Tuesday, August11, 2020
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Marine Weather and Tides
Hercules, CA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
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.

Sunrise 6:20AMSunset 8:08PM Tuesday August 11, 2020 12:38 PM PDT (19:38 UTC) Moonrise 11:31PMMoonset 12:54PM Illumination 46% Phase: Third Quarter Moon; Moon at 23 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- 824 Am Pdt Tue Aug 11 2020
.small craft advisory in effect from 2 pm pdt this afternoon through this evening...
Rest of today..SW winds 10 to 20 kt with gusts up to 30 kt.
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt.
Wed..SW winds 10 to 20 kt with gusts up to 25 kt.
Wed night..SW winds 5 to 15 kt.
Thu..SW winds 10 to 20 kt with gusts up to 25 kt.
Thu night..SW winds 5 to 15 kt.
Fri..SW winds 5 to 15 kt.
Sat..SW winds 5 to 15 kt.
PZZ500 824 Am Pdt Tue Aug 11 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A 1028 mb high centered 1200 miles west of cape blanco will move slowly closer to the west coast through late week while weakening as a low pressure system develops in the gulf of alaska. Northwest winds will increase today through Thursday before decreasing on Friday. Mixed seas will continue through the period with a short period northwest swell and a longer period southerly swell. Southerly swell will increase Tuesday and Wednesday.


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 111743 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1043 AM PDT Tue Aug 11 2020

SYNOPSIS. A slight cooling trend will continue today, especially across the interior. Meanwhile, little change is anticipated near the coast with the typical ebb and flow of low clouds each night/morning. A warming trend is forecast to begin on Wednesday and continue through the end of the week and into the weekend.

DISCUSSION. as of 08:56 AM PDT Tuesday . Solid push of stratus across much of the inland valleys this morning. This forecaster had to run the wipers this morning on the way into the office. A quick look at automated gages also show a few buckets tips near Pt Reyes and some of the hills. Given solid marine layer push and decent onshore flow, dissipation of the low clouds will be slow in the morning. Therefore, today will be a few degrees cooler than Monday. No update this morning.

Weather topics for the afternoon forecast package will be fine tuning potential heat Thursday into the weekend and any convection concerns as tropical moisture drifts northward.

PREV DISCUSSION. As of 2:00 AM PDT Tuesday . Coastal profilers at both Bodega Bay and Fort Ord indicate a slight deepening of the marine layer over the past 24 hours. In addition, onshore surface pressure gradients have increased. These developments are in response to an upper trough settling into the Pacific Northwest and weakening the ridge over California a bit. This process will continue today and result in another 3 to 7 degrees of cooling, with most cooling expected across the interior.

As the upper trough to our north shifts to the east on Wednesday, surface high pressure will build off the northern California coast, resulting in a return to more typical northwesterly surface winds by Wednesday afternoon. These northwest winds may increase sufficiently by afternoon to sweep low clouds away from the coast north of the Golden Gate by late in the day. In addition, increasing north-to-south surface pressure gradients will limit onshore flow to some extent on Wednesday, which will result in the start of a warming trend for much of our area.

The warming trend is then expected to continue through the remainder of the week and into the upcoming weekend as an upper ridge over the Desert Southwest gradually expands west and northward across California. High temperatures in our warmest interior valleys will climb to around 100 by Friday, with additional warming possible over the weekend. Surface flow is forecast to remain onshore and thus coastal areas will experience less robust warming. But the marine layer will likely compress to a depth of less than 1000 feet by late in the week, allowing temperatures to warm into the 80s not all that far from the coast, while 90s will be common in the coastal valleys and hills by late in the week. Heat Risk is currently projected to remain mostly in the moderate category, but scattered areas of high Heat Risk are projected in the interior valleys and hills by Friday and on into the weekend.

Remnant moisture from Hurricane Elida is forecast to be drawn northward around the western periphery of the Desert Southwest high and across the southern portion of our forecast area by late Thursday and Thursday night. This moisture plume is then forecast to lift northward across much of the rest of our forecast area by early in the weekend. Additional moisture from a second tropical system may then arrive over our area by early next week. Models do not generate precipitation over our area from this moisture, and the model blend currently keeps thunderstorm chances at less than 10 percent. In any case, this moisture and any possible mid-level instability will need to be monitored closely due to the potential for significant impacts if dry lightning were to develop.

AVIATION. as of 10:40 AM PDT Tuesday . A deepening marine layer and increased onshore flow in the lower levels resulted further inland penetration of stratus this morning. Additionally, clearing has been slower to occur at coastal and North Bay terminals. Surface winds will increase and any remaining clouds will dissipate through the remainder of the morning with breezy W/NW winds into the afternoon and early evening. Persistent pattern is likely through Wednesday morning with low clouds spreading back inland overnight along with diminishing wind speeds.

Vicinity of KSFO . VFR. W/NW winds increasing to 12-15 kt this afternoon. Winds speeds diminish slightly overnight with increased confidence of MVFR/IFR ceilings developing around 12Z Wednesday.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR/IFR ceilings lingering over the terminals this morning yet should dissipate for a few hours this afternoon along with an increase W/NW winds. Winds again diminish this evening with high confidence of an early return of IFR/LIFR ceilings overnight.

MARINE. as of 10:40 AM PDT Tuesday . A 1028 mb high centered 1200 miles west of Cape Blanco will move slowly closer to the West Coast through late week while weakening as a low pressure system develops in the Gulf of Alaska. Northwest winds will increase today through Thursday before decreasing on Friday. Mixed seas will continue through the period with a short period northwest swell and a longer period southerly swell. Southerly swell will increase Tuesday and Wednesday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . SF Bay from 2 PM



PUBLIC FORECAST: MM/Dykema AVIATION: RGass MARINE: RGass

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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 mi51 min SW 12 G 16 63°F 1014 hPa
UPBC1 9 mi51 min W 16 G 22
RCMC1 - 9414863 - Richmond, CA 9 mi51 min 65°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi51 min SW 8 G 11 61°F 1015.3 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 9 mi51 min WSW 15 G 19 64°F 69°F1013.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 14 mi51 min W 20 G 24 65°F 70°F1013.2 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 15 mi51 min W 8 G 11 62°F 1014.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 15 mi51 min W 9.9 G 11
OBXC1 15 mi51 min 62°F 61°F
LNDC1 16 mi51 min W 6 G 11 63°F 1014.8 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 16 mi51 min W 8 G 11 63°F 1013.9 hPa
PXSC1 16 mi51 min 63°F 60°F
FTPC1 - 9414290 - San Francisco, CA 17 mi51 min 63°F
AAMC1 - 9414750 - Alameda, CA 17 mi51 min 69°F
SFXC1 - San Francisco Bay Reserve, CA 19 mi114 min W 15
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 21 mi51 min NW 18 G 23 67°F 1012.6 hPa
46237 - San Francisco Bar, CA (142) 24 mi69 min 59°F4 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi39 min SSE 7.8 G 12 56°F 57°F1015.5 hPa (+0.8)56°F
RTYC1 - 9414523 - Redwood City, CA 36 mi51 min NW 8.9 G 11 68°F 75°F1014.7 hPa

Wind History for Point Potrero Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA13 mi46 minW 1310.00 miFair74°F55°F52%1012 hPa
Napa, Napa County Airport, CA13 mi45 minSSW 1210.00 miA Few Clouds69°F57°F68%1013.1 hPa
Novato / Gnoss Field, CA16 mi44 minVar 7 G 1310.00 miFair73°F57°F57%1014.2 hPa
Oakland, Metro Oakland International Airport, CA22 mi46 minNW 1310.00 miA Few Clouds71°F57°F61%1014.6 hPa
Petaluma Municipal Airport, CA23 mi44 minNW 710.00 miOvercast68°F60°F78%1014.9 hPa

Link to 5 minute data for KCCR

Wind History from CCR (wind in knots)
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Last 24hrNW13W10W11
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W12W11W10W9NW7W7W5W6SW4W7W5SW7SW6SW7SW7SW7SW7W13W12W12W13
1 day agoNW8N8NW12SW12
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W12SW11W11W10W5W6W4CalmNW6NW5CalmNW6NW7NW7W4NW3NW8NW10NW10NW10
2 days agoNW9NW13W10W13W11SW11W9SW7NW6NW7NW8W5NW6W5NW4NW3NW4CalmNW3Calm53N8NW8

Tide / Current Tables for Hercules, Refugio Landing, San Pablo Bay, California
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Hercules
Click for Map
Tue -- 12:00 AM PDT     Moonrise
Tue -- 01:45 AM PDT     1.76 feet Low Tide
Tue -- 06:21 AM PDT     Sunrise
Tue -- 07:17 AM PDT     4.12 feet High Tide
Tue -- 09:47 AM PDT     Last Quarter
Tue -- 01:05 PM PDT     2.43 feet Low Tide
Tue -- 01:54 PM PDT     Moonset
Tue -- 07:04 PM PDT     5.98 feet High Tide
Tue -- 08:06 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.21.81.82.12.73.33.84.14.13.83.42.92.62.42.63.244.95.765.85.34.53.5

Tide / Current Tables for Davis Point, California Current
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Davis Point
Click for Map
Tue -- 12:00 AM PDT     Moonrise
Tue -- 12:37 AM PDT     -1.63 knots Max Ebb
Tue -- 03:43 AM PDT     0.00 knots Slack
Tue -- 05:37 AM PDT     0.74 knots Max Flood
Tue -- 06:21 AM PDT     Sunrise
Tue -- 08:53 AM PDT     -0.00 knots Slack
Tue -- 09:47 AM PDT     Last Quarter
Tue -- 12:42 PM PDT     -1.07 knots Max Ebb
Tue -- 01:54 PM PDT     Moonset
Tue -- 03:01 PM PDT     0.00 knots Slack
Tue -- 05:28 PM PDT     1.58 knots Max Flood
Tue -- 08:06 PM PDT     Sunset
Tue -- 08:36 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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-1.6-1.6-1.3-0.60.20.70.70.50.3-0-0.4-0.8-1-1.1-0.8-00.91.51.510.4-0.2-0.8-1.2

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (15,3,4,5)
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Ground Weather Radar Station Sacramento, CA
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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 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 numerous 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.