426
FXUS66 KSGX 072010
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
110 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...
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
071730Z...VFR CONDITIONS CURRENTLY DOMINATE ALL COASTAL AND INLAND
TAF SITES. LOW CLOUDS AROUND 800-1200 FEET MSL WILL DEVELOP AFTER
06Z AND EXPAND THROUGH COASTAL AREAS OVERNIGHT INTO WEDNESDAY. THESE
CLOUDS SHOULD BEGIN TO SCATTER OUT TOMORROW MORNING AROUND 16-18Z
FROM EAST TO WEST.
MARINE
OCCASIONAL WIND GUSTS IN THE OUTER WATERS SHOULD EXCEED 20 KNOTS
WEDNESDAY NIGHT. THERE IS A 20% CHANCE OF THUNDERSTORMS FRIDAY NIGHT
AND SATURDAY. OTHERWISE, NO HAZARDOUS MARINE CONDITIONS ARE 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...PG
AVIATION/MARINE...STEWEY
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page