Tuesday, May11, 2021
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Marine Weather and Tides
Muir Beach, 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 3:33 AM PDT (10:33 UTC) Moonrise 5:10AMMoonset 7:21PM 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 Muir Beach, CA
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location: 37.78, -122.67     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 110532 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1032 PM PDT Mon May 10 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 8:55 PM PDT Monday . Another pulse of offshore winds in the hills last night and today brought more dry air into our region and also limited the strength of onshore flow near sea level. Also, a building upper ridge centered just off the West Coast warmed the airmass aloft. These developments resulted in very warm temperatures regionwide today, except for areas near the ocean. Persistent northwest winds over our coastal waters is maintaining strong upwelling and thus cold near-shore ocean waters (sea surface temps mostly in the lower 50s). Thus, areas in very close proximity to the ocean posted highs only in the 50s and 60s today, while low to mid 80s occurred not all that far away around San Francisco Bay. Most inland areas had highs ranging from the mid 80s to mid 90s. Three Bay Area locations tied daily high temperature records today including Napa (94), Richmond (88), and SFO Airport (84).

Offshore winds in the hills have been subsiding since midday and most locations are currently reporting wind gusts of 25 mph or less. Although models have been backing off on forecast wind speeds in the hills tonight, higher elevation winds are still expected to increase once again by late this evening. Even moderate offshore winds combined with little or no humidity recovery will maintain critical fire weather conditions across portions of the North and East Bay, especially when factoring in the record dry fuels for this time of year. In addition, very warm and very dry conditions will persist inland into Tuesday. See Fire Weather Discussion below for details.

Offshore winds in the hills are expected to decrease significantly by mid morning Tuesday and this should allow for a modest increase in marine air influence near the ocean and bays tomorrow, as well as in the coastal valleys, as low level onshore flow starts to ramp up. Also, it's likely we'll see an increase in low clouds and fog along the immediate coast by late in the day. However, the upper ridge is forecast to shift eastward and strengthen further over California by tomorrow. Thus, although coastal areas will likely experience modest cooling tomorrow, most inland valleys will remain very warm, as will the hills.

By Wednesday the upper ridge will flatten and its axis will shift inland, resulting in the redevelopment of widespread onshore flow. Expect cooling to develop in all but the valleys farthest inland on Wednesday. Models agree that by late in the week a trough will deepen along the West Coast, eventually forming a closed upper low over the Bay Area by late Friday night or Saturday morning. Thus, we can expect a deepening marine layer late in the week, along with temperatures cooling close to seasonal averages by Thursday and then slightly below average by Friday. The upper low will have a very limited amount of moisture at its disposal and so it's not a surprise that nearly all GFS and ECMWF ensemble members maintain dry conditions across our area through the weekend. Daytime highs next weekend are forecast to be mostly in the 60s and 70s.

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 09:00 PM PDT Monday . Current observations show winds to have diminished over most of the central and southern outer and coastal waters. Seas will take longer to diminish, which could still create isolated areas of hazardous seas for smaller vessels. Seas will continue quiet down through Tuesday morning. Winds are still elevated over the northern waters. Light winds will persist mid to late week before re- strengthening into the weekend as the next system moves through. The sea state continues to be dominated by wind driven northwest waves. A pair of light northwest and southerly swells persist throughout the forecast period.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. Red Flag Warning . CAZ507-510-511 SCA . Pt Arena to Pt Reyes 0-10 nm until 3 AM SCA . Pt Arena to Pigeon Pt 10-60 nm



PUBLIC FORECAST: Dykema 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) 2 mi64 min 52°F5 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi44 min W 3.9 G 5.8 51°F8 ft1012.6 hPa
FTPC1 - 9414290 - San Francisco, CA 11 mi52 min WSW 5.1 G 12 51°F 55°F1012 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 14 mi53 min Calm 54°F 1011 hPa
PXSC1 15 mi46 min 54°F 54°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi46 min W 2.9 G 5.1 54°F 1010.9 hPa
RCMC1 - 9414863 - Richmond, CA 17 mi52 min S 7 G 11 55°F 60°F1011.7 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi46 min W 1 G 2.9 54°F 1011.8 hPa
OBXC1 18 mi46 min 55°F 52°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi46 min WSW 2.9 G 4.1
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi46 min SSW 13 G 20 54°F 1011.9 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi46 min W 4.1 G 5.1 56°F 67°F1012.1 hPa
LNDC1 21 mi46 min N 2.9 G 4.1 56°F 1011.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 22 mi46 min 51°F1012.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi46 min W 4.1 G 6 59°F 1010.7 hPa
RTYC1 - 9414523 - Redwood City, CA 31 mi46 min NW 4.1 G 4.1 57°F 1012.4 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi44 min WNW 5.8 G 7.8 50°F 9 ft1012.9 hPa48°F
CQUC1 31 mi45 min 64°F
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi46 min WNW 8.9 G 11 59°F 65°F1011 hPa
UPBC1 34 mi46 min NW 8.9 G 12
PCOC1 - 9415144 - Port Chicago, CA 38 mi46 min WSW 9.9 G 11 58°F 67°F1010.5 hPa
BDXC1 43 mi88 min 49°F
46214 - Point Reyes, CA (029) 43 mi38 min 49°F10 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi46 min WNW 9.9 G 13 68°F 1009.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi109 min WNW 9.9 62°F 1011 hPa46°F

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA20 mi38 minWNW 810.00 miA Few Clouds54°F47°F77%1011.6 hPa
Half Moon Bay Airport, CA21 mi39 minS 72.00 miFog/Mist48°F48°F100%1012.9 hPa
Oakland, Metro Oakland International Airport, CA24 mi41 minNNW 49.00 miFair55°F49°F80%1011.6 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Tue -- 05:44 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 -- 12:35 PM PDT     4.12 feet High Tide
Tue -- 05:22 PM PDT     2.20 feet Low Tide
Tue -- 08:10 PM PDT     Sunset
Tue -- 08:20 PM PDT     Moonset
Tue -- 11:26 PM PDT     5.45 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.24.43.11.70.5-0.2-0.30.10.81.82.73.544.13.73.12.62.22.32.73.54.355.4

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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