Wednesday, May27, 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 5:48AMSunset 8:21PM Tuesday May 26, 2020 9:50 PM PDT (04:50 UTC) Moonrise 8:07AMMoonset 11:15PM Illumination 25% Phase: Waxing Crescent; Moon at 5 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- 906 Pm Pdt Tue May 26 2020
Tonight..SW winds 5 to 15 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 10 to 20 kt with gusts up to 25 kt.
Fri..SW winds 10 to 20 kt with gusts up to 25 kt. A chance of showers.
Sat..SW winds 5 to 15 kt. A chance of showers.
PZZ500 906 Pm Pdt Tue May 26 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Breezy northwest winds will persist over the northern waters through Wednesday. These winds will generate steep fresh swell resulting in hazardous seas conditions for small crafts. Generally light to moderate northwest winds are expected elsewhere with winds generally easing across the waters late this week as an upper ridge sits over california and an upper low slowly approaches from the southwest. Mixed seas will continue with a short period northwest swell and a longer period southwest swell. A longer period northwest swell will arrive later this week.


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 270434 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 934 PM PDT Tue May 26 2020

SYNOPSIS. Very warm to hot daytime temperatures will continue in the farther inland areas through Thursday. Thus, a Heat Advisory remains in effect across the interior. Some cooling will take place along the coast and immediately around the bays on Wednesday. Then Wednesday night and Thursday, the marine layer and coastal stratus are projected to redevelop, with low cloudiness moving locally inland Thursday morning. Cooler afternoon temperature are expected for the coastal valleys Thursday and districtwide Friday as the marine layer deepens and onshore flow increases. There is a chance of rain showers late Friday night into Saturday when isolated thunderstorms will also be possible.

DISCUSSION. as of 9:25 PM PDT Tuesday . Clear skies and mild to warm temperatures prevail across the district this evening following a pretty toasty afternoon, especially inland. A number of record high temperatures for the date were set (see SFORERMTR), with Concord Airport, Livermore Airport and Gilroy all reaching 102 deg, the first time in 2020 each has made it up to or exceeded the 100 deg mark. Will also note that for the first time this year we're seeing temperatures remain quite warm overnight up in the hills. Several of the RAWS sites reported lows last night in the mid 70s.

Basic forecast picture remains unchanged, though just received 00Z run of the NAM model indicates redevelopment of the marine layer and return of the coastal stratus beginning Wednesday night and Thursday morning, earlier than previously anticipated. Wednesday afternoon highs looks to be pretty similar to those today inland, and a little cooler near the coast as onshore flow increases a bit.

Forecasts for tonight and tomorrow appear on track, and no updates presently anticipated.

PREV DISCUSSION. As of 2:29 PM PDT Tuesday . A 589 dm 500mb ridge of high pressure remains positioned just off of the southern California coast and extends northward through the San Francisco Bay Area. As a result, 850mb temperatures range from 21 to 23 deg C across much of the region with interior surface temperatures well into the 90s. Meanwhile, onshore flow near the coast has held temperatures in the 60s (immediate coast) to lower 80s (such as in Downtown San Francisco). Sky conditions also remain generally clear region-wide with a few to scattered high clouds advecting inland over northern California and small "puff" of lower clouds/fog well offshore of the Monterey Bay.

The aforementioned ridge axis aloft is forecast to shift inland during the next 24 hours or so yet 850mb temperatures will continue to warm. Thus, interior locations will remain very warm tomorrow with widespread 90s again in the interior, yet 2-5 deg F cooler potentially. Additional cooling is likely to occur near the coast as onshore flow begins to increase yet temperatures will still be well above seasonal averages.

As the ridge shifts further to the east on Thursday, cooling will continue to occur region-wide with the most relief likely near the coast. Will continue the Heat Advisory over the interior through Thursday evening regardless of the modest cool down given the cumulative impact of the prolonged very warm to hot temperatures and limited overnight cooling.

By Friday, inland areas cool by as much as 10 degrees (about 20 from the peak of this heat event) as the ridge moves into the Desert Southwest and Great Basin and a mid/upper level low begins to approach the central/southern California coast. This will help to usher in much cooler marine air and finally put an end to this heat event. Precipitation chances will also increase late Friday into Saturday as the system lifts northward while advecting deeper moisture across the region. As the core of the low moves inland over the San Francisco Bay Area and northern California on Saturday, there will also be the potential for isolated thunderstorm. Have added a slight chance of thunderstorms to the forecast for locations north of the Golden Gate as the NBM has also increased probabilities to above 20 percent. It will be important to monitor this closely as the development of thunderstorm may produce dry lightning as rainfall will likely be limited. Longer range guidance indicates continued unsettled weather and cooler temperatures through early next week in response to a broad mid/upper level trough along the West Coast.

AVIATION. as of 4:45 PM PDT Tuesday . For 00z TAFs. Skies will remain clear this evening and overnight through Weds with strong high pressure over the region. Northerly gradients of 8 mb will support keeping any local stratus and fog formation out of terminals. Winds are generally light with typical afternoon seabreeze winds to around 15 kt through sunset.

Vicinity of KSFO . VFR with clear skies tonight into Weds. Evening westerly seabreeze gusts to 15-20 kt then easing overnight.

SFO Bridge Approach . Clear skies with light onshore breezes.

Monterey Bay Terminals . VFR with clear skies forecast tonight through Weds. Light winds, locally to around 15 kt Salinas Valley afternoon/early evening hours.

CLIMATE.

Record highs May 26 May 27 ----------------------------------------------------------------- Santa Rosa 96/1974 94/1984 Kentfield 99/1951 99/1919 Napa 98/1896 102/1984 Richmond 87/1996 98/1984 San Francisco DT 91/1896 85/1933 SFO Airport 89/1974 97/1984 Redwood City 98/1974 98/1984 Half Moon Bay 78/1951 72/1982 Oakland DT 94/1974 100/1984 San Jose 95/1951 101/1984 Gilroy 98/1979 101/1974 Santa Cruz 94/1896 93/1984 Salinas 94/1974 84/2003 King City 104/1974 104/1984

MARINE. as of 9:06 PM PDT Tuesday . Breezy northwest winds will persist over the northern waters through Wednesday. These winds will generate steep fresh swell resulting in hazardous seas conditions for small crafts. Generally light to moderate northwest winds are expected elsewhere with winds generally easing across the waters late this week as an upper ridge sits over California and an upper low slowly approaches from the southwest. Mixed seas will continue with a short period northwest swell and a longer period southwest swell. A longer period northwest swell will arrive later this week.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. Heat Advisory . CAZ506-507-510>513-516>518-528* SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm until 3 AM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 3 AM



PUBLIC FORECAST: Blier/RGass AVIATION: RWW MARINE: RWW

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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 mi56 min WNW 8 G 9.9 84°F 1009 hPa
PCOC1 - 9415144 - Port Chicago, CA 15 mi56 min SSW 1.9 G 5.1 85°F 71°F1009.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 16 mi56 min W 11 G 11 86°F 69°F1009.4 hPa
UPBC1 16 mi56 min WNW 11 G 13
LNDC1 20 mi56 min NNE 4.1 G 5.1 70°F 1010.4 hPa
AAMC1 - 9414750 - Alameda, CA 22 mi56 min W 2.9 G 5.1 70°F 69°F1010.5 hPa
OBXC1 23 mi56 min 69°F 59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 23 mi56 min NNW 1.9 G 2.9 67°F 1010.4 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 23 mi56 min ENE 4.1 G 5.1
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 23 mi56 min WSW 5.1 G 6 78°F 1009.3 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 24 mi56 min SSW 7 G 12 65°F 1010.5 hPa
SFXC1 - San Francisco Bay Reserve, CA 24 mi65 min WNW 5.1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 26 mi56 min SE 2.9 G 2.9 68°F 1009.4 hPa
PXSC1 26 mi56 min 70°F 55°F
RCMC1 - 9414863 - Richmond, CA 27 mi56 min ESE 1.9 G 4.1 69°F 63°F1009.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 29 mi52 min NNW 1.9 69°F 1010 hPa
FTPC1 - 9414290 - San Francisco, CA 30 mi56 min WSW 8 G 16 60°F 61°F1010.6 hPa
RTYC1 - 9414523 - Redwood City, CA 30 mi56 min N 5.1 G 7 74°F 74°F1010.8 hPa
46237 - San Francisco Bar, CA (142) 39 mi50 min 60°F4 ft

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA11 mi57 minN 010.00 miFair88°F55°F34%1008 hPa
Livermore, Livermore Municipal Airport, CA13 mi57 minN 010.00 miFair84°F54°F36%1009.7 hPa
Hayward, Hayward Air Terminal, CA18 mi56 minN 010.00 miFair79°F57°F47%1010.9 hPa
Oakland, Metro Oakland International Airport, CA20 mi57 minWNW 710.00 miA Few Clouds73°F57°F59%1010.2 hPa

Link to 5 minute data for KCCR

Wind History from CCR (wind in knots)
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Last 24hrS5CalmCalmNW3CalmN4CalmN3NW4S3CalmCalmCalmNE5N5NW8N5NW8W12NW12W10W10W6Calm
1 day agoS6S4S4S3CalmN3CalmCalmSE33SW3CalmCalmN3E643NW4NW8W7W10W14SW6SW4
2 days agoS8S7SW6S7NW3CalmCalmCalmCalmS4SW4CalmCalmCalm3N45NW6NW7
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Tide / Current Tables for Mallard Island Ferry Wharf, Suisun Bay, California
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Mallard Island Ferry Wharf
Click for Map
Wed -- 12:14 AM PDT     Moonset
Wed -- 12:34 AM PDT     1.76 feet Low Tide
Wed -- 05:48 AM PDT     Sunrise
Wed -- 05:48 AM PDT     4.12 feet High Tide
Wed -- 10:08 AM PDT     Moonrise
Wed -- 01:48 PM PDT     -0.40 feet Low Tide
Wed -- 08:21 PM PDT     Sunset
Wed -- 08:54 PM PDT     3.06 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.81.82.12.63.444.13.83.22.41.50.60-0.3-0.4-0.20.41.21.92.52.93.12.92.5

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
Wed -- 12:14 AM PDT     Moonset
Wed -- 12:46 AM PDT     -0.45 knots Max Ebb
Wed -- 03:15 AM PDT     0.00 knots Slack
Wed -- 05:48 AM PDT     Sunrise
Wed -- 06:17 AM PDT     1.34 knots Max Flood
Wed -- 08:33 AM PDT     -0.00 knots Slack
Wed -- 10:08 AM PDT     Moonrise
Wed -- 12:08 PM PDT     -1.97 knots Max Ebb
Wed -- 04:50 PM PDT     0.00 knots Slack
Wed -- 08:15 PM PDT     1.35 knots Max Flood
Wed -- 08:21 PM PDT     Sunset
Wed -- 11:43 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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-0.4-0.4-0.3-0.10.411.31.20.5-0.3-1.1-1.7-2-1.9-1.6-1.1-0.50.10.81.21.31.310.5

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (0,6,7,8)
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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.