Saturday, December7, 2019
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Marine Weather and Tides
La Honda, 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 7:07AMSunset 4:51PM Saturday December 7, 2019 3:32 AM PST (11:32 UTC) Moonrise 2:30PMMoonset 2:32AM Illumination 80% Phase: Waxing Gibbous; Moon at 10 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 238 Am Pst Sat Dec 7 2019
.small craft advisory in effect through this evening...
Today..S winds 10 to 20 kt. Gusts up to 35 kt this afternoon. Showers. A slight chance of Thunderstorms this afternoon.
Tonight..SW winds 5 to 10 kt with gusts up to 25 kt. Showers likely and a slight chance of Thunderstorms.
Sun..W winds 5 to 10 kt. A chance of rain.
Sun night..NW winds up to 10 kt.
Mon..NW winds up to 10 kt. Patchy fog.
Mon night..NW winds up to 10 kt.
Tue..NE winds around 5 kt.
Wed..NE winds up to 10 kt. Winds and wind waves higher in and near Thunderstorms.
PZZ500 238 Am Pst Sat Dec 7 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A secondary frontal boundary will move through the coastal waters today. Scattered Thunderstorms will move into the coastal waters which could produce lightning, gusty winds, and possible waterspouts. Breezy to gusty south to southwest winds will continue through the day today before diminishing this evening. A moderate west swell will continue through Sunday. Steep wind waves will continue through the day today creating hazardous seas.


7 Day Forecast for Marine Location Near La Honda, CA
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location: 37.3, -122.29     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 071120 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 320 AM PST Sat Dec 7 2019

SYNOPSIS. Showery conditions through the morning, then another frontal band will move across the district bringing heavier showers and a chance of thunderstorms. Lingering showers on Sunday but trending drier by afternoon. Dry weather returns early next week.

DISCUSSION. as of 3:20 AM PST Saturday . Showers continue to move southward through the district although the front has weakened considerably. The complex upper low is still offshore, and another shortwave can be seen on IR satellite imagery approaching the coast. A lot of lightning is being detected with this impulse, and SPC has most of northern California under the general thunderstorm risk with a bullseye of marginal severe risk including the North Bay in the Day 1 outlook. Thus, it looks more likely for thunderstorm development this afternoon, especially across the North Bay. Therefore, another flash flood watch is warranted for the Kincade Fire burn area to account for possible brief downpours with thunderstorms in this passing shortwave. The current watch expires at 4 am.

This impulse is forecast to move through by this evening, although showers will linger into Sunday.

Winds remain gusty over the higher terrain, but are decreasing. The wind advisory will be canceled before 4 am. Winds are forecast to be gusty again as this next impulse moves through later today, but are expected to be below wind advisory criteria.

High pressure to build back in by Monday bringing drier conditions to the area. The midweek weather system still looks very weak with rain chances very slim.

AVIATION. as of 10:45 PM PST Friday . Frontal system weakening as it moves through the Bay Area but is bringing light rain and MVFR cigs. A break is expected later tonight into Saturday morning behind the front. Lightning strikes associated with a second front have been detected about 150 miles off the coast. This system will arrive in the North Bay after 15Z and the Bay Area after 18Z bringing light to moderate rain that will last through Saturday night. Latest models show a 35 percent chance of tstorms in SFO Saturday afternoon so have added VCTS to Bay Area tafs.

Winds gusting to 25 kt may decrease some overnight but should pick up again with the next system. Gusts to 30-35 kt possible in heavier rains. Things should wind down Saturday night with just some scattered showers.

Vicinity of KSFO . MVFR cigs with bases 2500-3000 feet. Light rain ending after 10Z but resuming after 18Z. Possibility of a thunderstorm in the afternoon with occasional moderate rain. Winds gusting to 25-28 kt through Saturday . locally higher in heavier rains and thunderstorms. Stronger winds above the surface could cause LLWS up to 2000 ft.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR cigs with bases around 4000 ft. Light rain through 15Z with a seconds front bringing another period of light rain by Saturday evening. Gusty south to southeast winds to 20-25 kt at MRY and 30-35 kt in the Salinas Valley. Stronger winds above the surface could cause LLWS at MRY up to 2000 ft.

MARINE. as of 2:38 AM PST Saturday . A secondary frontal boundary will move through the coastal waters today. Scattered thunderstorms will move into the coastal waters which could produce lightning, gusty winds, and possible waterspouts. Breezy to gusty south to southwest winds will continue through the day today before diminishing this evening. A moderate west swell will continue through Sunday. Steep wind waves will continue through the day today creating hazardous seas.


MTR WATCHES/WARNINGS/ADVISORIES. Tday. Flash Flood Watch . CAZ506-507 GLW . SF Bay until 3 AM GLW . Pt Arena to Pt Reyes 0-10 nm until 3 AM GLW . Pt Reyes to Pigeon Pt 0-10 nm until 3 AM GLW . Pigeon Pt to Pt Pinos 0-10 nm until 3 AM GLW . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 AM GLW . Pt Arena to Pigeon Pt 10-60 nm until 3 AM GLW . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 3 AM SCA . Mry Bay



PUBLIC FORECAST: Sims AVIATION: W Pi MARINE: ST

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 32 mi23 min S 21 G 27 57°F 56°F1014.3 hPa56°F
AAMC1 - 9414750 - Alameda, CA 33 mi45 min 54°F
LNDC1 34 mi45 min S 5.1 G 8.9 58°F 1014.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 35 mi45 min SE 9.9 G 15 59°F 1012.9 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 35 mi45 min S 8 G 13 57°F 1014.3 hPa
OBXC1 35 mi45 min 58°F 58°F
FTPC1 - 9414290 - San Francisco, CA 36 mi51 min S 7 G 12 59°F 54°F1014.6 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 36 mi33 min SSE 23 G 29 58°F 57°F1015.3 hPa56°F
46237 - San Francisco Bar, CA (142) 38 mi63 min 54°F13 ft
46114 - West Monterey Bay, CA 40 mi153 min 57°F13 ft
46092 - MBM1 40 mi86 min S 23 59°F 57°F1014.2 hPa (-0.5)
PPXC1 - 9414847 - Richmond (Point Potrero), CA 42 mi45 min S 15 G 18 58°F 1014.3 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 42 mi40 min SE 5.1 57°F 1014 hPa (+0.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 43 mi23 min SSE 21 G 27 57°F 55°F1014.1 hPa
MLSC1 - Moss Landing, South Harbor, CA 43 mi31 min SSE 11 G 31 58°F 1016.1 hPa55°F
ELXC1 - Elkhorn Slough Reserve, CA 44 mi108 min NNE 11 58°F 1015 hPa55°F
RCMC1 - 9414863 - Richmond, CA 44 mi45 min 54°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA18 mi38 minS 19 G 302.50 miFog/Mist and Breezy57°F55°F94%1015.2 hPa
San Jose, San Jose International Airport, CA20 mi40 minS 710.00 miOvercast59°F54°F83%1014.6 hPa
San Francisco, San Francisco International Airport, CA22 mi97 minE 67.00 miOvercast60°F54°F80%1013.7 hPa

Link to 5 minute data for KPAO

Wind History from PAO (wind in knots)
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Last 24hr------------------SE7SE10SE9SE12SE9----S15
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1 day ago------------------CalmCalmCalmCalm4Calm33Calm3--NW4NW5NW4Calm
2 days ago------------------E3E4CalmCalmCalm5--4--------------

Tide / Current Tables for Ano Nuevo Island, California
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Ano Nuevo Island
Click for Map
Sat -- 12:15 AM PST     1.50 feet Low Tide
Sat -- 02:33 AM PST     Moonset
Sat -- 06:40 AM PST     4.90 feet High Tide
Sat -- 07:09 AM PST     Sunrise
Sat -- 01:36 PM PST     0.92 feet Low Tide
Sat -- 02:30 PM PST     Moonrise
Sat -- 04:51 PM PST     Sunset
Sat -- 07:32 PM PST     3.41 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.62.12.83.64.34.84.94.63.932.11.4111.31.82.433.43.43.12.72.3

Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
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Dumbarton Bridge
Click for Map
Sat -- 12:23 AM PST     -0.71 knots Max Ebb
Sat -- 02:32 AM PST     Moonset
Sat -- 03:20 AM PST     0.00 knots Slack
Sat -- 06:41 AM PST     1.38 knots Max Flood
Sat -- 07:09 AM PST     Sunrise
Sat -- 10:18 AM PST     -0.00 knots Slack
Sat -- 01:00 PM PST     -1.11 knots Max Ebb
Sat -- 02:28 PM PST     Moonrise
Sat -- 04:21 PM PST     0.00 knots Slack
Sat -- 04:50 PM PST     Sunset
Sat -- 07:31 PM PST     1.30 knots Max Flood
Sat -- 11:07 PM PST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-0.7-0.5-0.20.40.91.31.41.20.80.2-0.5-1-1.1-1-0.7-0.20.411.31.31.10.70.1

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (6,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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