Select Your Area NWS Weather Forecast Office
NWS Area Weather Forecast Discussion
County Warning Area [CWA]: STO
Regional NWS Weather Office: Sacramento, CA

000
FXUS66 KSTO 172205
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
305 PM PDT Wed Jul 17 2019

.SYNOPSIS...
Slight cooling the rest of this week, followed by a slight warm
up early next week. Breezy winds through the Delta and over the
Sierra crest at times.

&&

.DISCUSSION...
Not much change in the overall pattern as a weak trough lingers
along the West Coast into the weekend. Therefore, dry conditions
and seasonably hot temperatures will continue. Temperatures will
trend a little below normal by the end of the work week, generally
2 to 7 degrees below seasonal normals. Look for highs in the
upper 80s to 90s across the Central Valley, and 60s to 80s over
the mountains. Temperatures in the Delta Breeze influenced areas
will vary slightly day-to- day depending on the depth of the
marine layer and strength of onshore flow.

&&

.EXTENDED DISCUSSION (Sunday THROUGH Wednesday)...

An amplified pattern will be in place across much of the mid-
latitudes with a broad upper trough sitting over the eastern
Pacific while a strengthening ridge anchors the Four Corners.
Beginning Sunday and continuing into early/mid next week, this
ridge will gradually expand westward toward the southwestern U.S.
The clockwise flow circulating around the upper high may steer
some monsoonal moisture into the Sierra. A few of the 12Z GEFS
members show light precipitation amounts, but confidence is not
high enough to introduce into the forecast. With mid-level heights
gradually rising over the region, a modest warming trend is likely
bringing temperatures to slightly above average. Conditions would
become hotter if this ridge were to migrate farther west than
ensemble means currently suggest. Overall winds should be light
outside of occasionally breezy conditions over the Sierra crest and
Delta region.  ~BRO

&&

.AVIATION...

VFR SKC-SCT250 conditions through 01z Fri. Southwest wind gusts
20-30 kts vicinity Delta; otherwise, sustained winds generally
below 15 knots.


&&

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

$$

Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather