Tuesday, May11, 2021
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Marine Weather and Tides
Montara, 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 6:01AMSunset 8:10PM Tuesday May 11, 2021 4:22 AM PDT (11:22 UTC) Moonrise 5:10AMMoonset 7:20PM Illumination 0% Phase: New Moon; Moon at 29 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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PZZ545 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 248 Am Pdt Tue May 11 2021
Today..S winds up to 10 kt. Wind waves 5 to 6 ft. W swell 2 to 3 ft at 15 seconds.
Tonight..S winds up to 10 kt. Wind waves 3 to 4 ft. W swell 2 to 3 ft at 13 seconds and sw around 2 ft at 17 seconds. Patchy dense fog.
Wed..S winds 5 to 10 kt. Wind waves 3 to 4 ft. NW swell 2 to 3 ft at 12 seconds and sw around 2 ft at 16 seconds.
Wed night..SW winds up to 10 kt. Wind waves 3 to 4 ft. NW swell 2 to 3 ft at 11 seconds and sw around 2 ft at 16 seconds.
Thu..SW winds 5 to 10 kt. Wind waves 2 to 3 ft. W swell around 2 ft at 11 seconds and sw around 2 ft at 15 seconds.
Thu night..W winds 5 to 10 kt. Wind waves 4 to 5 ft. W swell around 2 ft at 10 seconds and sw 2 to 3 ft at 15 seconds.
Fri..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 8 to 9 ft. SWell sw around 2 ft.
Sat..W winds 10 to 20 kt. Wind waves 8 to 9 ft. SWell sw around 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 4 to 6 ft, with a dominant period of 9 seconds. Across the bar...combined seas 5 to 7 ft, with a dominant period of 9 seconds. Maximum ebb current of 3.5 kt at 05:01 am Tuesday and 1.2 kt at 05:37 pm Tuesday.
PZZ500 248 Am Pdt Tue May 11 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds along the coast and southern waters continue to diminish while staying breezy to moderately gusty over the northern outer waters. Seas continue to subside, but will remain hazardous for smaller vessels through Tuesday afternoon. By mid-week, winds will be light with prevailing mixed seas from light northwest and southerly swells. Winds will increase over the weekend increasing the wind driven waves when the next system approaches the waters.


7 Day Forecast for Marine Location Near Montara, CA
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location: 37.57, -122.58     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 111036 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 336 AM PDT Tue May 11 2021

SYNOPSIS. A Red Flag Warning remains in effect through 6 pm Tuesday for the North and East Bay Hills as well as the East Bay Interior Valleys. Otherwise, expect continued sunny and warm weather through Tuesday. A cooling trend begins Wednesday and lasts through the end of the week and into next weekend as the marine layer develops and also deepens, and as onshore winds prevail.

DISCUSSION. As of 3:32 AM PDT Tuesday . Satellite fog product shows the lingering coastal clouds from Monday evening have become more established and returned as a shallow marine layer. Satellite fog product shows low clouds along the entire coast from Big Sur to the Golden Gate. Fort Ord profiler near Marina, CA, shows a shallow layer less than 1k feet. Salinas Airport is also showing low ceilings with patchy fog as the marine layer pushes up the valley. Do expect coverage to increase along the coast through sunrise. With the exception of the Salinas Valley not expecting much of an inland push of the marine layer this morning. One of the main reasons for this is the lingering offshore flow. Gradients still indicate offshore flow pressure gradients. The offshore flow is reflected across the higher terrain as weather stations continue to show breezy conditions and low relative humidity. Winds may have eased since their peak readings earlier, but breezy winds and low RH are contributing to critical fire weather conditions. Critical fire weather conditions are expected to continue through this afternoon so no change in existing Red Flag Warning. See Fire Weather section below for more details.

Otherwise, another mild to warm day is expected across the Bay Area on Tuesday. Warmest conditions are expected across the interior and the higher terrain.

Offshore flow will end by Wednesday and onshore flow will return ushering in more widespread cooling and higher humidity. The cooler weather will persist into the upcoming weekend with night and morning clouds becoming more widespread. One weather item of note that will be watched over the next few days will be the possible development of an upper level low Friday night and Saturday. Medium range models and ensembles show the development of an upper level over the region Friday night/Saturday. The detail that is less certain is precip. A few models do develop some showers with the low, but confidence is too low to include them in the forecast just yet.

AVIATION. As of 10:31 PM PDT Monday . For the 06z TAFs. VFR conditions around the Bay Area and the Central Coast. There is small "slug" of stratus crawling up the Monterey Bay into Santa Cruz that will be monitored, but otherwise, light winds and clear skies is expected overnight. LLWS was removed from most of the TAF sites, expect KAPC and KLVK, as the obs just are verifying it and most models have really pared it down to the far eastern portions of the forecast area. VFR expected on Tuesday with onshore breezy winds, stronger through coastal gaps up to 20 kts. Winds subside Tuesday right as skies remain mostly clear, with stratus returning to the Monterey Bay.

Vicinity of KSFO . Winds remain breezy from 10 to 15 kts, but beginning to diminish. VFR forecast through the TAF period. Winds will increase during the day, but as the large scale pattern breaks down, winds will be tamer than recent, up to 20 kts, staying breezy through the end of the TAF period.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Obs suggesting that KSNS is IFR, yet satellite has most of the stratus drifting north toward Santa Cruz. Likely that the onshore flow is pushing sea spray/salt over the ceilometer suggesting there is a cloud deck. The stratus will be monitored as most hi-res models suggest it will come back into peninsula terminals after 12Z for a more robust return to IFR. But it should clear between 16 and 17Z. VFR Tuesday with breezy onshore winds. Stratus returns to terminals after 01Z Tuesday night, with a farther push toward the Salinas Valley at the end of the TAF period.

FIRE WEATHER. As of 4:00 PM PDT Monday . Red Flag Warning remains in effect through 6 pm Tuesday for zones 507/510/511. Winds in the hills subsided somewhat on Monday afternoon, but were still gusting between 25 and 35 mph while RH values have dropped as low as the teens. Offshore winds in the hills are forecast to increase once again tonight, although models have backed off on wind speeds tonight. In any case, a reinforcing burst of dry air arriving late this afternoon and evening will result in little or no RH recovery overnight. Very dry air, combined with moderate offshore winds in the hills, will maintain critical fire weather conditions into Tuesday morning. Winds will subside by mid morning Tuesday, but warm and very dry conditions will persist through the afternoon hours with RH values dropping as low as the single digits.

Onshore breezes should return to all areas by Tuesday evening. Moderating conditions are forecast into Weds in terms of cooler temps and an uptick in humidity. A cooling trend will continue through the end of the week with temps and humidity returning to more seasonal values.

MARINE. as of 03:05 AM PDT Tuesday . Winds along the coast and southern waters continue to diminish while staying breezy to moderately gusty over the northern outer waters. Seas continue to subside, but will remain hazardous for smaller vessels through Tuesday afternoon. By mid-week, winds will be light with prevailing mixed seas from light northwest and southerly swells. Winds will increase over the weekend increasing the wind driven waves when the next system approaches the waters.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. Red Flag Warning . CAZ507-510-511 SCA . Pt Arena to Pigeon Pt 10-60 nm until 3 PM SCA . SF Bay from 3 PM



PUBLIC FORECAST: MM AVIATION: DK MARINE: Dhuyvetter FIRE WEATHER: Dykema

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 15 mi53 min 53°F5 ft
FTPC1 - 9414290 - San Francisco, CA 17 mi53 min WSW 7 G 11 51°F 55°F1011.8 hPa
PXSC1 19 mi53 min 54°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi53 min WSW 1.9 G 6 54°F 1010.7 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 19 mi43 min W 3.9 G 5.8 51°F1012.7 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi53 min WNW 2.9 G 5.1 56°F 67°F1012 hPa
RTYC1 - 9414523 - Redwood City, CA 20 mi53 min NNW 5.1 G 5.1 56°F 1012.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi53 min W 4.1 G 5.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 21 mi53 min WNW 4.1 G 5.1 54°F 1011.7 hPa
OBXC1 21 mi53 min 55°F 52°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 22 mi43 min WNW 5.8 G 7.8 50°F 1013 hPa48°F
LNDC1 22 mi53 min N 2.9 G 4.1 56°F 1011.6 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 23 mi102 min Calm 54°F 1011 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 26 mi53 min SSW 13 G 18 53°F 1011.9 hPa
RCMC1 - 9414863 - Richmond, CA 26 mi53 min S 7 G 12 55°F 61°F1011.5 hPa
PRYC1 - 9415020 - Point Reyes, CA 36 mi53 min 51°F1012.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 38 mi53 min NE 4.1 G 4.1 59°F 1010.8 hPa
CQUC1 39 mi94 min 64°F
MZXC1 - 9415102 - Martinez-Amorco CA 40 mi53 min WNW 9.9 G 13 58°F 65°F1010.9 hPa
UPBC1 40 mi53 min WNW 8.9 G 12
PCOC1 - 9415144 - Port Chicago, CA 44 mi53 min SW 9.9 G 11 58°F 66°F1010.4 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi53 min NW 8.9 G 12 69°F 1009.5 hPa

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA6 mi28 minSSE 80.25 miFog48°F46°F94%1012.9 hPa
San Francisco, San Francisco International Airport, CA12 mi27 minWNW 910.00 miA Few Clouds53°F47°F80%1011.5 hPa
San Carlos Airport, CA18 mi28 minN 09.00 miFair55°F46°F72%1012.2 hPa
Oakland, Metro Oakland International Airport, CA21 mi30 minNW 59.00 miFair54°F49°F83%1011.6 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hrE3CalmCalmNW3NW8NW7NW9NW10NW12NW8NW9NW11NW12NW8NW7NW4CalmCalmCalmSE5SE7S7S9SE9
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Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
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Tue -- 05:25 AM PDT     -0.31 feet Low Tide
Tue -- 06:03 AM PDT     Sunrise
Tue -- 06:09 AM PDT     Moonrise
Tue -- 12:01 PM PDT     New Moon
Tue -- 12:04 PM PDT     4.02 feet High Tide
Tue -- 05:03 PM PDT     2.20 feet Low Tide
Tue -- 08:09 PM PDT     Sunset
Tue -- 08:19 PM PDT     Moonset
Tue -- 10:55 PM PDT     5.35 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.83.82.51.20.2-0.3-0.20.31.12.133.743.93.42.92.42.22.433.74.55.15.3

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Tue -- 12:21 AM PDT     -0.00 knots Slack
Tue -- 03:23 AM PDT     -1.77 knots Max Ebb
Tue -- 06:03 AM PDT     Sunrise
Tue -- 06:09 AM PDT     Moonrise
Tue -- 06:56 AM PDT     0.00 knots Slack
Tue -- 09:59 AM PDT     1.42 knots Max Flood
Tue -- 12:01 PM PDT     New Moon
Tue -- 01:36 PM PDT     -0.01 knots Slack
Tue -- 03:50 PM PDT     -1.01 knots Max Ebb
Tue -- 06:50 PM PDT     0.00 knots Slack
Tue -- 08:10 PM PDT     Sunset
Tue -- 08:20 PM PDT     Moonset
Tue -- 09:37 PM PDT     1.04 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0.5-1.3-1.7-1.7-1.3-0.700.81.31.41.310.4-0.3-0.9-1-0.8-0.40.10.6110.8

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