Area Forecast Discussion
Issued by NWS Sacramento, CA
Issued by NWS Sacramento, CA
113 FXUS66 KSTO 112039 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 139 PM PDT Sun May 11 2025 For additional details on weather and expected impacts over the next 7 days, please visit weather.gov/sto/briefing. .Discussion... .Synopsis... Gusty southerly winds and low relative humidity bring elevated fire weather conditions across the Sacramento Valley today. A weather system will bring chances for light showers, mountain snow showers and isolated thunderstorms Monday through Tuesday. Drier weather will follow with seasonable temperatures and occasionally breezy winds. && .Key Messages... * Today: -Gusty southerly winds develop today ahead of an approaching weather system -Wind Advisory is in effect through 1 AM Monday for the northeast foothills and the northern/central Sacramento Valley, strongest winds along and east of I-5 mainly from Chico northward with gusts of 40 to 50 mph -Elevated fire weather conditions today as gusty southerly winds and low relative humidity overlap in the Sacramento Valley * Monday - Tuesday: -Light showers and mountain snow showers expected as the weather system moves through -50-80% probability of rain > 0.25" mainly across northern Sacramento Valley, northern Sierra north of Hwy 50, and adjacent foothills -15-30% probability of isolated thunderstorms Monday and Tuesday, highest across north/central Sacramento Valley, foothills and mountains -20-50% probability of 2" snow along the Sierra above 5500 feet, 70-90% probability in the southern Cascades/Lassen Peak * Mid to Late Week: -Dry weather, seasonable temperatures and occasionally breezy winds .Changes from previous forecast... -Potential for elevated fire weather conditions in the Valley from increased north to east flow late next weekend && .AVIATION... VFR conditions across all TAF sites next 24 hours. Gusty southerly winds 15-25 kts in the lower elevations with gusts 20-40 kts, and 30-50 kts gusts over the Sierra out of the southwest until 08z Monday, and again after 12z Monday with gusts up to 25-30 kts in the Valley and up to 30-40 kts over the mountains. There is a 10-30% chance of isolated thunderstorms across the northern Sacramento Valley, foothills, and mountains from 18z Monday - 03z Tuesday, with brief periods of MVFR conditions. Gusty and erratic winds near thunderstorms. && .STO WATCHES/WARNINGS/ADVISORIES... Wind Advisory until 1 AM PDT Monday for Central Sacramento Valley-Northeast Foothills/Sacramento Valley-Northern Sacramento Valley. && $$