232
FXUS66 KSTO 172013
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
113 PM PDT Thu Jul 17 2025

.DISCUSSION...

.SYNOPSIS...
Continued dry and seasonable conditions through the end of the
work week. Slight warmup over the weekend, then high temperatures
will cool back down to below normal through at least the middle of next
week. Breezy onshore flow will continue into next week.

&&

.KEY MESSAGES...

*  Today:

 - High temperatures continue to be slightly below normal, with
   highs running around 2 to 4 degrees below what is expected for
   this time of year.
 - Smoke from the Green Fire will continue to create hazy/smoky
   skies in vicinity of the fire. Diurnal winds, with northerly
   winds in the overnight hours and southerly winds in the daytime
   should help clear out smoke in Valley areas such as Redding by
   mid-day. Smoke/haze will return overnight from wind shift.
 - Onshore flow and Delta Breeze influence expected through at
   least early next week, bringing minor cooling and overnight
   relief to the Delta and adjacent Valley.
- Breezy to gusty southerly winds expected this evening,
      especially in the vicinity of the Delta.
- Probability of gusts 30 mph or greater this evening:
- 60 to 90% in the Delta and vicinity

*  Thursday-Next Wednesday:

 - Upper level pattern remains largely persistent with broad
   troughing/northwesterly flow across interior NorCal.
 - Near seasonable temperatures continue, increasing slightly over
   the weekend, before cooling again early next week. The cooldown
   next week could see temperatures 10 degrees below July normals
   for interior NorCal.
 - Periodically breezy onshore flow expected to persist in the
   afternoon and evening late this week, shifting toward terrain
   driven influence during the overnight hours.
 - Persistent and periodic late day wind gusts 20 to 30 mph
   anticipated throughout the Delta and vicinity each day.

.Changes from previous forecast...
 - Minimal changes from the previous forecast.

&&

.AVIATION...
VFR conditions expected next 24 hours across interior NorCal.
Periodically breezy west-southwest winds to continue as well, with
strongest gusts 20-25 kts through the Delta and vicinity after
22z, gradually decreasing after 06z.

&&

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

$$