315 FXUS66 KSTO 042020 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 120 PM PDT Fri Apr 4 2025 .Discussion... .Synopsis... Warm and mild weather expected through weekend`s end with light north winds at times. A weak system will bring light precipitation to interior Northern California late Sunday into Monday, mainly over the foothills and mountains north of I-80. .Key Messages... * Drier and warmer weather through the weekend. * Chances for Valley Highs > 75 Degrees: 50-90% across Northern and Central Sacramento Valley on Saturday, with 30-50% across the southern Sacramento and northern San Joaquin valleys. 60-100% chance across the Valley on Sunday. * Sunday PM - Monday: A weak system will bring clouds and light precipitation to areas north of I-80, especially over the foothills and mountains. 24-Hour Probability of precipitation amounts > 0.25" (Sunday- Monday): 30-70% across the mountains, foothills, and northern Sacramento Valley. * Slight chance of thunderstorms (10-15%) in the northern Sacramento Valley and adjacent foothills Monday afternoon and evening. * Mild and dry conditions Tuesday into late next week. .Changes from previous forecast... * Precipitation amounts decreased slightly for Sunday PM-Monday. * Isolated thunderstorm chances (10-15%) on Monday. && .AVIATION... VFR conditions prevail over interior NorCal for next 24 hours. Sustained surface winds 12 knots or less. Northerly gusts of 20 knots possible through 03z Saturday. && .STO WATCHES/WARNINGS/ADVISORIES... None. && $$