Tuesday, September28, 2021
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Marine Weather and Tides
Diablo Grande, CA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:57AMSunset 6:55PM Monday September 27, 2021 9:57 PM PDT (04:57 UTC) Moonrise 9:56PMMoonset 12:23PM Illumination 57% Phase: Waning Gibbous; Moon at 21 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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PZZ531 San Francisco Bay South Of The Bay Bridge- 907 Pm Pdt Mon Sep 27 2021
.small craft advisory in effect from Tuesday afternoon through Tuesday evening...
Tonight..W winds 10 to 15 kt. A slight chance of rain.
Tue..NW winds 15 to 20 kt with gusts up to 30 kt.
Tue night..W winds 15 to 20 kt with gusts up to 30 kt.
Wed..W winds 10 to 15 kt.
Wed night..NW winds around 5 kt.
Thu..W winds 10 to 15 kt.
Fri..W winds 5 to 10 kt.
PZZ500 907 Pm Pdt Mon Sep 27 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds have returned to the waters. Locally stronger winds are forecast to persist along the big sur coast south of point sur. Winds will then gradually strengthen later on Tuesday and remain elevated through mid to late week. Mixed seas remain with a moderate period northwest swell and a longer period southerly swell. An additional larger northwest swell will arrive tonight with seas quickly building into Tuesday. The combination of stronger winds and building swell will result in hazardous seas conditions, particularly for smaller vessels. Seas will begin to subside on Wednesday.


7 Day Forecast for Marine Location Near Diablo Grande, CA
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location: 37.52, -121.45     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 280045 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 545 PM PDT Mon Sep 27 2021

SYNOPSIS. After some light rain this morning due to pre-frontal showers, a weak front is now entering North Bay and will spread additional light rain across the region through tonight. Breezy to locally gusty onshore winds during the frontal passage are expected today followed by a brief period of breezy to locally gusty offshore winds on Tuesday. Temperatures will be below seasonal averages through Tuesday. A gradual warming and drying trend is then expected for the latter half of the week with lighter winds.

DISCUSSION. as of 02:30 PM PDT Monday . Current radar shows a SW-NE oriented band of showers over the Pacific Ocean and stretching into NorCal this afternoon. That band has recently moved into the NW portion of Sonoma County and is expected to spread across the Bay Area this afternoon into tonight. Total amounts are still expected to only peak around a tenth of an inch for higher elevations with less than a tenth of an inch in lower elevations, but we could see locally higher amounts along the coast. For example: the Sea Ranch gauge is already showing 0.15" which is our highest total so far. The highest confidence for rain is along the North Bay coastline and SF Peninsula, but hi- res models continue to show spotty, light showers possible in the East & South Bay as well as farther south into the Monterey Bay region. Have added slight chance POPs to the southern Monterey Bay coastal area in case we get a brief shower later tonight. Most shower activity should end by midnight tonight or shortly after that. This weak cold front will keep our temperatures at below seasonal values and the coldest time this week should be early Wednesday morning when overnight lows dip down into the low 40s to low 50s.

Another hazard to highlight tonight into tomorrow night is that we have a building NW swell that will impact our beaches. Please see the BEACHES discussion below.

Breezy to locally gusty onshore winds today and tonight will then transition to northerly, offshore winds Tuesday morning as the trough moves eastward. These winds will also be breezy to locally gusty, especially for the Napa hills and into the East Bay hills with gusts peaking around 25 to 35 mph. For Tuesday, we should still have a fair bit of lingering moisture from today's frontal passage to keep fire weather concerns at bay. However, north winds will continue into midweek as a ridge develops over our region and puts us into a warm/dry trend for the rest of the week. Therefore, we'll be looking more closely at fire weather concerns on Wed and Thurs to nail down details on when the north winds weaken and how that plays out with drier/warmer conditions.

With the ridge strengthening on Thursday, that will bring daytime highs a little above normal with 70s near the coast and up to to the low 90s inland. Dry and warm conditions continue through the weekend with only slight oscillations in temperatures between Thursday into Sunday.

AVIATION. as of 5:30 PM PDT Monday . For the 00z TAFs. A cold front moving over the North Bay area this afternoon, giving KSTS/KAPC chances for RA through 04Z. Visibilities will be reduced for the RA passing to around 2-3SM. SCT-BKN015-035 are currently ahead of the front at KOAK/KSFO. VCSH/-RA will move into the Bay Area around 05Z, and linger until 09Z. The front will weaken as it moves south. KSNS/KMRY will have the lowest chances for RA, and will more likely see VCSH starting around 08Z. As RA clears out of KSTS/KAPC tonight, BR/FG is highly likely and will bring in IFR visibilities and ceilings from 10-15Z. VFR skies behind the front for tomorrow, with breezy northwest winds. Winds will become gusty near KSFO/KSTS/KSNS tomorrow afternoon.

Vicinity of KSFO . A FROPA will bring -RA and VCSH to the Bay Area later tonight. MVFR ceilings will move in around 05Z, and RA should start around 06-07Z. Patchy BR possible with potential 4SM visibilities lasting a few hours after the RA ends. After 12Z, skies will clear out to SKC. Breezy northwest winds tomorrow afternoon, with gusts up to 24kts.

KSFO Bridge Approach . Similar to KSFO.

Monterey Bay . Low clouds are bring pushed inland over KSNS ahead of approaching FROPA. The front will pass over later tonight, around 08-10Z. There is a chance for BR/DZ ahead of front at KMRY starting around 05-06Z. Higher confidence in DZ/VCSH, as front breaks up by the time it reaches KMRY/KSNS. VFR ceilings tomorrow morning and afternoon, with breezy northwest winds.

MARINE. as of 02:30 PM PDT Monday . South to southwest winds will continue ahead of a weak cold front moving through the coastal waters. Northwest winds will then quickly return by this evening in the wake of the frontal passage. Locally stronger winds are forecast to persist along the Big Sur coast south of Point Sur. Winds will then gradually strengthen later on Tuesday and remain elevated through mid to late week. Mixed seas remain with a moderate period northwest swell and a longer period southerly swell. An additional larger northwest swell will arrive tonight with seas quickly building into Tuesday. The combination of stronger winds and building swell will result in hazardous seas conditions, particularly for smaller vessels. Seas will begin to subside on Wednesday.

BEACHES. After a fairly quiet summer in terms of swell, the first larger northwest swell of the season will arrive tonight. Swell heights of 8 to 10 feet at 13 to 15 seconds are forecast. Expect an increased risk of moderate to large breaking waves (13 to 17 feet) and stronger rip currents. Additionally, increasing winds behind a cold frontal passage in combination with this building swell may cause waves to run up farther along area beaches than usual. Waves will be capable of knocking down beach goers with a risk of being dragged into the cold turbulent ocean waters. Therefore, a Beach Hazards Statement has been issued from 11 PM Monday to 11 PM Tuesday. This hazard is primarily for west to northwest facing beaches. Caution is urged, and it is recommended to stay off of rocks and jetties. Never turn your back to the ocean. Northwest swell will gradually subside on Wednesday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm SCA . Mry Bay until 9 PM SCA . Mry Bay from 9 AM SCA . SF Bay from 3 PM



PUBLIC FORECAST: Bingaman AVIATION: Dhuyvetter MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 40 mi57 min W 12 G 13 64°F 1018.6 hPa (+1.5)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 43 mi57 min WNW 7 G 15 66°F 1015.7 hPa (+0.9)
AAMC1 - 9414750 - Alameda, CA 48 mi57 min W 5.1 G 7 62°F 67°F1017.8 hPa (+0.5)
LNDC1 48 mi57 min W 4.1 G 6 63°F 1017.3 hPa (+0.4)
PCOC1 - 9415144 - Port Chicago, CA 48 mi57 min WSW 9.9 G 13 65°F 69°F1016.4 hPa (+0.9)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Livermore, Livermore Municipal Airport, CA23 mi64 minW 710.00 miOvercast64°F59°F84%1016.7 hPa
San Jose / Reid / Hillv, CA23 mi67 minN 1010.00 miMostly Cloudy66°F57°F73%1017.6 hPa

Link to 5 minute data for KLVK

Wind History from LVK (wind in knots)
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Last 24hrW12W9W8S4CalmS4S5SW4SW6S5S5SW7SW66W8W10W8W9W17W13
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1 day agoNW8W11W9W10W8W9W5W9W7W7W5W54W6NW8W9W12W12W14NW12W14W14W16W15
2 days agoCalmCalmW4W6W4NW4W6NW5CalmNW3W5W33NW53SW43NW6NW11W11NW10NW13NW9NW11

Tide / Current Tables for Grant Line Canal (drawbridge), Old River, California
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Grant Line Canal (drawbridge)
Click for Map
Tue -- 12:23 AM PDT     3.48 feet High Tide
Tue -- 06:59 AM PDT     Sunrise
Tue -- 09:03 AM PDT     0.38 feet Low Tide
Tue -- 02:19 PM PDT     Moonset
Tue -- 03:44 PM PDT     2.58 feet High Tide
Tue -- 06:52 PM PDT     Sunset
Tue -- 06:58 PM PDT     Last Quarter
Tue -- 07:57 PM PDT     1.61 feet Low Tide
Tue -- 11:41 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.53.43.22.72.21.61.10.70.50.40.50.81.31.82.22.52.62.421.71.61.72.12.6

Tide / Current Tables for Brandt Bridge, San Joaquin River, California Current
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Brandt Bridge
Click for Map
Tue -- 12:55 AM PDT     -0.00 knots Slack
Tue -- 04:54 AM PDT     -0.99 knots Max Ebb
Tue -- 06:58 AM PDT     Sunrise
Tue -- 10:00 AM PDT     0.00 knots Slack
Tue -- 01:24 PM PDT     0.45 knots Max Flood
Tue -- 02:19 PM PDT     Moonset
Tue -- 04:01 PM PDT     -0.00 knots Slack
Tue -- 06:39 PM PDT     -0.30 knots Max Ebb
Tue -- 06:52 PM PDT     Sunset
Tue -- 06:58 PM PDT     Last Quarter
Tue -- 09:00 PM PDT     0.00 knots Slack
Tue -- 11:29 PM PDT     0.47 knots Max Flood
Tue -- 11:41 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.3-0-0.4-0.7-0.9-1-0.9-0.8-0.6-0.3-00.20.40.40.40.30-0.2-0.3-0.3-0.2-00.30.4

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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