453
FXUS66 KSTO 171821
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1121 AM PDT Mon Aug 17 2026

.KEY MESSAGES...

  - Seasonal temperatures and dry conditions continue through the
    week ahead.

&&

.DISCUSSION...

Morning mid-level stratus intrusions across portions of the
Sacramento Valley has helped keep temperatures cool to start the
work week. Stratus will continue to burn away as we move through
the remainder of the early afternoon hours, allowing high
temperatures to climb into the low to upper 90s for the Valley;
warmest temperatures in the northern Sacramento Valley. Synoptic
analysis reveals high pressure aloft in south CONUS with offshore
troughing in the Pacific. This pattern will continue to allow
seasonable high temperatures across NorCal, along with onshore
flow easing overnight and early morning temperatures. Ridge in the
south is forecast to retrograde, drifting slightly west allowing
for moderation in high temperatures Tuesday and Wednesday, but
only by 3 to 6 degrees with Minor HeatRisk.

Thursday, Pacific low is forecast to dig closer to shore while the
upper level ridge moves into the Four Corners region. Onshore flow
will slightly increase, along with slight lowering of high
temperatures. Shortwave trough will eject from Pacific parent low
Friday, moving across the PacNW. While early ensemble runs keep
shortwave energy fairly dry, we could see a period of breezy west
winds across the Burney Basin on Friday. While humidity values are
expected to be in the mid to upper 20s during that time, will need
to monitor humidity trends for any elevated fire weather concerns,
but at this time no immediate concerns are present.

&&

.AVIATION...

VFR conditions to prevail across interior NorCal next 24 hours.
Surface winds below 15 kts, except in Delta vicinity later around
01z through 17z Tuesday where surface gusts up to 25 kts possible.
Northern Sacramento Valley surface wind gusts from the south up
to 20 kts through 03z Tuesday. Terrain driven winds in mountains
with gusts up to 20 kts.

&&

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

$$