Sunday, February28, 2021
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Marine Weather and Tides
Napa, CA

Version 3.4
NOTICE
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 6:40AMSunset 6:02PM Sunday February 28, 2021 8:33 PM PST (04:33 UTC) Moonrise 7:53PMMoonset 7:51AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 240 Pm Pst Sun Feb 28 2021
This afternoon..NE winds 5 to 10 kt.
Tonight..NE winds 5 to 10 kt.
Mon..SW winds 5 to 10 kt.
Mon night..W winds up to 10 kt.
Tue..N winds 5 to 10 kt.
Tue night..NW winds 5 to 10 kt.
Wed..W winds 5 to 15 kt.
Thu..SW winds up to 10 kt.
PZZ500 240 Pm Pst Sun Feb 28 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... North winds have decreased with locally breezy conditions lingering in the outer waters this afternoon. Lighter winds will persist tonight, Monday, and most of Tuesday with locally breezy southerly winds alongshore beginning early Monday. A moderate period northwest swell persists through the early week.


7 Day Forecast for Marine Location Near Napa, CA
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location: 38.3, -122.28     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 282356 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 356 PM PST Sun Feb 28 2021

SYNOPSIS. Mild afternoon with light winds and clear skies. Most of the San Francisco Bay Area and Central Coast is forecast to remain relatively mild and dry through much of next week before rain chances potentially return for the first weekend of March.

DISCUSSION. as of 01:41 PM PST Sunday . GOES-WEST Air Mass RGB Composite across the Pacific visually captures subtropical moisture ~25N streaming into the tip of Baja while a trough over the Gulf of Alaska slowly dampens the upper-level ridge centered at ~140W this afternoon. Closer to home, are observing mild temperatures this afternoon with light winds in contrast to the gustier candidness along the foothills and up into the higher peaks earlier this morning. Skies for the most part remain clear with only a handful of high-base clouds across the region.

Another night with widespread mins in the 40s F across the region is expected tonight while some of the interior valleys, particularly in the North Bay, will drop down to the mid to upper 30s F owing to greater air flow blockage. Warmest overnight spots will be concentrated along the Bay Shoreline, where temps in the mid 40s F are expected by dawn tomorrow. Looking at another mild day on Monday with widespread upper 60s F and even some low 70s F across the interior.

The trough over the Gulf of Alaska will eventually track south as the upper-level ridge retrogrades westward between today and Wednesday. It will quickly take on a cut-off low signature as it disassociates from the mid-level zonal flow at ~50N and track south and parallel to the California Coast. While GEFS and Canadian ensemble members have kept the low slightly closer to the shoreline during this portion of its trajectory, EC members, along with SREF guidance, are in greater agreement that the system will stay farther out to sea. Nonetheless, even the closest solutions remain well offshore. This makes synoptic sense given that the departure of the upper-level ridge from the immediate coast will result in a favorable environment for the low to deepen right along the original center of the ridge. Given its nature as a cutoff low, however, its trajectory will inevitably get shifted onto more of an eastward track as it encounters the zonal flow from the subtropical moisture. And while such a setup will translate into some moisture returns for SoCal, the system will be too far to the south of us for any of that moisture to make it up into our neck of the woods.

Given the current outlook, looking at a dry, calm, and mild pattern Tuesday through Thursday, with afternoon highs in the upper 50s F to low-to-mid 60s F along the Coast, mid-to-upper 60s F along the Bay Shoreline, and low 70s F in more favorable interior locations. Nighttime lows will generally drop down into the 40s although, as tends to be the case, the interior valleys will likely drop down into the mid-30s F and we may see some areas of patchy frost as a result. The only locations within our CWA that might see any sprinkles out of this will be down along the extreme southern portions of the Big Sur coast for Tuesday afternoon. That being said, some of that southerly flow (albeit rather dry) associated with the cutoff low will eventually advect across our waters as early as Monday afternoon, which should act as a coolant for the south-facing portions of the Coast all the way through Wednesday.

Turning our attention over to next weekend, day 3-7 clusters pick up on some uncertainties between the EC, Canadian, and GFS ensemble members: namely the timing and amplitude of the next trough that will replace the cutoff low. GEFS members are leaning towards a less amplified trough and a delayed start time to the showers until around late Friday/early Saturday, while EC ensemble members prefer a deeper trough and a faster moisture return that would bring showers into the CWA as early as Friday afternoon. Biggest reason for these uncertainties lies with the amount and timing of upper- level wave momentum transfer that occurs between Siberia to Alaska. A faster-paced transfer would allow for the upper-level ridge that will have retrograded to the northcentral PAC by midweek to continue to build westward towards Japan which in turn would result in the EC ensemble mean solution to play out, while a slower-paced transfer would favor the GEFS mean solution. It should also be noted that the main driver for the available moisture in this setup will be the culmination of the position of the upper-level trough along ~140W and its ability to tap into subtropical moisture to its south. This means the EC mean solution is also the most favorable for higher precip totals. Disagreements will hopefully lessen as we get closer to the event, but for now looking like we have fair agreement with regards to the potential for some rain next weekend starting either Friday afternoon or late Friday evening and going into Saturday.

All in all, this synoptic-scale shift in the oceanic pattern coincides with what would be expected under a negative PNA index as troughing becomes the more dominant synoptic-scale feature across the northeast PAC. EC weeklies continue to trend negative, suggesting a wetter pattern for the West Coast through the first half of March.

AVIATION. as of 03:56 PM PST Sunday . For the 00Z TAFs. VFR across terminals with light N to NE winds. Clear skies observed on satellite. Overnight, continued clear skies and light winds. A bit breezier Monday afternoon with southerly flow developing, and perhaps few high clouds. Vicinity of KSFO . VFR. Light northerly winds backing to the WNW through early evening, then light and variable overnight. Southerly winds develop Monday afternoon. VFR through the taf period. SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR with light to breezy onshore winds. Overnight, light and variable, becoming ESE. Continued VFR through the period.

MARINE. as of 02:40 PM PST Sunday . North winds have decreased with locally breezy conditions lingering in the outer waters this afternoon. Lighter winds will persist tonight, Monday, and most of Tuesday with locally breezy southerly winds alongshore beginning early Monday. A moderate period northwest swell persists through the early week.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. None.

PUBLIC FORECAST: Diaz AVIATION: Lorber MARINE: Bingaman

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 15 mi108 min ESE 7 53°F 1022 hPa33°F
CQUC1 16 mi44 min 55°F
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 17 mi45 min ENE 5.1 G 5.1 58°F 1021.1 hPa
UPBC1 20 mi45 min ESE 6 G 7
MZXC1 - 9415102 - Martinez-Amorco CA 20 mi45 min Calm G 1.9 56°F 55°F1021.6 hPa
PCOC1 - 9415144 - Port Chicago, CA 21 mi45 min E 1.9 G 1.9 58°F 55°F1021.3 hPa
RCMC1 - 9414863 - Richmond, CA 27 mi51 min W 1.9 G 4.1 57°F 54°F1021.4 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 28 mi45 min SSW 1 G 1.9 56°F 1021.4 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 28 mi45 min SSW 6 G 8.9 57°F 1021.8 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 30 mi52 min Calm 55°F 1021 hPa
OBXC1 34 mi45 min 57°F 37°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 34 mi45 min WSW 1.9 G 4.1 58°F 1021.6 hPa
PXSC1 35 mi45 min 58°F 31°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 35 mi45 min WSW 5.1 G 8 58°F 1020.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 35 mi45 min W 5.1 G 8.9
LNDC1 35 mi45 min WNW 2.9 G 5.1 57°F 1021.5 hPa
FTPC1 - 9414290 - San Francisco, CA 36 mi45 min WSW 8 G 12 55°F 54°F1021.6 hPa
AAMC1 - 9414750 - Alameda, CA 37 mi45 min 56°F
46237 - San Francisco Bar, CA (142) 40 mi63 min 52°F4 ft
PRYC1 - 9415020 - Point Reyes, CA 42 mi45 min 50°F1022.1 hPa
BDXC1 42 mi39 min 60°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 48 mi33 min WNW 7.8 G 9.7 50°F1022.2 hPa (+0.4)

Wind History for Union Pacific Rail Road Bridge (UPRR), CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Napa, Napa County Airport, CA6 mi39 minESE 810.00 miFair57°F33°F41%1020.4 hPa
Petaluma Municipal Airport, CA17 mi38 minN 410.00 miFair46°F32°F57%1022 hPa
Vacaville Nut Tree Airport, CA18 mi40 minSSW 310.00 miFair47°F32°F56%1021.9 hPa
Novato / Gnoss Field, CA18 mi58 minNNW 410.00 miFair45°F36°F71%1021.7 hPa
Fairfield / Travis Air Force Base, CA19 mi35 minSSE 510.00 miFair44°F31°F60%1022.4 hPa

Link to 5 minute data for KAPC

Wind History from APC (wind in knots)
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Last 24hrN10N9N8NE3N8CalmNE4N9NE6CalmSE53NE4N6N10N8NE11
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1 day agoW6W7CalmSE3S4S3CalmNW4CalmSE4SE3CalmCalmS3SW6NW10
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2 days agoS4E3N3CalmCalmCalmCalmE3CalmCalmCalmCalmCalmCalm3SW4W16W11W15
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Tide / Current Tables for Napa, Napa River, Carquinez Strait, California
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Napa
Click for Map
Sun -- 02:47 AM PST     6.88 feet High Tide
Sun -- 06:41 AM PST     Sunrise
Sun -- 07:50 AM PST     Moonset
Sun -- 08:40 AM PST     1.52 feet Low Tide
Sun -- 02:17 PM PST     7.53 feet High Tide
Sun -- 06:01 PM PST     Sunset
Sun -- 07:52 PM PST     Moonrise
Sun -- 09:07 PM PST     -0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.85.46.66.96.35.23.82.51.71.62.33.75.36.77.57.46.553.21.50.3-0.20.21.4

Tide / Current Tables for Mare Island Strait, So Vallejo, San Pablo Bay, California Current
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Mare Island Strait
Click for Map
Sun -- 02:40 AM PST     -0.00 knots Slack
Sun -- 04:44 AM PST     -1.60 knots Max Ebb
Sun -- 06:41 AM PST     Sunrise
Sun -- 07:50 AM PST     Moonset
Sun -- 08:11 AM PST     0.00 knots Slack
Sun -- 11:24 AM PST     1.66 knots Max Flood
Sun -- 02:19 PM PST     -0.00 knots Slack
Sun -- 04:40 PM PST     -2.42 knots Max Ebb
Sun -- 06:01 PM PST     Sunset
Sun -- 07:52 PM PST     Moonrise
Sun -- 08:40 PM PST     0.00 knots Slack
Sun -- 11:53 PM PST     1.74 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.20.5-0.4-1.4-1.6-1.4-0.9-0.20.61.31.61.61.10.3-1-2.2-2.4-2.1-1.5-0.70.31.11.6

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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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