Thursday, March4, 2021
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Marine Weather and Tides
Mountain View, 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 6:33AMSunset 6:06PM Thursday March 4, 2021 1:18 PM PST (21:18 UTC) Moonrise 12:00AMMoonset 10:00AM Illumination 64% 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 416 Am Pst Thu Mar 4 2021
Today..NE winds around 5 kt, becoming nw this afternoon.
Tonight..W winds up to 10 kt.
Fri..SE winds up to 10 kt.
Fri night..SW winds 5 to 15 kt. Rain.
Sat..NW winds up to 10 kt. A slight chance of rain.
Sat night..NW winds 5 to 15 kt.
Sun..W winds up to 10 kt.
Mon..SW winds 5 to 10 kt. Rain.
PZZ500 416 Am Pst Thu Mar 4 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty south to southeast winds developing over much of the coastal waters today into Friday. A long period northwest swell arrives today through Friday. A low pressure system from the northwest will bring rain later Friday into Saturday morning. Another low pressure system from the northwest will bring more rain early to mid next week.


7 Day Forecast for Marine Location Near Mountain View, CA
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location: 37.45, -122.06     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 041733 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 933 AM PST Thu Mar 4 2021

SYNOPSIS. Seasonal temperatures and light southwest winds through Friday. Our next chance for rain moves over the area Friday night into early Saturday morning. Rain totals do not look impressive, as the system will move over the area too fast for much to accumulate. Temperatures will remain cool this weekend and onshore winds breezy Saturday, becoming light Sunday. More chances for rain remaining in the forecast for early next week, keeping temperatures cooler than normal.

DISCUSSION. as of 8:30 AM PST Thursday . Visible imagery shows a fractured marine stratus deck extending from the Sonoma- Mendocino county line SSW along the Pacific coast through Cambria in coastal SLO county. As a result, sunrise skies range from completely clear for those inland, to partly cloudy along the bayshores and marine influenced valleys, to overcast conditions in portions of the North Bay. These low clouds will mix out by 10AM, but a band of higher level clouds is expected to arrive from the NW through the day ahead of an approaching storm system.

Models are in good agreement that the approaching system will bring bring a quick shot of precipitation to the region late day tomorrow (Friday) into early Saturday, with some weaker showers lingering as late as midday Saturday. Precipitation totals will be predominately light with brief localized moderate rain rates possible with the frontal passage. The next storm system precipitation is expected to be beneficial with minimal impacts beyond slick roadways expected as amounts and rain rates are well below criteria for burn scar/slide/flash flooding concerns. Precipitation amounts will range from 0.25 to 0.50" for the immediate Bay Area and North Bay, up to 0.75" in the for the coastal ranges/hills, and less than 0.25" south of the Santa Cruz mountains. Southwest winds of 10-20mph with gusts to 25-30mph at the coast and higher terrain will accompany the arrival of this system weaker winds prevail elsewhere. Winds will become northwest in the wake of the front and become locally breezy along the coast by Saturday afternoon and relatively light elsewhere.

By next week, ensemble members are in high agreement that wetter and cooler weather will impact the region from Monday through Wednesday. By late week next week in the wake of these wetter and cooler system, model uncertainty increases significantly, but there is some indication of a potential northerly/offshore wind event-- though given the anticipated rains, impacts will likely be low.

The primary forecast challenge of the day shift will initially be to tweak the parameters of tomorrow's quick moving system, but most focus will likely be on honing in some of the potentially lower temperatures, lower snow levels, precipitation amounts, and potential impacts of the colder, wetter systems expected early next week.

For more details on the current forecast, please refer to the previous discussion.

DISCUSSION. as of 3:42 AM PST Thursday . Satellite this morning shows patchy stratus moving inland. This will give most of the area a few low clouds as the sun begins to rise this morning. Thursday and Friday will be mostly mild, with temperatures a couple of degrees warmer than seasonal in higher terrain and the south eastern parts of the CWA. Southerly winds will be light to breezy as another upper level system approaches from the northwest, giving the area a chance for rain late Friday night.

An upper level trough has been, and will continue to, dominate the east Pacific through the end of the week. This deeper trough has been able to tap into some subtropical moisture, advecting healthy PW values upwards of 0.8" to the northern latitudes. For our area, these PW values are in the 90th percentile for this time of year (which means there is sufficient moisture for some rain to fall). However, models are in good agreement that this system will be moving a cold front through the area fast (in about 12 hours). The system is forecasted to be about 350 miles off the coast Friday, where it stalls and deepens. It then continues eastward and moves onshore Friday night, giving the North Bay areas some lower clouds and light rain starting around sunset. The system will continue to move quickly across the CWA from northwest to southeast, brining rain to most areas early Saturday morning. The cold front should be moving out of the southern parts of Monterey and San Benito counties Saturday morning. Rainfall totals look to be around 0.50"-0.75" for the coastal ranges/hills, 0.25"-0.50" for immediate Bay Area and North Bay, with 0.25" or less elsewhere. Some places might only see 0.10".

This weekend temperatures will have a hard time recovering as we see zonal flow aloft. Near the coast will see upper 50's and the inland areas lower 60's for high temperatures Saturday and Sunday. Northwest winds will remain breezy, with more gusty winds near the coast. Winds will look to calm down slightly Sunday.

Most global models agree on more upper level waves coming our way early next week. As an upper level trough persists over the eastern Pacific for most of next week, more moisture continues to advect northward ahead of a few low pressure systems that look to move along the storm track. This pattern would keep the area cooler than normal, and bring us some more rain potential. We will keep an eye on how things evolve for the coming week.

AVIATION. as of 09:30 AM PST Thursday . For the 18Z TAFs. Lingering cigs at KSTS will continue to thin out late this morning. VFR expected this afternoon and this evening at all terminals. Tonight on the other hand is tricky and lower confidence forecast. Hi-res model guidance suggests a return of some patchy low cigs in the MVFR cat. For now brought some cigs back for the North Bay and Monterey Bay. SF Bay could see some clouds, but will keep them SCT. Tomorrow afternoon into the evening more widespread cloud cover will return as a cold front moves in from the west. Vicinity of KSFO . VFR. Wind light and variable until 22z today then southwest 10 to 20 knots, wind decreasing to south-southwest 10 knots tonight and Friday morning. Scattered clouds possible tomorrow morning with increase mid-high level clouds in the afternoon/evening. SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR through early tonight. MVFR cigs late tonight and early tomorrow. Confidence on returning cigs is medium.

BEACHES. as of 4:19 AM PST Thursday . A long period northwest swell arrives today through Friday bringing an increased risk of sneaker waves, rip currents, long shore currents, and there could be hard breaking surf on steep beaches. There is the potential that these conditions will transition into high surf on Friday. The hazard is for west and northwest facing beaches where caution is advised. Never turn your back to the ocean.

MARINE. as of 09:27 AM PST Thursday . A cold front will approach the region today resulting in increasing southerly winds over the coastal waters. Winds will be strongest north of Point Reyes. A long period northwest swell arrives today continue into Friday. The passing cold front will bring rain later Friday into Saturday morning. Another low pressure system from the northwest will bring more rain early to mid next week.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm from 3 PM



PUBLIC FORECAST: DRP/Dhuyvetter AVIATION: MM MARINE: MM

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 9 mi48 min NNW 7 G 11 55°F 59°F1025.1 hPa
AAMC1 - 9414750 - Alameda, CA 26 mi48 min W 4.1 G 6 56°F 55°F1024.8 hPa
LNDC1 27 mi48 min NNW 5.1 G 7 55°F 1024.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 28 mi48 min WNW 6 G 8.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 29 mi48 min NW 8 G 12 53°F 1024.6 hPa
OBXC1 29 mi48 min 54°F 46°F
PXSC1 30 mi48 min 56°F 46°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 30 mi48 min WSW 6 G 12 57°F 1023.7 hPa
FTPC1 - 9414290 - San Francisco, CA 33 mi48 min W 8 G 13 53°F 55°F1024.8 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 35 mi48 min SW 12 G 14 54°F 1025 hPa
46269 36 mi48 min 53°F 54°F4 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 37 mi37 min SW 5.1 54°F 1024 hPa
46237 - San Francisco Bar, CA (142) 38 mi48 min 53°F4 ft
RCMC1 - 9414863 - Richmond, CA 38 mi48 min S 6 G 8.9 54°F 55°F1024.8 hPa
UPBC1 41 mi48 min NW 9.9 G 12
MZXC1 - 9415102 - Martinez-Amorco CA 41 mi48 min NW 12 G 13 55°F 55°F1024.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 42 mi48 min W 8 G 8.9 56°F 55°F1024 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 42 mi48 min ENE 5.1 G 5.1 56°F 1024 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 43 mi48 min W 8 G 12 55°F 1024.3 hPa
CQUC1 44 mi29 min 55°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi28 min SSE 9.7 G 12 49°F 6 ft1025.2 hPa46°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 46 mi28 min SSE 7.8 G 9.7 51°F5 ft1025.1 hPa
MLSC1 - Moss Landing, South Harbor, CA 47 mi18 min 54°F
ELXC1 - Elkhorn Slough Reserve, CA 47 mi93 min N 7 56°F 1025 hPa47°F
46092 - MBM1 48 mi81 min NNE 3.9 51°F 53°F1024.7 hPa (+0.8)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 49 mi28 min S 5.8 G 9.7 53°F 53°F7 ft1025 hPa46°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mountain View, Moffett Field, CA1 mi28 minVar 6 G 1210.00 miFair59°F43°F55%1024 hPa
Palo Alto Airport, CA4 mi31 minN 810.00 miClear59°F45°F59%1024 hPa
San Jose, San Jose International Airport, CA9 mi25 minNNW 510.00 miA Few Clouds63°F39°F41%1023.7 hPa
San Carlos Airport, CA11 mi23 minNNE 610.00 miClear57°F46°F67%1024 hPa
Hayward, Hayward Air Terminal, CA15 mi24 minVar 310.00 miFair60°F41°F50%1024.9 hPa
San Jose / Reid / Hillv, CA15 mi31 minWNW 610.00 miClear63°F39°F42%1024 hPa
Oakland, Metro Oakland International Airport, CA19 mi25 minNNW 610.00 miA Few Clouds63°F44°F50%1024.3 hPa
San Francisco, San Francisco International Airport, CA20 mi22 minNE 810.00 miA Few Clouds60°F46°F60%1024 hPa
Livermore, Livermore Municipal Airport, CA21 mi25 minN 010.00 miFair62°F37°F40%1023.4 hPa
Half Moon Bay Airport, CA24 mi23 minS 76.00 miFair with Haze55°F46°F72%1024.7 hPa

Link to 5 minute data for KNUQ

Wind History from NUQ (wind in knots)
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Last 24hrN4N8N14N12CalmE10NW4NE5NE8NE4NE4CalmCalmSE5CalmCalmCalmSW4Calm3CalmN5N7N9
1 day agoN9N11NW7N7N8N4N3NW3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSE34SE53CalmN6
2 days agoS7
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N9CalmCalmCalmW5CalmCalmS4CalmCalmCalmCalmCalmCalmCalmNW3N4N7

Tide / Current Tables for Calaveras Point, west of, San Francisco Bay, California
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Calaveras Point
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Thu -- 04:03 AM PST     8.86 feet High Tide
Thu -- 06:34 AM PST     Sunrise
Thu -- 09:59 AM PST     Moonset
Thu -- 11:20 AM PST     0.44 feet Low Tide
Thu -- 05:23 PM PST     7.01 feet High Tide
Thu -- 06:05 PM PST     Sunset
Thu -- 11:00 PM PST     2.37 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.356.88.28.98.57.55.942.310.50.71.83.34.96.26.96.96.14.93.72.72.4

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
Click for Map
Thu -- 01:20 AM PST     1.09 knots Max Flood
Thu -- 04:19 AM PST     -0.00 knots Slack
Thu -- 06:34 AM PST     Sunrise
Thu -- 09:00 AM PST     -1.26 knots Max Ebb
Thu -- 10:00 AM PST     Moonset
Thu -- 11:44 AM PST     0.00 knots Slack
Thu -- 02:23 PM PST     1.18 knots Max Flood
Thu -- 05:50 PM PST     -0.00 knots Slack
Thu -- 06:05 PM PST     Sunset
Thu -- 09:33 PM PST     -0.65 knots Max Ebb
Thu -- 11:34 PM PST     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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0.71.110.70.2-0.2-0.6-0.9-1.2-1.3-1-0.50.20.81.21.10.90.5-0-0.3-0.5-0.6-0.6-0.2

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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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