Wednesday, December11, 2019
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Marine Weather and Tides
San Lorenzo, 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 7:12AMSunset 4:51PM Wednesday December 11, 2019 11:37 AM PST (19:37 UTC) Moonrise 4:45PMMoonset 6:35AM 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 858 Am Pst Wed Dec 11 2019
Today..E winds around 5 kt, becoming W this afternoon. A slight chance of showers this morning. Patchy fog this afternoon.
Tonight..S winds up to 10 kt. A slight chance of showers.
Thu..S winds up to 10 kt. A slight chance of rain.
Thu night..NW winds 5 to 10 kt. A slight chance of rain.
Fri..NW winds around 5 kt.
Fri night..W winds up to 10 kt.
Sat..W winds 5 to 10 kt. A chance of rain.
Sun..NW winds up to 10 kt.
PZZ500 858 Am 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... Weak high pressure off the california coast extends across california into the great basin. Winds will be light southeast through Thursday night before switching to northwest. Large northwest swells with long periods will build on Thursday and continue through Saturday.


7 Day Forecast for Marine Location Near San Lorenzo, CA
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location: 37.65, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 111757 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 957 AM 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 08:33 AM PST Wednesday . A moist zonal flow has developed in the wake of yesterday's trough. Light showers and/or drizzle continue over the Bay Area this morning. Rainfall rates are very light with only around one or two hundredths per hour. The forecast for today calls for scattered showers to decrease this afternoon across the SF Bay Area but persist across the North Bay. Tonight, a weak system moving through the flow will be accompanied by warm advection and produce additional precipitation. Steadier rain will begin across the North Bay this evening and spread south of the Golden Gate overnight. Rainfall will once again be light with this system with no major impacts. Moisture will continue to stream into northern California on Thursday and Friday with additional chances of precipitation.

Highs today will be near to slightly above normal, generally in the low 60s. Highs on Thursday and Friday will be several degrees warmer across the southern portion of the forecast area, where precipitation is less likely and clouds not as thick. Overnight lows through the end of the week will remain mild. The current forecast remains on track and no updates planned this morning. For additional details on the extended forecast, see the previous discussion.

PREV DISCUSSION. as of 02:53 AM PST Wednesday . Light rain and/or sprinkles continue over portions of the region this morning as an upper level trough exits to the east. Rainfall amounts have generally only been a few hundredths of an inch during the past 3 hours or so with the most widespread rainfall occuring over the North Bay. As a moist zonal flow is forecast to persist through late week, periods of light rain will be possible over the northern half of the region while lesser chances are expected south of the Golden Gate. Mostly cloudy conditions will also continue through late week resulting in mild overnight temperatures in the upper 40s to lower 50s with temperatures generally only warming into the lower 60s each afternoon. Overall, rainfall through late week will be minimal with no major impacts likely.

A short-wave trough is then forecast to drop into northern California late Friday into Saturday. While precipitation with this system will also be minimal given the lack of stronger mid/upper level support, rain chances will shift southward into the Central Coast along a weak frontal boundary. Conditions will then dry out late Saturday into Sunday when the zonal flow and deeper moisture advection gets shunted to the south. Temperatures will also turn cooler, only warming into the 50s for most urban areas Saturday and into Monday. Overnight conditions will also turn cooler given clearing sky conditions and colder air mass aloft, generally dropping into the 30s and 40s for most.

While forecast confidence remains low at this time, the ensembles do indicate the potential for another system to bring rain to the region during the middle part of next week. Overall, widespread heavy rainfall does not appear likely at this time, yet unsettled weather conditions will be possible during the extended forecast period.

AVIATION. as of 9:56 AM PST Wednesday . Light showers expected through the day as a series of shortwave disturbances move across northern California. MVFR cigs will be predominant through most of the day over Bay Area terminals while terminals south of the the San Francisco Bay may see some scattering out of the lower levels with mid level clouds persist. Light southeasterly winds will prevail. Light rain will taper this afternoon but may pick up again overnight as the next disturbance moves across the region.

Vicinity of KSFO . MVFR cigs around 2500-3000 ft will prevail through this evening. Cigs will lower to around 1200-1500 ft overnight. Light southeast winds under 10 kt will continue.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR/VFR cigs around 3000-6000 ft will prevail through this afternoon. Cigs will lower to around 1000-1500 ft this evening. Light east to southeasterly winds under 10 kt will continue.

MARINE. as of 9:00 AM PST Wednesday . Weak high pressure off the California coast extends across California into the Great Basin. Winds will be light southeast through Thursday night before switching to northwest. Large northwest swells with long periods will build on Thursday and continue through Saturday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. NONE.



PUBLIC FORECAST: ST/RGass AVIATION: CW MARINE: W Pi/CW

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AAMC1 - 9414750 - Alameda, CA 9 mi49 min Calm G 1 57°F 55°F1023.8 hPa
RTYC1 - 9414523 - Redwood City, CA 10 mi49 min Calm G 1 57°F 57°F1024.1 hPa
LNDC1 11 mi49 min Calm G 1 57°F 1023.7 hPa
OBXC1 12 mi49 min 55°F 55°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 12 mi49 min NNW 2.9 G 4.1
OKXC1 - 9414776 - Oakland (Berth 34), CA 13 mi49 min N 5.1 G 5.1 54°F 1023.9 hPa
PXSC1 14 mi55 min 55°F 55°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 14 mi49 min N 2.9 G 4.1 54°F 1023 hPa
FTPC1 - 9414290 - San Francisco, CA 17 mi49 min N 4.1 G 5.1 54°F 1024.1 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 19 mi49 min NW 2.9 G 4.1 55°F 1024.4 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 21 mi44 min NNW 5.1 53°F 1025 hPa (+2.0)
RCMC1 - 9414863 - Richmond, CA 21 mi49 min NNW 5.1 G 6 53°F 55°F1023.7 hPa
46237 - San Francisco Bar, CA (142) 24 mi67 min 55°F6 ft
UPBC1 27 mi49 min NE 8 G 9.9
MZXC1 - 9415102 - Martinez-Amorco CA 27 mi49 min NE 6 G 8 52°F 54°F1024.6 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 28 mi49 min ESE 7 G 9.9 52°F 1024.2 hPa
PCOC1 - 9415144 - Port Chicago, CA 30 mi49 min NE 6 G 8 52°F 53°F1024.3 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 32 mi49 min ENE 5.1 G 6 52°F 1024.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 34 mi57 min SE 9.7 G 12 56°F 56°F1024.1 hPa
SFXC1 - San Francisco Bay Reserve, CA 39 mi112 min E 4.1 52°F 1025 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi57 min SSE 19 G 23 56°F 55°F
PRYC1 - 9415020 - Point Reyes, CA 47 mi49 min 54°F1023.3 hPa

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA3 mi44 minS 310.00 miOvercast59°F50°F72%1023.8 hPa
Hayward, Hayward Air Terminal, CA5 mi43 minSE 310.00 miOvercast60°F51°F72%1024.7 hPa
San Carlos Airport, CA8 mi46 minVar 37.00 miOvercast55°F53°F94%1024 hPa
San Francisco, San Francisco International Airport, CA8 mi1.7 hrsN 010.00 miOvercast55°F51°F87%1023.6 hPa
Palo Alto Airport, CA13 mi50 minSE 510.00 miOvercast61°F53°F77%1023.7 hPa
Half Moon Bay Airport, CA18 mi42 minSSE 79.00 miOvercast57°F55°F94%1023.7 hPa
Livermore, Livermore Municipal Airport, CA21 mi44 minN 06.00 miFog/Mist56°F52°F87%1023.5 hPa

Link to 5 minute data for KOAK

Wind History from OAK (wind in knots)
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Last 24hrSW6SW3W5CalmNW5SW4NW8NW9CalmE3CalmNE3CalmE3E6E4E4SE3E6SE6SE5SE4SE4S3
1 day agoS4S3W3W5NW8NW6NW7NW4CalmCalmCalmE5E4E4CalmN3N3N3NE5CalmNE4E8S7SW6
2 days agoW4W5W6NW7NW6NW6NW7NW5CalmCalmCalmE3CalmNE3CalmSE3E3NE4E3E3CalmNE3E4SE4

Tide / Current Tables for San Mateo Bridge (east end), San Francisco Bay, California
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San Mateo Bridge (east end)
Click for Map
Wed -- 12:17 AM PST     6.36 feet High Tide
Wed -- 05:18 AM PST     2.62 feet Low Tide
Wed -- 06:35 AM PST     Moonset
Wed -- 07:13 AM PST     Sunrise
Wed -- 10:58 AM PST     8.12 feet High Tide
Wed -- 04:44 PM PST     Moonrise
Wed -- 04:50 PM PST     Sunset
Wed -- 06:18 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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6.36.25.44.23.22.72.83.75.16.57.78.17.86.7531.2-0.1-0.7-0.50.41.93.44.9

Tide / Current Tables for Little Coyote Pt 3.4 mi NNE, South San Francisco Bay, California Current
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Little Coyote Pt 3.4 mi NNE
Click for Map
Wed -- 02:19 AM PST     -0.46 knots Max Ebb
Wed -- 05:08 AM PST     0.00 knots Slack
Wed -- 06:35 AM PST     Moonset
Wed -- 07:13 AM PST     Sunrise
Wed -- 08:02 AM PST     0.52 knots Max Flood
Wed -- 10:49 AM PST     -0.00 knots Slack
Wed -- 02:31 PM PST     -0.98 knots Max Ebb
Wed -- 04:45 PM PST     Moonrise
Wed -- 04:50 PM PST     Sunset
Wed -- 06:08 PM PST     0.00 knots Slack
Wed -- 09:09 PM PST     0.73 knots Max Flood
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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-0.1-0.3-0.4-0.4-0.2-00.20.40.50.40.2-0.1-0.4-0.7-0.9-0.9-0.7-0.4-0.10.30.60.70.70.5

Weather Map
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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 (14,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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