Sunday, May20, 2018 L-36.com


Marine Weather and Tides
South San Francisco, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 5:53AMSunset 8:18PM Sunday May 20, 2018 4:33 AM PDT (11:33 UTC) Moonrise 10:15AMMoonset 12:00AM Illumination 30% Phase: Waxing Crescent; Moon at 5 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 San Francisco Bay North Of The Bay Bridge- 236 Am Pdt Sun May 20 2018
.small craft advisory in effect from noon pdt today through this evening...
Today..SW winds 10 to 20 kt...increasing to 15 to 25 kt in the afternoon.
Tonight..SW winds 15 to 25 kt...decreasing to 10 to 20 kt by midnight.
Mon..S winds 5 to 15 kt...becoming sw 15 to 25 kt in the afternoon.
Mon night..SW winds 15 to 25 kt.
Tue..SW winds 5 to 15 kt.
Wed..SW winds 10 kt.
Thu..SW winds 5 to 15 kt.
PZZ500 236 Am Pdt Sun May 20 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A tight north to south pressure gradient along the california coast will continue to produce moderate to strong northwesterly winds across the coastal waters through Monday. As a result, steep wind waves will produce hazardous conditions for small crafts. A long period southerly swell will increase and mix with northwesterly swell by Monday morning, gradually increasing through much of the 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 200953
afdmtr
area forecast discussion
national weather service san francisco bay area
253 am pdt Sun may 20 2018

Synopsis A deep marine layer will allow for continued overnight
and morning clouds along the coast the next few days. Temperatures
will remain seasonably cool this week and into next weekend.

Discussion As of 2:53 am pdt Sunday... Infrared satellite
imagery reveals low clouds blanketing much of the san francisco
bay area and central california coast this early morning. An upper
level trough axis that has sagged over the california coast since
yesterday has allowed the marine layer to balloon in excess of
2,500 ft, according to the ft. Ord profiler. This upward trend in
the marine layer depth has also been captured in the oakland
soundings over the past day and a half. Locations that have been
spared from the overcast skies so far this early morning include
the north bay interior valleys, which has been the case for the
last few nights through this time. Temperatures are generally
running within a degree or two from what they were at this time on
Saturday morning. Breezy conditions have persisted past midnight
for parts of the region as a 2.8 mb onshore surface pressure
gradient has held from san francisco to sacramento. For example,
san francisco international airport continues to gust to 26 kt as
of 1:56 am pdt.

Synoptically, a longwave trough axis extends from the gulf of alaska
south through california. Over the next 24 hours, an upper low
will develop and drop south and set up residence over the
southern half of the state as a cut-off low for a few days. This
low will aid in reinforcing the cooler than normal conditions for
the san francisco bay area, and will likely allow for continued
overnight morning low clouds along the coastline. The best
convective potential over the next few days will remain outside
our county warning area in the sierra nevada, klamath mountains,
and the northern coastal range peaks from trinity to lake
counties. The 06z NAM does bring some minor surface-based
instability to extreme northern napa and sonoma counties on both
Monday and Tuesday afternoons, with the best potential looking to
be on Tuesday. With this in mind, did introduce a slight chance of
thunderstorms to these locations for Tuesday, closely aligning
with the latest storm prediction center's day 3 convective
outlook.

Models suggest the cut-off low will gradually lift northeast into
the great basin late Tuesday or Wednesday, and gradually fill
(weaken) in the process. There should be a brief period of weak
ridging aloft for Thursday before models advertise an another
approaching upper level low in the eastern pacific. The GFS lifts
the low's center north toward the oregon washington border by the
memorial day weekend, while the ECMWF takes a different track by
bringing the low onshore near point reyes. It's still 5-7 days
out, but if the low takes the southern route, this could bring an
increased chance of showers and possible convection to the area
for the holiday weekend.

Aviation As of 9:48 pm pdt Saturday... Onshore winds will usher
in additional stratus, MVFR ceilings tonight and Sunday morning.

A deepening marine layer should keep visibilities good overnight
and Sunday.

The uki-sts pressure gradient has steepened to 2.4 mb, twice as
strong as the 18z and 00z NAM forecasted for the present time, which
has resulted in a light n-ne wind in the last hour at ksts. Surface
ridging extending into mendocino county and a weakening surface low
pressure area moving south over colusa county is likely to be the
reason for the wind shift to n-ne direction. Light downsloping and
drying will likely delay low cloud development tonight at ksts, but
will leave tempo MVFR ceiling in the soon to be issued 06z taf.

Vicinity of ksfo... MVFR ceiling tonight, westerly wind diminishing
this evening.VFR forecast to return 20z Sunday with gusty westerly
wind redeveloping in the afternoon and evening.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ceilings becoming locally ifr later
this evening and overnight. MVFR ceilings Sunday with low clouds
possibly mixing out at times, onshore winds continuing through the
period.

Marine As of 2:42 am pdt Sunday... A tight north to south
pressure gradient along the california coast will continue to
produce moderate to strong northwesterly winds across the coastal
waters through Monday. As a result, steep wind waves will produce
hazardous conditions for small crafts. A long period southerly
swell will increase and mix with northwesterly swell by Monday
morning, gradually increasing through much of the week.

Mtr watches warnings advisories
Tday Sca... Sf bay from 12 pm
sca... Mry bay from 12 pm
sca... Pigeon pt to pt pinos 0-10 nm from 12 pm
sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
public forecast: rowe
aviation: canepa
marine: bam
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 9 mi52 min W 14 G 18 54°F 63°F1014.3 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi46 min W 8 G 14 53°F 1013 hPa
OBXC1 11 mi46 min 54°F 51°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 11 mi46 min W 12 G 21 53°F 1014 hPa
PXSC1 11 mi52 min 54°F 50°F
LNDC1 11 mi46 min W 9.9 G 15 54°F 1014 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 11 mi52 min W 15 G 20
FTPC1 - 9414290 - San Francisco, CA 12 mi52 min W 12 G 16 53°F 56°F1014.2 hPa
RTYC1 - 9414523 - Redwood City, CA 13 mi46 min WSW 8.9 G 15 55°F 65°F1015.7 hPa
46237 - San Francisco Bar, CA (142) 17 mi64 min 51°F4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 17 mi47 min SSW 1.9 53°F 1014 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi46 min NNE 1.9 G 2.9 55°F 1014 hPa
RCMC1 - 9414863 - Richmond, CA 19 mi52 min WNW 6 G 12 55°F 60°F1013.2 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 26 mi34 min WNW 16 G 19 53°F 51°F1015.1 hPa (-0.4)51°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi46 min WSW 8.9 G 13 55°F 1013 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi46 min WSW 8.9 G 15 55°F 63°F1013.4 hPa55°F
PCOC1 - 9415144 - Port Chicago, CA 33 mi46 min SW 13 G 19 54°F 64°F1013.1 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 34 mi44 min NW 16 G 21 54°F 53°F7 ft1015 hPa (-0.5)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 37 mi46 min WSW 11 G 16 55°F 1012.5 hPa
PRYC1 - 9415020 - Point Reyes, CA 41 mi46 min WNW 19 G 24 52°F1013.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 42 mi109 min W 11 51°F 1013 hPa49°F

Wind History for Alameda, CA
(wind in knots)    EDIT      (on/off)   Help
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SW3
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA2 mi38 minW 12 G 2110.00 miOvercast55°F46°F72%1014.6 hPa
Oakland, Metro Oakland International Airport, CA8 mi41 minW 19 G 2610.00 miOvercast and Breezy54°F48°F83%1014.4 hPa
San Carlos Airport, CA10 mi39 minWSW 510.00 miOvercast54°F46°F77%1015.2 hPa
Half Moon Bay Airport, CA12 mi39 minNW 13 G 1610.00 miOvercast54°F48°F82%1015.6 hPa
Hayward, Hayward Air Terminal, CA13 mi40 minW 1110.00 miOvercast54°F46°F77%1015.8 hPa
Mountain View, Moffett Field, CA22 mi38 minW 410.00 miOvercast55°F46°F74%1015.9 hPa

Wind History from SFO (wind in knots)
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Last 24hrW13
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1 day agoW8W9W8W8W10W12W12SW10W10W15W17W20W19
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2 days agoW12W11W14W12W10W12W10W12W17
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W9W10W13W11W9

Tide / Current Tables for Oyster Point Marina, San Francisco Bay, California
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Oyster Point Marina
Click for Map
Sun -- 12:47 AM PDT     Moonset
Sun -- 04:18 AM PDT     6.86 feet High Tide
Sun -- 05:55 AM PDT     Sunrise
Sun -- 11:15 AM PDT     Moonrise
Sun -- 11:27 AM PDT     -1.06 feet Low Tide
Sun -- 06:41 PM PDT     6.18 feet High Tide
Sun -- 08:16 PM PDT     Sunset
Sun -- 11:57 PM PDT     2.67 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.24.25.46.36.86.75.94.42.60.9-0.4-1-1-0.312.43.95.266.15.64.63.72.9

Tide / Current Tables for Oyster Point 2.8 mi E, South San Francisco Bay, California Current
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Oyster Point 2.8 mi E
Click for Map
Sun -- 12:46 AM PDT     Moonset
Sun -- 01:57 AM PDT     0.65 knots Max Flood
Sun -- 04:40 AM PDT     -0.00 knots Slack
Sun -- 05:55 AM PDT     Sunrise
Sun -- 08:38 AM PDT     -1.83 knots Max Ebb
Sun -- 11:15 AM PDT     Moonrise
Sun -- 12:00 PM PDT     0.01 knots Slack
Sun -- 03:15 PM PDT     1.07 knots Max Flood
Sun -- 06:51 PM PDT     -0.01 knots Slack
Sun -- 08:16 PM PDT     Sunset
Sun -- 09:31 PM PDT     -0.86 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.50.70.50.3-0.2-0.8-1.4-1.8-1.8-1.4-0.7-00.50.91.110.80.4-0.1-0.6-0.8-0.8-0.6

Weather Map and Satellite Images
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (7,2,3,4)
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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.