208
FXUS66 KSTO 161858
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1158 AM PDT Tue Jun 16 2026

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


.KEY MESSAGES...

 - Hot, well-above average temperatures today with widespread
   Moderate HeatRisk and areas of Major HeatRisk in the
   northern/central Sac Valley.

 - Cooling trend begins Wednesday; near to below normal
   temperatures through the weekend.

 - Chances for mountain showers/thunderstorms along the Sierra
   crest on Thursday into Friday.

&&

.DISCUSSION...
While the hottest temperatures of the week have passed, we`re
still expecting hot and well above normal temperatures to continue
today, along with widespread Moderate HeatRisk and limited areas
of Major HeatRisk. Valley temperatures in the majority of the
Sacramento Valley will be in the high 90s to low 100s, highest in
the northern Sacramento Valley. An Extreme Heat Warning remains in
effect for the northern Sacramento Valley, adjacent terrain, and
Butte County through 11pm this evening. The Sacramento area and
Delta will remain cooler than the rest of the Valley, though still
are expecting highs up to the low 90s today.

On Wednesday, a gradual cooling trend begins as upper level
ridging begins to break down. Near to below normal high
temperatures are expected through the weekend. While we`re not
expecting widespread precipitation with this pattern change, there
is an increasing chance (15-25%) for isolated showers and
thunderstorms along the Sierra crest on Thursday and into Friday.

Over the weekend, near to below normal temperatures are expected
following the passage of an upper level trough. Warmer
temperatures return early next week.

&&

.AVIATION...
VFR conditions with clear skies over the next 24 hours. In the
vicinity Delta, Westerly gusts up to 25-30 kts are possible
through 18Z Wednesday. In the southern Sacramento Valley, west to
southwest gusts 15 to 20 kts are possible between 00Z-06Z
Wednesday. Sustained winds 12 kts or less elsewhere.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Extreme Heat Warning until 11 PM PDT this evening for Butte
County Below 1000 ft-N. Sac Valley in Tehama County-Shasta
County Foothills 1000-3000 ft-Shasta Lake Area & 1-5 1000-3000
ft-Shasta Metro-Sierra (Tehama-Plumas) 1000-3000 ft-Tehama Co
Coast Range Above 3000 ft-W Tehama Co Foothills 1000-3000 ft-W.
Shasta County 1000-3000 ft-W. Shasta County Above 3000 ft.

&&

$$