Area Forecast Discussion
Issued by NWS Sacramento, CA
Issued by NWS Sacramento, CA
089 FXUS66 KSTO 052033 AFDSTO Area Forecast Discussion National Weather Service Sacramento CA 133 PM PDT Thu Jun 5 2025 .DISCUSSION... .SYNOPSIS... Warm and dry weather continues today, with a warm-up expected over the weekend, with likely triple digit temperatures and Major HeatRisk in parts of the northern Sacramento Valley. Periodically breezy winds continuing into next week. Daily afternoon/evening mountain thunderstorm chances (10-15%) will continue today and through the weekend over the High Sierra. && .KEY MESSAGES... * Today-Tuesday: -Slightly cooler temperatures today, before high temperatures follow a warming trend Friday and into early next week with Moderate HeatRisk and some areas of Major HeatRisk --Probability of Valley High Temperatures > 95F: ---Northern/Central Sacramento Valley: 75-100% ---Delta, S. Sacramento Valley, N. San Joaquin Valley: 40-80% --Probability of Valley High Temperatures > 100F: ---Northern/Central Sacramento Valley: 40-70%, Saturday-Monday -Chances for isolated afternoon/early evening mountain showers and thunderstorms: --Today-Saturday: 15-25%, South of US 50 along the Sierra Crest. --Sunday-Monday: 10-20%, Along the Sierra Crest .CHANGES FROM PREVIOUS FORECAST... -Probability for temperatures over 100F have increased slightly in the northern Sacramento Valley && .AVIATION... VFR conditions prevail over interior NorCal next 24 hours. Surface winds generally below 12 kts, except in the vicinity of the Delta where surface winds could get up to 25 kts between 22Z Thursday and 06Z Friday. Additionally, there is a 15-25% chance of isolated showers or thunderstorms over the Sierra south of US 50 until and 03Z Friday. && .STO WATCHES/WARNINGS/ADVISORIES... None. && $$