Thursday, April22, 2021
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Marine Weather and Tides
San Lorenzo, 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 6:21AMSunset 7:52PM Thursday April 22, 2021 7:32 PM PDT (02:32 UTC) Moonrise 1:54PMMoonset 3:10AM Illumination 85% Phase: Waxing Gibbous; Moon at 11 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 241 Pm Pdt Thu Apr 22 2021
Today..W winds 5 to 15 kt.
Tonight..SW winds 5 to 15 kt.
Fri..SW winds 5 to 15 kt.
Fri night..W winds 5 to 15 kt.
Sat..W winds 5 to 10 kt.
Sat night..SW winds 5 to 10 kt. Rain.
Sun..SW winds 5 to 15 kt. Rain.
Mon..W winds 5 to 15 kt.
PZZ500 241 Pm Pdt Thu Apr 22 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds remain moderate over the northern outermost waters. These locally stronger winds will generate hazardous conditions for small craft vessels. A moderate locally generated northwest swell will prevail through the end of the week. A building southerly swell will move through the waters alongside the chance for rain this coming weekend. Locally gusty winds will accompany these cold front as it sweeps through the waters early Sunday.


7 Day Forecast for Marine Location Near San Lorenzo, CA
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location: 37.65, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 230009 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 509 PM PDT Thu Apr 22 2021

SYNOPSIS. Mainly dry and seasonable weather conditions will persist through Friday night with periods of night and morning low clouds. Cooling will occur on Saturday as onshore flow and cloud cover increases region-wide ahead of an approaching weather system. Widespread rainfall is likely on Sunday into early Monday as a cold front drops southward across the region. Warming and drying trend is then expected beyond Monday.

DISCUSSION. as of 01:36 PM PDT Thursday . Marine stratus is holding on strong over the North Bay this afternoon with KSTS (Santa Rosa) as much as 14 deg F cooler compared to this time yesterday. Thus, have lowered maximum temperatures for the remainder of the day where onshore flow and low clouds remain in place. Cool, cloudy conditions also persist at the coast with temperatures warming into the 60s to lower 70s across the sunny interior at this hour.

The marine layer should compress slightly during the next 24 hours with less of an inland push of stratus overnight. However, still expecting much of the region to see night/morning low clouds with temperatures ranging from the 40s to lower 50s through early Friday morning. Only expecting subtle changes to the weather on Friday with morning clouds dissipating across the interior while a modest marine layer will maintain mostly cloudy conditions near the coast. Temperatures too will change little with mid/upper 50s at the coast to lower 70s inland.

Saturday will be a transition day with an increase in cloud cover and onshore flow ahead of an approaching weather system. This will bring temperatures down into the 60s even across much of the interior while 50s will be common near the coast. The latest thinking is that light precipitation may develop late Saturday near the coast as moisture advects inland while a majority of the region remains dry.

A cold front will then drop into the North Bay predawn hours on Sunday before progressing southward/inland through the day. This will provide generally light to occasionally moderate rainfall along the frontal boundary with the potential for lingering rain showers in wake of the frontal passage. Additionally, cannot rule out an isolated thunderstorm or two over the North Bay as instability increases as the main mid/upper level low drops into northern California. Latest ensembles continue to indicate rainfall totals from this system to range from 0.50"-1.00" for the North Bay hills /Santa Cruz Mountains, 0.25"-0.50" around SF Bay/Peninsula/North Bay valleys and 0.10"-0.25" for the interior East/South Bay valleys. Cooler temperatures are also likely region-wide on Sunday with daytime highs only reaching into the 50s and colder air advects southward.

Conditions will begin to dry out late Sunday night into Monday morning along with cooler temperatures, generally in the 40s region- wide. While a lingering shower or two may be possible through midday Monday, most precipitation will have exited our region to the east. A very gradual warming trend is expected through the remainder of next week as high pressure develops over the region.

AVIATION. As of 05:10 PM PDT Thursday . For the 00Z TAFs. Weather pattern features low pressure exiting the region and being replaced by a highly amplified ridge. The marine layer deepened significantly under the exiting trough and has brought MVFR to coastally influenced TAF sites through the day. Latest satellite imagery shows a healthy upstream feed with continued deep onshore advection of the stratus through SSW to NNE coastal gaps. Coastal surface eddies have also complicated the forecasting of the onshore advection of the stratus and model data is no longer aligned with observations thus generally low to medium confidence on marine layer coverage and timings. That said, building high pressure will compressed the marine layer tonight into tomorrow morning and limit the coverage of the stratus deck while lowering ceilings closer to the IFR level, especially near the coast. Rather breezy onshore winds of 14 to 22kt are possible through the remainder of the evening and will gradually taper off overnight. For tomorrow morning, a compressed yet stubborn marine layer will be present once again along the coast and through coastal gaps. Continued onshore flow through the day with advancing high clouds ahead of the next storm system arriving late Saturday night.

Vicinity of KSFO . MVFR with rather breezy onshore winds this evening. Satellite trends have been to shift the thick SF peninsula feed southward over the terminal, thus expecting BKN-OVC MVFR cigs to persist through the remainder of the day before lowering down to borderline MVFR/IFR level overnight due to the influence of the ridge. Patchy cigs will linger through midday tomorrow as HREF ensemble suggests KSFO will once again be on the edge of a stratus feed tomorrow.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR OVC cigs with a very robust onshore feed through the remainder of the day. Satellite imagery does show some thinning out of the lower levels of the marine stratus deck early this evening but the mid/top level stratus deck continues to push onshore unimpeded. For tonight, the influence of the ridge will compress the marine layer and force ceilings down to the IFR range through the middle of the night. Steady onshore flow and upstream stratus feed will bring MVFR cigs throughout the day tomorrow, though could see some brief midday clearing.

MARINE. as of 04:59 PM PDT Thursday . Northwest winds remain moderate over the northern outermost waters. These locally stronger winds will generate hazardous conditions for small craft vessels. A moderate locally generated northwest swell will prevail through the end of the week. A building southerly swell will move through the waters alongside the chance for rain this coming weekend. Locally gusty winds will accompany these cold front as it sweeps through the waters early Sunday.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . SF Bay until 9 PM



PUBLIC FORECAST: RGass AVIATION: DRP MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 9 mi45 min W 6 G 9.9 51°F 62°F1014.8 hPa
RTYC1 - 9414523 - Redwood City, CA 10 mi45 min W 18 G 22 51°F 1015.2 hPa
LNDC1 11 mi45 min W 9.9 G 14 51°F 1014.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 12 mi45 min W 14 G 19
OBXC1 12 mi45 min 50°F 48°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 13 mi45 min WSW 5.1 G 12 50°F 1014.4 hPa
PXSC1 14 mi45 min 51°F 51°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi45 min WSW 9.9 G 18 50°F 1013.2 hPa
FTPC1 - 9414290 - San Francisco, CA 17 mi45 min WSW 7 G 15 50°F 56°F1014.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 19 mi45 min SW 14 G 19 52°F 1013.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 21 mi52 min SSW 5.1 50°F 1014 hPa
RCMC1 - 9414863 - Richmond, CA 21 mi45 min SSW 6 G 12
46237 - San Francisco Bar, CA (142) 24 mi63 min 52°F5 ft
UPBC1 27 mi45 min WSW 15 G 21
MZXC1 - 9415102 - Martinez-Amorco CA 27 mi45 min SW 12 G 16 52°F 61°F1013 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 28 mi45 min W 13 G 19 53°F 1012.8 hPa
CQUC1 29 mi44 min 62°F
PCOC1 - 9415144 - Port Chicago, CA 30 mi45 min SW 17 G 21 52°F 62°F1012.4 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 32 mi45 min WNW 18 G 25 54°F 1011.4 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi33 min WNW 14 G 18 49°F1015.1 hPa (-1.0)
SFXC1 - San Francisco Bay Reserve, CA 39 mi108 min W 14 59°F 1012 hPa47°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi33 min NW 12 G 16 49°F 1015.7 hPa46°F
PRYC1 - 9415020 - Point Reyes, CA 47 mi45 min 50°F1014.5 hPa

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA3 mi40 minW 128.00 miOvercast52°F45°F77%1014.7 hPa
Hayward, Hayward Air Terminal, CA5 mi39 minW 1010.00 miOvercast52°F44°F75%1015.5 hPa
San Carlos Airport, CA8 mi1.8 hrsW 16 G 2210.00 miMostly Cloudy57°F45°F63%1014.6 hPa
San Francisco, San Francisco International Airport, CA8 mi37 minW 12 G 1810.00 miMostly Cloudy53°F44°F72%1014.5 hPa
Half Moon Bay Airport, CA18 mi38 minWNW 72.50 miFog/Mist48°F45°F87%1015.6 hPa
Livermore, Livermore Municipal Airport, CA21 mi40 minW 1910.00 miFair and Breezy51°F44°F77%1013.3 hPa

Link to 5 minute data for KOAK

Wind History from OAK (wind in knots)
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1 day agoW8SW3S14S9S9S13SW9S8SW8S5SW7SW8SW6S5SW6W4NW8W8NW12W14W12W13W14W10
2 days agoW13W13SW14CalmSW4W15W11SW11W12SW10W13W12S8SW5SW11SW11SW11SW14W18W21
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Tide / Current Tables for San Mateo Bridge (east end), San Francisco Bay, California
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San Mateo Bridge (east end)
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Thu -- 03:48 AM PDT     2.52 feet Low Tide
Thu -- 04:09 AM PDT     Moonset
Thu -- 06:23 AM PDT     Sunrise
Thu -- 08:51 AM PDT     6.59 feet High Tide
Thu -- 02:54 PM PDT     Moonrise
Thu -- 03:58 PM PDT     0.04 feet Low Tide
Thu -- 07:51 PM PDT     Sunset
Thu -- 10:39 PM PDT     6.73 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.44.43.42.72.534.15.36.36.66.25.342.51.20.300.41.52.84.45.76.66.7

Tide / Current Tables for Little Coyote Pt 3.4 mi NNE, South San Francisco Bay, California Current
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Little Coyote Pt 3.4 mi NNE
Click for Map
Thu -- 12:19 AM PDT     -0.44 knots Max Ebb
Thu -- 03:35 AM PDT     0.00 knots Slack
Thu -- 04:10 AM PDT     Moonset
Thu -- 06:12 AM PDT     0.41 knots Max Flood
Thu -- 06:23 AM PDT     Sunrise
Thu -- 08:56 AM PDT     -0.01 knots Slack
Thu -- 12:24 PM PDT     -0.75 knots Max Ebb
Thu -- 02:54 PM PDT     Moonrise
Thu -- 03:55 PM PDT     0.00 knots Slack
Thu -- 07:00 PM PDT     0.68 knots Max Flood
Thu -- 07:51 PM PDT     Sunset
Thu -- 10:13 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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-0.4-0.4-0.3-0.10.10.30.40.40.2-0-0.3-0.6-0.7-0.7-0.6-0.300.40.60.70.60.40.1-0.3

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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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