358
FXUS66 KSGX 250437
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
937 PM PDT TUE MAR 24 2026
SYNOPSIS
HIGH TEMPERATURES INLAND AREAS WILL REMAIN AROUND 15 TO 20
DEGREES ABOVE AVERAGE WITH SOME RECORD DAILY TEMPERATURES FOR HEAT
CONTINUING TO BE TIED OR BROKEN, MAINLY FOR THE MOUNTAINS AND
DESERTS BUT OCCASIONALLY FOR THE INLAND VALLEYS AS WELL. NIGHT AND
MORNING COASTAL LOW CLOUDS SPREADING INTO THE FAR WESTERN VALLEYS
AT TIMES. COOLING WILL SPREAD INLAND EARLY NEXT WEEK, BUT WITH
HIGH TEMPERATURES FOR NEXT TUESDAY STILL AROUND 5 TO 10 DEGREES
ABOVE AVERAGE.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
ANOTHER DAY, ANOTHER SET OF DAILY HIGH TEMPERATURE RECORDS BROKEN
AT BIG BEAR, IDYLLWILD, PALOMAR, AND CAMPO. MARINE LAYER LOW
CLOUDS HAVE RETURNED TO THE COASTAL AREAS THIS EVENING WITH CLEAR
SKIES ELSEWHERE. THE MARINE LAYER DEPTH ON THE 00Z KNKX SOUNDING
IS ROUGHLY THE SAME AS 00Z YESTERDAY, SO EXPECT SIMILAR INLAND
EXTENT OF LOW CLOUDS TONIGHT INTO WEDNESDAY MORNING. A WEAK UPPER
LEVEL LOW CURRENTLY AROUND 325 MI SOUTHWEST OF SAN DIEGO WILL LIFT
NORTH AROUND THE WEST SIDE OF THE UPPER RIDGE AND INTO SO CAL
TONIGHT INTO WEDNESDAY. THIS WILL MAINLY GENERATE STRONGER
ONSHORE WINDS ACROSS THE MOUNTAINS AND DESERTS WEDNESDAY AFTERNOON
AND EVENING. GUSTS WILL BE AROUND 30-40 MPH IN THE USUAL WIND-
PRONE PASSES AND DESERT MOUNTAIN SLOPES. OTHERWISE ANOTHER WARM
AND POTENTIALLY DAILY HIGH TEMPERATURE RECORD BREAKING DAY IS IN
STORE WITH HIGHS 15-20 DEGREES ABOVE NORMAL INLAND AND 5-10
DEGREES ABOVE NORMAL NEAR THE COAST.
UPPER LEVEL HIGH PRESSURE WILL REMAIN OVER THE REGION FOR THURSDAY
THROUGH THE WEEKEND. HIGH TEMPERATURES WILL CLIMB A COUPLE DEGREES
EACH DAY THROUGH FRIDAY AS ONSHORE FLOW WEAKENS AND THE MARINE
LAYER BECOMES MORE SHALLOW, WITH WIDESPREAD HIGH TEMPERATURES
CLOSE TO 20 DEGREES ABOVE NORMAL AWAY FROM THE COASTAL AREAS AND
WESTERN VALLEYS. BY FRIDAY, MARINE LAYER CLOUDS BECOME PATCHIER
AND CONFINED TO THE COASTAL AREAS.
MINOR COOLING BEGINS OVER THE WEEKEND AS WEAK TROUGHING STARTS TO
DEVELOP ALONG THE WEST COAST. THERE REMAINS UNCERTAINTY IN THE
POSITION AND AMPLITUDE OF THE TROUGH EARLY NEXT WEEK. FOR SUNDAY,
AROUND 51% OF THE GLOBAL ENSEMBLE MEMBERS HAVE A DEEPER TROUGH
FURTHER WEST, MAINTAINING WARMER WEATHER HERE, ANOTHER 23% HAVE
THE THE TROUGH MUCH FURTHER WEST, ALSO RESULTING IN WARM WEATHER
CONTINUING. AROUND 26% HAVE WEAK TROUGHING AND THE RIDGE BREAKING
DOWN/SHIFTING EAST FASTER, ALLOWING FOR A LITTLE MORE COOLING.
CURRENT TEMP FORECAST LEANS TOWARDS THE WARMTH AND WELL ABOVE
NORMAL TEMPERATURES HANGING ON. THERE IS HIGHER CONFIDENCE EARLY
NEXT WEEK WITH THE TROUGH PROGRESSING WESTWARD INTO THE WEST
COAST. MORE ENSEMBLE MEMBERS ARE NOW SHOWING PRECIPITATION TOWARDS
THE MIDDLE OF NEXT WEEK, THOUGH ENSEMBLE MEAN PRECIPITATION FROM
THE GEFS, EC, AND THEIR AI COUNTERPARTS ARE GENERALLY LESS THAN
0.50" AND SKEWED BY A A COUPLE VERY WET MEMBERS. NBM PROBABILITIES
OF 0.25" OR GREATER FOR TUE-THU MORNING RANGE FROM AROUND 25-35%
FOR THE MOUNTAINS WESTWARD.
AVIATION
250430Z...LOW CLOUDS BASED 900-1400 FT MSL ARE MOVING ONSHORE FROM
THE COAST, FILLING INTO INLAND VALLEYS BY 06-08Z. WITH CIGS, BR/FG
TO REDUCE VIS 0-3SM MAINLY IN EASTERN INLAND VALLEYS (I.E. KRNM) AND
INLAND FOOTHILLS, VIS 3-6SM IN BR ALONG I-15 CORRIDOR (IN SD CO.)
AND 5-6SM IN BR/HZ AT TIMES FOR COASTAL SITES. BEFORE SUNRISE, 12-
14Z, BASES LOWER TO 500-1000 FT, REDUCING VIS TO 0-3SM ALONG I-15
CORRIDOR AND 4-6SM AT THE COAST UNTIL BASES RISE AGAIN AND CLOUDS
SCATTER OUT 16-18Z WED MORNING. LOW CLOUDS WITH SIMILAR BASES ARE
EXPECTED TO DEVELOP AT THE COAST 02-05 THU.
ELSEWHERE, MOSTLY CLEAR AND VFR CONDITIONS WILL PREVAIL THROUGH
WEDNESDAY AFTERNOON.
MARINE
NO HAZARDOUS MARINE CONDITIONS EXPECTED THROUGH SATURDAY.
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...SS
AVIATION/MARINE...WESTERINK
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page