Saturday, August8, 2020
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Marine Weather and Tides
Belvedere, 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 6:18AMSunset 8:11PM Saturday August 8, 2020 5:22 AM PDT (12:22 UTC) Moonrise 10:09PMMoonset 10:03AM Illumination 79% Phase: Waning Gibbous; Moon at 19 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- 200 Am Pdt Sat Aug 8 2020
.small craft advisory in effect from this afternoon through this evening...
Today..SW winds 10 to 20 kt with gusts up to 30 kt in the afternoon.
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt.
Sun..SW winds 10 to 20 kt with gusts up to 25 kt.
Sun night..SW winds 5 to 15 kt.
Mon..SW winds 10 to 20 kt with gusts up to 30 kt.
Mon night..SW winds 10 to 20 kt with gusts up to 25 kt.
Tue..SW winds 5 to 15 kt.
Wed..SW winds 5 to 15 kt.
PZZ500 200 Am Pdt Sat Aug 8 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Split flow today and tonight with north to northwest winds over the outer waters and southerly winds along the inner coastal waters. Expect locally breezy conditions to persist over the northern outer waters through much of the weekend. These winds will create locally hazardous conditions for smaller vessels. Winds will diminish into Sunday with southerly winds gradually expanding into much of the outer waters. Mixed seas will continue through the period with a short period northwest swell and a longer period southerly swell.


7 Day Forecast for Marine Location Near Belvedere, CA
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location: 37.83, -122.44     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 081129 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 429 AM PDT Sat Aug 8 2020

SYNOPSIS. Warmer temperatures are expected over the weekend, especially inland. Slightly cooler weather returns early next week.

DISCUSSION. As of 3:00 AM PDT Saturday . There is a weak upper level low over central California with high pressure to the west and to the east over Texas. The upper low is forecast to drift off the coast today allowing the high over Texas to build westward. The 500 mb heights rise which will result in warmer temperatures today and Sunday. Temperatures will be warmest on Sunday ranging from the mid 60s to low 70s at the coast . to the 90s well inland, about 5 degrees above normal. The marine layer will become compressed while surface winds become light southerly near the coast. This will maintain the night and morning low clouds at the coast with less inland penetration.

Something to watch is the upper low drawing in some mid-level moisture from the Sierras into our district. Models indicate increased humidities at around 700 mb Saturday afternoon but believe there is not enough instability to cause any elevated convection within the CWA as the low will be drifting westward.

Still looking at cooling for early next week as an upper trough moves into British Columbia and deepens along the west coast. Temperatures should cool back to near normal values.

AVIATION. As of 04:29 AM PDT Saturday . for 12z TAFs. Mixed conditions this morning ranging from VFR to IFR. The marine layer is around 1500 to 1800 ft per profiler data while satellite imagery shows stratus along the coast through the Golden Gate gap and over the Monterey Bay region. Expecting VFR conditions to develop late this morning around 17z-18z then prevailing this afternoon. Expect low clouds to redevelop again overnight. Light winds this morning turning onshore this afternoon around 15 kt.

Vicinity of KSFO . Satellite shows patches of stratus developing around the south SF Bay. Intermittent IFR/VFR conditions this morning (until ~16z). Surrounding observations put cigs at about 600 to 700 ft. VFR conditions by late morning with increasing onshore winds to about 15 kt or so.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . IFR/LIFR conditions this morning. Satellite shows stratus over the Bay, Peninsula, and down the Salinas Valley. VFR conditions expected to develop by around 18z with another early return of stratus anticipated this evening. Onshore winds this afternoon around 10-15 kt.

MARINE. as of 01:56 AM PDT Saturday . Split flow today and tonight with north to northwest winds over the outer waters and southerly winds along the inner coastal waters. Expect locally breezy conditions to persist over the northern outer waters through much of the weekend. These winds will create locally hazardous conditions for smaller vessels. Winds will diminish into Sunday with southerly winds gradually expanding into much of the outer waters. Mixed seas will continue through the period with a short period northwest swell and a longer period southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . SF Bay from 3 PM



PUBLIC FORECAST: W Pi AVIATION: AS MARINE: AS

Visit us at www.weather.gov/sanfrancisco

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FTPC1 - 9414290 - San Francisco, CA 2 mi53 min WSW 5.1 G 8.9 56°F 62°F1014.1 hPa
PXSC1 3 mi53 min 58°F 58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi53 min W 5.1 G 7 57°F 1012.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi53 min NE 4.1 G 5.1
OBXC1 6 mi53 min 59°F 59°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi53 min NW 5.1 G 7 58°F 1013.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi53 min SW 14 G 19 58°F 1014 hPa
RCMC1 - 9414863 - Richmond, CA 7 mi53 min W 2.9 G 6 58°F 66°F1013.6 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi53 min N 1 G 1.9 59°F 69°F1013.9 hPa
LNDC1 9 mi53 min NE 4.1 G 6 59°F 1013.8 hPa
46237 - San Francisco Bar, CA (142) 11 mi53 min 58°F5 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi53 min WSW 9.9 G 17 59°F 1013.2 hPa
UPBC1 22 mi53 min WNW 9.9 G 13
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi33 min S 12 G 14 53°F 54°F7 ft1014.4 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi53 min NW 8.9 G 12 60°F 69°F1013 hPa
RTYC1 - 9414523 - Redwood City, CA 25 mi53 min WNW 1.9 G 4.1 62°F 73°F1014.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi53 min W 17 G 19 60°F 70°F1012.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi53 min NW 12 G 18 64°F 1011.9 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi98 min W 8
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi33 min S 7.8 G 12 55°F 9 ft1014.8 hPa55°F

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA15 mi30 minNNE 310.00 miMostly Cloudy60°F54°F80%1013.9 hPa
San Francisco, San Francisco International Airport, CA15 mi27 minN 010.00 miFair58°F54°F87%1013.7 hPa
Hayward, Hayward Air Terminal, CA21 mi29 minN 09.00 miA Few Clouds61°F55°F81%1014.6 hPa
Half Moon Bay Airport, CA22 mi28 minSSE 104.00 miFog/Mist55°F55°F100%1014.6 hPa
Concord, Buchanan Field, CA23 mi30 minN 410.00 miFair61°F55°F84%1011.7 hPa
San Carlos Airport, CA23 mi28 minN 010.00 miOvercast61°F57°F88%1014.2 hPa
Novato / Gnoss Field, CA23 mi48 minNNW 410.00 miFair54°F51°F94%1013.9 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrS4NW7CalmSE4N4NE7NE6NE7N8NE7NW9NW13NW13NW16NW14NW14NW10NW10NW10NW7W6W7W5Calm
1 day agoSW7CalmSW5N5NE6NE6NE7NW15NW13W19W16W15
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W12W8SW10SW7CalmN3CalmS4
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Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Sat -- 03:06 AM PDT     4.95 feet High Tide
Sat -- 06:19 AM PDT     Sunrise
Sat -- 09:27 AM PDT     0.88 feet Low Tide
Sat -- 11:02 AM PDT     Moonset
Sat -- 04:16 PM PDT     5.19 feet High Tide
Sat -- 08:10 PM PDT     Sunset
Sat -- 10:12 PM PDT     2.21 feet Low Tide
Sat -- 11:08 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.54.24.74.94.84.23.22.21.40.911.42.23.24.14.85.25.14.63.83.12.52.22.3

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Sat -- 01:32 AM PDT     1.90 knots Max Flood
Sat -- 04:44 AM PDT     -0.00 knots Slack
Sat -- 06:19 AM PDT     Sunrise
Sat -- 07:39 AM PDT     -2.09 knots Max Ebb
Sat -- 11:02 AM PDT     0.01 knots Slack
Sat -- 11:03 AM PDT     Moonset
Sat -- 02:03 PM PDT     2.26 knots Max Flood
Sat -- 05:36 PM PDT     -0.01 knots Slack
Sat -- 08:10 PM PDT     -1.73 knots Max Ebb
Sat -- 08:10 PM PDT     Sunset
Sat -- 11:08 PM PDT     Moonrise
Sat -- 11:34 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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1.21.81.91.40.7-0.2-1.2-1.9-2-1.6-0.8-011.92.32.11.50.6-0.4-1.3-1.7-1.5-1-0.4

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (8,2,3,4)
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Ground Weather Radar Station San Francisco Bay Area, 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.