037
FXUS66 KSTO 201950
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
Issued by National Weather Service Reno NV
1250 PM PDT Tue May 20 2025

.Discussion...

.Synopsis...
Warming trend and areas of Moderate HeatRisk in the Valley
through the middle of the week as ridging aloft briefly settles
in. Temperatures then expected to fluctuate between near and
slightly above normal late week into the weekend as a more
progressive pattern sets up aloft. Precipitation chances less than
10 percent at this time, but periods of breezy to briefly gusty
winds possible. Elevated fire weather conditions expected to
persist through the end of the week.

&&

.Key Messages...

* Today - Wednesday:
 -Above normal high temperatures in the 80s to low 90s today,with
  Valley highs into the mid 90s and areas of Moderate HeatRisk on
  Wednesday.
 -Very dry conditions and diurnally breezy winds expected as
  elevated fire weather conditions persist.

* Thursday - Sunday:
 -Quick moving, dry shortwaves bring periods of breezy to briefly
  gusty onshore winds Thursday and Friday.
 -Probability of South-Southwest Wind Gusts > 30 mph:
 --Thursday: 60-90%, highest across Delta and vicinity
 --Friday: 30-60%, highest across Delta and vicinity
 -Despite marginal improvements in RH from onshore flow, elevated
  fire weather conditions likely continue, especially during
  periods of strongest winds as systems move through.
 -Fluctuating temperatures expected, with primarily areas of Minor
  HeatRisk through the Valley expected.

.Changes from previous forecast...
 -Slight increase in wind magnitude, but also attendant RH
  recovery with moisture advection Thursday & Friday.

&&

.AVIATION...
VFR conditions prevail across interior northern California over
the next 24 hours. Northerly wind gusts of up to 15 to 20 knots
at times across the Central Valley and Delta through 21Z-00Z
Wednesday, then winds become more westerly.

&&

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

$$