596
FXUS66 KSGX 051015
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
315 AM PDT Wed Jun 5 2024

.SYNOPSIS...
High pressure aloft will continue well above average high
temperatures for inland areas with the heat peaking today or
Thursday depending on location with only slight cooling for the
lower deserts on Friday as cooling spreads inland. Gradual cooling
will continue through Sunday with Sunday high temperatures for the
deserts still around 5 degrees above average. There will be
slight warming for early next week followed by slight cooling for
the middle of next week. Night and morning coastal low clouds will
spread a little farther into the valleys for the weekend into
early next week.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

.SHORT TERM (Today through Friday)...
High pressure aloft over California will continue the warming west
of the mountains today and for the deserts into Thursday with only
slight cooling for the lower deserts on Friday as cooling spreads
inland. The heat is expected to be mostly non-record-setting in
terms of daytime high temperatures. However, it will still be
dangerously hot each day for the deserts with an Excessive Heat
Warning for today through Friday.

There could be some daily warmest overnight temperature records
tied or broken on Thursday and Friday, mostly for the mountains,
deserts, and portions of the Inland Empire. Palm Spring has around
a 55 percent chance of tying or breaking the existing warmest
daily low temperatures of 80 on Thursday and 79 on Friday.

Widespread low clouds across the southern California bight
extend inland across all of the Orange County coastal plain. For
San Diego County, the low clouds are expected to gradually spread
back into the western San Diego County valleys through sunrise. By
Friday, the marine layer is expected to begin deepening with low
clouds for Thursday night and Friday morning spreading farther
inland into the valleys.

&&

.LONG TERM (Saturday through Tuesday)...
A weak trough of low pressure near the California coast will
spread cooling inland over the weekend with Saturday slightly
cooler and Sunday another few degrees cooler but with Sunday high
temperatures still around 5 degrees above average with highs
around 105. It may warm slightly for Monday and Tuesday. The
marine layer will mostly fluctuate between 2000 and 2500 feet deep
with night and morning coastal low clouds spreading inland into
portions of the inland valleys each night.

&&

.AVIATION...
050930Z...Coast/Valleys...Low clouds based at 1000-1400 feet MSL
with tops to 1600 feet will spread only locally into inland valleys
through 14Z. Vis 2-5SM BR inland and on higher coastal terrain.
Clearing from inland toward the coast 15-19Z but little if any
clearing at immediate coast. Low clouds to push ashore after 00Z and
locally into inland valleys again overnight into Thursday, with very
similar coverage, bases and vis.

Otherwise...Clear with unrestricted vis today and tonight.

&&

.MARINE...
No hazardous marine conditions are expected through Sunday.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory from 10 AM this morning to 9 PM PDT Friday for San
     Bernardino and Riverside County Valleys-The Inland Empire.

     Excessive Heat Warning from 10 AM this morning to 9 PM PDT
     Friday for Apple and Lucerne Valleys-Coachella Valley-San
     Diego County Deserts-San Gorgonio Pass Near Banning.

PZ...None.

&&

$$

PUBLIC...17
AVIATION/MARINE...MM