413
FXUS66 KSGX 100847
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
147 AM PDT MON AUG 10 2026
SYNOPSIS
MONSOONAL MOISTURE IN EAST TO SOUTHEAST FLOW ALOFT WILL BRING
SCATTERED SHOWERS AND THUNDERSTORMS TO THE MOUNTAINS, DESERTS, AND
INLAND VALLEYS THROUGH TUESDAY, MAINLY DURING THE AFTERNOON.
MONSOONAL MOISTURE WILL THEN DECREASE THROUGH NEXT WEEKEND. HIGH
TEMPERATURES WILL GRADUALLY COOL INTO THE MIDDLE OF THIS WEEK WITH
HIGH TEMPERATURES FOR THE MOUNTAINS AND VALLEYS AS MUCH AS 5 TO
10 DEGREES BELOW AVERAGE FOR WEDNESDAY THROUGH SATURDAY.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH WEDNESDAY)
HIGH PRESSURE ALOFT WILL SLOWLY WEAKEN THROUGH MIDWEEK. MONSOONAL
MOISTURE IN EAST TO SOUTHEAST FLOW ALOFT WILL BRING SCATTERED
SHOWERS AND THUNDERSTORMS TO THE MOUNTAINS, DESERTS, AND INLAND
VALLEYS THROUGH TUESDAY, MAINLY DURING THE AFTERNOON. MONSOONAL
MOISTURE WILL THEN DECREASE THROUGH NEXT WEEKEND WITH ONLY A
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS FOR WEDNESDAY
AFTERNOON.
THERE WILL BE A COOLING TREND INTO THE MIDDLE OF THE WEEK WITH
HIGH TEMPERATURES FOR THE MOUNTAINS AND INLAND VALLEYS FALLING TO
AS MUCH AS 5 TO 10 DEGREES BELOW AVERAGE FOR WEDNESDAY THROUGH
SATURDAY. THE HEATRISK WILL DECREASE EACH DAY THROUGH THE MIDDLE
OF THE WEEK. THERE WILL WIDESPREAD MODERATE HEATRISK FOR THE
DESERTS TODAY WITH AREAS OF MODERATE HEATRISK FOR THE INLAND
VALLEYS AND LOWER ELEVATIONS OF THE MOUNTAINS WITH ANY REMAINING
MODERATE HEATRISK BY WEDNESDAY ONLY FOR PORTIONS OF THE LOWER
DESERTS.
LONG TERM (THURSDAY THROUGH SUNDAY)
DRIER INLAND AND NOT AS HOT THROUGH NEXT WEEKEND. HIGH
TEMPERATURES WILL COOL A FEW DEGREES ON THURSDAY, THEN SLOWLY WARM
THROUGH NEXT WEEKEND. HIGH TEMPERATURES ON THURSDAY WILL BE AS
MUCH AS 5 TO 10 DEGREES BELOW AVERAGE FOR THE MOUNTAINS AND INLAND
VALLEYS, THEN AROUND 5 DEGREES BELOW AVERAGE FOR THOSE AREAS FOR
NEXT SUNDAY.
HIGH TEMPERATURES ON THURSDAY WILL RANGE FROM THE 70S NEAR THE
COAST TO THE MID 80S TO AROUND 90 FOR THE INLAND EMPIRE WITH 100
TO 104 FOR THE LOWER DESERTS. FOR SUNDAY, HIGH TEMPERATURES WILL
RANGE FROM THE 70S NEAR THE COAST TO THE UPPER 80S TO MID 90S FOR
THE INLAND EMPIRE WITH 104 TO 108 FOR THE LOWER DESERTS.
AVIATION
100600Z....COAST...PATCHY LOW CLOUDS TO GRADUALLY DEVELOP OVERNIGHT,
SLOWLY INCREASING IN COVERAGE, WITH BEST CHANCES OF CIGS AT COASTAL
TAF SITES BETWEEN 11-15Z TUESDAY. BASES AROUND 700-1100 FEET MSL.
SCATTER OUT OF ANY CIGS TUESDAY BY 16Z. VFR CONDITIONS EXPECTED
MONDAY AFTERNOON AND EVENING.
VALLEYS/MOUNTAINS/DESERTS...SCT-BKN CLOUDS MOSTLY ABOVE 15000 FEET
THROUGH 18Z MONDAY. SCATTERED TSRA OVER MTNS WITH AN ISOLD TSRA OR
TWO IN THE HIGH DESERT 19Z MONDAY TO 02Z TUESDAY WITH BASES AROUND
9000 FEET MSL WITH TOPS TO 50000 FEET. ANY TSRA COULD PRODUCE
LIGHTNING, STRONG UP/DOWNDRAFTS AND ASSOCIATED VIS REDUCTIONS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH FRIDAY.
BEACHES
HIGH TIDES WILL EXCEED 7 FEET DURING EVENINGS MONDAY THROUGH
WEDNESDAY BETWEEN 800-930 PM, RESULTING IN MINOR TIDAL OVERFLOW OF
LOW-LYING AREAS ALONG THE BEACH. SURF WILL BE LOW AND IS NOT
EXPECTED TO ADD MUCH TO THE FLOODING POTENTIAL. CHECK THE COASTAL
FLOOD ADVISORY FOR DETAILS.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...COASTAL FLOOD ADVISORY FROM 6 PM MONDAY TO 11 PM PDT WEDNESDAY
FOR ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL
AREAS.
PZ...NONE.
PUBLIC...17
AVIATION/MARINE/BEACHES...KW
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