forecasted, at about 10 mph.

Patchy tule fog mostly persists inland, otherwise a mix of mainly
mid to high level clouds are advancing eastward over the area.

The 06z tafs advertise a chance of wet weather with the incoming
slowly moving cold front; some loss of confidence in the model
forecasts based on recent weather changes just in 24 hours. The
sub-tropical jet stream departs to the e-se tonight and early
Monday no longer waiting for the cold front. Rather, all models
agree a moderate to strong 500 mb vorticity trough will amplify as
it passes over the CWA Monday late morning and afternoon; showery
weather Monday with the cold front and perhaps a non-zero chance
of isolated deeper convection along the dry to moist mid-upper
level moisture gradient embedded in the amplifying 500 mb trough
if the near surface moisture can lift through lower level stability.

Satellite and radar data will be extra helpful to the forecast
process in the nearest term.

Vicinity of ksfo...VFR, light wind. Increasing clouds lowering
ceiling to MVFR and vcsh early Monday morning, tempo showers
14z-18z. Non-zero chance isolated convection could briefly ramp
up Monday while a 500 mb trough passes over the bay area.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR, light wind. Increasing clouds either
late tonight and or Monday as the pre-frontal environment becomes
more moist on southerly flow. Isolated showers Monday.

Marine As of 8:55 pm pst Sunday... A cold front will drift
southeastward over the coastal waters tonight and Monday.

Northwest winds will increase in the wake of the frontal passage
then diminish on Wednesday. Moderate northwest swell will continue
before a larger northwest swell arrives towards the end of the
coming work week.

Mtr watches warnings advisories
Tngt None.

Public forecast: rgass dykema
aviation marine: canepa
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
FTPC1 - 9414290 - San Francisco, CA 1 mi37 min N 12 G 13 50°F 56°F1024.6 hPa
PXSC1 2 mi37 min 52°F 51°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi31 min NNW 6 G 8 51°F 1023.4 hPa
OBXC1 5 mi31 min 51°F 50°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi37 min Calm G 1 50°F 1024.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi38 min NNW 9.9 50°F 1025 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi37 min NNE 1 G 1
RCMC1 - 9414863 - Richmond, CA 8 mi31 min 55°F
AAMC1 - 9414750 - Alameda, CA 8 mi37 min N 1.9 G 2.9 49°F 55°F1024.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi31 min N 5.1 G 8 50°F 1024.7 hPa
LNDC1 8 mi37 min NW 1.9 G 1.9 49°F 1024.4 hPa
46237 - San Francisco Bar, CA (142) 10 mi49 min 56°F7 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi31 min E 6 G 7 49°F 1024.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi29 min E 12 G 16 54°F 57°F1024.4 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi43 min E 2.9 G 4.1 48°F 53°F1025 hPa48°F
RTYC1 - 9414523 - Redwood City, CA 24 mi37 min WSW 4.1 G 4.1 47°F 56°F1025 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi37 min E 2.9 G 7 47°F 54°F1025.1 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi31 min N 1.9 G 1.9 56°F1023.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi31 min E 5.1 G 7 49°F 1024.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 35 mi64 min ENE 2.9 41°F 1025 hPa40°F

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
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
10
PM
11
PM
12
AM
Last
24hr
N9
N8
G11
N9
G12
N12
N12
N13
N13
G16
N13
G16
N15
G19
N13
N12
G15
N15
N13
G16
NE9
N11
G14
N13
N12
N11
G14
N11
N11
N10
N10
N9
G12
N11
G15
1 day
ago
N8
N8
N9
G12
N12
N12
N11
G14
N11
N10
N12
N11
N12
N13
N13
G16
N14
N11
N9
N8
G11
N8
N7
G12
NE5
G8
N10
N7
G10
N8
G11
2 days
ago
NE4
N7
NE6
NE7
N8
G11
N7
G11
NE7
NE6
N3
NE2
N4
SW1
S2
SW2
SW2
SW2
SE2
SW4
S3
NE5

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA14 mi1.9 hrsE 36.00 miFog/Mist50°F46°F86%1024.3 hPa
Oakland, Metro Oakland International Airport, CA14 mi56 minENE 47.00 miA Few Clouds45°F43°F93%1024.8 hPa
Hayward, Hayward Air Terminal, CA20 mi55 minNE 76.00 miFair with Haze48°F43°F83%1025.6 hPa
Half Moon Bay Airport, CA21 mi54 minN 310.00 miMostly Cloudy46°F42°F87%1024 hPa
San Carlos Airport, CA22 mi54 minN 04.00 miFog/Mist46°F44°F93%1024.7 hPa
Novato / Gnoss Field, CA24 mi74 minN 03.00 miFog/Mist48°F48°F100%1025.4 hPa
Concord, Buchanan Field, CA24 mi56 minE 33.00 miFog/Mist44°F39°F85%1023.8 hPa

Wind History from SFO (wind in knots)
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
10
PM
11
PM
12
AM
Last 24hrCalmCalmCalmCalmCalmS3S3CalmS3N7N6N5N3N5NE4NE3CalmE7E5E6E7SE3E3SW4
1 day agoCalmCalmS3CalmCalmNE5SE4S3SE3E3E3E3N4CalmCalmS3CalmCalmNE4CalmS3CalmCalmCalm
2 days agoSE3W5CalmCalmCalmW3CalmS3SW3CalmNE5NE5CalmN3NE3NW4W7W6W4CalmW7W5CalmCalm

Tide / Current Tables for San Francisco, California
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
San Francisco
Click for Map
Mon -- 02:19 AM PST     4.75 feet High Tide
Mon -- 06:51 AM PST     3.16 feet Low Tide
Mon -- 07:14 AM PST     Sunrise
Mon -- 09:57 AM PST     Moonrise
Mon -- 12:35 PM PST     5.62 feet High Tide
Mon -- 04:50 PM PST     Sunset
Mon -- 07:27 PM PST     -0.35 feet Low Tide
Mon -- 08:02 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
10
pm
11
pm
3.64.44.74.74.23.73.33.23.43.94.55.15.55.65.14.12.81.40.3-0.3-0.30.212

Tide / Current Tables for Golden Gate Bridge .8 mi E ., San Francisco Bay, California Current
   EDIT      (on/off)   Help   One Week of Data
Golden Gate Bridge .8 mi E .
Click for Map
Mon -- 12:20 AM PST     3.09 knots Max Flood
Mon -- 03:45 AM PST     -0.00 knots Slack
Mon -- 06:06 AM PST     -1.35 knots Max Ebb
Mon -- 07:14 AM PST     Sunrise
Mon -- 09:13 AM PST     0.00 knots Slack
Mon -- 09:57 AM PST     Moonrise
Mon -- 11:51 AM PST     1.79 knots Max Flood
Mon -- 02:29 PM PST     -0.00 knots Slack
Mon -- 04:50 PM PST     Sunset
Mon -- 06:10 PM PST     -2.98 knots Max Ebb
Mon -- 08:02 PM PST     Moonset
Mon -- 09:59 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
10
pm
11
pm
3.132.31.1-0.2-1-1.4-1.2-0.7-0.20.71.51.81.40.6-0.5-1.5-2.5-3-2.7-2-1.101.5

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
wmap_P
GOES Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (3,6,7,8)
      (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.