000
FXUS66 KSTO 211025
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
325 AM PDT Mon Sep 21 2020

.SYNOPSIS...
Chance of showers over the Shasta and Coastal mountains Wednesday
night and Thursday, otherwise dry weather expected. Temperatures
close to average this week, then hot weather returns over the
weekend.

&&

.DISCUSSION...
Clear skies cover the region early this morning. North to
northeast surface pressure gradients have weakened compared to 24
hours ago, but a few gusts in the teens mph are still occurring
across the northern Sacramento Valley and surrounding foothills.
Current temperatures are running a little milder compared to 24
hours ago across most of the Central Valley despite the Delta
Breeze beginning to trend higher.

Widespread moderate to unhealthy AQI currently covers the area,
but smoke and haze is forecast to move to the north and east later
today and tonight as the upstream short-wave trough approaches
inducing stronger southwesterly flow. Otherwise, mostly dry
weather with near average temperatures are expected through much
of the week.

The exception will be a weakening cold front that is forecast to
wash out across far northern California Wednesday night and
Thursday bringing some light precipitation to the northern Coast
Range and southern Cascade Range. Locally breezy southerly winds
expected in the afternoons Tuesday thru Thursday.

&&

.EXTENDED DISCUSSION (Friday THROUGH Monday)...
Frontal system moves through the PacNW Friday with associated
precipitation remaining north of the CWA. EPAC upper high then
builds into NorCal Saturday into Monday resulting in a warming
trend with above normal temperatures. Latest guidance pushes high
temperatures in the Central Valley into the upper 90s by Monday
with mostly 80s to low 90s for the mountains and foothills.

&&

.AVIATION...
VFR conds ovr intr NorCal nxt 24 hrs exc lcl MVFR conds in HZ/FU
vcnty of wild fires. Sfc wnd genly blo 12 kts.

&&

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

&&

$$