Tuesday, September17, 2019 L-36.com


Marine Weather and Tides
San Francisco, CA

Version 3.4
NOTICE
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:51AMSunset 7:16PM Tuesday September 17, 2019 2:37 PM PDT (21:37 UTC) Moonrise 8:24PMMoonset 9:00AM Illumination 86% Phase: Waning Gibbous; Moon at 18 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- 224 Pm Pdt Tue Sep 17 2019
Tonight..SW winds 5 to 15 kt. A chance of showers after midnight.
Wed..SW winds 5 to 15 kt. A chance of showers.
Wed night..W winds 5 to 15 kt.
Thu..W winds 5 to 15 kt.
Thu night..NW winds up to 10 kt.
Fri..W winds 5 to 15 kt.
Fri night..SW winds 5 to 10 kt.
Sat..W winds 5 to 15 kt.
Sun..W winds 10 to 20 kt with gusts up to 25 kt.
PZZ500 224 Pm Pdt Tue Sep 17 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to locally gusty west to northwest winds will prevail over the waters through the middle of the week. The strongest winds will be generally confined along and south of the coastal points, as well as through the coastal gaps and over the bays. A front will move through tonight and Wednesday bringing a slight chance of showers to the northern waters. Northwesterly winds will increase at the end of the week. Mixed seas will continue with a moderate period northwest swell and a light southerly swell.


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


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 172024
afdmtr
area forecast discussion
national weather service san francisco bay area
124 pm pdt Tue sep 17 2019

Synopsis A weather system approaching from the northwest will
bring isolated to scattered showers to northern california late
tonight and across the san francisco bay area early Wednesday.

Temperatures will remain slightly below seasonal averages as well
through Thursday. A warming trend is then forecast for Friday and
into the upcoming weekend as high pressure builds in from the
eastern pacific.

Discussion As of 01:23 pm pdt Tuesday... A mid upper level low
currently sliding down the british columbia coast is pushing a
frontal boundary into the pacific northwest. Meanwhile, mostly
sunny conditions and mild temperatures persist across the region
with temperatures generally in the 70s. Overnight, generally quiet
weather conditions will persist with the potential for a slight
increase in low-level clouds in advance of the approaching cold
front.

Light rain showers will be possible over the north bay late in
the night into early Wednesday morning as the cold front advances
southward. The boundary will then push across the san francisco
bay area around sunrise and during the morning commute with
isolated to scattered rain showers possible. However, the frontal
boundary will be weakening as it approaches the central coast with
lesser potential for showers south of santa cruz and santa clara
counties. With this said, for those that do see rain showers,
rainfall amounts will generally be around 0.10" of an inch or less
with isolated amounts upwards of 0.25" in the north bay mountains
and or coastal ranges. Cannot rule out a few sprinkles early in
the morning for monterey and san benito counties, yet widespread
measurable rainfall is unlikely. Other than wet roadways during
the Wednesday morning commute, impacts from this system will be
minimal with generally light northerly winds.

Dry conditions then develop by Wednesday afternoon and evening as
the front dissipates over the region. Temperatures will also
change little with this frontal passage with widespread 70s inland
to upper 60s coast. A gradual warming trend is then forecast for
late week in response to high pressure building over the eastern
pacific. As the ridge shifts toward the coast Friday and Saturday,
widespread 80s are likely inland with even a few of the warmer
inland locations reaching into the lower 90s.

In the extended, model differences result in lower confidence with
respect to the overall synoptic pattern and forecast weather
conditions. The GFS and ECMWF both show another mid upper level
trough dropping down the west coast early next week. However, the
ecmwf is much further inland over the great basin while the gfs
tracks the system closer to the coastline. Meanwhile, high
pressure will continue to dominate over the eastern pacific early
next week. Until we see a bit more convergence in the model
solutions, will not make many chances to the extended forecast
period. Thus, will maintain dry weather conditions and
temperatures near to slightly above seasonal averages.

Aviation As of 10:53 am pdt Tuesday... For 18z tafs. Clear
skies withVFR conditions this afternoon and evening. Another
early season cold front arrives overnight into early weds morning.

This will have impacts for weds am. Front to arrive north bay
before 12z and over the bay area terminals 12-15z. Showers will be
minimal with best chances ksts. However lowering of CIGS with
typical light southeast winds to likely impact sfo and oak 12-17z.

Wind speeds look light but runways may be wet as sprinkles light
showers drizzle occur with frontal passage. Rapid clearing and nw
winds after 18z weds.

Vicinity of ksfo...VFR through late tonight. Increasing cigs
expected overnight with possible MVFR conditions early tomorrow
morning. Southeast winds and possible wet runways to start the day
weds.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions through late tonight
before possible MVFR ifr CIGS develop over the peninsula by early
weds morning.

Marine As of 9:00 am pdt Tuesday... Light to locally gusty west
to northwest winds will prevail over the waters through the
middle of the week. The strongest winds will be generally confined
along and south of the coastal points, as well as through the
coastal gaps and over the bays. A front will move through Tuesday
night and Wednesday bringing a slight chance of showers to the
northern waters tonight and into Wednesday morning. Northwesterly
winds will increase at the end of the week. Mixed seas will
continue with a moderate period northwest swell and a light
southerly swell.

Mtr watches warnings advisories
Tngt Sca... Mry bay until 9 pm
sca... Pigeon pt to pt pinos 0-10 nm until 9 pm
sca... Pt pinos to pt piedras blancas 0-10 nm
public forecast: rgass
aviation: rww
marine: rowe
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 1 mi55 min WSW 8.9 G 15
PXSC1 2 mi79 min 71°F 52°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi49 min W 8 G 12 70°F 1016.7 hPa
OBXC1 5 mi55 min 67°F 55°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi50 min SSW 8.9 70°F 1017 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi55 min WNW 7 G 8.9 66°F 1017.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi55 min W 5.1 G 7
AAMC1 - 9414750 - Alameda, CA 8 mi55 min SW 5.1 G 6
LNDC1 8 mi49 min SW 7 G 9.9
PPXC1 - 9414847 - Richmond (Point Potrero), CA 8 mi49 min SW 14 G 18 65°F 1017.7 hPa
RCMC1 - 9414863 - Richmond, CA 8 mi49 min 65°F
46237 - San Francisco Bar, CA (142) 10 mi67 min 59°F4 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 19 mi49 min WNW 4.1 G 5.1 73°F 1016.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi37 min W 9.7 G 14 60°F 60°F1018.7 hPa (+0.0)
UPBC1 23 mi49 min WNW 11 G 14
MZXC1 - 9415102 - Martinez-Amorco CA 23 mi55 min WNW 12 G 15 72°F 71°F1016.8 hPa49°F
RTYC1 - 9414523 - Redwood City, CA 24 mi55 min NNW 11 G 13 71°F 73°F1018.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 27 mi55 min W 8.9 G 9.9 73°F 70°F1016.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi55 min 54°F1018.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi55 min NNW 8 G 8.9 73°F 1016.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 35 mi112 min WSW 5.1 76°F 1017 hPa53°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA14 mi1.7 hrsW 610.00 miA Few Clouds72°F53°F52%1017.8 hPa
San Francisco, San Francisco International Airport, CA14 mi1.7 hrsWNW 810.00 miA Few Clouds75°F48°F40%1017.6 hPa
Hayward, Hayward Air Terminal, CA20 mi1.7 hrsWNW 910.00 miFair72°F52°F50%1018.6 hPa
Half Moon Bay Airport, CA21 mi62 minNW 1010.00 miFair64°F55°F73%1018.6 hPa
San Carlos Airport, CA22 mi50 minNNW 810.00 miClear75°F51°F44%1017.6 hPa
Concord, Buchanan Field, CA24 mi1.7 hrsNNW 910.00 miFair77°F50°F39%1015.8 hPa
Novato / Gnoss Field, CA24 mi62 minSW 108.00 miFair79°F46°F32%1016.6 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hr--W12
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W4----------W8W8W7----SW5CalmE3NE4NE3E5W8W12
1 day agoW19
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------------SW9----SW7SW9------W10W14W18W20W18W11--
2 days agoW19W23W20
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W22--------------------W5----W11SW6--W14W16
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Tide / Current Tables for San Francisco, California
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San Francisco
Click for Map
Tue -- 02:02 AM PDT     4.96 feet High Tide
Tue -- 06:53 AM PDT     Sunrise
Tue -- 07:44 AM PDT     1.51 feet Low Tide
Tue -- 10:00 AM PDT     Moonset
Tue -- 02:14 PM PDT     5.41 feet High Tide
Tue -- 07:14 PM PDT     Sunset
Tue -- 08:17 PM PDT     1.21 feet Low Tide
Tue -- 09:23 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.14.754.74.13.12.21.61.51.92.63.54.355.45.34.63.62.51.61.21.31.82.5

Tide / Current Tables for Alcatraz Island S, San Francisco Bay, California Current
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Alcatraz Island S
Click for Map
Tue -- 12:39 AM PDT     1.48 knots Max Flood
Tue -- 03:37 AM PDT     -0.01 knots Slack
Tue -- 06:18 AM PDT     -1.99 knots Max Ebb
Tue -- 06:53 AM PDT     Sunrise
Tue -- 09:40 AM PDT     0.00 knots Slack
Tue -- 10:00 AM PDT     Moonset
Tue -- 12:51 PM PDT     1.39 knots Max Flood
Tue -- 03:40 PM PDT     -0.01 knots Slack
Tue -- 06:37 PM PDT     -2.25 knots Max Ebb
Tue -- 07:14 PM PDT     Sunset
Tue -- 09:23 PM PDT     Moonrise
Tue -- 10:11 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.51.10.5-0.4-1.4-2-1.8-1.2-0.50.20.81.31.41.10.5-0.3-1.3-2.1-2.2-1.7-0.9-0.10.5

Weather Map
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wmap_P
GEOS 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 (17,4,5,8)
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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.