Thursday, July20, 2017

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 6:01AMSunset 8:29PM Thursday July 20, 2017 3:39 PM PDT (22:39 UTC) Moonrise 2:21AMMoonset 4:55PM Illumination 8% Phase: Waning Crescent; Moon at 27 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- 222 Pm Pdt Thu Jul 20 2017
Tonight..SW winds 10 to 20 kt.
Fri..SW winds 5 to 15 kt.
Fri night..SW winds 10 to 20 kt.
Sat..SW winds 5 to 15 kt.
Sat night..SW winds 10 kt.
Sun..SW winds 10 kt.
Mon..SW winds 10 kt.
Tue..SW winds 5 kt...increasing to 5 to 15 kt.
PZZ500 222 Pm Pdt Thu Jul 20 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the eastern pacific will allow for breezy northwest winds to persist over the waters. These winds will produce local wind waves with areas of rough chop. The winds are expected to continue into the weekend, especially for the northern outer waters.

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 202100
area forecast discussion
national weather service san francisco bay area
200 pm pdt Thu jul 20 2017

Synopsis A building ridge of high pressure will lead to warmer
temperatures into the weekend. Patchy drizzle and fog at the coast
is also likely during the overnight hours.

Discussion As of 2:00 pm pdt Thursday... Today was close to a
carbon copy of yesterday with both temperatures and surface
gradients almost exactly the same. In fact, many stations are
within 3 degree of Wednesday at this time. Satellite shows mostly
clear conditions expect for a few pockets of clouds around the
coast. Look for clouds to return to almost all coastal spots plus
inland locations. Lows will be in the mid 40s to the mid 50s in
urban locations with warmer readings above 1,000 feet.

Synoptically a ridge of high pressure will build into our region
over the next several days which will lead to warmer conditions.

Temperatures will rise 2 to 5 degrees both tomorrow and Saturday
before leveling off on Sunday. Thankfully, no indications that we
will warm to values as great as what we saw from the past two heat
events. Even the warmest ECMWF ensemble member falls well short of
the previous weeks. Highs will range from 60s and 70s at most
coastal spots with 80s and 90s inland. Cannot rule out a few lower
100s for far northern and eastern spots, but those should be few
and far between. Heat risk guidance does not indicate an elevated
risk for any of our urban locations. Dry weather can also be

The ridge axis will progress to the east as a weak upper level
low approaches our region. This will lead to moderate cooling for
Monday through Wednesday. Temperatures will slowly build for the
second half of next week as the ridge tries to build back into
our area. 500 mb heights and 925 mb temperatures will both see
increases. At the same time some moisture may approach from the
southeast which could trigger a few showers on Wednesday or
Thursday. For now confidence is too low to add it to the grids.

Aviation As of 10:22 am pdt Thursday for 18z tafs. Mixed bag
this morning with some locations remainingVFR and others ifr.

Ksfo ended up going bkn for a few hours as low clouds expanded in
coverage over the west shore of the san francisco peninsula.

Monterey bay terminals remain bkn ovc but expect clearing by late

Vicinity of ksfo...VFR conditions expected to prevail through the
afternoon and evening. West winds will increase this afternoon
sustained around 20 to 25 kt with gusts possibly approaching 30

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr MVFR ceilings as of the 18z taf
issuance. Expect ksns to goVFR within the next hour or so and kmry
to follow.

Marine As of 10:13 am pdt Thursday... Breezy northwest winds
will continue over the waters this afternoon as high pressure
remains over the eastern pacific. Expect the breezy conditions to
persist into the weekend, particularly for the northern outer

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 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: bell
aviation: rowe
marine: rowe
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 3 mi51 min WSW 12 G 13 72°F 1015.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 9 mi51 min WNW 12 G 13 78°F 70°F1015.7 hPa56°F
RCMC1 - 9414863 - Richmond, CA 9 mi51 min SSE 8.9 G 16
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi51 min S 16 G 18 62°F 1017.3 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi52 min SSE 8 66°F 1017 hPa
PCOC1 - 9415144 - Port Chicago, CA 14 mi51 min W 14 G 16 78°F 72°F1015.1 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 15 mi51 min SW 8 G 13 66°F 1017.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi51 min SW 11 G 15
OBXC1 15 mi51 min 63°F 55°F
PXSC1 16 mi51 min 66°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 16 mi51 min SW 8 G 14 64°F 1016.3 hPa
LNDC1 16 mi51 min SSW 6 G 11 65°F 1017.4 hPa
FTPC1 - 9414290 - San Francisco, CA 17 mi51 min WSW 19 G 25
AAMC1 - 9414750 - Alameda, CA 17 mi51 min SW 8.9 G 11 64°F 69°F1017.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 19 mi114 min W 9.9 81°F 1015 hPa59°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 21 mi51 min NW 13 G 17 80°F 1014.6 hPa
46237 - San Francisco Bar, CA (142) 24 mi69 min 55°F5 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi49 min NW 9.7 G 12 54°F 51°F6 ft1018.3 hPa (-0.4)
RTYC1 - 9414523 - Redwood City, CA 36 mi51 min W 12 G 16 68°F 73°F1016.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 36 mi51 min WNW 23 G 28 61°F 55°F1017.4 hPa

Wind History for Union Pacific Rail Road Bridge (UPRR), CA
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA13 mi46 minW 810.00 miFair89°F51°F27%1013.8 hPa
Napa, Napa County Airport, CA13 mi45 minS 1310.00 miFair81°F55°F42%1015 hPa
Novato / Gnoss Field, CA16 mi44 minSW 1310.00 miFair82°F53°F37%1015.6 hPa
Oakland, Metro Oakland International Airport, CA22 mi46 minW 1210.00 miA Few Clouds70°F55°F59%1017.6 hPa
Petaluma Municipal Airport, CA23 mi44 minW 109.00 miFair81°F53°F39%1016.6 hPa

Wind History from APC (wind in knots)
Last 24hrS13S15S15S13SW12S13S8SW9SW10SW13SW10W6W3W4CalmW3SW5SW9SW9S7S10S10SW13S13
1 day agoS14S15S12S14S12S10S10S10SW8W6SW9SW7CalmCalmCalmCalmW3SW45SW5S7S7S9SW12
2 days agoS12S12S7S10S8S10S11SW8SW7SW5SW9----SW6W4SW7W5SW8S13SW14S11S10S11S15

Tide / Current Tables for Hercules, Refugio Landing, San Pablo Bay, California
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Thu -- 03:21 AM PDT     Moonrise
Thu -- 05:27 AM PDT     -0.48 feet Low Tide
Thu -- 06:02 AM PDT     Sunrise
Thu -- 11:53 AM PDT     5.02 feet High Tide
Thu -- 05:01 PM PDT     2.36 feet Low Tide
Thu -- 05:55 PM PDT     Moonset
Thu -- 08:28 PM PDT     Sunset
Thu -- 10:46 PM PDT     7.62 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Davis Point, California Current
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Davis Point
Click for Map
Thu -- 03:21 AM PDT     Moonrise
Thu -- 04:07 AM PDT     -2.43 knots Max Ebb
Thu -- 06:02 AM PDT     Sunrise
Thu -- 07:30 AM PDT     0.00 knots Slack
Thu -- 09:59 AM PDT     1.05 knots Max Flood
Thu -- 01:33 PM PDT     -0.00 knots Slack
Thu -- 04:31 PM PDT     -1.12 knots Max Ebb
Thu -- 05:55 PM PDT     Moonset
Thu -- 06:31 PM PDT     0.00 knots Slack
Thu -- 08:28 PM PDT     Sunset
Thu -- 09:05 PM PDT     2.00 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of CentralWestCoast    EDIT

Wind Forecast for San Francisco/Monterey Bay Area, CA (18,4,5,8)
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Ground Weather Radar Station Sacramento, CA
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weather_mapweather_map weather_map

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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 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 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.