757
FXUS66 KSTO 201953
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1253 PM PDT Thu Aug 20 2026


.KEY MESSAGES...

  - Elevated Fire Weather Conditions Friday through Saturday within
    the Burney Basin due to low RH and breezy westerly winds.

  - Dry and with seasonable high temperatures through the
    weekend.

&&

.DISCUSSION...

Current satellite shows the mostly sunny skies across the area,
with areas of scattered cloud coverage across the northern parts
of the state. Temperatures are in the upper 70s to 80s, with highs
in the upper 80s to 90s expected this afternoon/evening. Breezy
onshore winds this evening will help cool off temperatures after
sunset for the southern Sacramento Valley, Delta, and northern
San Joaquin Valley.

A weak upper level trough moves across northern CA into Oregon
today through Saturday bringing higher level clouds to our area
and the slight chance for isolated thunderstorms to parts of
Trinity/Shasta region. These chances are low (less than 5 percent)
for Shasta county as lift, moisture, and instability are higher
toward the northern Coastal Range into southern Oregon. However,
as the system moves across northern California there will be
increased wind in the Burney Basin. EFI signals have hinted at
higher than normal chances for stronger wind (gusts up to 30mph).
This on top of the low RH values in the upper teens to 20s bring
elevated fire weather conditions. The strongest of the winds will
be on Friday, with trailing in intensity through parts of
Saturday. We continued the headline for Elevated Fire Weather
Concerns for the Burney Basin Friday and again on Saturday. The
system translates out of the region late Saturday, with a return
to sunny and seasonable conditions Sunday into next week.

Temperatures will fluctuate through the week around seasonable
highs, with a slight cooling trend over the weekend and into next
week. Winds will continue to be breezy at times in the Delta
in the evening/overnight hours.

&&

.AVIATION...

VFR conditions prevail through the TAF period, with FEW to SCT
clouds moving through the Sacramento sites, RBL, and RDD. Breezy
onshore winds this evening, with gusts up to 20kts in the Delta.
Elsewhere in the Valley surface winds will be around 5-10kts
sustained, with the occasional gust to 15kts this
afternoon/evening.

&&

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

&&

$$