Saturday, February23, 2019 L-36.com


Marine Weather and Tides
South 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 6:47AMSunset 5:58PM Saturday February 23, 2019 8:46 PM PST (04:46 UTC) Moonrise 10:56PMMoonset 9:37AM Illumination 77% Phase: Waning Gibbous; Moon at 19 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 The San Francisco Bay North Of The Bay Bridge- 755 Pm Pst Sat Feb 23 2019
Tonight..W winds up to 10 kt...becoming east after midnight.
Sun..S winds up to 10 kt.
Sun night..SW winds 5 to 15 kt. A slight chance of rain.
Mon..S winds 10 to 20 kt with afternoon gusts up to 25 kt. A chance of rain.
Mon night..S winds 15 to 25 kt with gusts up to 30 kt. Rain likely.
Tue..S winds 20 to 30 kt with gusts up to 40 kt. Rain.
Tue night..S winds 20 to 30 kt with gusts up to 40 kt. Rain.
Wed..S winds 5 to 15 kt. A chance of rain.
Thu..W winds 5 to 10 kt.
PZZ500 755 Pm Pst Sat Feb 23 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Surface high pressure over the offshore waters will weaken as it drifts southward tonight through early next week. A subtropical tap developing west and southwest of coastal california by early next week will focus rain, heavy at times, and gusty winds over the coastal waters and bays while a cold front settles southward from the gulf of alaska and pacific northwest. Winds will diminish behind a cold frontal passage by mid next week, drier conditions return by late next week.


7 Day Forecast for Marine Location Near South San Francisco, CA
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location: 37.65, -122.36     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 240023
afdmtr
area forecast discussion
national weather service san francisco bay area
423 pm pst Sat feb 23 2019

Synopsis Dry and seasonably cool conditions will prevail across
most of the region through the remainder of this weekend. The
exception may be the north bay where there is a chance of light
rain late tonight and on Sunday. A plume of moisture will bring
periods of moderate to heavy rain to the majority of the region
for the first half of next week, though the exact positioning of
the heaviest rains continues to vary. Another potentially wet
system may bring more rain to the region late next week and into
the following weekend.

Discussion As of 2:00 pm pst Saturday... Water vapor imagery
continues to show northwesterly flow aloft prevailing across
california this afternoon. There is plenty of moisture streaming
through this flow in the form of high clouds ahead of the next
system. As a result, skies are mostly cloudy this afternoon, with
temperatures running similar to this time yesterday. Temperatures
will still be cool tonight, but not quite as cold as things start
to moderate with the high clouds in place.

The upper level ridge of the pacific will keep restrict how
quickly the next pacific storm digs south over the next 24 to 36
hours. As a result, the front will stall tonight and during the
day on Sunday, focusing the main moisture plume along the oregon
and california border and the far northern california coast.

Current composite radar is already showing some light showers
mainly from CAPE mendocino northward. This trend will likely
continue tonight and into Sunday, with the heaviest rain
developing and remaining well to our north. That being said, a
few light rain showers sag south of point area later tonight or
during the day on Sunday.

Monday through Wednesday is the time period to watch for us, as
things will likely start to get interesting for the central coast
sometime Monday afternoon or evening. At this time, the 12z GFS is
still the fastest with moving the rain into and south of the bay
area proper during the Monday morning commute. Meanwhile, the 12z
nam, ecmwf, and canadian hold off rain any rain until at least the
midafternoon and more likely the evening commute.

That being said, our north bay counties and mountains will likely
see periods of moderate to heavy rain develop during the day on
Monday and continue through Wednesday. The models are still
disagreeing with where the heaviest rainfall will occur. Most are
focusing on areas north of the golden gate bridge up to the
mendocino coast. However, the GFS shows the north bay and bay area
getting hit rather harder. This is leading to low confidence in
the exact placement of the heaviest rainfall. However, believe
the north bay will likely see quite a bit of rainfall regardless.

For now, it is not out of the question that 3 to 5 inches of rain
with locally amounts upward of 7 inches will be possible, leading
to flooding and more landslides or debris flows.

The main take away though is a series of disturbances will move
along the stalled front between Monday and Wednesday, bringing
relatively persistent rains, with periods of moderate to heavy
rain possible. Areas from santa cruz county northward will likely
see a decent amount of rain, with the north bay seeing the most at
this time, if models continue to trend this way. These various
disturbances will also bring periods of gusty winds. Therefore,
expect rapid rises along area rivers, streams, and creeks to be
possible the first part of the work week. Trees and powerlines
will also likely fall, as the grounds remain saturated.

Although some residual passing showers will be possible on
Thursday and Friday, they will be our in between days, before
another potentially more potent system takes aim at the region for
the weekend. For now, this latter system looks like it could be
wetter than the first as it has a better tap to the tropics.

However, the models are moving it through the region much faster.

Therefore, if comparing to the current system, they might actually
have similar impacts. Regardless, this week of weather bears
watching, and we encourage everyone to prepare early and stay
weather aware. Palmer

Aviation As of 4:23 pm pst Saturday...VFR, mid and high clouds
continue to advance in over the CWA from the west. MVFR cloud
ceilings are likely over the north bay Sunday morning as a nearly
stationary east to west 850 mb elevated frontal boundary develops,
850 mb warm air advection could result in spotty briefly very
light precip vicinity ksts per recent NAM hrrr output.

A separate, nearly stationary 925 mb frontal boundary develops
nearby the monterey bay terminals Sunday morning which may be the
focus for MVFR ceilings possibly lowering to ifr; not advertised
in the monterey bay 00z TAF cycle as of yet, but will look into it
a bit more this evening and amend tafs as needed.

Vicinity of ksfo...VFR, westerly wind 10 to 15 knots until 04z
this evening, light wind tonight becoming SE Sunday morning. An
onshore wind near 10 knots resumes later Sunday.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals...VFR, w-nw winds near 10 knots diminishing
and becoming light SE wind by mid evening. SE wind Sunday morning
shifting back to onshore near 10 knots Sunday afternoon.VFR is
near high confidence through the evening, but confidence level in
cigs lowers late tonight and Sunday morning, as mentioned if a
lower level (925 mb level) front develops it may be the focus for
ceilings lowering from MVFR to ifr, will look into it a bit more
by 06z TAF cycle and of course amend tafs prior to this time as
needed.

Hydrology
A pacific storm may bring moderate to heavy rain to areas from
santa cruz county northward for Monday through Wednesday, that
will likely cause rapid rises along area streams, creeks, and
rivers, especially the russian river. An esf has been issued.

Marine As of 3:34 pm pst Saturday... Generally light west winds
will continue tonight. Winds will turn southerly on Sunday and
ramp up early in the week. Light to moderate northwest swell will
persist through the week.

Mtr watches warnings advisories
Tngt None.

Public forecast: palmer
aviation: canepa
marine: sims
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 9 mi47 min W 4.1 G 6
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi47 min WSW 7 G 12 51°F 1025 hPa (-0.0)
LNDC1 11 mi47 min W 4.1 G 6 52°F 1026 hPa (-0.0)
OBXC1 11 mi47 min 52°F 44°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 11 mi47 min W 6 G 9.9 51°F 1026.1 hPa (-0.0)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 11 mi47 min W 7 G 8
PXSC1 11 mi47 min 52°F 44°F
FTPC1 - 9414290 - San Francisco, CA 12 mi47 min W 4.1 G 6
RTYC1 - 9414523 - Redwood City, CA 13 mi47 min WNW 4.1 G 5.1 50°F 52°F1026.4 hPa (+0.0)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi48 min SW 7 49°F 1026 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi47 min 52°F 1026.3 hPa (+0.3)
RCMC1 - 9414863 - Richmond, CA 19 mi47 min WNW 4.1 G 5.1 52°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi37 min WNW 3.9 G 5.8 52°F 54°F1026.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi47 min NW 7 G 7 51°F 49°F1025.9 hPa (+0.5)39°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi47 min WNW 6 G 8 51°F 1025.9 hPa (+0.5)
UPBC1 30 mi47 min NW 8 G 9.9
PCOC1 - 9415144 - Port Chicago, CA 33 mi47 min S 6 G 8 51°F 49°F1025.7 hPa (+0.0)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 37 mi47 min NW 1 G 2.9 52°F 1025.4 hPa (+0.0)
PRYC1 - 9415020 - Point Reyes, CA 41 mi47 min 54°F1025.7 hPa (-0.0)
SFXC1 - San Francisco Bay Reserve, CA 42 mi62 min SW 1.9 48°F 1025 hPa39°F

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA2 mi51 minWSW 510.00 miMostly Cloudy50°F41°F71%1025.9 hPa
Oakland, Metro Oakland International Airport, CA8 mi54 minWSW 610.00 miMostly Cloudy52°F43°F72%1026.1 hPa
San Carlos Airport, CA10 mi1.8 hrsW 510.00 miMostly Cloudy52°F39°F62%1026.1 hPa
Hayward, Hayward Air Terminal, CA13 mi53 minN 010.00 miFair52°F39°F64%1026.9 hPa
Palo Alto Airport, CA17 mi60 minN 010.00 miMostly Cloudy0°F0°F%1026.4 hPa
Mountain View, Moffett Field, CA22 mi51 minN 010.00 miFair50°F42°F74%1026.5 hPa

Wind History from SFO (wind in knots)
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Last 24hrW9W5SW3S5S4S3SE4SE6CalmCalmSE3S4SE4E7E7W8W13W14W13W12W12W9W8W5
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Tide / Current Tables for Point San Bruno, San Francisco Bay, California
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Point San Bruno
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Sat -- 02:58 AM PST     7.11 feet High Tide
Sat -- 06:49 AM PST     Sunrise
Sat -- 09:25 AM PST     1.04 feet Low Tide
Sat -- 09:36 AM PST     Moonset
Sat -- 03:11 PM PST     6.25 feet High Tide
Sat -- 05:56 PM PST     Sunset
Sat -- 09:29 PM PST     1.07 feet Low Tide
Sat -- 10:56 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.95.56.77.16.75.74.32.81.71.11.223.24.65.76.26.15.34.12.81.71.11.21.9

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
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Sat -- 12:01 AM PST     1.09 knots Max Flood
Sat -- 03:15 AM PST     -0.01 knots Slack
Sat -- 06:18 AM PST     -1.19 knots Max Ebb
Sat -- 06:49 AM PST     Sunrise
Sat -- 09:30 AM PST     0.01 knots Slack
Sat -- 09:36 AM PST     Moonset
Sat -- 12:31 PM PST     0.96 knots Max Flood
Sat -- 03:44 PM PST     -0.00 knots Slack
Sat -- 05:56 PM PST     Sunset
Sat -- 06:40 PM PST     -1.02 knots Max Ebb
Sat -- 09:45 PM PST     0.01 knots Slack
Sat -- 10:56 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.110.60.1-0.4-0.9-1.2-1.1-0.8-0.30.20.70.90.90.70.4-0.1-0.6-1-1-0.8-0.40.10.5

Weather Map and Satellite Images
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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.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (23,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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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.