Monday, December16, 2019
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Marine Weather and Tides
Diablo, 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 7:15AMSunset 4:51PM Monday December 16, 2019 1:40 AM PST (09:40 UTC) Moonrise 9:47PMMoonset 11:09AM Illumination 78% Phase: Waning Gibbous; Moon at 19 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- 805 Pm Pst Sun Dec 15 2019
Tonight..NW winds 5 to 15 kt, becoming north around 5 kt after midnight.
Mon..NE winds up to 10 kt.
Mon night..E winds 10 to 20 kt with gusts up to 25 kt.
Tue..E winds 10 to 20 kt with gusts up to 25 kt.
Tue night..E winds 15 to 25 kt with gusts up to 35 kt. A chance of rain.
Wed..E winds 10 to 20 kt with gusts up to 30 kt. A chance of rain.
Wed night..E winds around 5 kt. A chance of rain.
Thu..SE winds around 5 kt. A chance of rain.
Fri..SE winds 5 to 10 kt. A chance of rain.
PZZ500 805 Pm Pst Sun Dec 15 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will diminish overnight before shifting more north to northeast tomorrow morning and remain generally light to locally moderate. Winds will then increase across the waters by tomorrow night and turn southerly ahead of the next weather system. Gusty southerly winds will then persist through mid week as an upper trough moves through Tuesday night returning showers to the coastal waters. The moderate to large northwest swell that has been effecting the region will continue to subside tomorrow and Tuesday. SWells will then rebuild overnight Tuesday as the upper trough moves through.


7 Day Forecast for Marine Location Near Diablo, CA
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location: 37.87, -121.91     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 160549 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 949 PM PST Sun Dec 15 2019

SYNOPSIS. Light northerly winds will shift to slightly off shore tonight. With minimal cloud cover and cooler air, cold overnight low temperatures are forecast around the region for Monday morning, which will be the coldest of the week. As high pressure builds dry air returns with warmer temperatures. Unsettled conditions return by midweek bringing the next chance for rain; and potentially again late next weekend.

DISCUSSION. as of 9:20 PM PST Sunday . Forecast is on track as clearing skies and a cold northwest flow aloft will lead to low temperatures in the 30s over the interior and upper 30s to low 40s around the bays. Patchy frost is possible during the early morning hours. Quiet weather is expected Monday and Tuesday with just high clouds streaming over the area. The flow aloft switches to southwest which will allow for a moderation of temperatures Monday night. Highs Monday and Tuesday will be slightly warmer with temperatures in the upper 50s to low 60s.

Most models bring an upper level low through the CWA Tuesday night and Wednesday. The low opens up into a trough as it comes onshore so the highest rainfall amounts will be at the coast and the coastal mountains where up to 1/4 to 1/2 inch is possible. Inland areas will have less rain and some places in the far interior may not see any rain at all. It should also be noted that this is a compact weather system so just a slight deviation from the forecast track would result in the chances of rain being greatly reduced. Because of this the pops are only in the chance category.

After the low/trough moves inland a moist southwesterly flow will develop with warm-frontal rains into northern California and the Pacific Northwest Thursday and Friday. There is a slight chance of rain getting into the North Bay if the rains shift farther south than expected. For the rest of the CWA we could have a similar situation where low-level moisture could bring lots of clouds and local drizzle to the area similar to last week.

Models in decent agreement bringing another shot of rain Saturday night changing to showers on Sunday though rain could begin as early as Saturday afternoon in the North Bay.

Previous discussion . as of 01:44 PM PST Sunday . An upper level ridge is building over the California coastline. This is allowing high pressure to provide clearer skies across the region for what seems like since Thanksgiving. There are still a few lingering isolated showers over the Pacific, but are not forecast to come over land. Winds are light and out of the north and will slowly shift over the course of the day to offshore. The light, dry offshore winds will inhibit any fog in the overnight hours. However, the lack of clouds will promote more cooling allowing for minimum temperatures to reach their lowest for this week. Widespread low-40s to upper 30s are expected around the Bay Area and Central Coast. Isolated areas of the North Bay Valleys, the East Bay Valleys, and Southern Monterey Interior County will be in the mid-30s just above freezing. Patchy frost in these areas may be possible.

The ridge will continue to build on Monday ushering in drier air and providing a warming trend, giving further confidence that Monday's the overnight lows tonight will be the minimum for the week. Seasonal Temperatures on Monday and Tuesday before the return of unsettled weather.

The next upper level trough moves in from the west on Tuesday night, bringing with it a weather system that will bring the next opportunity for rainfall for the region. Rainfall will be light to moderate at times and last through Wednesday morning, with spotty showers lingering over the area after the brunt of the system passes. Compared to what we have seen recently, accumulations will be minimal, with most areas seeing less than a half an inch. However, higher elevations of Marin County and the Santa Cruz Mountains, as well as coastal San Mateo could see up to an inch.

The trough-ridge-trough "rinse, repeat" pattern continues as high pressure tries to build on Thursday. But models are showing the next ridge to be too weak which will allow zonal flow to set up for the end of the work week. With consistent onshore flow drawing moisture in from the ocean, it would not be surprising if the the overcast skies with occasional pop-up showers/drizzle that we saw last week are seen again Thursday and Friday. The next system will approach the coast when the next trough moves in. Models are still disagreeing on timing, though it is looking more and more like a Saturday night into Sunday event. More to come as we get closer and models can better resolve the event.

AVIATION. as of 09:31 PM PST Sunday . For 06Z TAFs. VFR conditions to prevail through the period, aside from possible reduced vis at KSTS tomorrow morning. Current satellite imagery shows high clouds passing overhead at between 15,000-20,000 ft AGL along with patchy lower clouds. This afternoon's breezy winds have subsided with all sites now reporting wind speeds less than 10 kt. Expect light winds to continue overnight before turning offshore by the morning.

Vicinity of KSFO . VFR with passing high clouds a few lower clouds still possible at around 3500 ft. Winds have diminished this evening and should remain less than 10 kt overnight. Winds expected to turn offshore by the morning.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR through the period with patchy low clouds near the Peninsula and higher clouds overhead at around 20,000 ft AGL. Winds have eased this evening and will remain light overnight and through at least the morning.

MARINE. as of 09:48 PM PST Sunday . Northwest winds will diminish overnight before shifting more north to northeast tomorrow morning and remain generally light to locally moderate. Winds will then increase across the waters by tomorrow night and turn southerly ahead of the next weather system. Gusty southerly winds will then persist through mid week as an upper trough moves through Tuesday night returning showers to the coastal waters. The moderate to large northwest swell that has been effecting the region will continue to subside tomorrow and Tuesday. Swells will then rebuild overnight Tuesday as the upper trough moves through.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Arena to Pt Reyes 0-10 nm until 10 PM SCA . Pt Reyes to Pigeon Pt 0-10 nm until 10 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 10 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 10 PM SCA . Pt Arena to Pigeon Pt 10-60 nm until 10 PM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 10 PM



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
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 12 mi53 min Calm G 1 45°F 1025.8 hPa
PCOC1 - 9415144 - Port Chicago, CA 15 mi53 min S 6 G 7 44°F 52°F1025.5 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 16 mi53 min Calm G 1.9 45°F 53°F1025.9 hPa
UPBC1 16 mi53 min NW 1 G 2.9
LNDC1 20 mi59 min WNW 1.9 G 2.9 49°F 1025.7 hPa
AAMC1 - 9414750 - Alameda, CA 22 mi53 min 55°F
OBXC1 23 mi59 min 49°F 49°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 23 mi59 min N 8 G 9.9 49°F 1025.8 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 23 mi53 min NNW 8.9 G 9.9
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 23 mi53 min SW 5.1 G 5.1 46°F 1025.7 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 24 mi53 min NNE 8.9 G 11 48°F 1026 hPa
SFXC1 - San Francisco Bay Reserve, CA 24 mi116 min NW 2.9 39°F 1026 hPa39°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 26 mi53 min NW 5.1 G 7 50°F 1024.8 hPa
PXSC1 26 mi53 min 51°F 48°F
RCMC1 - 9414863 - Richmond, CA 27 mi53 min 54°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 29 mi36 min NW 1.9 47°F 1026 hPa
FTPC1 - 9414290 - San Francisco, CA 30 mi65 min S 1.9 G 2.9 47°F 54°F1025.9 hPa
RTYC1 - 9414523 - Redwood City, CA 30 mi59 min S 1 G 1.9 46°F 57°F1026.2 hPa
46237 - San Francisco Bar, CA (142) 39 mi41 min 54°F7 ft

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Concord, Buchanan Field, CA11 mi48 minSSE 310.00 miFair42°F37°F85%1024.6 hPa
Livermore, Livermore Municipal Airport, CA13 mi48 minENE 310.00 miFair39°F35°F86%1025.6 hPa
Hayward, Hayward Air Terminal, CA18 mi47 minENE 510.00 miFair44°F39°F83%1026.6 hPa
Oakland, Metro Oakland International Airport, CA20 mi48 minN 010.00 miA Few Clouds43°F39°F89%1026.1 hPa

Link to 5 minute data for KCCR

Wind History from CCR (wind in knots)
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3CalmCalmE3S3S3W5W9W5CalmW3CalmN3CalmCalmCalmCalmSE4E4SE3CalmS3
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2 days agoS6SW3W3CalmCalmS3S6CalmSW4NW4CalmS7S11W5SW3SW6SW4CalmSW7S10S8S4W7W7

Tide / Current Tables for Mallard Island Ferry Wharf, Suisun Bay, California
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Mallard Island Ferry Wharf
Click for Map
Mon -- 12:07 AM PST     -0.46 feet Low Tide
Mon -- 06:51 AM PST     3.29 feet High Tide
Mon -- 07:17 AM PST     Sunrise
Mon -- 11:08 AM PST     Moonset
Mon -- 11:56 AM PST     1.50 feet Low Tide
Mon -- 04:49 PM PST     Sunset
Mon -- 05:10 PM PST     4.06 feet High Tide
Mon -- 09:46 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.5-0.30.31.122.73.23.33.12.621.61.51.72.33.13.743.93.42.71.80.90.2

Tide / Current Tables for Antioch Pt .3 mi E, San Joaquin River, California Current
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Antioch Pt .3 mi E
Click for Map
Mon -- 03:00 AM PST     0.01 knots Slack
Mon -- 06:13 AM PST     1.43 knots Max Flood
Mon -- 07:16 AM PST     Sunrise
Mon -- 09:39 AM PST     -0.00 knots Slack
Mon -- 11:08 AM PST     Moonset
Mon -- 11:53 AM PST     -0.68 knots Max Ebb
Mon -- 02:40 PM PST     0.00 knots Slack
Mon -- 04:48 PM PST     Sunset
Mon -- 05:29 PM PST     1.37 knots Max Flood
Mon -- 07:53 PM PST     -0.00 knots Slack
Mon -- 09:46 PM PST     Moonrise
Mon -- 11:21 PM PST     -1.92 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.7-1.3-0.7-00.81.31.41.41.10.5-0.2-0.6-0.7-0.6-0.30.20.91.31.30.7-0.1-0.8-1.5-1.9

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 (4,6,7,8)
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Ground Weather Radar Station Sacramento, CA
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