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Local Area Forecast Discussion

566
FXUS66 KSTO 232151
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
251 PM PDT Sun Jul 23 2017

.SYNOPSIS...
A slight threat of afternoon and evening thunderstorms over the
Sierra Cascade crest through early this week spreading northward
into Shasta county Tuesday. Cooler temperatures Monday and Tuesday
with a slow warming mid to late week.

&&

.DISCUSSION...
Our relatively short heat wave ends today, as an upper low over
eastern Pacific starts pushing inland on Monday. Airmass cooling
and onshore flow will bring down daytime highs close to normal for
this time of year. The Delta breeze could bring temperatures
slightly below normal to the Delta and Sacramento metro area. Models
still showing enough instability and moisture for a threat of
afternoon Sierra crest storms early this week, though activity
today looks to be mainly east of the crest.

The core of the upper will move onshore by mid day Tuesday
keeping daytime highs close to season normals. As always with
closed type lows, forecast models will be at least a bit
inconsistent but a more southeast wrap around type flow over
Norcal could bring a slight chance of afternoon thunderstorms
over the higher elevations of Shasta county.

The upper low center is forecast to lift to the northeast on
Wednesday so temperatures will begin to trend slowly back up
again. Southwest to west flow aloft should shunt monsoon type
moisture eastward. More stable conditions and less moisture should
end mountain thunderstorm threat across the area, with dry
weather even for late day Wednesday. EK

&&
.EXTENDED DISCUSSION (Thursday THROUGH Sunday)
High pressure builds late next week through the weekend over the
western US. Dry weather is expected as monsoonal moisture should
remain south and east of the area. Temperatures are expected to
hover near the century mark for the majority of the valley through
at least Sunday, with the northern Sacramento valley a few
degrees above 100, and the mountains will be in the 70 to 90
degree range.

&&
.EXTENDED DISCUSSION (Thursday THROUGH Sunday)



High pressure builds late next week through the weekend over the
western US. Dry weather is expected as monsoonal moisture should
remain south and east of the area. Temperatures are expected to
hover near the century mark for the majority of the valley through
at least Sunday, with the northern Sacramento valley a few
degrees above 100, and the mountains will be in the 70 to 90
degree range.

&&

.AVIATION...

Mainly VFR conditions the next 24 hours across interior NorCal.
Winds will remain light today, except gusts to 25 kt near the
Delta and over higher terrain.


&&

.STO WATCHES/WARNINGS/ADVISORIES...
Heat Advisory until 9 PM PDT this evening for Central Sacramento
Valley-Mountains Southwestern Shasta County to Northern Lake
County-Northeast Foothills/Sacramento Valley-Northern Sacramento
Valley-Shasta Lake Area / Northern Shasta County.

&&

$$





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