Thursday, December12, 2019
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Marine Weather and Tides
Muir Beach, CA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:14AMSunset 4:52PM Thursday December 12, 2019 1:24 PM PST (21:24 UTC) Moonrise 5:35PMMoonset 7:41AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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- 847 Am Pst Thu Dec 12 2019
.small craft advisory in effect through late Friday night...
Today..SW winds up to 10 kt. Wind waves 1 ft. W swell 8 to 10 ft at 19 seconds, increasing to 10 to 12 ft at 19 seconds this afternoon. A chance of rain.
Tonight..S winds around 5 kt. Wind waves 1 ft. W swell 11 to 13 ft at 18 seconds. A chance of rain.
Fri..W winds 5 to 10 kt. Wind waves 1 ft. W swell 11 to 13 ft at 18 seconds. A chance of rain.
Fri night..W winds up to 10 kt. Wind waves 1 to 2 ft. W swell 10 to 12 ft at 17 seconds. A chance of rain.
Sat..NW winds 10 to 15 kt. Wind waves 1 to 2 ft. W swell 9 to 11 ft at 16 seconds. A slight chance of rain.
Sat night..NW winds 15 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 7 to 9 ft at 15 seconds.
Sun..NW winds 10 to 20 kt. Wind waves 1 to 2 ft. W swell 7 to 9 ft.
Mon..E winds 10 to 20 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft. A chance of rain.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 6 to 8 ft with a dominant period of 13 to 15 seconds increasing to 8 to 10 ft at 16 to 18 seconds Thursday. Across the bar...seas 6 to 8 ft with a dominant period of 13 to 15 seconds increasing to 9 to 11 ft at 16 to 18 seconds Thursday. Maximum ebb current of 4.1 kt at 03:43 pm Thursday and 1.2 kt at 05:01 am Friday.
PZZ500 847 Am Pst Thu Dec 12 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Southerly winds remain light and will prevail through Thursday before switching to west to northwest. By Friday night, northwest winds will increase as the next storm system moves in. A large long-period northwest swell will impact the waters through Saturday. Hazardous conditions for small craft vessels will exist with this arriving northwest swell due to steep large seas.


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 121754 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 954 AM PST Thu Dec 12 2019

SYNOPSIS. Light rain will linger over the region through the morning before diminishing in coverage later in the day. Rain chances increase again Friday into Saturday with temperatures turning colder Sunday into Monday. An unsettled and wet pattern will likely return by middle of next week.

DISCUSSION. as of 9:36 AM PST Thursday . Lots of drizzle or light rain reports this morning as zonal flow aloft continues to bring moisture into the state. Expect on and off drizzle through the day, but decreasing overnight.

By late Friday into Saturday, moisture advection will again increase over the northern and central California coast ahead of an upper level system that will drop southward over the region. This will bring renewed chances for light to moderate rain first developing over the North Bay early Friday before spreading southward Friday night. The best chances for rainfall will be over the greater San Francisco Bay Area with lesser chances for the Central Coast. Unsettled (showery) conditions could persist into Saturday before drying out late Saturday night into Sunday.

Conditions will dry out and temperatures will turn cooler Sunday into early next week as a colder air mass moves over the area from the north. Looking for more widespread 30s and 40s for overnight lows from Saturday night into Monday night. Will need to watch for the potential for areas of frost or even freezing temperatures in the region's coldest interior valleys early next week.

While the operational models continue to differ in the details heading into the latter part of next week, the ensembles do indicate a return to unsettled and wet conditions with the potential for more widespread rainfall across the region during the extended forecast period.

AVIATION. as of 9:50 AM PST Thursday . for 18z TAFs. Low to mid-level stratus clouds surround the Bay Area and the Central Coast. Mostly widespread MVFR conditions but occasional IFR, even isolated terminals at LIFR, is possible as moisture from the ocean continues to move over the area. Less than 10 kts winds will prevail across all terminals. Isolated, very light on and off rain showers persist, but will be too weak to for extended showers that could wet runways. After sunset, forecast is for cigs to lower once again as MVFR continues trending toward IFR, locally LIFR-VLIFR overnight.

Vicinity of KSFO . Light winds prevail. MVFR conditions with cigs around 1500 feet as stratus clouds sit over the region. A passing shower is possible through the TAF period, but nothing for long durations. Lowering cigs is forecast tonight trending to IFR conditions.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Winds are light with cigs around 1500 feet providing mostly MVFR conditions. Cigs should improve somewhat this afternoon but persist with MVFR. Light, passing showers are possible through the TAF period, but nothing long enough to wet runways. Tonight sees cigs lower once again to borderline LIFR/IFR overnight.

MARINE. as of 09:41 AM PST Thursday . Southerly winds remain light and will prevail through Thursday before switching to west to northwest. By Friday night, northwest winds will increase as the next storm system moves in. A large long-period northwest swell will impact the waters through Saturday. Hazardous conditions for small craft vessels will exist with this arriving northwest swell due to steep large seas.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. High Surf Advisory . CAZ006-505-509-529-530 SCA . Pt Arena to Pt Reyes 0-10 nm from 10 AM SCA . Pt Reyes to Pigeon Pt 0-10 nm from 10 AM SCA . Pigeon Pt to Pt Pinos 0-10 nm from 10 AM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 10 AM SCA . Pt Arena to Pigeon Pt 10-60 nm from 10 AM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm from 10 AM



PUBLIC FORECAST: Sims AVIATION: DK MARINE: DK

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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 mi55 min 55°F8 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 9 mi35 min ENE 1.9 G 3.9 57°F 8 ft1026.3 hPa
FTPC1 - 9414290 - San Francisco, CA 11 mi61 min SSW 5.1 G 8 59°F 55°F1026.4 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 14 mi110 min Calm 58°F 1027 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 15 mi55 min NNE 1 G 1.9 58°F 1025 hPa
PXSC1 15 mi55 min 60°F 60°F
RCMC1 - 9414863 - Richmond, CA 17 mi55 min 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 18 mi61 min NNW 1.9 G 4.1
OBXC1 18 mi55 min 58°F 58°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 18 mi55 min N 1 G 1.9 1026.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 18 mi55 min SW 8.9 G 11 59°F 1026.3 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi55 min 55°F
LNDC1 21 mi55 min NW 1.9 G 4.1 1026 hPa
PRYC1 - 9415020 - Point Reyes, CA 22 mi55 min 54°F1025.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 29 mi55 min WSW 7 G 8.9 57°F 1025.7 hPa
RTYC1 - 9414523 - Redwood City, CA 31 mi55 min NNE 4.1 G 5.1 57°F1026.1 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 31 mi35 min SSW 5.8 G 7.8 58°F 57°F9 ft1026.1 hPa58°F
UPBC1 34 mi55 min NW 5.1 G 7
MZXC1 - 9415102 - Martinez-Amorco CA 34 mi61 min Calm G 0 55°F 54°F1026.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 38 mi55 min NE 1.9 G 2.9 54°F1025.8 hPa
46214 - Point Reyes, CA (029) 43 mi55 min 57°F10 ft
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 45 mi61 min N 1 G 1.9 58°F 1025.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 45 mi100 min N 1.9 58°F 1026 hPa
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 47 mi35 min N 3.9 G 5.8 56°F10 ft1026.4 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 mi89 minN 510.00 miMostly Cloudy60°F55°F84%1025.8 hPa
Half Moon Bay Airport, CA21 mi45 minSE 40.50 miFog57°F57°F100%1026.4 hPa
Oakland, Metro Oakland International Airport, CA24 mi92 minSSE 36.00 miLight Rain Fog/Mist63°F57°F81%1026.2 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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Last 24hrN5N4N3N3N4N4SE6E3SE3S5SE10SE7SE4CalmSW3SW3CalmCalmCalmNE5CalmE5CalmN5
1 day agoNE6NE4N4NE5CalmW13W83CalmE4NE4E6E5S4CalmE3E6SE7SE4SE5SE3CalmNE4N5
2 days agoE7E5E3N4W9NW5W5NW6NW5CalmCalmE6S4CalmCalmNW4N10N8CalmN5NE6CalmCalmNE5

Tide / Current Tables for San Francisco Bar, California
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San Francisco Bar
Click for Map
Thu -- 04:07 AM PST     2.81 feet Low Tide
Thu -- 07:16 AM PST     Sunrise
Thu -- 07:40 AM PST     Moonset
Thu -- 10:11 AM PST     6.20 feet High Tide
Thu -- 04:51 PM PST     Sunset
Thu -- 05:06 PM PST     -0.96 feet Low Tide
Thu -- 05:34 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.44.13.632.833.54.35.15.86.265.23.82.10.5-0.5-1-0.7012.13.24

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Thu -- 12:44 AM PST     -0.01 knots Slack
Thu -- 02:46 AM PST     -0.90 knots Max Ebb
Thu -- 05:29 AM PST     0.00 knots Slack
Thu -- 07:16 AM PST     Sunrise
Thu -- 07:40 AM PST     Moonset
Thu -- 08:28 AM PST     1.03 knots Max Flood
Thu -- 11:33 AM PST     -0.01 knots Slack
Thu -- 02:56 PM PST     -2.02 knots Max Ebb
Thu -- 04:51 PM PST     Sunset
Thu -- 05:34 PM PST     Moonrise
Thu -- 06:32 PM PST     0.00 knots Slack
Thu -- 09:36 PM PST     1.50 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.5-0.2-0.8-0.9-0.6-0.20.20.7110.70.3-0.3-1.1-1.8-2-1.7-1.1-0.40.311.41.51.3

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 (16,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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