319
FXUS66 KSTO 011809
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1109 AM PDT Wed Jul 1 2026



.KEY MESSAGES...

 - Cooler temperatures through Thursday with light onshore winds

 - Warmer and more seasonable temperatures Friday through July
   4th, followed by a gradual cooling trend.

 - Slight chance (5-10%) for isolated mountain thunderstorms
   along the Sierra early to mid next week.

&&

.DISCUSSION...

Clear skies are being observed across interior Northern
California this afternoon via GOES West visible imagery. A
longwave troughing pattern remains in place overhead resulting in
temperatures near-seasonal to slightly below July normals. This
will continue on Thursday, with continued light to breezy
afternoon and evening Delta Breeze influence.

Longwave troughing begins to break down by Friday as heights aloft
increase leading to warmer, more seasonable temperatures through
July 4th weekend. Troughing develops offshore early next week, prompting
a slight cooling trend and breezier onshore winds as the week
continues. High pressure will also begin building over the Four
Corners region around this same time, potentially advecting a weak
plume of monsoonal moisture northward depending on western extent
of the ridge. In turn, this will bring a slight (5-10%) chance
for isolated mountain thunderstorms to the Sierra early to mid
next week.

&&


.AVIATION...
VFR conditions are expected over the next 24 hours. Southwest
winds gusts 20 to 25 kts in the Delta and over the Sierra Crest.
South to southwest winds in the Sacramento Valley (northwest in
the northern SJ Valley) with gusts 10 to 20 kts from 21Z-06Z then
lowering to less than 12 kts.

&&

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


&&

$$