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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