Marine Weather and Tide Forecast for Terminous, CA

FXUS66 KSTO 102127 AFDSTO

Area Forecast Discussion National Weather Service Sacramento CA 127 PM PST Mon Nov 10 2025

For additional details on weather and expected impacts over the next 7 days, please visit weather.gov/sto/briefing.

KEY MESSAGES

- Dry and warm weather continues through Tuesday - An atmospheric river storm system late Wednesday through Friday will bring widespread precipitation, gusty winds, cooler temperatures, and mountain snow - Winter Storm Watch in effect from 1 AM Thursday - 4 AM Friday for the northern Sierra and southern Cascades above 5000 feet - Potential for some additional showers over the weekend into early next week as a secondary system moves across the Pacific Northwest

DISCUSSION

Today through Tuesday
Warm and dry conditions will prevail across interior northern California through Tuesday as upper level ridging continues across much of the Western US. High temperatures will range from the upper 60s to lower 70s in the mountains to the upper 70s to around 80 in the Valley, which is trending around 10 to 12 degrees warmer than the climatological average for the middle of November.
Lowest humidity values will be in the Sierra Nevada south of Interstate 80, around 20 to 30 percent range during the daytime.
High resolution guidance continues to show patchy fog/mist developing Tuesday morning before sunrise and lasting through mid morning. Confidence remains low on exact location and how dense the fog becomes. Right now, best chances are in the southern Sacramento Valley and the northern San Joaquin Valley Tuesday morning.

Wednesday through Friday
Ensembles are in good agreement on the ridge shifting eastward mid to late week, with a deepening trough in the eastern Pacific.
An atmospheric river storm system will approach the region bringing along widespread precipitation, mountain snow, scattered thunderstorms and gusty southerly winds beginning late Wednesday afternoon. Cooler temperatures will also accompany this system Wednesday through the end of the work week. Storm total precipitation amounts have trended slightly higher with now 1-1.5 inches forecast across the Valley and 1 to 3.5 inches forecast in the foothills and mountains from late Wednesday through Friday.
Slick roads and ponding water may lead to increased travel times.

While there is still some uncertainty in exact timing, snow levels, and snow amounts, the most likely amounts of 4 to 8 inches above 5000 feet and 1 to 2 feet above pass level warrant a Winter Storm Watch over the northern Sierra Nevada and southern Cascades from 1 AM Thursday through 4 AM Friday. Snow levels will initially be above 8,000 feet on Wednesday before lowering to 5,000-6,000 feet Thursday and potentially down to 4,000-5,000 feet early Friday. Chain controls, travel delays and slick/snow covered roads will be possible above 5000 feet from heavy snow.
There is also a 10-20% chance of thunderstorms late Wednesday through Thursday, including the overnight period as the initial band moves through NorCal. Showers linger on Friday but rain and snow accumulations are much lighter by that point. Be sure to plan ahead for the pattern change and check back frequently for updates on the latest forecast!

Saturday through Monday
There is potential for another round of showers in the forecast for later this weekend into early next week from a secondary system moving across the Pacific Northwest. Minimal impacts are expected from this at this time as precipitation amounts appear to be relatively light, however there could be some minor snow accumulations in the mountains and then slick roads elsewhere from rain.

AVIATION
General VFR conditions prevail across interior northern California over the next 24 hours, with the exception of patchy MVFR/IFR/LIFR conditions in the Valley and Delta from 11Z to 17Z Tuesday in BF/FG. Confidence is low on exact timing and density.
Light and variable winds are forecast through the period.
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