Thursday, April22, 2021
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Marine Weather and Tides
Santa Clara, 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 7:50PM Thursday April 22, 2021 7:22 PM PDT (02:22 UTC) Moonrise 1:53PMMoonset 3:08AM 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 Santa Clara, CA
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location: 37.38, -121.9     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
RTYC1 - 9414523 - Redwood City, CA 19 mi52 min W 14 G 21 52°F 1015.1 hPa
46269 32 mi52 min 51°F 54°F4 ft
AAMC1 - 9414750 - Alameda, CA 34 mi52 min W 11 G 14 51°F 62°F1014.8 hPa
LNDC1 35 mi52 min W 8 G 13 51°F 1014.4 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 37 mi52 min WSW 16 G 18
OBXC1 37 mi52 min 51°F 48°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 38 mi52 min W 12 G 16 51°F 1014.3 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 39 mi52 min WSW 8 G 16 50°F 1013.3 hPa
PXSC1 39 mi52 min 51°F 51°F
ELXC1 - Elkhorn Slough Reserve, CA 40 mi97 min W 7 51°F 1018 hPa48°F
MLSC1 - Moss Landing, South Harbor, CA 40 mi36 min 54°F
FTPC1 - 9414290 - San Francisco, CA 42 mi52 min W 7 G 13 50°F 56°F1014.1 hPa
46092 - MBM1 44 mi76 min W 7.8 50°F 51°F1015.1 hPa (-1.2)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi52 min SW 16 G 21 52°F 1014 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 46 mi71 min SSW 7 50°F 1014 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi52 min SSW 6 G 11 52°F 58°F1013.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 46 mi52 min W 15 G 29 55°F 1011.6 hPa
UPBC1 47 mi52 min WSW 17 G 22
PCOC1 - 9415144 - Port Chicago, CA 47 mi52 min SW 14 G 21 52°F 62°F1012.6 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 47 mi52 min WSW 13 G 18 53°F 61°F1013 hPa
46237 - San Francisco Bar, CA (142) 48 mi52 min 52°F5 ft
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi42 min NW 12 G 18 51°F 52°F1015.4 hPa48°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA2 mi29 minNNW 1810.00 miA Few Clouds and Breezy55°F45°F69%1013.9 hPa
San Jose / Reid / Hillv, CA5 mi35 minNNW 1210.00 miClear57°F46°F67%1013.9 hPa
San Carlos Airport, CA21 mi95 minW 16 G 2210.00 miMostly Cloudy57°F45°F63%1014.6 hPa
Hayward, Hayward Air Terminal, CA23 mi28 minW 1010.00 miOvercast52°F44°F75%1015.5 hPa
Livermore, Livermore Municipal Airport, CA23 mi29 minW 1910.00 miFair and Breezy51°F44°F77%1013.3 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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Last 24hrN11N8N3N3CalmE4SE9SE10SE12SE11SE8SE9SE10S10SE9SE9Calm3NW13NW14N13NW17NW16NW18
1 day agoW11W4CalmS5S7S7SE10S9S7S8S5S3S6SE9SE7SE8E5E3NW10NW11NW13
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2 days agoN7N9CalmNW5N4CalmCalmS4S4SE7S6S5S5S8S54CalmNW7NW10W15W14
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Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
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Thu -- 04:08 AM PDT     Moonset
Thu -- 04:56 AM PDT     2.67 feet Low Tide
Thu -- 06:23 AM PDT     Sunrise
Thu -- 09:11 AM PDT     7.96 feet High Tide
Thu -- 02:53 PM PDT     Moonrise
Thu -- 05:06 PM PDT     0.04 feet Low Tide
Thu -- 07:49 PM PDT     Sunset
Thu -- 10:59 PM PDT     8.19 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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75.94.73.62.92.73.45.16.97.97.87.15.94.32.71.40.400.523.967.68.2

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
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Thu -- 02:16 AM PDT     -0.65 knots Max Ebb
Thu -- 04:09 AM PDT     Moonset
Thu -- 04:40 AM PDT     0.00 knots Slack
Thu -- 06:23 AM PDT     Sunrise
Thu -- 07:00 AM PDT     0.81 knots Max Flood
Thu -- 09:46 AM PDT     -0.01 knots Slack
Thu -- 02:21 PM PDT     -1.13 knots Max Ebb
Thu -- 02:53 PM PDT     Moonrise
Thu -- 05:00 PM PDT     0.00 knots Slack
Thu -- 07:48 PM PDT     1.36 knots Max Flood
Thu -- 07:50 PM PDT     Sunset
Thu -- 11:03 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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-0.4-0.6-0.7-0.6-0.30.20.60.80.70.4-0.1-0.4-0.7-1-1.1-1-0.6-00.71.21.41.20.70

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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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