Saturday, December7, 2019
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Marine Weather and Tides
Piedmont, 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 7:09AMSunset 4:50PM Saturday December 7, 2019 3:44 PM PST (23:44 UTC) Moonrise 2:29PMMoonset 2:32AM Illumination 84% Phase: Waxing Gibbous; Moon at 11 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- 928 Am Pst Sat Dec 7 2019
.small craft advisory in effect until 9 pm pst this evening...
Today..S winds 15 to 25 kt with gusts up to 35 kt. Showers and a slight chance of Thunderstorms.
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt. Showers and a slight chance of Thunderstorms.
Sun..SW winds up to 10 kt. Rain likely.
Sun night..N winds around 5 kt.
Mon..W winds up to 10 kt. Patchy fog.
Mon night..W winds up to 10 kt.
Tue..NE winds up to 10 kt.
Wed..NE winds up to 10 kt. Winds and wind waves higher in and near Thunderstorms.
PZZ500 928 Am Pst Sat Dec 7 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A secondary frontal boundary will move through the coastal waters today. Scattered Thunderstorms will move into the coastal waters which could produce lightning, gusty winds, and possible waterspouts. Breezy to gusty south to southwest winds will continue through the day today before diminishing this evening. A moderate west swell will continue through Sunday. Steep wind waves will continue through the day today creating hazardous seas.


7 Day Forecast for Marine Location Near Piedmont, CA
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location: 37.85, -122.22     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 072109 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 109 PM PST Sat Dec 7 2019

SYNOPSIS. Showery conditions through the morning, then another frontal band will move across the district bringing heavier showers and a chance of thunderstorms. Lingering showers on Sunday but trending drier by afternoon. Dry weather returns early next week.

DISCUSSION. as of 1:09 PM PST . The next round of rain has arrived to the North Bay. Latest KMUX radar imagery shows light to moderate rain falling across much of Sonoma and Napa Counties as of 1 pm PST. The rain is also starting to impact San Francisco this early afternoon. Expect the rain to continue spreading southeastward through the rest of the day. While we have yet to observe any lightning strikes in the San Francisco Bay Area, the chance of thunderstorms will continue through the evening hours for much of the region. The Day 1 Storm Prediction Center has the vast majority of the region in at least the general thunder category. Additionally, most of the North Bay is under a marginal risk for severe weather. The 18Z HRRR does indicate some locally impressive 0-1 km bulk shear and 0-1 km storm relative helicity values, but think the best potential for any sort of rotating storms will be to the east of the area in the Central Valley where the skies have thus far remained generally clear today. In addition to the thunderstorm risk, a Flash Flood Watch is in effect for the Kincade Fire burn area through 10 pm PST this evening.

Southerly winds will remain locally strong through the rest of the afternoon. Winds have already gusted above 40 mph at SFO, 31 mph at OAK, and at least 25 mph at MRY today. These winds will diminish later this afternoon or evening near sea level with breezy conditions likely persisting in the higher elevations into the overnight hours.

Scattered rain showers are expected to continue through about mid-day on Sunday as the upper level trough axis passes through the Bay Area. Behind this trough an upper level ridge will quickly build over the West Coast, bringing dry conditions to the Bay Area and Central California Coast for Monday and Tuesday. Models advertise a weak system that will impact parts of northern California around Wednesday. At this point it would appear the best chances for rain would be north of the Golden Gate with perhaps a few tenths of an inch. Another system will then arrive late Thursday or Friday to northern California, but again the best rain chances will be to the north of the Golden Gate. Overall -- all locations are expected to be significantly drier this upcoming week compared to the last few weeks. In fact, the latest 6-10 day precipitation outlook (valid December 13-17) from the Climate Prediction Center places much of central and southern California with favored odds of experiencing below normal precipitation.

AVIATION. as of 9:55 AM PST Saturday . Scattered showers will continue to increase in coverage and intensity through the morning hours. Skies are mainly MVFR this morning and this is expected to continue through the day. The upper low offshore will push more energy through the area this afternoon. Moderate to potentially heavy rain showers and a chance for thunderstorms will arrive this afternoon as another front pushes through. Winds this morning will gust to 25-30 kt with gusts increasing briefly this afternoon to 30-35 kt along the front. In and around thunderstorms winds may become directionally erratic. Occasional lulls have been observed at the terminals overnight and this will continue through the morning. LLWS will be a concern at the terminals through the afternoon. Winds will subside this evening after the front passes through. Scattered showers will persist this evening and overnight but rainfall should be light. MVFR cigs will persist through the end of the TAF period.

Vicinity of KSFO . MVFR cigs with bases generally 2000-2500 feet. Light scattered showers will persist early this morning. Scattered thunderstorms are possible this afternoon with moderate to briefly heavy rain. Southeast winds have gusted to near 30 kt this morning mixed with periods of lighter winds. Lulls in stronger winds will continue through the morning hours. Gusty winds 30-35 kt will be possible this afternoon with locally higher gusts in thunderstorms. LLWS will be a concern today especially during periods of lighter winds at the terminal.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Borderline MVFR/VFR this morning with bases 3000 feet. Light rain showers continuing through the day. Gusty south to southeast winds to 20-25 kt at MRY and 30-35 kt in the Salinas Valley. Stronger winds above the surface could cause LLWS at MRY up to 2000 ft. Isolated thunderstorms are now possible into the Monterey Bay terminals this afternoon so VCTS continues in the TAFs.

MARINE. as of 12:59 PM PST Saturday . A secondary frontal boundary will move through the coastal waters today. Scattered thunderstorms will move into the coastal waters which could produce lightning, gusty winds, and possible waterspouts. Breezy to gusty south to southwest winds will continue through the day today before diminishing this evening. A moderate west swell will continue through Sunday. Steep wind waves will continue through the day today creating hazardous seas.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. Flash Flood Watch . CAZ506-507 SCA . SF Bay until 9 PM SCA . Mry Bay until 9 PM SCA . Pt Arena to Pt Reyes 0-10 nm until 9 PM SCA . Pt Reyes to Pigeon Pt 0-10 nm until 9 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 9 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 9 PM SCA . Pt Arena to Pigeon Pt 10-60 nm until 9 PM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 9 PM



PUBLIC FORECAST: Rowe AVIATION: BFG MARINE: BFG

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LNDC1 5 mi63 min S 15 G 19 59°F 1012.4 hPa
AAMC1 - 9414750 - Alameda, CA 7 mi57 min 54°F
OBXC1 7 mi63 min 58°F 54°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 7 mi63 min SW 16 G 24 57°F 1012 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi57 min S 28 G 33 62°F 1011.5 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 10 mi57 min S 5.1 G 12 60°F 1011 hPa
RCMC1 - 9414863 - Richmond, CA 11 mi57 min 55°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 12 mi100 min SE 14 60°F 1011 hPa
FTPC1 - 9414290 - San Francisco, CA 13 mi63 min S 14 G 23 59°F 55°F1012.2 hPa
UPBC1 14 mi57 min SW 19 G 30
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 14 mi57 min SSW 18 G 25 61°F 1010.3 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 14 mi63 min SSW 17 G 21 62°F 54°F1011.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 17 mi57 min 53°F
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 22 mi63 min SW 7 G 15 62°F 1011.7 hPa
46237 - San Francisco Bar, CA (142) 22 mi75 min 54°F10 ft
RTYC1 - 9414523 - Redwood City, CA 24 mi63 min S 8.9 G 18 62°F 57°F1013.3 hPa
SFXC1 - San Francisco Bay Reserve, CA 26 mi120 min SW 13 60°F 1012 hPa55°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 33 mi45 min SSW 19 G 25 58°F 56°F1012.6 hPa (-0.7)
PRYC1 - 9415020 - Point Reyes, CA 41 mi63 min 55°F1010.2 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 49 mi45 min S 21 G 25 59°F 56°F1012.7 hPa57°F

Wind History for Oakland Middle Harbor, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oakland, Metro Oakland International Airport, CA10 mi52 minS 112.00 miHeavy Rain60°F55°F84%1012.6 hPa
Concord, Buchanan Field, CA13 mi52 minS 15 G 218.00 miLight Rain61°F55°F81%1010.2 hPa
Hayward, Hayward Air Terminal, CA14 mi51 minS 103.00 miRain61°F55°F84%1013.5 hPa
San Francisco, San Francisco International Airport, CA18 mi1.8 hrsS 20 G 335.00 miRain and Breezy62°F55°F78%1011.9 hPa
San Carlos Airport, CA22 mi55 minS 9 G 212.00 miLight Rain Fog/Mist61°F57°F88%1012.9 hPa
Livermore, Livermore Municipal Airport, CA24 mi52 minSSW 1010.00 miOvercast58°F54°F87%1012.2 hPa

Link to 5 minute data for KOAK

Wind History from OAK (wind in knots)
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1 day agoNW3N4N3NW4NW4CalmNE4CalmSE5E6E3E3E5E7E7SE7SE9SE10SE14SE11S13SE15
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2 days agoE4E7NE8NE3CalmE4E4CalmCalmS3SE4CalmCalmCalmCalmCalmCalmCalmCalmCalmW4W4CalmW5

Tide / Current Tables for Berkeley, San Francisco Bay, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Oakland Harbor WebStreeter Street, San Francisco Bay, California Current
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Oakland Harbor WebStreeter Street
Click for Map
Sat -- 02:09 AM PST     0.00 knots Slack
Sat -- 02:33 AM PST     Moonset
Sat -- 05:23 AM PST     0.81 knots Max Flood
Sat -- 07:11 AM PST     Sunrise
Sat -- 08:20 AM PST     -0.00 knots Slack
Sat -- 11:09 AM PST     -1.01 knots Max Ebb
Sat -- 02:29 PM PST     Moonrise
Sat -- 03:07 PM PST     0.00 knots Slack
Sat -- 04:49 PM PST     Sunset
Sat -- 06:13 PM PST     0.76 knots Max Flood
Sat -- 09:04 PM PST     -0.01 knots Slack
Sat -- 11:23 PM PST     -0.71 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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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 (18,4,5,8)
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Ground Weather Radar Station Sacramento, CA
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