147
FXUS66 KSTO 151933
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1233 PM PDT Tue Jul 15 2025

.DISCUSSION...

.SYNOPSIS...
Normal to near normal temperatures the remainder of this week due
to onshore flow, along with dry conditions and periodically breezy
onshore winds. Gradual warm-up over the weekend before another
slight cool down early next week.

&&

.KEY MESSAGES...

*  Today-Wednesday:

 - Temperatures begin a cooling trend today and Wednesday to near
   normal temperatures, with below normal temperatures expected
   Wednesday in areas adjacent to the Delta.
 - Smoke will continue to impact areas in the vicinity of the
   Green Fire, though more southerly winds this evening and on
   Wednesday should keep most smoke out of the Valley during the
   day.
 - Locally breezy northerly flow in the northern/central
   Sacramento Valley and adjacent terrain which may allow smoke
   from the Green Fire into the Valley, mainly in the overnight
   through morning timeframe.
 - Onshore flow and Delta Breeze influence expected through the
   weekend, 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:
- 20 to 50% in the central and northern Sacramento Valley
- 60 to 95% in the Delta and vicinity
 - Humidities improve slightly throughout this week, especially
   closer to the Delta. Daytime humidities and overnight
   humidities decrease again Friday and into the weekend.

*  Thursday-Monday:

 - Upper level pattern remains largely persistent with broad
   troughing/northwesterly flow across interior NorCal.
 - Near seasonable temperatures continue late in the week,
   increasing slightly over the weekend, before cooling again
   early next week.
 - 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...
Wildfire smoke may result in periodic MVFR and IFR conditions in
the northern Sacramento Valley today. VFR conditions expected
elsewhere across interior Northern California over the next 24
hours. West-southwest winds will be breezy through the Delta with
gusts 20 to 30 kts through 18Z Wednesday. Elsewhere, sustained
speeds generally around 12 knots with periodic gusts 15 to 20 kts
in the Valley until around 06Z Wednesday.

&&

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

&&

$$