Monday, September27, 2021
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Marine Weather and Tides
Belvedere, CA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:00AMSunset 6:59PM Monday September 27, 2021 12:46 AM PDT (07:46 UTC) Moonrise 9:59PMMoonset 12:28PM Illumination 67% Phase: Waning Gibbous; Moon at 21 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- 842 Pm Pdt Sun Sep 26 2021
Tonight..SW winds 10 to 15 kt with gusts up to 25 kt, diminishing to 5 to 10 kt after midnight.
Mon..SW winds 10 to 15 kt with gusts up to 25 kt.
Mon night..W winds 10 to 15 kt with gusts up to 25 kt. A slight chance of rain.
Tue..NW winds 10 to 15 kt.
Tue night..W winds 10 to 15 kt with gusts up to 25 kt.
Wed..SW winds 10 to 15 kt.
Wed night..W winds 5 to 10 kt.
Thu..W winds 5 to 10 kt.
Fri..W winds 5 to 10 kt.
PZZ500 842 Pm Pdt Sun Sep 26 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light to locally moderate northwest winds will continue into tonight. Breezy evening winds expected where coastal jets from south pigeon point and along the big sur coast south of point sur. Winds will briefly shift out of the south to southwest into Monday over much of the waters as a weak cold front moves through. Northwest winds will quickly return by Monday night and then increase into mid week. Seas remain mixed with a moderate west to northwest swell and a longer period southerly swell. A second larger northwest swell will arrive Monday night with seas building into Tuesday. The combination of stronger winds and building swell will result in hazardous seas conditions, particularly for smaller vessels.


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 270626 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1126 PM PDT Sun Sep 26 2021

SYNOPSIS. A low pressure arrives on Monday which will increase onshore winds, cooler temperatures, and bring the potential for very light rain, mainly in the coastal North Bay. Northerly to offshore flow develops in the wake of the trough but elevated humidity will mitigate fire risk. Warmer and drier trend for the second half of the work week.

DISCUSSION. as of 09:15 PM PDT Sunday . The marine layer has held steady near 2000 feet throughout the last 24 hours and has inundated much of the area in a slightly cooler marine air mass versus 24 hours ago. Today's temperatures peaked in the 60s alongshore to mid 80s across the far interior, or down 2-5 degrees versus Saturday, and 2-10 degrees below seasonal normals. Mid level wildfire smoke continued to rotate over the Central Coast and portions of the Bay Area today with minimal mixing down to the surface. Improved air quality is expected to arrive tomorrow as an approaching storm system will bring in a shift in the winds and usher in a fresher air mass.

This storm system is currently centered over the eastern Gulf of Alaska, with a depth of 528dm at 500mb. The base of this trough extends southward to the cusp of the outer coastal waters of the San Francisco Bay Area. The surface cold front situated along the southeastern vanguard of this storm system is presently just offshore of the Pacific Northwest and a few hundred miles west of the Bay Area, closer to 130W. Forecast models indicate that the arrival of this cold front and associated storm system tomorrow will be similar to the last event that occurred just over a week ago, in that the best dynamics, and thus highest rain amounts, will remain well to the north, at least north of Point Arena, and likely north of Cape Mendocino. So, despite the presence of a fairly moist PWAT plume of 1.25-1.35", there is little force, aside from orographic lift, to generate precipitation for the area yet again. Consequently, forecast rain chances will be concentrated along the northern coastal ranges with significantly lower odds elsewhere. Storm total rainfall will be lower, as well, as the orographic forcing mechanisms are weaker than the last event. So, the wettest spots along the northern coastal ranges could see a few to several hundredths, while other less favorable locations will struggle to pick up more more than a hundredth. That said, it will be interesting to watch the interaction with the fairly deep marine layer as even a slight perturbation with it as the system arrives could produce heavier coastal drizzle that may bring a hundredth of precipitation through the morning tomorrow. Otherwise, expect occasionally breezy onshore winds with the arrival of the system and a few infrequent gusts nearer to the front, particularly through coastal gaps. Temperatures will drop another few degrees between today and tomorrow and linger there through Tuesday in the post frontal environment.

In the wake of this system, much like the last, a shift towards northerly then offshore flow will develop across the Sacramento Valley and along our interior ranges. For now, not quite seeing the overlap of the strongest winds (expected overnight Monday and Tuesday), with the driest air (Wednesday during the day). As a result, leaning against a fire weather watch for this round of offshore winds for now but we will continue monitor it closely. Humidities in excess of 50% are expected Monday night, so there is little concern that night. Then, the strongest winds develop over the interior North and East Bay ranges (and coast) Tuesday night with peak gusts to around 40 mph though humidities are forecast to drop to only 35 to 50% where these winds are occurring, well above the critical thresholds. A moderate amplitude transitional ridge will build into the area through Wednesday and promote drier air entrainment. Minimum daytime humidities Wednesday may then drop to 10% but winds will ease by this time. At this point, there does not seem to be a lot of overlap between the strongest winds and critically dry conditions. A warming trend into midweek will also accompany these drier conditions, with a return to seasonable conditions by Thursday.

AVIATION. as of 11:14 PM PDT Sunday . For the 06z TAFs. As a line of dry air moves out of the area, expect widespread MVFR into the night. Expect the Monterey Bay terminals to fall to IFR later into the night. Cloud cover will stick around as a frontal boundary nears the area, leading to MVFR return after a brief period of VFR in the late morning. Chances for Rain approach the North Bay in the late morning, and look to affect the SF Bay and Monterey Bay further into the afternoon. The best chances for rain remain in the North Bay, with less potential and lighter rainfall amounts forecasted for areas further to the South.

Vicinity of KSFO . MVFR through the night. Expect mild to moderate. Cloud cover around the SF Bay will be slow to dissipate, lingering into the late morning. Expect VFR for the late morning and early afternoon, but MVFR for the late afternoon and the remainder of the TAF period. Winds will increase into the afternoon with Westerly winds peaking around 14 kts and 20 kt gusts. Chances for showers look to move into the SF Bay into the afternoon; heavy rain is not expected. Rain chances will last into the evening.

KSFO Bridge Approach . Similar to KSFO. Slant range visibility possibly reduced in wildfire smoke, however model forecasts improvement through the period, especially Monday.

Monterey Bay . MVFR becoming IFR in the late night. Winds remain weak and variable into the late morning. Expect some brief thinning of cloud cover ahead of the front, leading to a short time of VFR in the late morning and early afternoon. MVFR returns in the afternoon as the front moves through. This will also bring chances for light rain that could linger into the late evening.

MARINE. as of 11:24 PM PDT Sunday . Generally light to locally moderate northwest winds will continue into tonight. Breezy evening winds expected where coastal jets from south Pigeon Point and along the Big Sur coast south of Point Sur. Winds will briefly shift out of the south to southwest into Monday over much of the waters as a weak cold front moves through. Northwest winds will quickly return by Monday night and then increase into mid week. Seas remain mixed with a moderate west to northwest swell and a longer period southerly swell. A second larger northwest swell will arrive Monday night with seas building into Tuesday. The combination of stronger winds and building swell will result in hazardous seas conditions, particularly for smaller vessels.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm



PUBLIC FORECAST: DRP AVIATION: Murdock MARINE: Canepa

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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 W 6 G 13 58°F 66°F1017.6 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi53 min WSW 7 G 13 59°F 1016.6 hPa
PXSC1 3 mi53 min 60°F 60°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi53 min W 11 G 15
OBXC1 6 mi53 min 60°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi53 min W 8 G 12 59°F 1017.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi53 min W 1.9 G 2.9 60°F 1017.9 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi53 min W 6 G 8.9 60°F 67°F1018.1 hPa
LNDC1 9 mi53 min W 6 G 8 60°F 1017.7 hPa
46237 - San Francisco Bar, CA (142) 11 mi47 min 58°F 61°F5 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi53 min WSW 9.9 G 14 60°F 1016.8 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi37 min W 7.8 G 9.7 59°F1018.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi53 min SW 8 G 12 59°F 67°F1017.1 hPa
RTYC1 - 9414523 - Redwood City, CA 25 mi53 min W 5.1 G 6 59°F 1018.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi53 min SW 7 G 8.9 57°F 67°F1016.8 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi53 min 61°F1017.8 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi53 min WNW 11 G 15 59°F 1016 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi62 min W 15 58°F 1017 hPa53°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi37 min NW 7.8 G 9.7 58°F 1018.6 hPa57°F
BDXC1 47 mi41 min 60°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA15 mi54 minW 910.00 miOvercast61°F54°F78%1017.7 hPa
San Francisco, San Francisco International Airport, CA15 mi51 minW 810.00 miMostly Cloudy60°F54°F80%1017.5 hPa
Hayward, Hayward Air Terminal, CA21 mi53 minW 510.00 miOvercast60°F53°F78%1018.5 hPa
Half Moon Bay Airport, CA22 mi52 minNNW 36.00 miFog/Mist57°F54°F88%1017.9 hPa
Concord, Buchanan Field, CA23 mi54 minS 810.00 miFair59°F52°F78%1015.5 hPa
San Carlos Airport, CA23 mi52 minN 010.00 miFair57°F52°F82%1018.3 hPa
Novato / Gnoss Field, CA23 mi72 minN 010.00 miPartly Cloudy59°F54°F82%1016.9 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW6SW7W5W7W6W8W6W8W6SW7W13W11W13W16W19W19W18W16W15W11W13SW6W10W8
1 day agoNW5W5W4CalmW4S3SE4W3NW7NW9NW9NW9NW13NW17NW17W18W17W15W12W10W12W14W11W9
2 days agoW5W8NW9W8NW11NW12W10W7NW7NW6NW7NW11NW11NW15NW18NW20NW18
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Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Mon -- 06:00 AM PDT     4.01 feet High Tide
Mon -- 07:02 AM PDT     Sunrise
Mon -- 10:23 AM PDT     3.29 feet Low Tide
Mon -- 01:28 PM PDT     Moonset
Mon -- 04:16 PM PDT     5.14 feet High Tide
Mon -- 06:58 PM PDT     Sunset
Mon -- 10:58 PM PDT     Moonrise
Mon -- 11:34 PM PDT     0.88 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.82.433.63.943.93.73.43.33.33.644.44.95.154.63.82.921.30.9

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Mon -- 12:08 AM PDT     0.00 knots Slack
Mon -- 03:10 AM PDT     1.87 knots Max Flood
Mon -- 07:00 AM PDT     -0.00 knots Slack
Mon -- 07:02 AM PDT     Sunrise
Mon -- 08:59 AM PDT     -0.92 knots Max Ebb
Mon -- 11:53 AM PDT     0.00 knots Slack
Mon -- 01:28 PM PDT     Moonset
Mon -- 02:51 PM PDT     1.15 knots Max Flood
Mon -- 05:45 PM PDT     -0.00 knots Slack
Mon -- 06:58 PM PDT     Sunset
Mon -- 09:15 PM PDT     -1.96 knots Max Ebb
Mon -- 10:58 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.10.81.61.91.81.40.8-0-0.7-0.9-0.7-0.300.511.10.90.5-0.1-0.8-1.5-1.9-1.8-1.3

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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