Monday, July13, 2020
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Marine Weather and Tides
Petaluma, CA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 5:57AMSunset 8:35PM Monday July 13, 2020 7:52 PM PDT (02:52 UTC) Moonrise 12:08AMMoonset 1:11PM Illumination 38% Phase: Third Quarter Moon; Moon at 23 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- 232 Pm Pdt Mon Jul 13 2020
.small craft advisory in effect until 11 pm pdt this evening...
.small craft advisory in effect from Tuesday morning through Tuesday evening...
Tonight..W to sw winds 15 to 25 kt...decreasing to 5 to 15 kt overnight.
Tue..W to sw winds 5 to 15 kt...increasing to 15 to 25 kt in the afternoon.
Tue night..SW winds 5 to 15 kt.
Wed..SW winds 5 to 15 kt.
Wed night..SW winds 5 to 15 kt.
Thu..SW winds 5 to 15 kt.
Thu night..SW winds 5 to 15 kt.
Fri..SW winds 5 to 15 kt.
Sat..SW winds 5 to 15 kt.
PZZ500 232 Pm Pdt Mon Jul 13 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Moderate to locally strong northwest winds will persist over the northern and outer coastal waters through Tuesday. These winds will generate steep fresh swell resulting in hazardous conditions for small craft vessels. Additionally, winds will be strong from the golden gate through the delta. By midweek, a nearly stationary low pressure trough will develop over the coastal waters and cause winds to shift to a southerly direction mainly over the southern and inner coastal waters. A longer period south swell will mix with the steep fresh northwest swell.


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 132354 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 454 PM PDT Mon Jul 13 2020

SYNOPSIS. Interior areas are forecast to cool through midweek as onshore flow increases and high pressure weakens. Temperatures will then likely remain near seasonal averages for the remainder of the week and into next weekend. Expect increasing night and morning low clouds through midweek.

DISCUSSION. as of 03:00 PM PDT Monday . Marine layer is up to around 1700ft on the Fort Ord Temperature Profiler as boundary layer conditions return to what is typically expected for early- to-mid July.

The 596dm 500mb upper-level ridge has trekked eastward into the Texas Panhandle. Low-clouds and fog dissipated from northwestern Alameda county, most the Bay, and the Salinas Valley since this morning but are still widespread along the coast, with stratus inclusion along the Golden Gate and all the way down to Monterey Bay. A small clearing is visible over Santa Cruz and most of coastal Santa Cruz county owing to the onshore flow.

Min temps across the interior were observed in the upper 50s to low 60s F range with higher-elevation areas like those up in the East Hills just barely making it into the low 60s F. This a sharp contrast from the 70s F that were observed on Saturday and Sunday Morning.

Troughing over the Western Canadian Prairies and the Pacific Northwest has reintroduced onshore flow that is typical for this time of the year. Expect cooling trend across the interior, where max temps are progged to be 7 to 12 degrees F lower than yesterday's. As we head into Tuesday and Wednesday, off-shore cyclonic flow will increase, resulting in southerly flow near the surface which will allow for more cooling to occur along the coast. Due to this setup we should also expect the marine layer to continue to build and for lower morning ceilings as the workweek progresses.

Another disturbance is set to develop off the Gulf of Alaska and make its way down the Alexander Archipelago, with its axis expected to be over Vancouver Island sometime Thursday morning/afternoon. As the weaker upper-level ridge sits over the Texas Panhandle, it will introduce anticyclonic flow that, combined with the offshore cyclonic flow from the upper-level trough will result in the first slug of monsoonal activity for the CWA and surrounding areas. The added moisture may potentially lead to the development of accus across the North Bay Thursday afternoon as an unstable air mass develops east of our CWA and along the Sierra. Confidence is currently high that we do not expect any major dry lightning concerns from this setup over our CWA, but it is a setup that we'll be monitoring as we get closer to Thursday. For now, the possibility for some accus could make for dazzling sunsets over parts of our CWA.

Going into the weekend, expecting some onshore flow to continue and for a slight uptick in temps across the interior as model guidance suggests that a strong upper- level ridge will begin building off the coast ahead of the departing disturbance.

AVIATION. as of 4:52 PM PDT Monday . for 00z TAFs. VFR inland with stratus clouds hugging the coastline allowing for a few clouds over the SF Bay and MVFR conditions over the Monterey Peninsula. Winds remain onshore and breezy, with stronger gusts around 20 kts at several terminals. An earlier and more widespread return of low clouds for IFR conditions is forecast tonight, through 17z on Tuesday. Winds will reduce somewhat overnight, but remain onshore. VFR forecast for Tuesday afternoon as onshore winds increase.

Vicinity of KSFO . A FEW clouds linger around terminals as winds remain breezy with occasional stronger gusts. With the marine layer continuing to deepen, the forecast remains with chances of lower clouds at the terminal in the early morning hours of Tuesday. Winds will remain breezy through the TAF period. VFR forecast for Tuesday afternoon as increasing winds out of the northwest can be expected.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . MVFR as stratus clouds sit inside Monterey Bay and are slowly nudging into the Salinas Valley. Expect cigs to lower and provide IFR conditions and patchy overnight. Clouds are expected to linger on Tuesday, but lift to MVFR levels as winds increase, with stronger gusts expected in the Salinas Valley.

MARINE. as of 02:32 PM PDT Monday . Moderate to locally strong northwest winds will persist over the northern and outer coastal waters through Tuesday. These winds will generate steep fresh swell resulting in hazardous conditions for small craft vessels. Additionally, winds will be strong from the Golden Gate through the Delta. By midweek, a nearly stationary low pressure trough will develop over the coastal waters and cause winds to shift to a southerly direction mainly over the southern and inner coastal waters. A longer period south swell will mix with the steep fresh northwest swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . SF Bay until 11 PM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 6 PM



PUBLIC FORECAST: Diaz/DP AVIATION: DK MARINE: MM

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RCMC1 - 9414863 - Richmond, CA 23 mi142 min 66°F
TIBC1 - Tiburon Pier, San Francisco Bay, CA 24 mi42 min WSW 8 56°F 1011 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 28 mi142 min 74°F
FTPC1 - 9414290 - San Francisco, CA 29 mi142 min 62°F
46237 - San Francisco Bar, CA (142) 30 mi52 min 57°F4 ft
SFXC1 - San Francisco Bay Reserve, CA 30 mi67 min W 14
PCOC1 - 9415144 - Port Chicago, CA 32 mi142 min 74°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 35 mi32 min W 9.7 G 12 55°F 55°F1012.6 hPa53°F
AAMC1 - 9414750 - Alameda, CA 35 mi142 min 71°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 37 mi32 min NW 18 G 23 54°F 51°F1010.4 hPa51°F

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petaluma Municipal Airport, CA3 mi3.6 hrsNNW 810.00 miFair79°F57°F48%1010.5 hPa
Novato / Gnoss Field, CA6 mi57 minN 610.00 miFair73°F55°F53%1009.8 hPa
Napa, Napa County Airport, CA17 mi58 minS 15 G 2210.00 miFair63°F54°F73%1009.3 hPa
Santa Rosa, Santa Rosa Sonoma County Airport, CA23 mi59 minS 87.00 miFair70°F53°F55%1009.1 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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Last 24hrS56E4CalmCalmN4CalmCalmCalmCalmCalmS33CalmSE8SE7E8E9E9SE7SE10Calm4
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1 day agoN6N6N7N5NW4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSE5CalmE566
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2 days agoE5CalmN6NW6N3CalmCalmCalmCalmCalmCalmCalmN4CalmCalm5SE44
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Tide / Current Tables for Upper drawbridge, Petaluma River, San Pablo Bay, California
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Upper drawbridge
Click for Map
Mon -- 01:07 AM PDT     Moonrise
Mon -- 04:10 AM PDT     1.57 feet Low Tide
Mon -- 05:58 AM PDT     Sunrise
Mon -- 08:47 AM PDT     4.21 feet High Tide
Mon -- 02:11 PM PDT     Moonset
Mon -- 03:20 PM PDT     1.44 feet Low Tide
Mon -- 08:33 PM PDT     Sunset
Mon -- 09:12 PM PDT     6.25 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.13.12.31.81.61.82.53.444.243.62.92.31.71.51.62.33.44.75.76.26.15.6

Tide / Current Tables for Petaluma River Approach, San Pablo Bay, California Current
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Petaluma River Approach
Click for Map
Mon -- 01:07 AM PDT     Moonrise
Mon -- 03:01 AM PDT     0.00 knots Slack
Mon -- 05:23 AM PDT     0.34 knots Max Flood
Mon -- 05:58 AM PDT     Sunrise
Mon -- 08:16 AM PDT     -0.00 knots Slack
Mon -- 11:07 AM PDT     -0.52 knots Max Ebb
Mon -- 02:10 PM PDT     Moonset
Mon -- 02:16 PM PDT     0.00 knots Slack
Mon -- 05:02 PM PDT     0.66 knots Max Flood
Mon -- 08:32 PM PDT     Sunset
Mon -- 08:53 PM PDT     -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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-0.6-0.5-0.3-00.20.30.30.20.1-0.2-0.4-0.5-0.5-0.3-0.10.30.60.70.60.50.2-0-0.4-0.6

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (22,6,7,8)
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Ground Weather Radar Station Sacramento, CA
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