712
FXUS66 KSTO 252008
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
108 PM PDT Wed Jun 25 2025

.DISCUSSION...

.SYNOPSIS...
Seasonable temperatures accompanied by dry weather and
periodically breezy onshore winds through the remainder of the
week. A warming trend to widespread Moderate HeatRisk is then
anticipated over the the weekend into next week. Isolated mountain
thunderstorms return this weekend into early next week.

&&

.KEY MESSAGES...

* Through Friday:

 -Near to slightly above normal temperatures expected, with Delta,
  Valley, and foothills high temperatures in the 80s to 90s and
  70s to 80s in the mountains
 -Minor HeatRisk expected through Thursday with some areas of
  Moderate HeatRisk on Friday

* This Weekend - Early Next Week:

 -Warming trend into the weekend with high temperatures across the
  Delta, Valley, and foothills in the 90s to lower triple digits
  and 80s to low 90s expected at higher elevations.
 -Widespread Moderate HeatRisk returns to interior NorCal by
  Saturday and persists into next week
 -Probability of Valley high temperatures > 100F:
  Northern/Portions of the Central Sacramento Valley: 65-95%;
  Delta, S. Sac Valley, N. San Joaquin Valley: 10-30%
 -Slight (10-20%) chance of isolated thunderstorms this weekend
  through early next week during the afternoon and early evening
  hours across the mountains of interior NorCal. Highest chances
  early next week.

.Changes from previous forecast...
 -Slight increase in thunderstorm potential early to mid next
  week.

&&

.AVIATION...
VFR conditions prevail across NorCal next 24 hours. Surface winds
generally under 15 knots, except in the northern Sacramento
Valley where surface gusts up to 20 knots possible from around 21z
today through 06z tomorrow. Small chance of marine layer
intrusion in the Delta with lower ceilings around 1000 feet or
less possible around 09 to 14z.

&&

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

&&

$$