890
FXUS66 KSGX 060452
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
952 PM PDT SUN JUL 5 2026
SYNOPSIS
CLEAR SKIES AND DRY WEATHER PREVAILS FOR MUCH OF THE WEEK, WITH
INCREASING TEMPERATURES AS HIGH PRESSURE BUILDS. MODERATE HEATRISK
RETURNS FOR THE DESERTS AS EARLY AS MONDAY, WITH HIGHS LIKELY
PEAKING WEDNESDAY/THURSDAY REIGON-WIDE. A SHALLOWER MARINE LAYER
WILL ALLOW FOR COASTAL AND MARINE FOG AND LESS INLAND SPREAD
THROUGH THE END OF THE WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
..UPDATED AVIATION DISCUSSION
THE MARINE LAYER BURNED OFF EFFICIENTLY THIS MORNING, WITH CLOUDS
CLEARING ALL INLAND AREAS BY 9:30AM. MID-LEVEL WATER VAPOR IMAGERY
SHOWS DRIER AIR FUNNELING INTO SOUTHERN CALIFORNIA AND THE DESERTS,
WITH THE MOISTURE BEING SHUNTED FURTHER NORTH INTO NEVADA AND
NORTHERN ARIZONA. TEMPERATURES WILL BE FREE TO WARM THIS AFTERNOON
UNDER GENERALLY CLEAR SKIES, AND HIGHS SHOULD BE AT OR SLIGHTLY
ABOVE WHERE THEY WERE ON SATURDAY. THE MOISTURE WILL CONTINUE TO BE
PUSHED OUT OF THE REGION AS HIGH PRESSURE BUILDS OVER THE FOUR
CORNERS ON MONDAY, AND MODERATE HEATRISK WILL RETURN FOR THE LOW
DESERTS AS HIGH TEMPERATURES PUSH TO 110+. THE WARMING TREND WILL
CONTINUE THROUGH THE WEEK AS HIGH PRESSURE ELONGATES INTO SOUTHERN
CALIFORNIA AND THE MARINE LAYER CONTINUES TO BECOME COMPRESSED EACH
MORNING, ALLOWING FOR MORE COASTAL FOG AND LESS INLAND SPREAD. THE
THERMAL RIDGE AXIS WILL SHIFT OVER CA BY MID TO LATE WEEK, WITH
TEMPERATURES LIKELY PEAKING THURSDAY. AFTERNOON HIGHS IN THE HIGH
DESERT MAY BE ABOVE 105F AND LOW DESERTS POTENTIALLY UP TO 115F,
WHILE MOUNTAINS AND INLAND VALLEYS LOOK TO BE IN THE 90S TO LOW
100S IF THE UPPER LEVEL PATTERN STAYS ON TRACK.
TEMPERATURES LATE WEEK INTO NEXT WEEKEND SHOULD COOL A BIT WITH AN
APPROACHING LOW OFF THE COAST OF CA FORCING THE HIGH BACK TOWARDS
THE FOUR CORNER REGION, POTENTIALLY EVEN FURTHER NORTH INTO
WYOMING. SHOULD THIS OCCUR, THE GREAT BASIN WOULD SEE VERY HOT AND
DRY TEMPERATURES WHILE SUBTROPICAL MOISTURE WILL BE ALLOWED TO
MOVE BACK UP INTO ARIZONA AND CALIFORNIA, POTENTIALLY KICKING OFF
SOME MONSOON STORMS. STAY TUNED.
AVIATION
060600Z....COAST/VALLEYS...LOW CLOUDS ARE EXPECTED TO REDEVELOP AND
PUSH AROUND 15 MILES INLAND AFTER 07Z IN SD COUNTY AND AFTER 10Z FOR
OC. BASES ARE EXPECTED TO BE AROUND 800-1200FT MSL. LOW CLOUDS WILL
BEGIN RETREATING TO THE COAST AFTER 15Z MONDAY, CLEARING THE AREA BY
17-18Z. LOW CLOUDS WITH SLIGHTLY LESS BASES WILL BEGIN TO FORM AND
REGATHER ALONG THE COASTLINE (MAINLY SAN DIEGO) BY 02-04Z TUE. AND
EVENTUALLY FILL INTO THE INLAND VALLEYS THROUGHOUT THE REMAINDER OF
THE FORECAST PERIOD, WHILE SLIGHTLY LOWERING IN THE PROCESS.
OTHERWISE...UNRESTRICTED VIS AND DECREASING CLOUD COVER AT/ABOVE
20,000 FT MSL THROUGH THE END OF THE TAF PERIOD.
MARINE
GUSTS NEAR 20 KTS WILL BE POSSIBLE AT TIMES IN THE AFTERNOONS NEAR
SAN CLEMENTE ISLAND TODAY THROUGH WEDNESDAY. OTHERWISE, NO HAZARDOUS
MARINE CONDITIONS ARE EXPECTED THROUGH THURSDAY.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
PUBLIC...ZUBER
AVIATION/MARINE...STEWEY
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