748
FXUS66 KSTO 101827
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1127 AM PDT Mon Aug 10 2026

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


.KEY MESSAGES...

 - Gradual cooling trend Tuesday onward, with near to below-normal
   temperatures late in the week.

 - Elevated Fire Weather conditions in the northern Sacramento
   Valley, Burney Basin, Sierra, and adjacent Foothills through
   today due to hot temperatures, low humidities and increased
   breezes.

 - Thunderstorm chances return on Tuesday along the Sierra Crest south
   of Highway 50, with increasing chances and coverage Wednesday
   and Thursday.

 - Elevated Fire Weather conditions due to mix wet/dry
   thunderstorm chances Wednesday and Thursday.


&&

.DISCUSSION...The upper- level ridge over the Four Corner begins
to breaks down, while a mid- to upper- level shortwave trough
develops off the West Coast. Resulting in slightly cooler
temperatures across interior NorCal today. Onshore flow is
expected to increase in response this afternoon and evening. Hot,
dry and breezy onshore winds will maintain elevated fire weather
conditions through today in the northern Sacramento Valley,
Sierra foothills, and Burney Basin.

Overnight low temperatures and maximum relative humidities will
remain elevated in the foothills through mid week, with only the
Delta and Valley receiving benefits from this increased onshore
influence.

The upper-level trough settles over the region by middle week,
bringing cooler temperatures and thunderstorm chances mid to late
week. Monsoonal thunderstorm chances return on Tuesday, with
increasing chances Wednesday and Thursday. There is a 30-60%
chance of wetting rain over the Sierra Crest south of Highway 80
on Thursday, with 15-30% chances over far northern Sierra and into
the southern Cascades. Additional, there is low chances (10%) for
thunderstorms over the Sierra foothill as well on Thursday. Elevated
fire weather is expected Wednesday and Thursday from thunderstorm
chances and dry fuel mid to late week. Stay tuned for updates!



&&
.AVIATION...


VFR conditions are expected to prevail over the next 24 hours.
Winds generally remain 12 kts or less at TAF sites. South winds
with gusts up to 15-20 kts over the northeast foothills and
surrounding areas, including RBL, from 21z Monday to 03z Tuesday
and southwest gusts up to 20-25 kts in the Delta from around 00Z
through 12Z Tuesday.
&&

.STO WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$