Challenge, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

541
FXUS66 KSTO 022005
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
105 PM PDT Wed Jul 2 2025


.DISCUSSION...

.SYNOPSIS...
20-30% chance for mountain thunderstorms through early this
evening. Lightning on dry fuels may lead to easier fire starts.
Onshore flow developing late week and will bring cooler and
quieter conditions with locally breezy winds. Slow warming trend
over the weekend into next week.

&&

.KEY MESSAGES...

* Wednesday:
 - Slight (10-30%) probability of thunderstorms through early
   Wednesday evening across the mountains of interior NorCal
 - Highest thunderstorm probabilities over the Sierra crest
 - Lightning on dry fuels may lead to easier fire starts
 - Continued warm with above normal temperatures and moderate
   HeatRisk

* Late Next Week and Weekend:
 - Quiet weather late week into the weekended
 - Onshore winds will cool temperatures to seasonal norms to
   slightly below average
 - Coolest day will be Friday
 - Winds will be locally breezy at times Thursday and Friday,
   strongest through the Delta and over the higher elevations
 - Slow warming over the weekend into early next week, continued
   dry

.Changes from previous forecast...
 - Added the mention of locally breezy onshore winds mainly
   through the Delta and over the higher elevations


&&

.AVIATION...


Mainly VFR conditions over interior NorCal next 24 hours. Brief
potential for MVFR/IFR in isolated showers and t-storms in the
northern Sacramento Valley and mountains through around 06z
Thursday. Surface winds generally below 15 knots, with gusts up to
20 knots in any t-storm that develops. Breezy onshore flow in
Delta vicinity with gusts up to 25 knots possible.
&&

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

$$