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Marine Weather and Tides
Livermore, 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 4:50PM Saturday December 14, 2019 10:01 PM PST (06:01 UTC) Moonrise 7:30PMMoonset 9:34AM Illumination 87% Phase: Waning Gibbous; Moon at 18 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- 804 Pm Pst Sat Dec 14 2019
.small craft advisory in effect through Sunday morning...
Tonight..NW winds 15 to 20 kt with gusts up to 30 kt. A slight chance of rain this evening.
Sun..NW winds 10 to 15 kt with gusts up to 25 kt.
Sun night..NE winds up to 10 kt.
Mon..NE winds up to 10 kt.
Mon night..E winds 5 to 10 kt.
Tue..SE winds 5 to 10 kt.
Tue night..SE winds around 5 kt. A chance of rain.
Wed..SE winds around 5 kt. A chance of rain.
Thu..SE winds around 5 kt.
PZZ500 804 Pm Pst Sat Dec 14 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Scattered showers will continue tonight across the waters as a weak cold front moves through the region. Northwest winds will increase into tomorrow as a coastal trough develops over southern california while high pressure builds offshore. Moderate to large northwest swell will gradually subside into early next week. The combination of gusty winds and large combined seas will create hazardous seas conditions through tomorrow evening, particularly for smaller vessels. Southerly winds will return later on Monday ahead of the next weather system.


7 Day Forecast for Marine Location Near Livermore, CA
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location: 37.6, -121.66     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 150541 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 941 PM PST Sat Dec 14 2019

SYNOPSIS. Scattered showers will be ending later tonight. Cooler and drier conditions are then forecast from Sunday into early next week. Unsettled weather conditions are expected to return for the middle and latter half of next week and will potentially continue into next weekend.

DISCUSSION. as of 9:30 PM PST Saturday . An upper level low is centered off the southern Oregon coast. Cool air aloft has settled into the area as the 850 mb temperature at 00Z is 10 degrees C colder than 24 hours ago. This has destabilized the airmass generating scattered showers over the area. Some of the showers have been moderate intensity and has produced up to 1/4 inch but generally rainfall amounts have been 1/10 of an inch or less.

The low will move inland over southern Oregon later tonight. The flow over the area will switch more northerly bringing drier air and ending the showers. Models indicate lingering low level moisture Sunday so we should see a lot of cumulus clouds around. The low levels dry out Sunday night and Monday for clearing skies. With the clearing skies comes colder temperatures. Lows on Sunday night will drop into the 30s over inland areas with upper 30s to mid 40s around the bays. Patchy frost is possible.

High clouds start to increase Monday night ahead of the next system. Lows Monday night are now forecast to be a couple of degrees warmer. Mid and high clouds continue to increase on Tuesday. There is still uncertainty about rain chances Tuesday night and Wednesday. The GFS has consistently advertised rain by bringing an upper low right through the CWA. But the ECMWF has been waffling between dry and wet with the latest 12Z run taking all of the precip south of the CWA. Given the GFS has had more run-to-run consistency . it is the preferred model.

There is more agreement with the medium-range models for unsettled weather for the area next weekend.

AVIATION. as of 09:41 PM PST Saturday . For 06z TAFs. A weak frontal system is moving through bringing some light showers to the region. Showers should taper off from north to south over the next few hours. Current obs show FEW to SCT cigs between 1,000-3,000 feet with another SCT to BKN layer at 4,000-5,000 ft. Cigs will generally remain VFR aside from some patchy lower clouds overnight. Cigs will then clear out tomorrow morning and throughout the day. Overall, expect VFR conditions to prevail through the period with patchy MVFR cigs possible overnight. As skies clear out, would not be surprised to see some patchy fog around KSTS early tomorrow morning. Winds have diminished this evening with W to NW winds now around 10 kt. W to NW winds should continue to subside overnight.

Vicinity of KSFO . VFR through the period with FEW to SCT clouds between 3,000 and 5,000 ft AGL. Conditions should continue to improve throughout the day tomorrow. Breezy winds seen earlier this afternoon have weakened with W to NW winds now around 10-15 kt, which should persist overnight.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Mainly VFR with borderline MVFR/VFR conditions expected as showers move through. Showers will clear out later tonight. Cigs expected to lift mid to late Sunday morning. Winds have eased this evening, expect W to NW winds around 10 kt or less overnight.

MARINE. as of 08:34 PM PST Saturday . Scattered showers will continue tonight across the waters as a weak cold front moves through the region. Northwest winds will increase into tomorrow as a coastal trough develops over southern California while high pressure builds offshore. Moderate to large northwest swell will gradually subside into early next week. The combination of gusty winds and large combined seas will create hazardous seas conditions through tomorrow evening, particularly for smaller vessels. Southerly winds will return later on Monday ahead of the next weather system.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 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 SCA . Mry Bay SCA . SF Bay



PUBLIC FORECAST: W Pi AVIATION: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 30 mi49 min WNW 4.1 G 5.1 50°F 58°F1018.6 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 33 mi49 min W 6 G 8.9 50°F 1016.6 hPa
AAMC1 - 9414750 - Alameda, CA 36 mi43 min 55°F
LNDC1 36 mi49 min NW 4.1 G 7 52°F 1017.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 37 mi43 min 53°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 38 mi49 min WNW 8.9 G 11
UPBC1 39 mi43 min WNW 19 G 23
OKXC1 - 9414776 - Oakland (Berth 34), CA 39 mi49 min NW 8.9 G 13 52°F 1017.8 hPa
OBXC1 39 mi49 min 53°F 45°F
MZXC1 - 9415102 - Martinez-Amorco CA 39 mi49 min WNW 15 G 17 51°F 54°F1016.8 hPa51°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 41 mi43 min W 2.9 G 8 52°F 1016.8 hPa
PXSC1 42 mi43 min 53°F 46°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 43 mi43 min W 5.1 G 7 52°F 1018.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 45 mi43 min W 12 G 16 51°F 1017 hPa
FTPC1 - 9414290 - San Francisco, CA 45 mi49 min WSW 1.9 G 5.1 51°F 55°F1017.9 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi43 min 55°F
SFXC1 - San Francisco Bay Reserve, CA 46 mi76 min WNW 8 48°F 1016 hPa44°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 46 mi44 min Calm 49°F 1018 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA11 mi68 minWSW 910.00 miFair48°F44°F86%1016.8 hPa
San Jose, San Jose International Airport, CA21 mi68 minWNW 810.00 miPartly Cloudy50°F45°F83%1017.9 hPa

Link to 5 minute data for KLVK

Wind History from LVK (wind in knots)
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Last 24hrSW8W7W7W6W5W8W6W6S3SW7W5W9W9W14W9W12W11W12
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1 day agoW6NW5CalmW3CalmNW3SE3CalmSE3CalmCalmCalmNW5NW8W7S3CalmN5CalmCalmNW4W8W5SW9
2 days agoCalmCalmNE4CalmCalmCalmNW4W5CalmCalmCalmCalmCalmCalmW4NW7NW8W3W5CalmW3CalmCalmCalm

Tide / Current Tables for Grant Line Canal (drawbridge), Old River, California
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Grant Line Canal (drawbridge)
Click for Map
Sun -- 04:46 AM PST     -0.39 feet Low Tide
Sun -- 07:13 AM PST     Sunrise
Sun -- 10:22 AM PST     Moonset
Sun -- 11:23 AM PST     3.00 feet High Tide
Sun -- 04:19 PM PST     1.36 feet Low Tide
Sun -- 04:47 PM PST     Sunset
Sun -- 08:35 PM PST     Moonrise
Sun -- 09:34 PM PST     3.99 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.41.50.70.1-0.3-0.4-0.10.51.42.12.732.92.62.11.61.41.41.92.63.43.943.6

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Sun -- 12:11 AM PST     1.52 knots Max Flood
Sun -- 03:51 AM PST     -0.01 knots Slack
Sun -- 07:15 AM PST     Sunrise
Sun -- 07:24 AM PST     -0.66 knots Max Ebb
Sun -- 09:12 AM PST     0.00 knots Slack
Sun -- 10:24 AM PST     Moonset
Sun -- 11:50 AM PST     0.90 knots Max Flood
Sun -- 02:27 PM PST     -0.00 knots Slack
Sun -- 04:51 PM PST     Sunset
Sun -- 07:32 PM PST     -1.47 knots Max Ebb
Sun -- 08:39 PM PST     Moonrise
Sun -- 10:11 PM PST     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.41.10.6-0.1-0.3-0.5-0.6-0.5-0.10.30.80.90.70.2-0.2-0.5-0.9-1.2-1.4-1.4-0.8-0.10.6

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 (1,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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