533
FXUS66 KSTO 112032
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
132 PM PDT Fri Jul 11 2025

For additional details on weather and expected impacts over the
next 7 days, please visit weather.gov/sto/briefing.

.DISCUSSION...

.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.

&&

.AVIATION...
VFR conditions prevail across interior NorCal next 24 hours,
although some periodic reductions to MVFR in advecting FU/HZ
possible. Winds to remain primarily light and less than 12 kts,
although southwest gusts to 20 kts in Delta and vicinity after 00z
Saturday.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Heat Advisory until 11 PM PDT Monday for Burney Basin / Eastern
Shasta County-Central Sacramento Valley-Mountains Southwestern
Shasta County to Western Colusa County-Northeast
Foothills/Sacramento Valley-Northern Sacramento Valley-Shasta
Lake Area / Northern Shasta County-Western Plumas County/Lassen
Park.

&&

$$