340
FXUS66 KSGX 080420
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
920 PM PDT TUE APR 7 2026
SYNOPSIS
A WARMING TREND WILL CONTINUE THROUGH WEDNESDAY WHEN TEMPERATURES
WILL REACH ABOUT 10 DEGREES ABOVE AVERAGE FOR INLAND AREAS. THIS
WILL BE FOLLOWED BY A COOLING TREND THROUGH SUNDAY, WITH HIGH
TEMPERATURES AS MUCH AS 10 TO 15 DEGREES BELOW AVERAGE FOR THE
HIGHER MOUNTAINS AND PORTIONS OF THE INLAND VALLEYS. A LOW
PRESSURE SYSTEM FROM THE NORTHWEST WILL BRING INCREASING CHANCES
OF SHOWERS FOR LATE FRIDAY THROUGH SATURDAY ALONG WITH A CHANCE OF
THUNDERSTORMS ON SATURDAY. CHANCES FOR ADDITIONAL SHOWERS WILL
CONTINUE INTO LATE SUNDAY OR SUNDAY NIGHT, BUT WITH LOWER
CONFIDENCE IN THE DETAILS. THE CHANCE OF WETTING PRECIPITATION
FROM THE COAST TO THE MOUNTAINS FOR THE WEEKEND IS AROUND 80
PERCENT. THERE WILL BE STRONGER SOUTHWEST TO WEST WINDS FOR THE
MOUNTAINS AND DESERTS ON THURSDAY AND FRIDAY WITH GUSTS OF 35 TO
45 MPH IN THE WIND-FAVORED AREAS. THERE COULD BE ANOTHER ROUND OF
WEST TO NORTHWEST WINDS OF SIMILAR STRENGTH ON SUNDAY. THEN DRIER
WITH A WARMING TREND FOR EARLY NEXT WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
..UPDATED AVIATION/MARINE DISCUSSIONS
ISSUED 110 PM PDT TUE APR 7 2026
SKIES ARE CLEAR THIS
AFTERNOON UNDER A TRANSIENT RIDGE OF HIGH PRESSURE. THE MARINE
LAYER IS ABOUT 2000 FEET DEEP WITH A MODERATELY STRONG INVERSION.
WITH THE HELP OF A WEAK COASTAL EDDY, LOW CLOUDS COVERED MOST OF
THE COASTAL AREAS THIS MORNING AND EXTENDED 10-15 MILES INLAND
BEFORE CLEARING OUT BY ABOUT 11 AM.
THE UPPER LEVEL RIDGE WILL CONTINUE A WARMING TREND FOR INLAND
AREAS THROUGH TOMORROW (WEDNESDAY) WHERE DAYTIME HIGH
TEMPERATURES WILL BE ABOUT 10 DEGREES ABOVE AVERAGE. THE MARINE
LAYER WILL PERSIST AND MAY DEEPEN A LITTLE WITH THE HELP OF THE
COASTAL EDDY, ALLOWING LOW CLOUDS TO SPREAD A LITTLE FARTHER
INLAND TONIGHT.
A COOLING TREND WILL BEGIN ON THURSDAY AND ONSHORE FLOW WILL START
TO STRENGTHEN AS A COLD AND VIGOROUS LOW PRESSURE SYSTEM APPROACHES
FROM THE NORTHWEST. HIGH TEMPERATURES ON THURSDAY WILL MOSTLY BE
A FEW DEGREES LOWER THAN ON WEDNESDAY. HIGH TEMPERATURES ON
THURSDAY WILL RANGE FROM AROUND 70 NEAR THE COAST TO THE MID 70S
TO LOWER 80S FOR THE VALLEYS WITH THE LOWER DESERTS IN THE LOWER
TO MID 90S. THE STRONGER ONSHORE FLOW WILL DRIVE LOW CLOUDS
FARTHER INLAND AS THE MARINE LAYER DEEPENS, POTENTIALLY ALL THE
WAY TO THE COASTAL MTN SLOPES.
THE LOW PRESSURE SYSTEM WILL BRING INCREASING CHANCES FOR SHOWERS
LATE FRIDAY THROUGH SATURDAY ALONG WITH A SLIGHT CHANCE OF
THUNDERSTORMS ON SATURDAY. A REINFORCING SHORTWAVE EMBEDDED IN
THE MEAN NORTHWEST FLOW ALONG THE WEST COAST COULD BRING
ADDITIONAL SHOWERS THROUGH SUNDAY OR SUNDAY NIGHT BUT WITH GREATER
SPREAD IN THE MODEL SOLUTIONS AND RESULTING FORECAST DETAILS.
THROUGH SATURDAY NIGHT, CHANCES FOR MEASURABLE PRECIPITATION RANGE
FROM AROUND 65 PERCENT TOWARD THE COAST TO 80 PERCENT IN THE
MOUNTAIN WITH CHANCES FOR ONE INCH OR MORE OF RAINFALL IN THE
MOUNTAINS AROUND 30 PERCENT AND FOR ONE-HALF INCH OR MORE FOR
COASTAL AREAS AROUND 20 PERCENT. THE SNOW LEVEL WILL LOWER TO
AROUND 6500 FEET LATE SATURDAY AND 6000 FEET ON SUNDAY.
DRY AND WARMER WEATHER IS EXPECTED FOR EARLY NEXT WEEK EVEN THOUGH
WE WILL REMAIN UNDER THE INFLUENCE OF BROAD TROUGHING ALOFT.
AVIATION
080400Z...VFR CONDITIONS CURRENTLY DOMINATE ALL COASTAL AND INLAND
TAF SITES. LOW CLOUDS 1000-1500 FEET MSL CURRENTLY DEVELOPING
OFFSHORE WILL MOVE INTO COASTAL AREAS AFTER 06Z, MOVING ABOUT 15
MILES OF INLAND OVERNIGHT INTO WEDNESDAY. CLOUDS WILL BE SOMEWHAT
PATCHY, AND INTERMITTENT SCATTER OUTS CAN BE EXPECTED OVERNIGHT.
CLOUDS SCATTER OUT 15-17Z FROM EAST TO WEST. CLOUDS 1200-1700 FT MSL
REDEVELOP AFTER 09/06Z.
OTHERWISE, BRISK WEST TO SOUTHWESTERLY WINDS PICK UP OVER THE
MTNS/DESERT FOOTHILLS INTO THE DESERTS AFTER 19Z INTO THE EVENING,
GUSTING TO 20-35 KTS.
MARINE
THERE WILL BE OCCASIONAL WIND GUSTS EXCEEDING 20 KNOTS IN THE OUTER
COASTAL WATERS VICINITY SAN CLEMENTE ISLAND WEDNESDAY NIGHT INTO
EARLY THURSDAY MORNING. THERE IS A 15% CHANCE OF THUNDERSTORMS OVER
THE WATERS FRIDAY NIGHT THROUGH SATURDAY AFTERNOON. OTHERWISE, NO
HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH SATURDAY.
SGX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
PUBLIC...SS
AVIATION/MARINE...CSP
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page