Sunday, December15, 2019
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Marine Weather and Tides
Petaluma, 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 7:18AMSunset 4:52PM Sunday December 15, 2019 11:19 AM PST (19:19 UTC) Moonrise 8:40PMMoonset 10:29AM Illumination 83% 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- 824 Am Pst Sun Dec 15 2019
.small craft advisory in effect until 9 am pst this morning...
Today..NW winds 5 to 15 kt. Gusts up to 25 kt this morning.
Tonight..NW winds 5 to 15 kt.
Mon..NE winds 5 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 10 to 20 kt with gusts up to 25 kt. A chance of rain.
Wed..E winds around 5 kt. A chance of rain.
Thu..SE winds 5 to 10 kt. A chance of rain.
PZZ500 824 Am 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 be breezy today 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 this 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 Petaluma, CA
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location: 38.22, -122.6     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 151725 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 925 AM PST Sun Dec 15 2019

SYNOPSIS. A few isolated showers linger off the coast during the early morning but are forecast to dissipate later in the day. The early part of the week provides cooler, drier conditions. Unsettled conditions return by midweek and potentially again late next weekend.

DISCUSSION. as of 08:27 AM PST Sunday . Spotty showers continue this morning just off the coast over the Pacific. As the upper level trough has moved east of the Bay Area driving drier, north- northwesterly flow, the chances for precipitation are low. Moisture lingers allowing for some clouds to linger today, but the colder air from the north will limit heating and provides widespread 50s across the region. Limited cloud cover added to cold air advection will allow for temperatures to cooler overnight. Most areas in the region should be in the low-40s, but isolated locations in the North Bay Valleys, East Bay Valleys and Southern Interior Monterey County will drop just above freezing in the mid- 30s.

The lower morning temperatures will bottom out on Monday morning and a slight warming trend will take place as high pressure grows while an upper level ridge builds to our west. The next upper level trough moves in by midweek. The forecast remains on track thus far as models are showing the next chance for light to moderate rainfall around the Bay Area and the Central Coast by Tuesday night into Wednesday. The trough-ridge-trough pattern continues allowing high pressure and another ridge to build by the end of the work week while temperatures remain seasonable. In the not too distant future, models are hinting at another system on Saturday night that could bring rain to the region.

PREV DISCUSSION. as of 03:23 AM PST Sunday . Lingering moisture in a northwest flow continues to result in isolated showers near coastal areas early this morning. Meanwhile, cold air advection has resulted in a region-wide cool down in wake of the passing of the main mid/upper level trough. As flow aloft turns more northerly through sunrise, look for showers to diminish in coverage with partly cloudy to mostly clear sky conditions developing through the day. Daytime temperatures will generally warm into the 50s for most urban areas and hold in the 40s in the higher elevations across the region.

Low level conditions will dry out even more so tonight into Monday resulting in even colder overnight conditions. With light winds and mainly clear sky conditions, temperatures will drop into the lower/middle 30s for most interior locations and into the upper 30s to lower 40s even near the coast by Monday morning. These will be some of the coldest temperatures of the month so far. Patchy frost will be possible with a few hours of freezing temperatures in the region's coldest interior locations. Other than an increase in high level clouds beginning Monday night into Tuesday, similar weather conditions are likely with highs in the 50s and lows in the 30s to 40s.

The forecast models continue to indicate an increase in moisture associated with a mid/upper level system approaching the region late Tuesday into Wednesday. This system has the potential to produce widespread rainfall, generally light to moderate in nature across portions of the region. However, there remains some uncertainty with respect to the exact track of this system, available moisture and mid/upper level support. Regardless, unsettled conditions are likely to return to much of the region by midweek. As that mid/upper level system shifts inland late in the week, a deeper plume of atmospheric moisture is forecast to take aim at the Pacific Northwest and/or far northern California with mainly dry conditions across our region. However, depending on the exact track of the deeper moisture advection, cannot rule out light rain over the far northern portions of the North Bay late in the week.

Unsettled weather conditions are then looking likely by late next weekend as a mid/upper level system approaches the region and pushes the deeper moisture plume southward in the form of a frontal system. Details remain difficult to nail down at this time, yet widespread rainfall looks possible Stay tuned.

AVIATION. as of 9:25 AM PST Sunday . For 18Z TAFs. VFR conditions are expected today. Some low level moisture remains with mainly FEW/SCT cumulus with bases 3000-5000 feet. Late this morning and afternoon cumulus will likely become more numerous over the terrain as the surface warms. Northwest winds have generally subsided since yesterday. Northwest winds mainly 5-10 kt today.

Vicinity of KSFO . VFR. Winds increasing to 10-15 kt this afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR through the period. W to NW winds 5-10 kt expected through the day today.

MARINE. as of 08:27 AM PST Sunday . Northwest winds will be breezy today 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 this evening, particularly for smaller vessels. Southerly winds will return later on Monday ahead of the next weather system.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. 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



PUBLIC FORECAST: RGass/DK AVIATION: Sims MARINE: Sims

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 21 mi49 min NW 5.1 G 8 51°F 1024.1 hPa
RCMC1 - 9414863 - Richmond, CA 23 mi49 min 55°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 24 mi38 min N 6 51°F 1024 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 25 mi49 min NNW 7 G 11 53°F 1024.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 25 mi49 min 54°F1024.4 hPa
UPBC1 28 mi49 min WNW 8.9 G 12
MZXC1 - 9415102 - Martinez-Amorco CA 28 mi49 min W 9.9 G 11 50°F 53°F1024.1 hPa
FTPC1 - 9414290 - San Francisco, CA 29 mi55 min W 8 G 12 52°F 55°F1024.4 hPa
46237 - San Francisco Bar, CA (142) 30 mi49 min 55°F7 ft
SFXC1 - San Francisco Bay Reserve, CA 30 mi94 min W 4.1 51°F 1023 hPa40°F
PXSC1 31 mi49 min 53°F 43°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 31 mi49 min W 4.1 G 8.9 54°F 1023.3 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 32 mi49 min NNW 7 G 9.9
PCOC1 - 9415144 - Port Chicago, CA 32 mi49 min W 8 G 9.9 50°F 53°F1023.8 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 32 mi49 min N 8.9 G 11 52°F 1024.3 hPa
OBXC1 32 mi49 min 53°F 43°F
LNDC1 34 mi49 min N 7 G 8.9 52°F 1024.3 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi29 min NNW 9.7 G 14 53°F 9 ft1025.1 hPa
AAMC1 - 9414750 - Alameda, CA 35 mi49 min 55°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 37 mi29 min NW 12 G 16 55°F10 ft1024.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 40 mi49 min WNW 8 G 11 52°F 1023.8 hPa

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petaluma Municipal Airport, CA3 mi44 minVar 510.00 miFair52°F46°F82%1024.7 hPa
Novato / Gnoss Field, CA6 mi24 minNNW 10 G 1610.00 miFair55°F42°F63%1024.4 hPa
Napa, Napa County Airport, CA17 mi25 minNNW 310.00 miFair51°F41°F69%1023.2 hPa
Santa Rosa, Santa Rosa Sonoma County Airport, CA23 mi26 minN 310.00 miA Few Clouds53°F44°F72%1023.6 hPa

Link to 5 minute data for KO69

Wind History from O69 (wind in knots)
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W13W14W6W4NW5W44NW4NW4W4W5CalmCalmCalmCalmCalmNW3CalmNW4
1 day agoW5CalmCalmCalmCalmW4CalmW8CalmCalmW10W8W85
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2 days agoCalmNW44CalmCalmCalmCalmCalmCalmCalmW4W4CalmCalmCalmCalmCalmW3W4CalmCalmCalmCalmW4

Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
Click for Map
Sun -- 04:45 AM PST     5.67 feet High Tide
Sun -- 07:19 AM PST     Sunrise
Sun -- 10:08 AM PST     2.53 feet Low Tide
Sun -- 10:28 AM PST     Moonset
Sun -- 03:07 PM PST     7.07 feet High Tide
Sun -- 04:51 PM PST     Sunset
Sun -- 08:39 PM PST     Moonrise
Sun -- 10:59 PM PST     -0.72 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.41.83.34.65.55.65.24.43.62.82.52.83.95.26.47.16.96.253.41.80.4-0.4-0.7

Tide / Current Tables for Petaluma River Approach, San Pablo Bay, California Current
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Petaluma River Approach
Click for Map
Sun -- 12:21 AM PST     0.58 knots Max Flood
Sun -- 04:30 AM PST     -0.00 knots Slack
Sun -- 06:25 AM PST     -0.29 knots Max Ebb
Sun -- 07:18 AM PST     Sunrise
Sun -- 08:48 AM PST     0.00 knots Slack
Sun -- 10:27 AM PST     Moonset
Sun -- 11:23 AM PST     0.65 knots Max Flood
Sun -- 02:30 PM PST     -0.01 knots Slack
Sun -- 04:50 PM PST     Sunset
Sun -- 05:56 PM PST     -1.02 knots Max Ebb
Sun -- 08:39 PM PST     Moonrise
Sun -- 10:18 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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0.60.60.50.30.1-0.1-0.3-0.3-0.20.10.40.60.60.40.2-0.2-0.6-0.9-1-0.9-0.7-0.5-0.10.3

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

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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 Sacramento, CA
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