Saturday, April4, 2020
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Marine Weather and Tides
Diablo, 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 6:46AMSunset 7:35PM Saturday April 4, 2020 6:05 PM PDT (01:05 UTC) Moonrise 2:43PMMoonset 4:02AM Illumination 91% Phase: Waxing Gibbous; Moon at 12 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- 236 Pm Pdt Sat Apr 4 2020
.small craft advisory in effect from Sunday morning through Sunday afternoon...
Tonight..S winds 5 to 15 kt. A chance of showers this evening, then showers after midnight.
Sun..SW winds 15 to 25 kt with gusts up to 30 kt. Showers.
Sun night..W winds up to 10 kt. A chance of showers.
Mon..S winds up to 10 kt. A chance of showers.
Mon night..NW winds 5 to 10 kt.
Tue..SW winds 5 to 15 kt.
Tue night..W winds 5 to 10 kt.
Wed..SW winds 5 to 10 kt.
Thu..SW winds up to 10 kt.
PZZ500 236 Pm Pdt Sat Apr 4 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Southwesterly winds will prevail through tonight as a storm system moves across the coastal waters. This storm will bring wet weather to the region through early next week. High pressure will return by the middle of next week bringing a return of drier weather. A prevailing moderate northwesterly swell will persist through much of the forecast period.


7 Day Forecast for Marine Location Near Diablo, CA
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location: 37.87, -121.91     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 050021 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 521 PM PDT Sat Apr 4 2020

SYNOPSIS. Light to locally moderate showers will continue this afternoon and tonight as a cold front moves through the region. Showers overnight become a steady rain tomorrow as another system drops down the coast. Locally heavy rain, possible thunderstorms and gusty winds during the day tomorrow. Precipitation becomes showers tomorrow night into Monday as the upper low passes over the region. Showers may linger for the Central Coast Tuesday and Wednesday as the upper low slowly exits the region followed by a warming and drying trend for the second half of next week.

DISCUSSION. as of 01:45 PM PDT Saturday . Radar shows showers continue across the region this afternoon as a cold front moves through. Rainfall amounts have varied with as little as a few hundredths in some locations to over a quarter of an inch near Santa Rosa and along the coastal areas of the North Bay. Showers will continue the rest of the afternoon and this evening before turning into a more steady rainfall tomorrow as another cold front gets ready to pass through the area. The front is expected to reach the North Bay tomorrow morning before moving south of the Bay Area and into the Monterey Region in the late afternoon.

Tomorrow's system will be better organized with more upper level support creating some locally heavier rainfall along with periods of gusty winds and possible thunderstorms. Latest QPF guidance keeps the bulk of the heavier precipitation focused from the Santa Cruz mountains southward to the Santa Lucia's and Big Sur coast while reducing rainfall totals somewhat for areas elsewhere. Generally expect around 0.50"-0.75" for lower elevations and the Bay Area with 0.75"-1.25" around the Monterey Bay and 2-3 inches in the hills of the Central Coast. Locally higher rainfall totals will be possible for some of the Big Sur mountains. There will be a slight chance of thunderstorms across the region tomorrow afternoon through Monday afternoon, though the best chances will be outside of our area as the core of the upper low is still expected to remain offshore. Additionally, expect occasionally gusty winds as the front moves through tomorrow, particularly along the Big Sur Coast south of the Monterey Peninsula. Therefore the Wind Advisory for the southern Monterey Bay, Monterey Peninsula, Carmel Highlands, and Big Sur Coast will remain in effect for tomorrow morning into the early evening.

Showers will persist into tomorrow evening as the main surface boundary moves through, with the best rainfall chances at that point south of the Bay Area. Precipitation chances will remain in the forecast for Monday as the upper low slowly makes its way southward across the region. Activity will likely be more scattered with the higher elevations of the Central Coast and southward most likely to see thunderstorms on Monday. Little has changed with regard to snow levels. Sunday, when the bulk of the rain is expected, will see snow levels above 4500 feet before lowering to around 3000/3500 feet on Monday when precipitation is more scattered. Higher peaks may see a dusting though.

The upper low will then slowly make its way southward through mid-week. There are some timing differences between the GFS and the ECMWF at this point. The GFS moves the system into soCal more quickly and ends shower chances for the Central Coast by Tuesday afternoon while the ECMWF lags behind enough to keep showers lingering into Wednesday. Once the upper low does finally exit, high pressure will build back in late next week leading to warming and drying. Many interior locations may be in the low 70s towards the end of the week.

AVIATION. as of 5:20 PM PDT Saturday . The first of two systems is moving through the Bay Area this afternoon. This will bring light rain and mostly MVFR cigs through early evening. A short break from the rain in the Bay Area tonight with cigs rising. Southerly winds will start to increase rapidly after 09Z ahead of the second system. Could see gusts as high as 35 kt by Sunday morning as well as rain and reduced vsbys. Destabilizing atmosphere will bring a possibility of thunderstorms after 18Z.

Vicinity of KSFO . MVFR cigs will prevail with bases around 1500 ft. Bases could rise to 2500 ft tonight in between systems. Southerly winds to 15 kt increasing after 09Z with speeds as high as 20-25 kt gusting to 30-35 kt after 13Z. Winds switch to southwest and decrease after 19Z. Possibility of thunderstorms and lower cigs heading into Sunday afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . A weak frontal system will bring a few showers this evening with areas of MVFR cigs. The front will stall out and intensify early Sunday morning as the second system approaches. Rain should pick up after 12-15Z with MVFR cigs prevailing. Southerly winds increasing to 20-25 kt after 15Z especially in the Salinas Valley where gusts over 35 kt is possible. Possibility of thunderstomrs after 18Z.

MARINE. as of 04:57 PM PDT Saturday . Southwesterly winds will prevail through tonight as a storm system moves across the coastal waters. This storm will bring wet weather to the region through early next week. High pressure will return by the middle of next week bringing a return of drier weather. A prevailing moderate northwesterly swell will persist through much of the forecast period.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. Wind Advisory . CAZ530 SCA . Pt Arena to Pigeon Pt 10-60 nm from 12 AM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm from 12 AM SCA . Pt Arena to Pt Reyes 0-10 nm from 12 AM SCA . Pt Reyes to Pigeon Pt 0-10 nm from 12 AM



PUBLIC FORECAST: AS AVIATION: W Pi MARINE: CW

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 12 mi53 min SW 8 G 14 58°F 1008.6 hPa
PCOC1 - 9415144 - Port Chicago, CA 15 mi47 min SSW 8.9 G 14 55°F 59°F1008.3 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 16 mi47 min SSW 14 G 16 56°F 59°F1008.5 hPa
UPBC1 16 mi47 min WSW 11 G 22
LNDC1 20 mi47 min SW 8 G 11 55°F 1009.1 hPa
AAMC1 - 9414750 - Alameda, CA 22 mi47 min SW 12 G 13 55°F 59°F1009.3 hPa
OBXC1 23 mi47 min 55°F 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 23 mi47 min SW 9.9 G 15 55°F 1009.1 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 23 mi53 min SW 15 G 17
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 23 mi47 min SW 14 G 18 55°F 1008.2 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 24 mi47 min SW 17 G 27 56°F 1009 hPa
SFXC1 - San Francisco Bay Reserve, CA 24 mi80 min SW 12
PXOC1 - 9414311 - San Francisco (Pier 1), CA 26 mi47 min W 7 G 12 55°F 1008.2 hPa
PXSC1 26 mi47 min 56°F 56°F
RCMC1 - 9414863 - Richmond, CA 27 mi47 min WSW 8.9 G 14 52°F 57°F1008.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 29 mi37 min Calm 51°F 1009 hPa
FTPC1 - 9414290 - San Francisco, CA 30 mi47 min 59°F
RTYC1 - 9414523 - Redwood City, CA 30 mi47 min SW 6 G 9.9 55°F 60°F1010 hPa
46237 - San Francisco Bar, CA (142) 39 mi35 min 55°F5 ft

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA11 mi72 minS 10 G 203.00 miLight Rain Fog/Mist57°F53°F87%1007.5 hPa
Livermore, Livermore Municipal Airport, CA13 mi72 minSW 910.00 miLight Rain55°F50°F83%1009.1 hPa
Hayward, Hayward Air Terminal, CA18 mi71 minSSW 15 G 1910.00 miOvercast58°F51°F78%1010.3 hPa
Oakland, Metro Oakland International Airport, CA20 mi72 minSW 142.00 miLight Rain Fog/Mist58°F53°F84%1009.5 hPa

Link to 5 minute data for KCCR

Wind History from CCR (wind in knots)
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Last 24hrW8W8W6S9S9S10S9S10SW10S10S9S9S7S11S10S9S12S11S15S12
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1 day agoW9SW8S5SW6S7S7S6S7S7SW6SW6SW3S4CalmSW53SW6W6NW8NW11NW8W8W9SW9
2 days agoW9W9W5--W5SW4SW4SE3SE3SE4CalmS3CalmS3CalmCalm6NW4W93--W9SW11
G17
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Tide / Current Tables for Pittsburg, New York Slough, Suisun Bay, California
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Pittsburg
Click for Map
Sat -- 01:30 AM PDT     3.40 feet High Tide
Sat -- 05:01 AM PDT     Moonset
Sat -- 06:47 AM PDT     Sunrise
Sat -- 07:00 AM PDT     1.32 feet Low Tide
Sat -- 12:29 PM PDT     3.88 feet High Tide
Sat -- 03:42 PM PDT     Moonrise
Sat -- 07:34 PM PDT     Sunset
Sat -- 07:55 PM PDT     -0.18 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.93.33.332.41.91.51.31.52.12.83.53.83.83.52.81.91.10.4-0-0.20.10.81.7

Tide / Current Tables for Antioch Pt .3 mi E, San Joaquin River, California Current
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Antioch Pt .3 mi E
Click for Map
Sat -- 01:21 AM PDT     1.47 knots Max Flood
Sat -- 04:02 AM PDT     -0.00 knots Slack
Sat -- 05:01 AM PDT     Moonset
Sat -- 06:42 AM PDT     -0.98 knots Max Ebb
Sat -- 06:46 AM PDT     Sunrise
Sat -- 09:32 AM PDT     0.00 knots Slack
Sat -- 12:27 PM PDT     1.45 knots Max Flood
Sat -- 02:58 PM PDT     -0.00 knots Slack
Sat -- 03:42 PM PDT     Moonrise
Sat -- 06:22 PM PDT     -1.77 knots Max Ebb
Sat -- 07:33 PM PDT     Sunset
Sat -- 10:29 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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1.31.51.40.90-0.6-0.9-1-0.8-0.30.411.41.40.9-0-0.8-1.5-1.7-1.7-1.5-1-0.30.4

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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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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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.