871
FXUS66 KSTO 040346
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
846 PM PDT Tue Jun 3 2025

.Discussion...

.Synopsis...
Elevated fire weather conditions return Wednesday with breezy
northerly winds and low humidity. Breezy onshore winds will bring
some nighttime cooling into the Delta and adjacent areas. There
is a 10-20% chance of isolated mountain shower/thunderstorms each
afternoon from Wednesday through Sunday along the Sierra crest
mainly south of Highway 50, but no significant impacts are
expected at this time. Temperatures trend higher this weekend.

&&

.Key Messages...

* Today - Friday:
  -Elevated fire weather conditions on Wednesday with breezy northerly
   winds and low humidity
  -50-80% probability of wind gusts > 30 mph, highest in the
   northern and central Sacramento Valley and adjacent foothills
  -Low relative humidity with limited overnight recovery expected
   as breezy north winds increase this evening

 -Moderate HeatRisk in the Valley and lower foothills each day
  -60-90% probability of highs > 95 degrees in the
   northern/central Sacramento Valley
  -20-40% probability of highs > 95 degrees in the southern
   Sacramento Valley, Delta and northern San Joaquin Valley

 -10-20% probability of thunderstorms Wednesday, Thursday and
  Friday afternoons along the Sierra crest south of Highway 50

* Saturday - Monday:
 -Widespread Moderate HeatRisk with localized Major HeatRisk
  -80-95% probability of highs > 95 degrees in the
   northern/central Sacramento Valley
  -30-50% probability of highs > 95 degrees in the southern
   Sacramento Valley, Delta and northern San Joaquin Valley

 -10-20% probability of thunderstorms Saturday and Sunday
  afternoons in the mountains, best chances south of Highway 50

&&

.AVIATION...
VFR conditions prevail over interior NorCal next 24 hours.
Northerly surface winds around 10-15 kts, with gusts 20-30 kts
over the Northern and Central Sacramento Valley with west to
southwest winds in the Delta vicinity.

&&

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

&&

$$