Monday, March1, 2021
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Marine Weather and Tides
Belvedere, CA

Version 3.4
NOTICE
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 6:38AMSunset 6:04PM Monday March 1, 2021 5:59 PM PST (01:59 UTC) Moonrise 9:05PMMoonset 8:21AM Illumination 88% Phase: Waning Gibbous; Moon at 18 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- 246 Pm Pst Mon Mar 1 2021
Rest of today..SW winds 5 to 10 kt.
Tonight..NW winds up to 10 kt.
Tue..W winds 5 to 15 kt.
Tue night..NW winds 5 to 15 kt.
Wed..SW winds 5 to 15 kt.
Wed night..SW winds 10 to 20 kt with gusts up to 25 kt.
Thu..SW winds 5 to 15 kt.
Fri..SW winds up to 10 kt. Rain likely.
PZZ500 246 Pm Pst Mon Mar 1 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Southerly flow continues, generally light winds except for breezy to locally gusty conditions between point sur to point pinos this afternoon and evening. Winds will generally remain light this week as a system passes to our south. Northwest swell prevails through the week.


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 012334 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 334 PM PST Mon Mar 1 2021

SYNOPSIS. Dry and mild weather conditions are forecast to persist across the region through most of the work week ahead. Rain chances develop by late in the week or by the early part of next weekend.

DISCUSSION. as of 02:00 PM PST Monday . GOES-WEST geocolor imagery picking up on faint clouds over the Monterey Bay Peninsula slowly fading away as a deepening cutoff low tracks south and parallel to the California Coast and is evident by mid-level clouds quickly traveling southward at ~140W. This is in stark contrast to the clear skies over nearly the entire State this afternoon, with well-defined snowpack evident all across the Intermountain West from the Sierra to the Wasatch Range. Zooming in on the forecast area, southerly flow has picked up along the coast since dawn owing to the influence from the offshore low. Have also observed some breezy southerly winds at higher elevations this afternoon as a result. Nonetheless, winds will remain light to occasionally breezy at times across the region, with onshore southerly flow promoting cooler temps than in recent days along south-facing portions of the coast this afternoon.

The cutoff low is progged to eventually track towards the southeast over the next couple of days as evidenced by the latest short and mid-range deterministic models. That being said, high confidence for Tuesday and Wednesday that staying well offshore during its passage over our coastal waters, so are not expecting any moisture returns from it. Given recent SREF mean solutions, looking like the bulk of the moisture associated with this system will come ashore over SoCal while its northernmost returns will still, at their closest extent to our CWA, only make it up to extreme southern Monterey County if that. Despite this miss, will be observing cooler, onshore flow through Thursday that will make for max temps along the coast that will be running around the upper-50s to low 60s F, while areas along the Bay Shoreline will max out around the upper- 60s F. Interior valleys will generally break into the low 70s during that timespan as well. Given the lack of cloud cover over the next few days, are expecting overnight radiational cooling to make for cool starts in the low to mid-30s F across the interior valleys with the potential for patchy frost as well.

The upper-level ridge has quickly retrograded towards the northcentral PAC and its axis will continue to track towards Japan through Thursday, leaving an increasingly favorable environment for upper-level troughing to develop across the East Pacific. Following the passage of this cutoff low, upper-level wave energy from the northwest Pacific will transfer into the environment, allowing for an amplification of a low pressure system that will center itself right along ~140W. Increasing confidence regarding the amplification of the upper-level trough, with EC, C, and GFS ensemble members leaning towards our area being within the divergent quadrant of the trough and in the path of the subsequent frontal passage that will occur as the system gradually comes ashore over the weekend. Disagreements lie predominantly with the timing of the initial rain bands and the max intensity of the trough between Friday and Sunday. EC members are leaning towards the amplification of the trough occuring closer to the Coast, which would allow for the system to tap into subtropical moisture more easily and produce slightly higher rainfall rates and totals than what some of the GFS and C members are leaning towards. For now, looking like the earliest the rain band would roll in to the region would be around Friday afternoon, predominantly over the North Bay Coastal Ranges, before gradually moving towards the southeast and across the rest of the CWA through Saturday morning and into Saturday afternoon. Preliminary rainfall totals from this event are ranging from a tenth to a quarter of an inch across the CWA with the highest totals likely along the coastal ranges at around half an inch. Nonetheless, still several days out and owing to the uncertainties, are sure to get a better handle on what those totals will likely wind up being as we get closer to the event.

The shift towards a wet pattern across the Eastern Pacific is coinciding with the negative PNA being observed this week. EC weeklies heavily leaning towards a negative trend at least through the first half of this month, which is promising for the region. Stay tuned.

AVIATION. as of 03:32 PM PST Monday . For the 00Z TAFs. Clear skies for VFR around the Bay Area and the Central Coast. A patch of stratus lingers off the coast, but consistent southerly flow over the ocean keeps the risk of low clouds out of the TAF. Southerly winds remain breezy at this hour, with a few stronger gusts at KLVK and KSJC. Winds are expected to diminish as the sunsets to be light and variable. High clouds creep into the region Tuesday, but remains VFR through the TAF. Winds will switch back to the NW tomorrow and be breezy and a new air mass approaches the coast. Vicinity of KSFO . Southerly winds remain breezy, but are expected to subside after 03Z. Skies will remain SKC-FEW200 tonight, with increasing high clouds Tuesday. Winds will return to the NW tomorrow, and become breezy. SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR with light to breezy winds. Winds will be light overnight becoming breezy Tuesday afternoon. High clouds increase throughout the day tomorrow, but remain aloft.

MARINE. as of 02:46 PM PST Monday . Southerly flow continues, generally light winds except for breezy to locally gusty conditions between Point Sur to Point Pinos this afternoon and evening. Winds will generally remain light this week as a system passes to our south. Northwest swell prevails through the week.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. None.

PUBLIC FORECAST: Diaz AVIATION: DK MARINE: Bingaman

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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 mi66 min WSW 8 G 13 57°F 53°F1017.2 hPa
PXSC1 3 mi66 min 62°F 33°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 3 mi66 min WSW 5.1 G 6 61°F 1016.1 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 4 mi79 min SSW 1.9 61°F 1017 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 6 mi66 min NW 7 G 8.9
OBXC1 6 mi66 min 57°F 39°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 6 mi66 min NW 8.9 G 9.9 56°F 1017 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 7 mi66 min W 7 G 8.9 61°F 1017.5 hPa
RCMC1 - 9414863 - Richmond, CA 7 mi66 min S 1.9 G 2.9 61°F 55°F1017.3 hPa
AAMC1 - 9414750 - Alameda, CA 8 mi66 min NNW 4.1 G 7 62°F 55°F1017.2 hPa
LNDC1 9 mi66 min NNW 7 G 8.9 61°F 1017 hPa
46237 - San Francisco Bar, CA (142) 11 mi60 min 51°F4 ft
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 18 mi66 min WNW 4.1 G 6 60°F 1016.8 hPa
CQUC1 20 mi77 min 55°F
UPBC1 22 mi66 min NNE 6 G 11
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi40 min Calm G 3.9 51°F1018.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi66 min NW 13 G 14 62°F 55°F1017.1 hPa
RTYC1 - 9414523 - Redwood City, CA 25 mi66 min N 2.9 G 5.1 65°F 59°F1017.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 26 mi66 min NNW 8.9 G 8.9 62°F 56°F1016.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 31 mi66 min 50°F1017.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi66 min NNW 8 G 8.9 65°F 1016.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 34 mi75 min NW 7 66°F 1018 hPa33°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi40 min SSE 3.9 G 5.8 49°F 1017.9 hPa45°F
BDXC1 47 mi54 min 51°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 mi67 minNW 710.00 miA Few Clouds67°F36°F32%1017.1 hPa
San Francisco, San Francisco International Airport, CA15 mi64 minN 010.00 miFair67°F32°F27%1016.6 hPa
Hayward, Hayward Air Terminal, CA21 mi66 minSSW 510.00 miFair67°F24°F20%1017.5 hPa
Half Moon Bay Airport, CA22 mi65 minSSE 69.00 miFair57°F34°F41%1017.6 hPa
Concord, Buchanan Field, CA23 mi67 minno data10.00 miFair66°F34°F30%1015.6 hPa
San Carlos Airport, CA23 mi73 minS 810.00 miClear68°F16°F13%1016.9 hPa
Novato / Gnoss Field, CA23 mi85 minS 1010.00 miFair66°F16°F14%1017.3 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW12W12W12W8W6S4CalmCalmCalmSW3NW3W3W3W7CalmN3SW9E5NE9NE96S17NE8Calm
1 day agoW17W17NW10W8W9W8W5W6CalmN5CalmNE6CalmW3N6NE6E7CalmNW3N4N3N4--W17
2 days agoW25
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Tide / Current Tables for Alcatraz Island, San Francisco Bay, California
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Alcatraz Island
Click for Map
Mon -- 01:17 AM PST     5.70 feet High Tide
Mon -- 06:40 AM PST     Sunrise
Mon -- 06:54 AM PST     1.13 feet Low Tide
Mon -- 08:21 AM PST     Moonset
Mon -- 01:06 PM PST     5.74 feet High Tide
Mon -- 06:03 PM PST     Sunset
Mon -- 07:11 PM PST     0.29 feet Low Tide
Mon -- 09:05 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.15.75.54.73.52.31.41.11.52.43.44.55.45.75.54.63.31.90.80.30.51.32.43.7

Tide / Current Tables for Alcatraz Island W, San Francisco Bay, California Current
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Alcatraz Island W
Click for Map
Mon -- 02:35 AM PST     -0.00 knots Slack
Mon -- 05:15 AM PST     -2.36 knots Max Ebb
Mon -- 06:40 AM PST     Sunrise
Mon -- 08:18 AM PST     0.00 knots Slack
Mon -- 08:21 AM PST     Moonset
Mon -- 11:20 AM PST     2.80 knots Max Flood
Mon -- 02:39 PM PST     -0.00 knots Slack
Mon -- 05:33 PM PST     -2.59 knots Max Ebb
Mon -- 06:03 PM PST     Sunset
Mon -- 08:43 PM PST     0.00 knots Slack
Mon -- 09:05 PM PST     Moonrise
Mon -- 11:46 PM PST     2.89 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.920.8-0.5-1.7-2.3-2.1-1.3-0.30.92.12.82.720.9-0.4-1.6-2.5-2.5-1.8-0.80.41.72.6

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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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