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Northern CA Forecast Discussion
FXUS66 KSTO 062118 AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
218 PM PDT Fri Jun 6 2025

SYNOPSIS...
Warm-up expected through the weekend with Moderate HeatRisk. Triple digit temperatures and areas of Major HeatRisk expected in parts of the northern Sacramento Valley Sunday-Monday. Periodically breezy winds continuing into next week. Daily afternoon/evening mountain thunderstorm chances (10-30%) will continue today and Saturday over the High Sierra south of Highway 50. Thunderstorm chances expand northward into Sunday into Monday. Minor cooling expected by mid-week.


.KEY MESSAGES... * Today-Tuesday: -Warming trend into early next week with Moderate HeatRisk.

Areas of areas of Major HeatRisk across the northern Sacramento Valley Sunday-Monday. -Periodically breezy onshore flow in the Delta and vicinity during the afternoons and evenings. --Probability of Valley High Temperatures > 95F: ---Northern/Central Sacramento Valley: 75-100% ---Delta, S. Sacramento Valley, N. San Joaquin Valley: 20-50% --Probability of Valley High Temperatures > 100F: ---Northern/Central Sacramento Valley: 40-90%, Saturday-Monday (highest chances on Sunday-Monday) -Chances for isolated afternoon/early evening mountain showers and thunderstorms: --Today-Saturday: 15-30%, south of US 50 along the Sierra Crest --Sunday-Monday: 10-30%, over the northern Coastal Range, southern Cascades and the Sierra --Tuesday: 10-20% across Shasta County mountains * Wednesday-Thursday: -Minor cooling trend along with areas of Moderate HeatRisk persist across portions of the northern/central Sacramento Valley. -Periods of breezy winds, mainly in the afternoons and evenings. .Changes from previous forecast... -

Areas of Major HeatRisk in the northern Sacramento Valley are expected through Monday. -Mountain thunderstorm chances may linger through Tuesday afternoon in Shasta County.






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