Tuesday, January28, 2020
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Marine Weather and Tides
Muir Beach, 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 5:28PM Monday January 27, 2020 11:08 PM PST (07:08 UTC) Moonrise 9:14AMMoonset 8:19PM Illumination 11% 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- 910 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 1.7 kt at 07:13 am Tuesday and 2.4 kt at 07:07 pm Tuesday.
PZZ500 910 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... A cool front will move over the coastal waters and bays Tuesday with light showers. Northerly winds will develop and increase over the coastal waters Tuesday night into Wednesday steepening wind waves combining with northwest swell creating hazardous conditions for small craft. A long period northwest swell will arrive later this week.


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 280703 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1103 PM PST Mon Jan 27 2020

SYNOPSIS. Light showers are possible over the North Bay late tonight into Tuesday, and possibly a bit farther south. Dry conditions are then forecast regionwide over the remainder of the week as high pressure builds over California. Expect a warming trend from Wednesday through Saturday. Cooling will develop by Sunday.

DISCUSSION. As of 8:50 PM PST Monday . Evening IR satellite imagery shows a system pressing inland across coastal sections of the Pacific Northwest, with a trailing cold front approaching the northern California coast. Latest models indicate that light rain will reach the North Bay by late tonight (NAM), but perhaps not until around sunrise Tuesday (HRRR). Best rain chances are in the North Bay tomorrow morning, although a few light showers may develop as far south as San Mateo County by late morning. Wet roadways are a definite possibility in the North Bay during the morning commute, and perhaps as far south as San Francisco and San Mateo County by mid morning. All other areas should experience dry conditions during the morning commute. Isolated light showers may linger into the afternoon, otherwise dry conditions will round out the day.

For the remainder of the week, look for dry conditions regionwide along with a warming trend as an upper ridge builds strongly over California. H5 heights are forecast to climb as high as 587 dm by the end of the week, while 850 mb temperatures warm to about 15 degrees C. These developments will result in high temperatures that are 5 to 10 degrees warmer than average by Friday and Saturday.

From Previous Discussion . 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 11:03 PM PST Monday . Cloud ceiling forecasts remain difficult for the overnight due to a transition from a weak warm front to mainly a weak cool front Tuesday. Outgoing night-time radiative cooling of the boundary layer will be slower tonight due to incoming mid to high level clouds from the northwest, however it's off to a solid start of low cloud development over the Salinas Valley to Monterey Bay. Tuesday's cool front spreads light showers from north to south during the day.

Vicinity of KSFO . VFR holding longer through the evening as sufficient drying continues to move in from the west. Lowering ceiling forecast Tuesday with cool front and light showers.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . IFR-MVFR cloud ceilings tonight and Tuesday morning, MVFR Tuesday. Isolated showers arriving Tuesday, mainly in the afternoon.

MARINE. as of 10:50 PM PST Monday . A cool front will move over the coastal waters and bays Tuesday with light showers. Northerly winds will develop and increase over the coastal waters Tuesday night into Wednesday steepening wind waves combining with northwest swell creating hazardous conditions for small craft. A 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: Dykema/AS AVIATION/MARINE: Canepa

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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 mi68 min 53°F9 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi38 min S 5.8 G 7.8 54°F 54°F1029.1 hPa
FTPC1 - 9414290 - San Francisco, CA 11 mi74 min 53°F 54°F1028.9 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 14 mi63 min SSW 6 52°F 1029 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi68 min 54°F 1027.9 hPa (+0.0)
PXSC1 15 mi68 min 55°F 54°F
RCMC1 - 9414863 - Richmond, CA 17 mi68 min 54°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi98 min SE 4.1 G 4.1
OBXC1 18 mi68 min 53°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi68 min 53°F 1029 hPa (+0.0)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi68 min 55°F 1029.2 hPa (+0.0)
AAMC1 - 9414750 - Alameda, CA 20 mi68 min 54°F
LNDC1 21 mi68 min 53°F 1028.9 hPa (+0.0)
PRYC1 - 9415020 - Point Reyes, CA 22 mi68 min 54°F1028 hPa (-0.7)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi68 min 53°F 1028.5 hPa (+0.0)
RTYC1 - 9414523 - Redwood City, CA 31 mi68 min 53°F 56°F1029.1 hPa (-0.4)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi38 min SW 5.8 G 7.8 54°F 55°F1029.1 hPa51°F
UPBC1 34 mi98 min W 8.9 G 9.9
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi68 min 53°F 52°F1028.6 hPa (+0.0)
PCOC1 - 9415144 - Port Chicago, CA 38 mi68 min 52°F 52°F1028.3 hPa (+0.0)
46214 - Point Reyes, CA (029) 43 mi38 min 55°F12 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi68 min 53°F 1028.1 hPa (-0.3)
SFXC1 - San Francisco Bay Reserve, CA 45 mi83 min W 6
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 47 mi38 min SSE 1.9 G 5.8 55°F1028.7 hPa

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 mi72 minS 49.00 miPartly Cloudy52°F46°F83%1028.7 hPa
Half Moon Bay Airport, CA21 mi13 minN 08.00 miA Few Clouds48°F46°F94%1029.1 hPa
Oakland, Metro Oakland International Airport, CA24 mi15 minSSW 310.00 miMostly Cloudy54°F48°F83%1028.6 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrW14CalmCalmS3SE4CalmSE3CalmCalmE3E4E4W8W9W85W11--W12W7W8W7S4Calm
1 day agoE5S6SE5W9CalmSW3W8SW11W8W10W10W10W11W14W14W11W11W12W12W15W19W16W16W16
2 days agoNW8NW6N3SE3SE4SE4CalmW5NE5SE6E4E3NE5NE6NE3CalmW7NW5W9SW8W4W4E3E3

Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Tue -- 01:44 AM PST     4.84 feet High Tide
Tue -- 06:57 AM PST     2.65 feet Low Tide
Tue -- 07:17 AM PST     Sunrise
Tue -- 09:41 AM PST     Moonrise
Tue -- 12:39 PM PST     5.09 feet High Tide
Tue -- 05:29 PM PST     Sunset
Tue -- 07:14 PM PST     0.37 feet Low Tide
Tue -- 09:16 PM PST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.14.74.84.53.93.32.82.72.83.344.655.14.73.82.71.60.80.40.51.11.92.9

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Tue -- 02:54 AM PST     -0.00 knots Slack
Tue -- 05:07 AM PST     -0.94 knots Max Ebb
Tue -- 07:17 AM PST     Sunrise
Tue -- 08:15 AM PST     0.00 knots Slack
Tue -- 09:40 AM PST     Moonrise
Tue -- 11:00 AM PST     0.86 knots Max Flood
Tue -- 02:11 PM PST     -0.00 knots Slack
Tue -- 05:15 PM PST     -1.50 knots Max Ebb
Tue -- 05:28 PM PST     Sunset
Tue -- 08:47 PM PST     0.01 knots Slack
Tue -- 09:15 PM PST     Moonset
Tue -- 11:47 PM PST     1.16 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.90.5-0.1-0.7-0.9-0.8-0.5-0.10.30.70.90.80.50.1-0.5-1.1-1.5-1.4-1-0.50.10.71.1

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 (2,6,7,8)
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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.