148
FXUS66 KSGX 090933
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
233 AM PDT Thu Jul 9 2026

.SYNOPSIS...
The warming trend will continue today with high temperatures for
Friday and Saturday a few degrees cooler. The flow across the area
becomes southeasterly for Sunday into next week allowing for an
influx of monsoonal moisture. For Sunday into the middle of next
week, there will be a chance for showers and thunderstorms with
the greater chances over the mountains and during the afternoon
and early evening each day. Increasing humidity will result in
warmer nights and higher HeatRisk by the middle of next week.

&&

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


...UPDATED AVIATION DISCUSSION...

.SHORT TERM (Today through Saturday)...
The warming trend will continue today with high temperatures for
Friday and Saturday a few degrees cooler. There will be widespread
major HeatRisk for the lower deserts today with widespread
moderate HeatRisk for other inland areas.

High temperatures for today will be around average near the coast
to 5 to 10 degrees above average for the mountains, deserts, and
inland valleys. High temperatures for today will range from the
70s near the coast to the mid 90s to 104 for the Inland Empire
with 113 to 117 for the lower deserts.

Night and morning coastal low clouds will spread into the far
western valleys at times into the weekend.

&&

.LONG TERM (Sunday through Wednesday)...
As the center of strong high pressure moves to the northeast, the
flow across the area will become southeasterly allowing for an
influx of monsoonal moisture for late Saturday into Sunday with
growing spread by the middle of next week as to what degree that
greater moisture persists. There will be chances for showers and
thunderstorms beginning on Sunday with the greater chances over
the mountains and during the afternoon and early evening each day.

There will be warming of low temperatures with low temperatures
mostly 5 to 10 degrees above average by Wednesday and Thursday of
next week. For Wednesday and Thursday of next week, there could be
low temperatures for the coast and valleys mostly in the upper 60s
to mid 70s and in the lower deserts in the mid 80s to lower 90s.

Those warming low temperatures will result in higher HeatRisk for
most areas with moderate or greater HeatRisk for most areas for
Wednesday of next week except at higher elevations in the
mountains and near the coast. There will be moderate to major
HeatRisk for the lower deserts, the valleys, and inland Orange
County.

&&

.AVIATION...
090930Z....Coast/Valleys...Low clouds with bases 800-1200 ft MSL
have filled in coverage up to 20 miles inland. VIS 2-6SM along
elevated coastal terrain and around the I-15 corridor in SD County.
Clouds scatter out 16-18Z. VFR through the evening. Low clouds with
similar bases (and similar VIS reductions in BR) form along the
coast after 03z Fri, patchy initially, then filling in coverage
gradually after 07z up to 20 miles inland.

.Mountains/Deserts...VFR conditions prevail through the TAF period.

&&

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

&&

.BEACHES...
Astronomical high tides of 7.0-7.2 ft are forecast July 12-14.
Higher than normal tides combined with a modest south swell (3 ft
swell 14/15 seconds from 190 degrees) generating surf of 4-6 ft may
result in areas of coastal flooding in low lying areas, boardwalks,
beach parking lots, and beach adjacent streets during evening high
tides.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory until 8 PM PDT Friday for Riverside County
     Mountains-San Bernardino County Mountains-San Bernardino
     and Riverside County Valleys-The Inland Empire-San Diego
     County Mountains.

     Extreme Heat Warning until 8 PM PDT Friday for Coachella Valley-
     San Diego County Deserts-San Gorgonio Pass near Banning.

PZ...None.

&&

$$

PUBLIC...17
AVIATION/MARINE/BEACHES...Westerink

NWS San Diego (SGX) Office