Tuesday, December10, 2019
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Marine Weather and Tides
Walnut Creek, 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 7:11AMSunset 4:50PM Tuesday December 10, 2019 5:17 AM PST (13:17 UTC) Moonrise 4:02PMMoonset 5:32AM Illumination 98% Phase: Waxing Gibbous; Moon at 13 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 208 Am Pst Tue Dec 10 2019
Today..E winds up to 10 kt. A chance of rain this afternoon.
Tonight..E winds up to 10 kt. A chance of rain.
Wed..NE winds up to 10 kt. A slight chance of rain.
Wed night..E winds up to 10 kt. A slight chance of rain.
Thu..S winds up to 10 kt. A slight chance of rain.
Thu night..SW winds up to 10 kt.
Fri..W winds up to 10 kt.
Sat..W winds 5 to 15 kt. A chance of rain.
PZZ500 208 Am Pst Tue Dec 10 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light winds will persist over the coastal waters as a weak system approaches. A weak cold front will turn winds southerly today and bring a chance of showers this evening and into Wednesday. Light to moderate southerly winds will then continue through much of the week before shifting back out of the northwest towards the weekend. Moderate northwest swell will also persist before a longer period northwest swell arrives on Thursday. Wave heights will gradually build heading into the coming weekend creating hazardous seas conditions, particularly for smaller vessels.


7 Day Forecast for Marine Location Near Walnut Creek, CA
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location: 37.9, -122.05     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 101138 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 338 AM PST Tue Dec 10 2019

SYNOPSIS. Dry conditions with mild temperatures are forecast through most of today. A weak weather system will likely produce light rain from late today into early Wednesday, mainly in the San Francisco Bay Area. Rain chances will continue in the North Bay through much of the remainder of the week, although any rain that falls is expected to be light. Generally dry weather is forecast for areas south of the Golden Gate from Wednesday through Friday. Rain chances will become more widespread on Saturday before dry weather returns Sunday and Monday.

DISCUSSION. As of 3:10 AM PST Tuesday . A band of thick high clouds has spread over our forecast area overnight, reducing outgoing longwave radiation. This is not only helping to keep overnight temperatures somewhat elevated, but also inhibiting fog formation. Surface relative humidity values are anywhere from 5 to 15 percent drier than 24 hours ago and fog is currently absent in most areas. Present conditions are much different than early yesterday morning when areas of dense fog had formed. High clouds are expected to persist for the remainder of the night and so any fog that does develop by daybreak is likely to remain patchy.

Less low level moisture this morning will mean earlier clearing of patchy low clouds today. Also, high clouds are expected to diminish by this afternoon. More sun today should mean slightly warmer temperatures than yesterday.

Early morning satellite imagery shows a system approaching from the west out near 130W. Although this system is relatively weak, it has tapped into a relatively moist airmass from the southwest with precipitable water values as high as 1.4 inches. So, although models indicate weakening as the system moves inland over California, there should be sufficient moisture to produce at least light rain across much of the SF Bay Area from late this afternoon through tonight. A few showers may linger into Wednesday morning. Rain totals through Wednesday morning are forecast to be less than a quarter inch, except locally up to a third of an inch in the coastal hills of Sonoma County. Winds are not expected to be a factor with this system, with wind gusts of only about 20 mph forecast along the coast overnight.

Once the incoming system passes tonight, the models agree that a moist zonal flow will develop across the Eastern Pacific and into the Pacific Northwest and far northern California. Weak impulses moving through this moist zonal flow may generate light rain as far south as the North Bay from time to time from late Wednesday through Friday night. A shortwave trough moving in from the northwest late in the week may then generate more widespread rainfall across our area on Saturday. However, the models have been backing off on precipitation potential on Saturday, and where rain does fall, amounts are expected to be light. Rainfall totals for the entire week, from late today through Saturday, are forecast to be a quarter of an inch of less from San Francisco southward . and from 0.25 to 1" in the North Bay. Onshore flow through the week will maintain seasonable daytime temperatures and mild nighttime temps.

Dry weather is expected to return to the entire forecast area on Sunday and Monday. Longer range models maintain a progressive pattern into next week, with at least two systems potentially impacting our area. The systems next week, while not currently expected to be overly strong or wet, at least appear likely to generate more widespread and significant rainfall than what is forecast this week.

AVIATION. as of 03:38 AM PST Tuesday . For 12z TAFs. Much of the stratus over the region last evening has cleared out as high clouds move overhead, but patches remain based on current observations. High clouds obstructing the view of the surface on satellite making it difficult to discern the extent of the remaining stratus. Obs show conditions ranging from VFR to IFR with cigs between 800 ft and 2500 ft AGL. Expect patchy low clouds to continue this morning creating occasional MVFR/IFR conditions. Patches of fog may also develop once the high clouds move out, although satellite does show another set of higher clouds just behind this current one. Depending on how things unfold, tafs may need to be amended should fog develop. Low confidence this morning on cigs/vis. Clouds expected to lift this afternoon with mid/high level clouds continuing ahead of the next system. Cigs will lower again this evening as showers move in from north to south. Generally light winds expected through the period at or less than 10 kt. Winds to turn southerly by this evening ahead of the front.

Vicinity of KSFO . Intermittent VFR/MVFR conditions due to low clouds at around 1500 to 2500 ft along with higher clouds. It is possible that the stratus will expand further once the high clouds have moved out, however, satellite does show another set of higher clouds after a brief gap. Patchy fog early this morning is also a possibility. Low confidence forecast for vis/cigs. Guidance suggests cigs will lift this afternoon with mid/high level clouds continuing ahead of the next system. High res models show light showers arriving at around 02z-04z this evening. Expect cigs to also lower once again by tonight. Light winds this morning becoming NW this afternoon and turning southerly this evening.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . High clouds obstructing view of surface conditions around the Peninsula. Obs show less extensive stratus than was seen last evening. Patchy low clouds and fog still possible this morning before lifting in the afternoon. Cigs will lower again this evening and overnight as a weak frontal system approaches. Generally light SE winds this morning to turn onshore this afternoon.

MARINE. As of 2:08 AM PST Tuesday . Generally light winds will persist over the coastal waters as a weak system approaches. A weak cold front will turn winds southerly today and bring a chance of showers this evening and into Wednesday. Light to moderate southerly winds will then continue through much of the week before shifting back out of the northwest towards the weekend. Moderate northwest swell will also persist before a longer period northwest swell arrives on Thursday. Wave heights will gradually build heading into the coming weekend creating hazardous seas conditions, particularly for smaller vessels.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: Dykema AVIATION: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
UPBC1 10 mi47 min WNW 2.9 G 5.1
MZXC1 - 9415102 - Martinez-Amorco CA 10 mi47 min W 2.9 G 5.1 50°F 54°F1024.3 hPa
PCOC1 - 9415144 - Port Chicago, CA 11 mi47 min E 2.9 G 4.1 48°F 53°F1024 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 13 mi47 min W 1.9 G 1.9 49°F 1024.3 hPa
LNDC1 14 mi47 min NNE 4.1 G 5.1 51°F 1023.5 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi47 min ENE 4.1 G 4.1 50°F 1023.9 hPa
AAMC1 - 9414750 - Alameda, CA 16 mi47 min 55°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi47 min NNE 9.9 G 12 51°F 1023.6 hPa
OBXC1 17 mi47 min 52°F 52°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 17 mi47 min NNE 8 G 11 52°F 1024 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi47 min N 8 G 9.9 51°F 1022.7 hPa
RCMC1 - 9414863 - Richmond, CA 19 mi47 min 54°F
SFXC1 - San Francisco Bay Reserve, CA 21 mi92 min Calm 45°F 1024 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 21 mi48 min N 6 51°F 1024 hPa
FTPC1 - 9414290 - San Francisco, CA 23 mi53 min NNE 7 G 8.9 52°F 54°F1024 hPa
RTYC1 - 9414523 - Redwood City, CA 28 mi47 min NNW 1 G 1.9 51°F 57°F1024 hPa
46237 - San Francisco Bar, CA (142) 32 mi47 min 54°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 43 mi27 min N 3.9 G 3.9 53°F 56°F4 ft1024.1 hPa

Wind History for Union Pacific Rail Road Bridge (UPRR), CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA6 mi24 minN 010.00 miOvercast51°F46°F83%1022.7 hPa
Oakland, Metro Oakland International Airport, CA16 mi24 minN 310.00 miOvercast51°F46°F83%1023.8 hPa
Hayward, Hayward Air Terminal, CA17 mi23 minNE 810.00 miMostly Cloudy50°F46°F86%1024.2 hPa
Livermore, Livermore Municipal Airport, CA18 mi24 minN 05.00 miFog/Mist48°F46°F96%1023.4 hPa

Link to 5 minute data for KCCR

Wind History from CCR (wind in knots)
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Last 24hrSE4CalmCalmSW3CalmCalmSW5CalmNW8NW7NW8CalmW4W6W5W4CalmW5W3CalmCalmCalmCalmCalm
1 day agoE4S6SE3CalmS7SW6NW94CalmNW4CalmNW5CalmNW4E3N3CalmS3SE3SE3SE3S3SE3Calm
2 days agoS7S4S6S10S18
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SW135S4SW9S4S8S7SE7S6S9S7CalmSE3Calm

Tide / Current Tables for Suisun Point, Carquinez Strait, California
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Suisun Point
Click for Map
Tue -- 12:45 AM PST     3.82 feet High Tide
Tue -- 05:32 AM PST     1.78 feet Low Tide
Tue -- 05:32 AM PST     Moonset
Tue -- 07:13 AM PST     Sunrise
Tue -- 11:32 AM PST     5.55 feet High Tide
Tue -- 04:02 PM PST     Moonrise
Tue -- 04:48 PM PST     Sunset
Tue -- 07:15 PM PST     -0.27 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.73.83.42.82.21.81.82.234.155.55.554.12.91.80.80.1-0.2-0.10.61.62.6

Tide / Current Tables for Roe Island S, Suisun Bay, California Current
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Roe Island S
Click for Map
Tue -- 12:07 AM PST     0.66 knots Max Flood
Tue -- 02:56 AM PST     -0.00 knots Slack
Tue -- 05:11 AM PST     -0.86 knots Max Ebb
Tue -- 05:32 AM PST     Moonset
Tue -- 07:13 AM PST     Sunrise
Tue -- 07:55 AM PST     0.00 knots Slack
Tue -- 10:40 AM PST     0.94 knots Max Flood
Tue -- 01:42 PM PST     -0.00 knots Slack
Tue -- 04:01 PM PST     Moonrise
Tue -- 04:48 PM PST     Sunset
Tue -- 05:20 PM PST     -2.39 knots Max Ebb
Tue -- 10:03 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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0.70.60.3-0-0.6-0.9-0.8-0.500.50.90.90.70.3-0.3-1.3-2.1-2.4-2.3-2.1-1.6-0.9-00.4

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 (8,2,3,4)
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Ground Weather Radar Station Sacramento, CA
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