Monday, March8, 2021
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Marine Weather and Tides
Penn Valley, 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 6:25AMSunset 6:07PM Monday March 8, 2021 7:28 AM PST (15:28 UTC) Moonrise 3:53AMMoonset 1:17PM Illumination 25% Phase: Waning Crescent; Moon at 25 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 Penn Valley, CA
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location: 39.21, -121.2     debug


Area Discussion for - Sacramento, CA
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FXUS66 KSTO 081120 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 320 AM PST Mon Mar 8 2021

SYNOPSIS. Cool and unsettled weather through mid-week with periods of showers and thunderstorms, and mountain and upper foothill snow. Dry and milder weather expected to return by the end of the week.

DISCUSSION. Satellite imagery shows clouds increasing across the region as the initial frontal system works its way thru NorCal. Radar is picking up some very light returns over the northern mountains, likely some virga or very light precipitation. With the increase in clouds and wind, current temperatures are considerably milder (5-10 degrees in most areas) compared to 24 hours ago.

Shower chances will increase across the region by this afternoon as the next vort swinging around the base of the closed low off the PacNW coast moves in. At this point it appears the best chance for showers will be generally to the north of I-80 with a slight chance of thunderstorm across the north half of the Sacramento Valley.

More significant precipitation possible for the Central Valley and northern Sierra Tuesday and Wednesday as the closed low drops south to near the Bay Area. Pattern is classic late winter/early spring heavy snow producer for the northern Sierra with a prolonged period of southwest flow along with steep mid-level lapse rates generating significant snow despite rather meager overall moisture (TPW around 1/2 inch). Thunderstorms will also be possible each day with small hail expected to be the primary threat, though shear parameters indicate potential for some longer lived storms should sufficient instability materialize.

Winter storm watch has been posted for the far southern Cascade Range and northern Sierra for Tuesday afternoon into Wednesday evening. Several feet of snow will be possible with accumulating snow possible down into the upper foothill elevations leading to significant travel impacts.

Drier weather forecast to return Thursday as the low digs south into SoCal and western Arizona.

EXTENDED DISCUSSION (Friday THROUGH Monday). Upper ridging builds inland over interior NorCal Friday into Saturday. Dry weather expected during this period with above normal high temperatures. Ridge axis moves through early Sunday as Pacific frontal system approaches the CWA. More progressive GFS introduces some precip north of a KUKI-KRBL-KAAT line Sunday afternoon. Short wave trough moves through Sunday night with a threat of showers, mainly over the mountains and northern Sacramento Valley. Drier northwesterly flow aloft sets up over the forecast area Monday.

AVIATION. Areas of MVFR and lcl IFR poss in shwrs tda into Tue. Isold aftn tstms poss in Cntrl Vly btwn 20z-03z. Areas of Sly sfc wnd gsts to 30 kts poss in Cntrl Vly aft 18z tda. Lcl SWly sfc wnd gsts up to 35 kts poss ovr hyr mtn trrn. Sn lvls 2500 to 3500 ft with lcl LIFR conds omtns obscrg trrn at times.

STO WATCHES/WARNINGS/ADVISORIES. Winter Storm Watch from Tuesday afternoon through Wednesday afternoon for West Slope Northern Sierra Nevada-Western Plumas County/Lassen Park.

Winter Weather Advisory from 4 PM this afternoon to 4 AM PST Wednesday for Shasta Lake Area / Northern Shasta County.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SFXC1 - San Francisco Bay Reserve, CA 82 mi103 min W 6 45°F 1020 hPa38°F
PCOC1 - 9415144 - Port Chicago, CA 91 mi58 min SW 8 G 12 46°F 54°F1020.6 hPa

Wind History for Port Chicago, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Nevada County Air Park, CA10 mi33 minS 7 G 1610.00 mi36°F32°F87%1017.3 hPa
Marysville, Beale Air Force Base, CA14 mi30 minSE 1510.00 miFair44°F39°F80%1019.3 hPa
Auburn Municipal Airport, CA19 mi33 minSSE 10 G 179.00 miOvercast41°F37°F87%1019.3 hPa
Marysville, Yuba County Airport, CA21 mi35 minSSE 1510.00 miFair45°F37°F74%1019.4 hPa
Lincoln Regional Karl Harder Field, CA22 mi33 minSSE 13 G 1710.00 miPartly Cloudy45°F37°F76%1019.6 hPa

Link to 5 minute data for KGOO

Wind History from GOO (wind in knots)
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1 day agoSE6434CalmW6CalmCalm5
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Tide / Current Tables for Sacramento #4, Sacramento River, California
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Sacramento #4
Click for Map
Mon -- 03:51 AM PST     Moonrise
Mon -- 03:52 AM PST     2.39 feet High Tide
Mon -- 06:27 AM PST     Sunrise
Mon -- 10:15 AM PST     0.90 feet Low Tide
Mon -- 01:20 PM PST     Moonset
Mon -- 02:42 PM PST     2.94 feet High Tide
Mon -- 06:06 PM PST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.81.62.22.42.21.91.61.310.911.62.42.82.92.82.52.11.71.20.80.40.1

Tide / Current Tables for Clarksburg #4, Sacramento River, California
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Clarksburg #4
Click for Map
Mon -- 02:43 AM PST     2.39 feet High Tide
Mon -- 03:51 AM PST     Moonrise
Mon -- 06:27 AM PST     Sunrise
Mon -- 08:45 AM PST     0.90 feet Low Tide
Mon -- 01:21 PM PST     Moonset
Mon -- 01:33 PM PST     2.94 feet High Tide
Mon -- 06:06 PM PST     Sunset
Mon -- 10:30 PM PST     -0.07 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.82.32.42.21.81.51.210.91.21.92.52.92.92.82.421.51.10.60.2-0-0

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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