Desert Hot Springs, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

915
FXUS66 KSGX 132019
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
119 PM PDT Tue May 13 2025

.SYNOPSIS...
Cool conditions today along with periods of gusty winds, strongest
over the mountains and deserts and isolated light showers in the
mountains. Warmer conditions will return for Wednesday. High
temperatures will remain slightly below average for the middle of
the week. Over the weekend, additional cooling with an uptick in
winds is expected. Night and morning low clouds are expected each
day.

&&

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

A trough of low pressure currently over the Great Basin will
continue to move east today. Later this evening, a shortwave is
expected to move through the mean flow which has the potential to
generate a few isolated showers mainly in the mountains. Another
uptick in westerly winds is expected as the shortwave passes, with
gusts 45 to 55 mph, locally up to 65 mph possible across the
desert mountain slopes in the deserts. Winds will diminish into
Wednesday morning.

The main trough axis will be to our east by Wednesday but the region
will maintain an overall troughing pattern with a ridge of high
pressure building over the Eastern Pacific ocean. The overall
troughing pattern will keep high temperatures just below the
seasonal normal through Friday and maintain night and morning low
cloud coverage for the coast and western valleys. A persistent
onshore pressure gradient will maintain elevated afternoon sea
breezes on the desert mountain slopes and deserts. For the
weekend, there is better agreement that troughing will continue to
prevail over the Western United States maintaining cooler,
cloudier, and windier weather. For Sunday there is more agreement
in a deeper trough developing, but there is uncertainty in how
far west or east the trough will be which will impact
precipitation chances. NBM chances of rainfall totals exceeding
0.10" Saturday night through Sunday are 10 to 20 percent, with the
highest chances on the coastal mountain slopes. There is higher
confidence that the eventual depth of the trough will at least
support increased winds and cloud coverage this weekend. NBM
chances of wind gusts exceeding 50 mph for Saturday and Sunday is
60 to 80 percent for wind prone locations in the mountains and
deserts.

By Monday, there is good ensemble agreement that the trough will be
off to our east with upper level ridging beginning to inch closer to
the West Coast. By Tuesday, the majority of ensemble clusters show
ridging over the West Coast. Current forecast follows the NBM with
warming temperatures for Monday and Tuesday.

&&

.AVIATION...
132000Z...Coast/Valleys...SCT-BKN low clouds based near 3500-4500
feet MSL will continue through the afternoon and evening. Partial
clearing in parts of the LA basin expected with BKN clouds sticking
in San Diego County. BKN-OVC low clouds replenishing the LA Basin
basin again after 06Z Wed. with bases closer to 2500 ft MSL. Better
scatter out expected after 15Z Wed with mostly clear skies
thereafter.

.Mountains/Deserts...Mostly clear through tonight. Westerly winds
with gusts 25-40 kts, locally near 50 kts on desert slopes and
through mountain passes. Confidence moderate on VCTY KPSP seeing
wind gusts over 35 kts between 01Z-10Z. STG UDDFS occurring in lee
of mountains and areas of BLDU in the deserts. Winds diminish after
04Z with mostly clear conditions into Wednesday.

&&

.MARINE...
Stiff west-northwest winds will continue through this evening in the
outer waters. Gusts to 25 kt will lead to hazardous conditions for
small craft, strongest winds near San Clemente Island. A Small Craft
Advisory remains in effect through late tonight. No additional
hazardous marine conditions are expected Wednesday through Saturday.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory until 5 AM PDT Wednesday for Apple and Lucerne
     Valleys-Riverside County Mountains-San Bernardino County
     Mountains-San Diego County Deserts-San Diego County
     Mountains-San Gorgonio Pass near Banning.

PZ...Small Craft Advisory until 11 PM PDT this evening for Waters
     from San Mateo Point to the Mexican Border Extending 10 to
     60 nm out including San Clemente Island.


&&

$$

PUBLIC...CO
AVIATION/MARINE...APR