205
FXUS66 KSTO 201845
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1145 AM PDT Sat Jun 20 2026

For additional details on weather and expected impacts over the
next 7 days, please visit weather.gov/sto/briefing.

.KEY MESSAGES...

 - Continued elevated fire weather concerns over Shasta County
   from thunderstorms with possible new fire starts from lightning
   until this evening.

 - Warming trend today into next week with minor to moderate
   HeatRisk.

&&

.DISCUSSION...

Conditions have quieted since yesterday with fairly clear skies
across the Valley outside of lingering cloud cover the Coast
Range and western Shasta County as of mid-Saturday morning. We can
expect another round of isolated thunderstorms but more confined
to northern Shasta County (15-25% chance) and across the higher
surrounding terrain and tracking eastward. Best chances for
development will be from 1 PM to 7 PM with possible new fire
starts from lightning, brief heavy rains, small hail, and gusty
outflow winds all possible from any formed thunderstorms.

Afterwards, a warming and drying trend dominates the forecast
heading into next week as ridging builds over the Pacific NW. By
early next week we return to Valley highs in the 90s to low 100s
with Min RH`s in the upper teens to 20s outside the immediate
Delta region. Minor HeatRisk continues throughout Sunday before
transitioning to patchy Moderate HeatRisk in the Valley early
next week. We will continue to monitor fire weather conditions and
watch for any changes as we continue throughout the week.

Lastly, we will see a daily Delta Breeze with gusts up to 20-30
MPH each day, strongest in the afternoons. Please continue to
monitor the forecast and have multiple ways to receive
notifications.

&&

.AVIATION...

VFR conditions are expected to continue through the TAF period.
Isolated showers or thunderstorms around RDD from around 22z to
03z Sunday. Otherwise, areas are seeing SKC to FEW cloud
coverage. Winds from the Delta will increase for the Sacramento
sites this evening and into the early overnight, with gusts up to
20-25kts. Winds overnight go light and variable for the sites.

&&

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

&&

$$