FXUS66 KSTO 112032
AFDSTO
Area Forecast Discussion
National Weather Service Sacramento CA
132 PM PDT Fri Jul 11 2025
SYNOPSIS...
Hot weather is expected through Monday with Moderate to locally
Major HeatRisk. Increasing Delta breeze influence will bring minor
cooling and overnight relief over the weekend and into next week
in the Delta and adjacent Valley locations. Dry weather and
periodically breezy onshore winds are expected through Friday.
.KEY MESSAGES...
* Today-Monday:
- Heat Advisory remains in effect through 11 PM Monday evening
for the northern/central Sacramento Valley and surrounding
foothills and mountain locations.
- Broad troughing and attendant northwesterly flow gradually
build in, although high heights aloft persist.
- Widespread Moderate HeatRisk with areas of Major HeatRisk across
interior NorCal.
- Smoke will continue to impact areas in the vicinity of the
Green Fire, with occasional northerly winds spreading smoke and
haze southward through the Valley.
- Locally breezy northerly flow in the northern/central
Sacramento Valley and adjacent terrain, mainly in the overnight
through morning timeframe
- Low daytime relative humidity with moderate to poor overnight
recoveries over foothills and mountains
- Increasing onshore flow and Delta Breeze influence expected
into the weekend, bringing minor cooling and overnight relief
to the Delta and adjacent Valley.
* Tuesday-Thursday:
- Upper level pattern remains largely persistent with broad
troughing/northwesterly flow across interior NorCal.
- Lowering heights aloft introduce a slight cool down to more
seasonable temperatures mid to late next week.
- Periodically breezy onshore flow expected to persist, with
shifting toward terrain driven influence during the overnight
hours.
.Changes from previous forecast...
- Low (5-10%) chance for isolated mountain thunderstorms across
northern Shasta County on Sunday/Monday in the
afternoon/evening.
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