904
FXUS66 KSGX 022338
AFDSGX
Area Forecast Discussion
National Weather Service San Diego CA
438 PM PDT Sun Aug 2 2026
.SYNOPSIS... Still very warm conditions are in place with a subtle
cooldown through the middle of the week. Monsoonal moisture is
expected to increase by the middle and end of the week, but chances
for rainfall remain small. Temperatures will continue to be near to
slightly above average as well.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
...UPDATED AVIATION DISCUSSION...
High pressure has began to weaken across the Desert Southwest.
This will begin to bring subtle increases in cooling and onshore
flow over the next few days. Temperatures will not be as hot for
areas west of the mountains this afternoon, though the desert
regions will be similar to yesterday. Onshore winds will slightly
stronger across the mountain desert slopes and adjacent deserts
later this afternoon and evening nearing 25-40 MPH. These winds will
occur again on Monday. The marine layer will remain thinner, with
patchy clouds and fog closer to the coast each morning.
A few degrees of cooling can be expected into the middle of the week
as subtle changes in high`s movement occur. Temperatures will still
remain on the warmer side with highs slightly above normal for
inland valleys, mountains, and deserts with areas of moderate heat
risk. Models indicate an increase in monsoonal moisture moving into
the area during this time period as well with the largest increase
expected on Wednesday, so we can expect more humid conditions by
this time onward. Cumulus clouds are likely to form over the
mountains each afternoon starting Wednesday through later in the
week. Chances for rainfall still look minimal near 20% or less each
day over the higher terrain. Other areas look to see highs near to
slightly above normal with dry weather.
&&
.AVIATION...
010000Z....Coasts/Valleys...Low clouds based 800-1200 ft MSL have
started to develop along the immediate SD coastline; expect clouds
to move into coastal regions after 03Z, increasing in coverage and
moving in to 15-20 miles inland through 13Z. Vis 2-5 SM for higher
coastal terrain. Low clouds will begin to clear from inland areas 15-
16Z Monday then from the coast 16-17Z. Similar based clouds will
develop and move inland again after 02-03Z Mon.
.Mountains/Deserts...VFR conditions expected through the TAF period
with predominantly clear skies.
&&
.MARINE...
No hazardous marine conditions are expected through Wednesday.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory until 8 PM PDT this evening for Orange County
Coastal Areas-San Diego County Coastal Areas.
Extreme Heat Warning until 8 PM PDT Monday for Coachella Valley-
Riverside County Mountains-San Bernardino and Riverside
County Valleys-The Inland Empire-San Diego County Deserts-
San Diego County Mountains-San Gorgonio Pass near Banning.
Extreme Heat Warning until 8 PM PDT this evening for Apple and
Lucerne Valleys-Orange County Inland Areas-San Diego County
Valleys-Santa Ana Mountains and Foothills.
Heat Advisory until 8 PM PDT Monday for San Bernardino County
Mountains.
PZ...None.
&&
$$
PUBLIC...APR
AVIATION/MARINE...CSP
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