Thornton, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

250
FXUS66 KSTO 212022
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
122 PM PDT Mon Apr 21 2025

.Discussion...

.Synopsis...
Dry and mild weather continues into tomorrow with Minor HeatRisk
expected. Unsettled weather develops midweek with chances for
precipitation, isolated thunderstorms, and breezy winds in the
afternoon and evening hours into the weekend.

&&

.Key Messages...

* Today-Wednesday: Periodically breezy winds alongside above
  normal temperatures and areas of Minor HeatRisk.

-Probability of high temperatures 80 degrees F or higher: 75-100%
    (Today- Tuesday) and 30-60% (Wednesday).

-Breezy north winds today and Tuesday, shifting toward south to
     west onshore flow by midweek. Winds gusting 15-25 mph at times.

-5-15% chance of isolated showers or thunderstorms Wednesday PM
     across northern Sacramento Valley and surrounding terrain.

* Late Week-Next Weekend:

-Cooling trend with periodically breezy to gusty onshore winds.

-Isolated to scattered showers and thunderstorms (10-20%)
     possible, primarily from Interstate 80 northward.

-High elevation snow showers possible late Friday & Saturday, with
     a 30-45% probability of 1 inch of snowfall above 5500 feet
     along Sierra/southern Cascades.

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

.Changes from previous forecast...

* Isolated thunderstorm potential increasing for Wednesday PM -
  Saturday PM.

* High elevation snowfall potential trending upward late week into
  the weekend.

&&

.AVIATION...

VFR conditions across interior NorCal next 24 hours. Northerly
winds expected, with gusts to 15 to 20 kts for the northern
Sacramento Valley through 00Z, becoming light overnight.

&&

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

&&

$$