034
FXUS66 KSGX 121839
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
1139 AM PDT SUN APR 12 2026
SYNOPSIS
PERIODS OF LIGHT TO LOCALLY MODERATE PRECIPITATION EXPECTED THROUGH
MONDAY, MOST WIDESPREAD TODAY. DRY CONDITIONS RETURN TUESDAY AND
WILL PREVAIL THROUGH THE REST OF THE WEEK. PERIODS OF BREEZY WINDS
EXPECTED IN THE AFTERNOONS AND EVENINGS THROUGH MONDAY AND AGAIN MID-
WEEK. NEAR TO BELOW AVERAGE TEMPERATURES EXPECTED FOR MUCH OF THIS
WEEK WITH WARMER CONDITIONS THIS WEEKEND.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THE MAIN COLD FRONT IS MAKING IT'S WAY ACROSS THE INLAND EMPIRE AND
SAN DIEGO COUNTY AS OF 11:30 AM. THE FRONT IS EXPECTED TO WEAKEN
AS IT CONTINUES TO MOVE EAST. LIGHT TO LOCALLY MODERATE RAIN IS
EXPECTED WITH THE FRONTAL PASSAGE, WITH PEAK RAINFALL RATES
0.20-0.30 INCHES PER HOUR. A RAINFALL SUMMARY HAS BEEN HEADLINED
ON OUR WEATHER.GOV/SANDIEGO HOMEPAGE TO CAPTURE THE RAINFALL
TOTALS TODAY. AFTER THE PASSAGE OF THE FRONT, SCATTERED LIGHT TO
LOCALLY MODERATE SHOWERS MAY DEVELOP AROUND THE COASTAL BASIN THIS
EVENING INTO MONDAY MORNING. THE NEXT SHORTWAVE IS EXPECTED TO
MOVE ACROSS SOUTHERN CALIFORNIA MID-DAY MONDAY WHICH WILL SPARK
ANOTHER ROUND OF SCATTERED LIGHT TO LOCALLY MODERATE
PRECIPITATION. PEAK RAINFALL RATES ON MONDAY ARE EXPECTED TO BE
0.20 INCHES PER HOUR OR LESS.
AT HIGHER ELEVATIONS IN THE MOUNTAINS, SNOW CAN BE EXPECTED. SNOW
LEVELS ARE CURRENTLY AROUND 7500 FT AND ARE EXPECTED TO DROP TO 6000
FT BY TONIGHT, LINGERING AT 5500-6000 FT ON MONDAY. AROUND AN INCH
OF SNOW IS EXPECTED BELOW 7000 FT, WITH UP TO 4 INCHES ABOVE 7000
FT. PERIODS OF BREEZY WINDS OVER THE MOUNTAINS AND INTO THE DESERTS
IS EXPECTED THROUGH MONDAY. PEAK GUST OF 35-55 MPH WILL OCCUR IN THE
AFTERNOONS AND EARLY EVENINGS.
COOLER AND DRY CONDITIONS WITH WEAKER WINDS EXPECTED ON TUESDAY.
ANOTHER TROUGH OF LOW PRESSURE IS EXPECTED TO DIG INTO THE PACIFIC
NORTHWEST SOMETIME WEDNESDAY INTO THURSDAY. THE BROAD TROUGHING
PATTERN WILL KEEP TEMPERATURES NEAR TO SLIGHTLY BELOW AVERAGE FOR
MOST LOCATIONS AND INCREASE WESTERLY WINDS IN THE MOUNTAIN AND
DESERT AGAIN. THIS LOW IS EXPECTED TO STAY INLAND, WHICH WILL
KEEP US DRY AND BRING CHANCES FOR SANTA ANA WINDS FOR THE END OF
THE WEEK. WEAK RIDGING COMBINED WITH OFFSHORE FLOW IS EXPECTED TO
BRING WARMER CONDITIONS TO THE AREA NEXT WEEKEND.
AVIATION
121800Z...COASTS/VALLEYS...SCT-OVC CLOUDS BASED 3-6 KFT ARE MOVING
THROUGH THE COASTAL BASIN AS A FRONT PROGRESSES THROUGH THE REGION.
A FEW NARROW BANDS OF SHOWERS ARE MOVING THROUGH SD COUNTY AND THE
INLAND EMPIRE AND WILL CONTINUE PROGRESSING SOUTHEASTWARD THROUGH
THE AFTERNOON. WITH -SHRA/SHRA, EXPECT MVFR CONDITIONS AND BRIEF
PERIODS OF IFR CIGS/VIS. AFTER FROPA, WINDS SWITCH FROM SW TO W AND
MAINLY VFR CONDITIONS RETURN WITH BASES STAYING MOSTLY ABOVE 3 KFT,
AND REMAINING SCT-BKN THROUGH THE REMAINDER OF THE PERIOD. ISO -SHRA
ACTIVITY PICKS UP AGAIN TONIGHT AFTER 06Z, THEN BECOMING SCT SHRA
AFTER 14Z MONDAY MORNING, YIELDING TO BRIEF PERIODS OF MVFR/IFR
CONDITIONS UNDER SHRA.
MOUNTAINS/DESERTS
WEST TO SOUTHWEST WINDS GUSTS 30-45 KT TO
PERSIST IN MOUNTAIN PASSES, ALONG DESERTS SLOPES AND LOCALLY INTO
THE DESERTS, WEAKENING GRADUALLY AFTER 02Z THIS EVENING, THOUGH
REMAINING ELEVATED INTO MONDAY MORNING (20-35 KTS) AND INCREASING
AGAIN INTO MONDAY AFTERNOON. SHRA/SNSH ACTIVITY TO SLOWLY TAPER OFF
THIS AFTERNOON FROM NORTH TO SOUTH, REMAINING ISOLATED THEREAFTER
THROUGH MONDAY AFTERNOON. VIS DOWN TO 0-5SM IN MTNS WITH FG WHERE
CLOUDS AND TERRAIN MEET; SHSN MAY REDUCE VIS LOCALLY ABOVE 6500 FT
MSL. LOCAL AREAS BLDU (VIS 3-5SM) EXPECTED. MODERATE UP/DOWNDRAFTS
IN LEE OF MTNS.
MARINE
PERIODS OF INCREASED NORTHWEST WINDS WITH GUSTS 15 TO 20 KTS,
ESPECIALLY NEAR SHOWERS, AND CHOPPY SEAS THROUGHOUT TODAY. SHOWERS
TAPER OFF MONDAY.
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...CO
AVIATION/MARINE...WESTERINK
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