Area Forecast Discussion
Issued by NWS Sacramento, CA
Issued by NWS Sacramento, CA
480 FXUS66 KSTO 052117 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 117 PM PST Fri Dec 5 2025 .KEY MESSAGES... - Periods of clouds, mist, or fog continue in the Central Valley for the next few mornings - Seasonable temperatures and light winds are forecast over the next several days - Tonight - Early Sat. AM`s rain chances for Shasta County have lowered with only a 10-30% of measurable rain. && .DISCUSSION... ...Today... Current GOES-West visible satellite imagery illustrates the blanket of stratus in the Central Valley gradually eroding, with some high clouds passing overhead from the north. Visibilities have improved across the Central Valley this afternoon, but still see swaths of low clouds/stratus clouds over the Valley. We can expect another round of patchy dense fog and low clouds once again tonight into Saturday morning with best chances from Marysville southward again. Dry weather and seasonable temperatures are forecasted for the region, with 50s to 60s in the Valley and foothills, and 40s to 60s in the mountains for the daytime highs. Highs are trending several degrees cooler than initially forecasted due to the persistence of the fog/low clouds, keeping max temperatures from being fully actualized. ...Tonight-Sunday... A weak system passing to the north over the weekend may bring some isolated, light showers to the Shasta County mountains, however little to no impacts or accumulations are expected. Elsewhere, dry conditions will persist over the weekend with daily chances for fog, mist and low clouds especially in the Valley. High temperatures are forecast to be in the 40s to 60s across interior NorCal. ...Next Week... High pressure builds across the region next week, allowing for a gradual warming trend with high temperatures warming to the 50s to near 70 (mainly for areas outside of stratus/fog development). Dry conditions will continue through next week. Some ensembles are indicating a pattern change in mid December but there is a large amount of uncertainty as it is too far out in time. && .AVIATION... Lingering low cigs and mist across the Central Valley this afternoon and evening, although some sites may briefly return to VFR conditions. Another round of BF/FG and low stratus returns tonight after 03Z-12Z Saturday, with areas of MVFR/IFR conditions, locally IFR, particularly from Sacramento southward. Light and variable surface winds less than 12kts. && .STO WATCHES/WARNINGS/ADVISORIES... None. && $$