Area Forecast Discussion
Issued by NWS Sacramento, CA
Issued by NWS Sacramento, CA
738 FXUS66 KSTO 011941 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 1141 AM PST Mon Dec 1 2025 .KEY MESSAGES... - Periods of clouds, mist, or fog continue in the Central Valley for the next few mornings. - Breezy north to east winds Wednesday into Thursday, strongest in the Valley and Delta. - Weak system brushes by the area this weekend, bringing the chance for showers, mainly across Shasta County. Dry weather continues elsewhere for the foreseeable future. && .DISCUSSION... ...Tonight - Tuesday... Morning fog and stratus have begin to break up early this afternoon (finally!), more so than we`ve seen the past few days. Latest hi-res guidance attempts to clear out the entire Sac and northern San Joaquin valleys by this evening before sunset. The set-up for tonight will be a battle between how much we clear out over the next several hours and an incoming cloud shield from inside-slider system over the the Great Basin that will drop south across the area tonight. There may be enough clearing across the southern Sac Valley and northern San Joaquin before the clouds arrive to allow for the development of fog again by Tuesday morning. Certainly will be something to watch in the near-term. ...Wednesday - Friday... Aforementioned inside-slider will skirt southeast of the state on Wednesday and into the Four Corners region by Wednesday night into Thursday. Tightened gradient will allow for breezy north to northeast winds across the area during the period. Winds will be strongest in the typical spots with a northerly pattern: across the western side of the Sac Valley and into the Delta (gusts 20-35 mph), and over the Sierra crest (up to 45 mph). Not expecting too much in the way of impacts with the wind but it should be enough to scour out persistent Valley stratus and fog. Ridging then rebuilds over the area for the end of the work week with near- normal temperatures. ...Saturday - Sunday... A weak shortwave will move across the Pacific Northwest this weekend leading to more zonal flow across the area. Also brings about the potential for light showers, mainly across Shasta County and northern Sierra but ensembles aren`t too excited about much in the way of accumulation or any impacts. Elsewhere dry weather will continue. The next hint at a potential pattern change comes by the following weekend but we`ll see how that develops over the next week or so. && .AVIATION... Gradually improving ceilings across the Central Valley this afternoon and evening, should improve back to VFR. Depending on degree of clearing, will likely see another round of BF/FG and low stratus for most sites returning tonight after 08-12Z. Potential for period of IFR/LIFR cigs, especially from Sacramento southward. Generally light and variable surface winds less than 10 kts for TAF sites thru Tuesday afternoon. && .STO WATCHES/WARNINGS/ADVISORIES... None. && $$