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.



&&



$$