425
FXUS66 KSTO 011715
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1015 AM PDT Mon Jun 1 2026

.KEY MESSAGES...

 -Dry and warming weather this week, with areas of Moderate
  HeatRisk, low humidity and periodically breezy winds especially
  late Wednesday into Thursday.

 -Delta breezes starting Tuesday continuing through the week.

&&

.DISCUSSION...

...Tuesday...
Very little changes in the forecast package today. Ensemble output
remains very similar so confidence if above normal.  An upper
level low in the Pacific Northwest will be the main weather impact
through the next 7 days. A short wave ridge ahead of this upper
low will be in place over the area Tuesday. This will keep
temperatures a bit above normal in the mid 90s.

...Wednesday through Friday...
A wave of energy will rotate around the PacNW low Wednesday and
move across NorCal. This will increase pressure gradient a bit for
some gusty winds at times, but humidities look to not get too low
and have trended up a bit from yesterday. Thursday this wave
pushes off to the east as PacNW low remains and we shift into
another short wave ridge pattern for another warm day. Humidities
on Thursday will be lowest in the far northern Sac Valley in the
teens but winds shouldn`t be too bad so conditions remain below
Red Flag Warning criteria. Friday...PacNW upper low begins to
slide south reducing heights over the area and increasing westerly
flow for some delta flows.

...Saturday into early next week...
The upper low slides across the area bringing a cooler day and
breezy conditions but dry weather. Eventually Sunday into Monday
the upper trough moves off to the east and decreases in strength.
There may be a period of north winds in this area but right now
Ensemble output suggesting the energy will not dig south and we
rather end up with a weaker westerly flow for low impactful
weather. WMR
WMR

&&

.AVIATION...
VFR conditions at TAF sites over the next 24 hours. Surface winds
generally at or below 12 kts, except in the Delta vicinity with
west-southwest winds 10 to 15 kts with gusts to 20 kts from 23Z
Monday through 12Z Tuesday, and then up to 25 kts after 22Z
Tuesday.

&&

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

&&

$$