Thursday, October21, 2021
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Marine Weather and Tides
Thermalito, 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 7:21AMSunset 6:19PM Thursday October 21, 2021 2:38 PM PDT (21:38 UTC) Moonrise 6:06PMMoonset 7:20AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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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7 Day Forecast for Marine Location Near Thermalito, CA
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location: 39.56, -121.59     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 212134 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 234 PM PDT Thu Oct 21 2021

SYNOPSIS. Two weather systems will move through Northern California today into tomorrow and Saturday into Tuesday. Moderate to locally heavy rain, Gusty winds, and mountain snow will be possible at times. High temperatures across Northern California are forecast to be 10 to 20 degrees below average.

DISCUSSION.

Water vapor imagery indicates a deep tough pushing in to the Pacific Northwest this afternoon. Showers associated with this feature have started to reach the interior northern Coastal Mountain Range as of 1:45 PM this afternoon. Showers and gusty winds are forecast to continue to increase into the overnight hours. High resolution models are in good agreement a strong band of precip will move through interior northern California starting around midnight and clearing out of the Valley by the early afternoon. HREF continues to indicate high potential for hourly rainfall rates exceeding 1/2 inch/hour over several area burn scars. A Flash Flood Watch is in effect to account for the threat of debris and ash flows. After the main precip band moves out of the area, we could still see some scattered showers and possibly isolated thunderstorms with best chances mainly for the northern Sacramento Valley in the afternoon through the early evening.

After a brief lull in the stormy weather Friday night, increasing showers are expected by early saturday morning as another trough edges closer to California. This late weekend into early next week system has the dynamics of a moderate atmospheric river and ramps up by Sunday with widespread impacts anticipated. Urban and small creek flooding, gusty southerly winds and heavy rain will be widespread Sunday. Ash and debris flow will also be possible in recently burned areas. Snow level start above mountain pass levels decreasing below mountain pass levels by Sunday night and further decreasing to 5500 - 6500 feet by Monday morning. The EFI has the Sierra Nevada highlighted for expected snowfall. Significant travel impacts are likely.

EXTENDED DISCUSSION (Monday THROUGH Thursday).

Monday morning snow levels are expected to be around 5500 - 6500 feet leading to potentially hazardous mountain driving conditions with chain controls possible. Heavy snow will likely taper off throughout the day with some showers lingering into Tuesday. Several feet of snow accumulation will be possible.

By mid week, ridging from the eastern Pacific moves into NorCal. Milder temperatures and clearing skies will lead to mild weather through the remainder of the workweek. By next weekend another system may reach northern California. Stay tuned!

AVIATION.

Widespread MVFR conditions in precipitation with local IFR next 24 hours. Surface wind gusts 15-30 kts ahead of frontal passage expected from 08 - 20 utc. Isolated thunderstorms possible mainly northern Sacramento Valley terminals 18 - 02 utc.

STO WATCHES/WARNINGS/ADVISORIES. Flash Flood Watch from 11 PM PDT this evening through Friday morning for Burney Basin / Eastern Shasta County-Mountains Southwestern Shasta County to Western Colusa County-Northeast Foothills/Sacramento Valley-Northern Sacramento Valley-Shasta Lake Area / Northern Shasta County-Western Plumas County/Lassen Park.

Winter Storm Watch from Sunday evening through late Monday night for West Slope Northern Sierra Nevada-Western Plumas County/Lassen Park.




Weather Reporting Stations
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On 03/09/2021 the NDBC primary processing servers were shut off due to a facilities issue. Station pages on the NDBC website are not updating and there is no ETR at this time. We will update this banner as we learn more.
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 97 mi53 min W 2.9 67°F 1023 hPa63°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Oroville Municipal Airport, CA5 mi45 minSE 1710.00 miMostly Cloudy70°F61°F73%1018.7 hPa
Chico Municipal Airport, CA21 mi51 minSE 1810.00 miOvercast and Breezy66°F63°F88%1018.3 hPa

Link to 5 minute data for KOVE

Wind History from OVE (wind in knots)
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Last 24hrSE7E6SE60W300SE4S4S30NW3W30E6E7SE6SE3S4SE5SE14S11SE18SE17
1 day agoS10SE10SE10S6SE5E7SE5SE6SE7S9SE6S7E5E9SE11SE8E7E7E700SE7SE10SE8
2 days ago00NE4N3N3N30000S300SE300000004S11S10
G17

Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
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Thu -- 04:00 AM PDT     0.04 feet Low Tide
Thu -- 07:21 AM PDT     Sunrise
Thu -- 08:18 AM PDT     Moonset
Thu -- 08:30 AM PDT     2.34 feet High Tide
Thu -- 03:34 PM PDT     0.43 feet Low Tide
Thu -- 06:18 PM PDT     Sunset
Thu -- 07:06 PM PDT     Moonrise
Thu -- 08:04 PM PDT     2.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Thu -- 02:30 AM PDT     0.04 feet Low Tide
Thu -- 07:21 AM PDT     2.34 feet High Tide
Thu -- 07:21 AM PDT     Sunrise
Thu -- 08:18 AM PDT     Moonset
Thu -- 02:04 PM PDT     0.43 feet Low Tide
Thu -- 06:19 PM PDT     Sunset
Thu -- 06:55 PM PDT     2.86 feet High Tide
Thu -- 07:07 PM PDT     Moonrise
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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GEOS Local Image of CentralWestCoast    EDIT
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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