Monday, January27, 2020
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Marine Weather and Tides
Montara, CA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:16AMSunset 5:29PM Monday January 27, 2020 4:33 PM PST (00:33 UTC) Moonrise 9:13AMMoonset 8:18PM Illumination 9% Phase: Waxing Crescent; Moon at 3 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- 244 Pm Pst Mon Jan 27 2020
Tonight..W winds up to 10 kt. Wind waves 1 ft. W swell 9 to 11 ft at 16 seconds. A chance of showers after midnight.
Tue..SW winds up to 10 kt. Wind waves 1 ft. W swell 8 to 10 ft at 15 seconds. A slight chance of showers.
Tue night..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. W swell 9 to 11 ft at 14 seconds.
Wed..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 8 to 10 ft at 14 seconds.
Wed night..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 6 to 8 ft at 13 seconds.
Thu..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. W swell 6 to 8 ft at 13 seconds and W 3 to 5 ft at 22 seconds.
Thu night..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 9 to 11 ft at 18 seconds.
Fri..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 7 to 9 ft.
Sat..N winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 7 to 8 ft with a dominant period of 14 seconds. Across the bar...seas 8 to 10 ft with a dominant period of 14 seconds. Maximum ebb current of 2.6 kt at 06:25 pm Monday and 1.7 kt at 07:13 am Tuesday.
PZZ500 244 Pm Pst Mon Jan 27 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to moderate winds will prevail over most of the coastal waters through Tuesday. Locally stronger winds will occur south of point sur along the coast. Northerly winds will develop and increase over all the coastal waters Tuesday night into Wednesday. The increasing winds will result in steeper wind waves. Moderate northwest swell of 10 feet or more will bring hazardous conditions for small craft over most of the coastal waters. Another long period northwest swell will arrive later this week.


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 280028 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 428 PM PST Mon Jan 27 2020

SYNOPSIS. Dry conditions are likely to persist region-wide today with light rain possible over the North Bay late tonight into Tuesday. A warming trend is then expected from Wednesday through Saturday. While dry conditions will continue, a cooling trend will occur by late in the upcoming weekend.

DISCUSSION. as of 02:00 PM PST Monday . Temperatures across the region this afternoon are in the upper 50s to low 60s with not much additional warming anticipated. Overall expect temperatures to top out into the low to mid 60s for most locations. Satellite imagery shows low clouds lingering around the Bay Area with some scattered clouds south of San Jose. Synoptically, high pressure remains situated over the eastern Pacific while high clouds approach ahead of a weak upper low. This system is set to move into the Pacific Northwest tonight while an associated cold front moves through the Bay Area late tomorrow morning and into the afternoon. As a result, the North Bay may see some light precipitation late tonight and tomorrow morning with lingering showers possible into the afternoon. Precipitation chances lessen significantly south and east of San Francisco, although a stray shower or two is not out of the question. Accumulations still look fairly minimal with a few hundredths to around a tenth of an inch expected across the North Bay.

Once the system exits the region later tomorrow, an upper level ridge will build over the eastern Pacific and expand inland through late week. This will bring dry and warming conditions to the area for the rest of the week and into the weekend. Models show 850 mb temperatures increasing to around 15 deg C by Friday and Saturday. For comparison, the 00z OAK sounding had yesterday afternoon around 6 deg C at 850 mb. By Thursday, highs are forecast in the mid to upper 60s with low to mid 70s expected for Friday and Saturday. This translates to roughly 5 to 10 degrees above normal to end the week and start the weekend. Conditions will begin to cool on Sunday and further on Monday as an upper trough moves through the region, though dry weather will likely persist.

Looking out into the longer term, the CPC 6-10 day and 8-14 day outlooks show below normal precipitation for California. Additionally, the longer range GFS shows dry conditions across much of the region through early February. Ensemble QPF for both the GFS and the ECMWF show mainly dry conditions as well through at least the first week of February with only some occasional minor accumulations here and there. Overall, dry weather looks to persist across the region heading into next month.

AVIATION. as of 4:28 PM PST Monday . Ongoing difficult analysis and forecast primarily regarding ceilings due to a succession of a weak warm front to weak cool front today to a weak warm front to mainly weak cool front Tuesday within a 24 hr period per theta-e and temperature advection forecasts. Low clouds have been slow to clear today. Timing return of low clouds tonight is a very difficult forecast, outgoing night-time cooling of the boundary layer via radiative processes will be slower tonight due to incoming mid to high level clouds. Based off recent meso-model output Tuesday's cool front spreads light showers from north to south during the day.

Vicinity of KSFO . Recently went VFR at the terminal, VFR could hold longer through 02z advertised MVFR ceiling as long as drying continues to move in from the west coupled with lingering late day diurnal mixing. Will continue to coordinate with the CWSU on this through the evening.

SFO Bridge Approach . Low cloud ceiling has finally mixed out to scattered clouds, otherwise similar to KSFO.

Monterey Bay Terminals . VFR, west to northwest winds 5 to 10 knots early this evening becoming light and variable early to mid evening then light SE late evening. IFR-MVFR ceilings returning tonight and Tuesday morning, MVFR Tuesday.

MARINE. as of 3:27 PM PST Monday . Light to moderate winds will prevail over most of the coastal waters through Tuesday. Locally stronger winds will occur south of Point Sur along the coast. Northerly winds will develop and increase over all the coastal waters Tuesday night into Wednesday. The increasing winds will result in steeper wind waves. Moderate northwest swell of 10 feet or more will bring hazardous conditions for small craft over most of the coastal waters. Another long period northwest swell will arrive later this week.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pigeon Pt to Pt Pinos 0-10 nm until 3 AM SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm



PUBLIC FORECAST: AS AVIATION: Canepa MARINE: MM

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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 mi33 min 54°F9 ft
FTPC1 - 9414290 - San Francisco, CA 17 mi51 min W 4.1 G 8 56°F 54°F1028.6 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 19 mi23 min W 5.8 G 9.7 55°F 54°F1029.5 hPa
PXSC1 19 mi45 min 58°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi45 min W 9.9 G 15 56°F 1027.4 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi45 min 54°F
RTYC1 - 9414523 - Redwood City, CA 20 mi45 min E 2.9 G 4.1
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi51 min WSW 7 G 8.9
OBXC1 21 mi45 min 56°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 21 mi45 min W 6 G 8.9 56°F 1028.4 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 22 mi23 min WNW 5.8 G 7.8 55°F 55°F1029.4 hPa53°F
LNDC1 22 mi45 min WSW 7 G 9.9
TIBC1 - Tiburon Pier, San Francisco Bay, CA 23 mi28 min SW 8.9 55°F 1028 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 26 mi45 min SW 9.9 G 12 56°F 1028.4 hPa
RCMC1 - 9414863 - Richmond, CA 26 mi45 min 54°F
PRYC1 - 9415020 - Point Reyes, CA 36 mi51 min 54°F1028.4 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 38 mi45 min W 6 G 7 60°F 1027.7 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 40 mi51 min WNW 8 G 8.9 58°F 52°F1027.8 hPa
UPBC1 40 mi45 min WNW 8.9 G 11
PCOC1 - 9415144 - Port Chicago, CA 44 mi45 min W 8.9 G 11 52°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi45 min NW 8 G 12

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA6 mi38 minNW 77.00 miFair55°F51°F88%1028.8 hPa
San Francisco, San Francisco International Airport, CA12 mi37 minW 119.00 miMostly Cloudy59°F48°F69%1028.3 hPa
San Carlos Airport, CA18 mi43 minVar 310.00 miMostly Cloudy57°F53°F88%1028.8 hPa
Oakland, Metro Oakland International Airport, CA21 mi40 minW 810.00 miMostly Cloudy58°F51°F78%1028.6 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW12W12W15W19W16W16W16W14CalmCalmS3SE4CalmSE3CalmCalmE3E4E4W8W9W85W11
1 day agoNW5W9SW8W4W4E3E3E5S6SE5W9CalmSW3W8SW11W8W10W10W10W11W14W14W11W11
2 days agoW12W12W11W9W8W7W6NW8NW6N3SE3SE4SE4CalmW5NE5SE6E4E3NE5NE6NE3CalmW7

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Mon -- 12:43 AM PST     4.74 feet High Tide
Mon -- 05:54 AM PST     2.73 feet Low Tide
Mon -- 07:17 AM PST     Sunrise
Mon -- 09:12 AM PST     Moonrise
Mon -- 11:28 AM PST     5.38 feet High Tide
Mon -- 05:28 PM PST     Sunset
Mon -- 06:21 PM PST     -0.02 feet Low Tide
Mon -- 08:18 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.64.74.43.93.32.92.733.54.24.95.35.34.83.82.61.40.500.10.71.62.63.6

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Mon -- 02:18 AM PST     -0.01 knots Slack
Mon -- 04:26 AM PST     -0.91 knots Max Ebb
Mon -- 07:18 AM PST     Sunrise
Mon -- 07:28 AM PST     0.00 knots Slack
Mon -- 09:12 AM PST     Moonrise
Mon -- 10:15 AM PST     0.94 knots Max Flood
Mon -- 01:27 PM PST     -0.01 knots Slack
Mon -- 04:33 PM PST     -1.67 knots Max Ebb
Mon -- 05:27 PM PST     Sunset
Mon -- 08:10 PM PST     0.00 knots Slack
Mon -- 08:18 PM PST     Moonset
Mon -- 11:11 PM PST     1.27 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.80.2-0.5-0.9-0.9-0.6-0.20.20.70.90.90.60.2-0.4-1.1-1.6-1.6-1.3-0.8-0.10.51.11.3

Weather Map
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wmap_P
GEOS Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (19,4,5,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.