Wednesday, December11, 2019
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Marine Weather and Tides
Pacifica, 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 7:13AMSunset 4:53PM Wednesday December 11, 2019 7:44 PM PST (03:44 UTC) Moonrise 4:46PMMoonset 6:36AM Illumination 100% Phase: Full Moon; Moon at 15 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- 205 Pm Pst Wed Dec 11 2019
Tonight..S winds 10 to 15 kt. Wind waves 1 to 2 ft. W swell 7 to 9 ft at 17 seconds. A chance of rain.
Thu..S winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 9 to 11 ft at 18 seconds. Rain likely.
Thu night..W winds 5 to 10 kt. Wind waves 1 ft. W swell 11 to 13 ft at 17 seconds. A slight chance of rain.
Fri..SW winds around 5 kt. Wind waves 1 ft. W swell 11 to 13 ft at 18 seconds. A chance of rain.
Fri night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 10 to 12 ft at 17 seconds. A chance of rain.
Sat..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 9 to 11 ft at 16 seconds.
Sat night..NW winds 15 to 20 kt with gusts up to 30 kt. Wind waves 3 to 4 ft. W swell 7 to 9 ft at 15 seconds.
Sun..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 7 to 9 ft.
Mon..E winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 5 to 7 ft. A chance of rain.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 4 to 7 ft with a dominant period of 13 to 15 seconds. Across the bar...seas 5 to 8 ft with a dominant period of 13 to 15 seconds. Maximum ebb current of 3.9 kt at 03:07 pm Wednesday and 1.1 kt at 04:13 am Thursday.
PZZ500 205 Pm Pst Wed Dec 11 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light southerly winds will prevail tonight into Thursday then switch around to the northwest with the arrival of the next weather system. This next system will also bring with it a large long period northwest swells. This swell will build on Thursday, peak on Friday and continue through Saturday.


7 Day Forecast for Marine Location Near Pacifica, CA
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location: 37.62, -122.51     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 120009 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 409 PM PST Wed Dec 11 2019

SYNOPSIS. Periods of light rain will be possible over mainly the northern portion of the forecast area through Saturday with mild temperatures region-wide. Conditions will dry out and turn cooler Sunday into Monday. Unsettled conditions will potentially return by mid/late next week.

DISCUSSION. as of 02:04 PM PST Wednesday . KMUX radar continues to indicate scattered showers mainly across the North Bay with isolated showers around San Mateo and Santa Cruz Counties. Additional showers have formed off the coast and will drift inland this afternoon. Moist zonal flow has developed and will remain in place through Friday with subtropical moisture offshore. A weak disturbance moving through the flow will interact with the abundant moisture to enhance rainfall this evening and overnight, mainly across the northern half of the forecast area. Scattered showers will continue on Thursday, with another disturbance on Friday bringing another round of light rain, once again focused on our northern areas. The moist onshore flow will finally be pushed south on Saturday as a trough approaches from the northwest. Precipitation from the trough looks to be very light and mostly brush by to our north. The trough will usher in a colder and drier airmass with Sunday and Monday cool and dry.

Precipitation amounts tonight through Thursday will range from a quarter to a half inch across the North Bay, 0.1 to 0.2 inches in the Bay Area, and less than a tenth of an inch near Monterey Bay. The higher terrain of the North Bay could pick up slightly higher amounts with totals up to an inch. Additional rainfall on Friday will range from a few hundredths to a quarter of an inch, with locally up to a half inch in the North Bay Mountains. Rainfall rates and totals are not expected to create significant impacts, with wet and slick roadways the main concern during brief periods of moderate rain.

Skies will remain cloudy through the week as moisture continues to stream inland. Temperatures will warm several degrees across southern areas on Thursday and Friday under a slightly warmer airmass. Highs both days will mainly be in the 60s, coolest across the North Bay where showers will be the most persistent and warmest in the lower elevations of Monterey and San Benito Counties. Temperatures will cool significantly on Saturday behind a cold front with highs in the mid to upper 50s. Cool temperatures will continue on Sunday and Monday as northwesterly flow aloft sets up. Overnight lows will also drop considerably with 30s possible in many valley locations.

A ridge will build over the eastern Pacific on Sunday and move overhead on Monday. The ridge looks to be short-lived as another trough is projected to approach California on Tuesday or Wednesday. Models have generally come into better agreement about this feature with the latest model cycle. Looking into the long term, the pattern looks to remain progressive into the middle of December with the potential for more significant storm systems 8-14 days into the future.

AVIATION. as of 4:10 PM PST Wednesday . A series of shortwave disturbances will keep abundant low level moisture over the area through Thursday. MVFR cigs will persist with occasional IFR cigs in the valleys and the MRY Bay Area. Some light rain is occurring mainly in the North Bay this afternoon but this will spread over the SFO Bay Area and possibly further south tonight after midnight as the next disturbance approaches. Winds will be light and generally out of the east or southeast.

Vicinity of KSFO . MVFR cigs with bases around 1500-2000 ft. Light southeast winds under 10 kt. Occasional light rain after 09-10Z.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Areas of MVFR cigs around the area becoming more widespread after 03Z. Cigs lowering into IFR category after 06-08Z. Light east to southeasterly winds under 10 kt.

MARINE. as of 04:00 PM PST Wednesday . Light southerly winds will prevail tonight into Thursday then switch around to the northwest with the arrival of the next weather system. This next system will also bring with it a large long period northwest swells. This swell will build on Thursday, peak on Friday and continue through Saturday.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. NONE.



PUBLIC FORECAST: ST AVIATION: W Pi MARINE: CW

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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) 13 mi75 min 55°F8 ft
FTPC1 - 9414290 - San Francisco, CA 13 mi63 min Calm G 4.1 56°F 55°F1021.4 hPa
PXSC1 14 mi57 min 57°F 57°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi57 min SE 8.9 G 9.9 56°F 1020.3 hPa
AAMC1 - 9414750 - Alameda, CA 15 mi57 min 55°F
OBXC1 16 mi57 min 56°F 56°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi57 min SSW 2.9 G 4.1 56°F 1021.4 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi57 min SSE 4.1 G 4.1
LNDC1 17 mi57 min SSW 1.9 G 2.9 57°F 1021.3 hPa
RTYC1 - 9414523 - Redwood City, CA 18 mi57 min SSE 4.1 G 5.1 61°F 58°F1022.2 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 19 mi64 min SE 1.9 56°F 1022 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 20 mi35 min SSE 16 G 19 57°F 56°F1022 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 21 mi57 min SE 4.1 G 5.1 56°F 1021.5 hPa
RCMC1 - 9414863 - Richmond, CA 22 mi57 min 55°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 27 mi35 min SSE 16 G 18 58°F 57°F1022 hPa57°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 33 mi57 min E 12 G 14 53°F 1021.1 hPa
UPBC1 35 mi57 min ENE 8 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 35 mi57 min NE 7 G 8 53°F 54°F1021.7 hPa
PRYC1 - 9415020 - Point Reyes, CA 36 mi57 min 54°F1020.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 39 mi57 min ENE 5.1 G 7 53°F 54°F1021.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 44 mi57 min SE 11 G 13 54°F 1021.8 hPa
SFXC1 - San Francisco Bay Reserve, CA 48 mi60 min N 1.9 52°F 1022 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, CA8 mi1.8 hrsNNE 410.00 miOvercast58°F54°F87%1021.5 hPa
Half Moon Bay Airport, CA8 mi50 minSSE 105.00 miFog/Mist57°F55°F94%1022 hPa
San Carlos Airport, CA15 mi58 minSE 1010.00 miMostly Cloudy59°F55°F88%1022 hPa
Oakland, Metro Oakland International Airport, CA16 mi52 minS 610.00 miOvercast60°F54°F80%1021.5 hPa
Hayward, Hayward Air Terminal, CA21 mi51 minS 610.00 miOvercast61°F54°F78%1022.5 hPa
Palo Alto Airport, CA23 mi58 minSE 610.00 miMostly Cloudy61°F53°F77%1022 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hrSE5SE9SE4SE3E5CalmSE7S6S6SE3SE4S5SE5S4SE7SE6S7SE7SE5S9S9SE10S10S10
1 day agoN3NE5NE4CalmCalmN3N3CalmE5CalmN5CalmCalmCalmCalmW6CalmSE6S6SW4S7S4W7Calm
2 days agoN8N6CalmCalmCalmCalmCalmCalmE4E3E4NE8NE4CalmNW4NW7N7NW7NW9NW10N7N6N6N6

Tide / Current Tables for Seaplane Harbor, San Francisco Bay, California
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Seaplane Harbor
Click for Map
Wed -- 12:11 AM PST     5.96 feet High Tide
Wed -- 05:02 AM PST     2.62 feet Low Tide
Wed -- 06:36 AM PST     Moonset
Wed -- 07:14 AM PST     Sunrise
Wed -- 10:52 AM PST     7.72 feet High Tide
Wed -- 04:45 PM PST     Moonrise
Wed -- 04:51 PM PST     Sunset
Wed -- 06:02 PM PST     -0.72 feet Low Tide
Wed -- 09:14 PM PST     Full Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.95.74.93.932.62.93.95.16.47.47.77.36.14.42.50.8-0.3-0.7-0.40.623.54.8

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
Click for Map
Wed -- 12:14 AM PST     -0.01 knots Slack
Wed -- 02:40 AM PST     -0.68 knots Max Ebb
Wed -- 05:18 AM PST     0.00 knots Slack
Wed -- 06:36 AM PST     Moonset
Wed -- 07:14 AM PST     Sunrise
Wed -- 08:22 AM PST     0.79 knots Max Flood
Wed -- 11:14 AM PST     -0.00 knots Slack
Wed -- 02:52 PM PST     -1.46 knots Max Ebb
Wed -- 04:45 PM PST     Moonrise
Wed -- 04:50 PM PST     Sunset
Wed -- 06:18 PM PST     0.00 knots Slack
Wed -- 09:14 PM PST     Full Moon
Wed -- 09:29 PM PST     1.09 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.1-0.3-0.6-0.7-0.4-0.10.20.60.80.70.50.1-0.4-0.9-1.3-1.5-1.2-0.8-0.20.40.81.11.10.9

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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Wind Forecast for San Francisco/Monterey Bay Area, CA (22,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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