Saturday, January20, 2018 L-36.com


Marine Weather and Tides
Hercules, 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 7:19AMSunset 5:21PM Saturday January 20, 2018 6:21 PM PST (02:21 UTC) Moonrise 9:33AMMoonset 8:57PM Illumination 19% Phase: Waxing Crescent; Moon at 4 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- 202 Pm Pst Sat Jan 20 2018
.small craft advisory in effect from Sunday afternoon through late Sunday night...
Tonight..W winds 10 to 20 kt.
Sun..S winds 5 to 15 kt. Chance of rain in the afternoon.
Sun night..S winds 15 to 25 kt. Rain in the evening, then rain likely after midnight.
Mon..SW winds 10 to 20 kt. Chance of showers in the morning, then slight chance of showers in the afternoon.
Mon night..NE winds 5 to 15 kt.
Tue..NE winds 5 to 15 kt...becoming north 5 kt. Slight chance of rain.
Wed..E winds 5 kt...becoming sw 5 to 15 kt. Rain likely, then chance of showers.
Thu..W winds 5 to 15 kt. Chance of showers, then slight chance of showers.
PZZ500 202 Pm Pst Sat Jan 20 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Breezy northwest winds today as high pressure remains offshore. Winds will gradually taper off into tonight as the ridge weakens and moves inland. Winds increase and back to become southwesterly later tomorrow ahead of an arriving cold front. The wave train that arrived earlier in the week continues to weaken, however, hazardous conditions remain possible through the next couple of days as wave heights align with the period. A new northwest wave train arrives Sunday evening.

7 Day Forecast for Marine Location Near Hercules, CA
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location: 38.02, -122.29     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 202335
afdmtr
area forecast discussion
national weather service san francisco bay area
335 pm pst Sat jan 20 2018

Synopsis Dry and cool weather is forecast for the rest of today
and tonight. The next system is expected to spread rain across
primarily the northern portion of the forecast area from late
Sunday through Sunday night. The weather pattern will remain
active into next week, with more rain likely by midweek.

Discussion As of 1:51 pm pst Saturday... Satellite is showing
clear skies and temperatures a still cool with readings all in the
50s. Looking for mostly clear skies tonight and chilly overnight
temperatures once again. Inland valleys in southern monterey and
san benito counties could see patchy frost. Coldest minimum temps
in the inland valley locations could be in the lower to mid 30s.

Most of Sunday is expected to be dry with the next storm system
forecast to approach the area by afternoon. Rain is expected to
begin in the north bay late Sunday and spread south by Monday
morning. Latest model runs keep the bulk of the precip from the
bay area north, with not much rain expected as far south as
monterey and san benito counties. There are still differences in
model solutions regarding QPF and timing. The locally run WRF has
the most rain forecast for the higher terrain of northern sonoma
and napa counties with storm total rainfall of 2.5". The GFS has
1.5" for the same locations, with the ECMWF giving the area less
than an inch. Our storm-total QPF gives this area just over 2
inches, with 0.25-0.75" for most of the san francisco bay area,
tapering off to less than a quarter of an inch for san jose south,
except for around a half inch in the santa cruz mountains.

After this system moves through, the next one to affect the area
is due late Wednesday into Thursday. This system looks colder and
more robust than the one earlier in the week with a cold upper
low a little farther south. This system is expected to spread
precipitation throughout the CWA with 1-2" in the coastal hills,
to up to 3 4 inch elsewhere.

After this second system exits the area, high pressure is forecast
to build over the eastern pacific for drying conditions into next
weekend.

Aviation As of 3:35 pm pst Saturday for 00z Sunday tafs.VFR
conditions are expected to prevail through the afternoon and into
the early night hours. The forecast gets a bit more challenging
after midnight pst as increasing clouds are expected in advance of
an approaching storm system. High resolution guidance suggests
the possibility of some MVFR ceilings in the san francisco bay
area with a nearly-saturated boundary layer, though confidence
remains low at this time. Will continue to monitor incoming
forecast guidance and amend as necessary. Precipitation will make
its way into the north bay around after 18z Sunday, and
subsequently spread south of the golden gate around after 00z
Monday.

Vicinity of ksfo...VFR conditions expected through the evening and
early night hours. MVFR ceilings are possible after 10 or 12z
Sunday, but confidence remains low at this time. West winds around
15 kt this afternoon will subside after sunset, and gradually
back to the south overnight and into Sunday. Gusty conditions
possible after 00z Monday.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR conditions are expected to prevail
with few sct clouds. Can't rule out a tempo bkn period with MVFR
ceilings, but confidence is low. Onshore winds around 10 to 15 kt
this afternoon will diminish after sunset.

Marine As of 03:18 pm pst Saturday... Breezy northwest winds
today as high pressure remains offshore. Winds will gradually
taper off into tonight as the ridge weakens and moves inland.

Winds increase and back to become southwesterly later tomorrow
ahead of an arriving cold front. The wave train that arrived
earlier in the week continues to weaken, however, hazardous
conditions remain possible through the next couple of days as wave
heights align with the period. A new northwest wave train arrives
Sunday evening.

Mtr watches warnings advisories
Tngt Sca... Pigeon pt to pt pinos 0-10 nm until 3 am
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
sca... Rough bar advisory for sf bar until 9 pm
sca... Mry bay until 9 pm
public forecast: sims
aviation: rowe
marine: drp
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 3 mi52 min WSW 8 G 9.9 54°F 1022.3 hPa
RCMC1 - 9414863 - Richmond, CA 9 mi52 min WNW 11 G 15 53°F 54°F1022.5 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi52 min WNW 8.9 G 13 55°F 1022.9 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 9 mi52 min W 5.1 G 7 53°F 52°F1022.5 hPa46°F
PCOC1 - 9415144 - Port Chicago, CA 14 mi52 min WSW 7 G 8 52°F 52°F1022.2 hPa
OBXC1 15 mi52 min 55°F 41°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 15 mi52 min NW 4.1 G 5.1 54°F 1022.9 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi52 min WNW 4.1 G 4.1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 16 mi52 min WSW 2.9 G 5.1 53°F 1021.8 hPa
LNDC1 16 mi52 min NNW 4.1 G 6 55°F 1022.7 hPa
PXSC1 16 mi52 min 55°F 44°F
FTPC1 - 9414290 - San Francisco, CA 17 mi52 min W 2.9 G 6 53°F 54°F1023.1 hPa
AAMC1 - 9414750 - Alameda, CA 17 mi52 min WNW 1.9 G 4.1 54°F 54°F1022.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 19 mi97 min WNW 7 55°F 1022 hPa39°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 21 mi52 min W 5.1 G 6 54°F 1022.2 hPa
46237 - San Francisco Bar, CA (142) 24 mi52 min 54°F10 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi92 min NW 21 G 25 53°F 54°F10 ft1022.7 hPa (+0.9)
RTYC1 - 9414523 - Redwood City, CA 36 mi52 min W 8 G 9.9 52°F 55°F1023.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 36 mi52 min WNW 20 G 29 53°F1022.8 hPa

Wind History for Union Pacific Rail Road Bridge (UPRR), CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA13 mi29 minSSW 510.00 miFair54°F39°F57%1021.2 hPa
Napa, Napa County Airport, CA13 mi28 minW 610.00 miFair49°F42°F77%1021.7 hPa
Novato / Gnoss Field, CA16 mi27 minW 810.00 miFair54°F39°F58%1023 hPa
Oakland, Metro Oakland International Airport, CA22 mi29 minW 810.00 miPartly Cloudy52°F45°F77%1023.1 hPa
Petaluma Municipal Airport, CA23 mi27 minN 010.00 miFair48°F42°F82%1023 hPa

Wind History from APC (wind in knots)
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Last 24hrW7CalmCalmN3N4NW4W3CalmW3CalmCalmCalmCalmCalmCalmCalmW4CalmW4S5SW6SW6W7W6
1 day agoW5W17
G23
SW4SW5SW5CalmW7CalmSE3CalmSE3N4N3N3CalmCalmCalmSW6W6W10W12W13W10NW6
2 days agoE7E4CalmCalmSE4CalmW4S3SE3CalmCalmE5S3E3E3CalmCalmCalmSW10SW3SW7W9W10W11

Tide / Current Tables for Hercules, Refugio Landing, San Pablo Bay, California
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Hercules
Click for Map
Sat -- 03:19 AM PST     5.55 feet High Tide
Sat -- 07:21 AM PST     Sunrise
Sat -- 08:55 AM PST     2.78 feet Low Tide
Sat -- 09:32 AM PST     Moonrise
Sat -- 02:11 PM PST     6.06 feet High Tide
Sat -- 05:19 PM PST     Sunset
Sat -- 08:57 PM PST     Moonset
Sat -- 09:21 PM PST     0.06 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.7455.55.44.94.23.52.92.83.13.94.85.665.95.34.22.81.60.60.10.21

Tide / Current Tables for Davis Point, California Current
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Davis Point
Click for Map
Sat -- 01:12 AM PST     1.58 knots Max Flood
Sat -- 05:11 AM PST     -0.00 knots Slack
Sat -- 07:21 AM PST     Sunrise
Sat -- 08:32 AM PST     -1.08 knots Max Ebb
Sat -- 09:32 AM PST     Moonrise
Sat -- 10:49 AM PST     0.00 knots Slack
Sat -- 01:04 PM PST     1.48 knots Max Flood
Sat -- 03:34 PM PST     -0.00 knots Slack
Sat -- 05:18 PM PST     Sunset
Sat -- 07:48 PM PST     -2.15 knots Max Ebb
Sat -- 08:57 PM PST     Moonset
Sat -- 11:27 PM PST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.11.61.410.60.1-0.4-0.8-1-1-0.60.21.11.51.20.5-0.3-1.1-1.7-2.1-2.1-2-1.4-0.5

Weather Map and Satellite Images
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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 (21,6,7,8)
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Ground Weather Radar Station Sacramento, 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.