483
FXUS66 KSGX 011102
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
402 AM PDT THU JUN 1 2023
SYNOPSIS
WEAK HIGH PRESSURE OVER THE AREA FOR FRIDAY THROUGH THE WEEKEND
WILL BRING INLAND WARMING TO SLIGHTLY ABOVE AVERAGE FOR THE
DESERTS FOR SUNDAY WHILE BELOW AVERAGE HIGH TEMPERATURES CONTINUE
FOR THE COAST AND VALLEYS. NIGHT AND COASTAL LOW CLOUDS WON'T
SPREAD QUITE AS FAR INLAND FOR THE WEEKEND, BUT SHOULD STILL COVER
MUCH OF THE VALLEYS. THERE WILL CONTINUE TO BE LIMITED OR NO
DAYTIME CLEARING FOR COASTAL AREAS. FOR EARLY NEXT WEEK, A LOW
PRESSURE SYSTEM FROM THE WEST WILL BRING COOLING AND DEEPENING OF
THE MARINE LAYER ALONG WITH A SLIGHT CHANCE OF AFTERNOON AND
EARLY EVENING THUNDERSTORMS, MAINLY FOR THE SAN BERNARDINO COUNTY
MOUNTAINS AND DESERTS NORTHWARD.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
SHORT TERM (TODAY THROUGH SATURDAY)
THE MARINE LAYER IS AROUND 5500 FEET DEEP WITH LOW CLOUDS OVER
THE COASTAL WATERS EXTENDING WELL INLAND AND ONTO THE COASTAL
MOUNTAIN SLOPES ONCE AGAIN. THERE HAS BEEN SOME LIGHT MEASURABLE
AMOUNTS OVERNIGHT FROM DRIZZLE AND LIGHT RAIN WITH THE GREATEST
COVERAGE NEAR HIGHER TERRAIN ALONG THE ORANGE COUNTY COAST AND IN
THE INLAND VALLEYS AND COASTAL MOUNTAIN SLOPES IN SAN DIEGO
COUNTY WITH AMOUNTS LESS THAN ONE-TENTH INCH THROUGH 3 AM.
THE WEAK UPPER LOW OVER ARIZONA WILL MOVE EAST TODAY WITH A WEAK
LOW PRESSURE SYSTEM MOVING ACROSS NORTHERN BAJA LATE TODAY AND
TONIGHT. THIS WILL BE FOLLOWED BY WEAK HIGH PRESSURE ACROSS THE
AREA THROUGH THE WEEKEND. THE MARINE LAYER WILL BECOME GRADUALLY
SHALLOWER, BUT WITH COASTAL LOW CLOUDS EXTENDING ONTO THE LOWER
COASTAL MOUNTAIN SLOPES FOR TONIGHT INTO FRIDAY MORNING AND ACROSS
MOST OF THE VALLEYS FOR FRIDAY NIGHT INTO SATURDAY MORNING. LITTLE
OR NO DAYTIME CLEARING WILL CONTINUE FOR COASTAL AREAS.
INLAND AREAS WILL BEGIN TO WARM TODAY WITH GREATER WARMER FOR
FRIDAY AND SATURDAY. WITH THE WARMING, HIGH TEMPERATURES FOR THE
DESERTS WILL BE NEAR AVERAGE ON SATURDAY WITH PORTIONS OF THE
VALLEYS STILL 5 TO LOCALLY 10 DEGREES BELOW AVERAGE.
LONG TERM (SUNDAY THROUGH TUESDAY)
ON SUNDAY, A CLOSED LOW PRESSURE SYSTEM FROM THE WEST WILL BE
MOVING TOWARD SOUTHERN CALIFORNIA WITH THE CENTER MOVING TO NEAR
POINT CONCEPTION ON MONDAY. THAT LOW PRESSURE SYSTEM MAY THEN
REMAIN IN THE VICINITY OF SOUTHERN CALIFORNIA FOR MUCH OF THE
WEEK.
THERE IS A SLIGHT CHANCE FOR ELEVATED CONVECTION IN THE MOUNTAINS
AS EARLY AS SUNDAY AFTERNOON, BUT WITH CHANCES A LITTLE GREATER
THOUGH SLIGHT FOR MONDAY AFTERNOON AND EARLY EVENING AND AGAIN
FOR TUESDAY AFTERNOON AND EARLY EVENING AND MOSTLY FROM SAN
BERNARDINO COUNTY NORTHWARD.
MONDAY AND TUESDAY WILL BE COOLER AND THE MARINE LAYER WILL DEEPEN
WITH NIGHT AND MORNING COASTAL LOW CLOUDS EXTENDING FARTHER INLAND
AND ONTO THE COASTAL MOUNTAIN SLOPES AGAIN. COASTAL AREAS WILL
CONTINUE TO SEE LITTLE OR NO DAYTIME CLEARING.
AVIATION
010930Z...COASTS/VALLEYS/COASTAL MOUNTAIN SLOPES...BKN-OVC LOW
CLOUDS WITH BASES 2500-4000 FEET MSL AND TOPS TO 6000 FEET WILL
CONTINUE THIS MORNING. LOCAL CIGS DOWN TO 1500 FEET WITH PATCHY DZ
AND VIS 3-5SM. COASTAL MOUNTAIN SLOPES REMAINING OBSCURED. PARTIAL
CLEARING, MAINLY IN THE INLAND EMPIRE, AFTER 17Z, WITH AREAS OF LOW
CLOUDS WITH BASES MOSTLY ABOVE 3000 FEET MSL ELSEWHERE. CLOUDS
FILLING IN AGAIN AFTER 23Z WITH BASES AROUND 1500-2500 FEET MSL AND
TOPS TO AROUND 4000 FEET.
DESERT MOUNTAIN SLOPES/DESERTS...MOSTLY CLEAR WITH UNRESTRICTED VIS
TODAY AND TONIGHT. AREAS OF WEST WINDS WITH GUSTS 30-40 KT 00-09Z
WITH MODERATE UP/DOWNDRAFTS AND LLWS OVER AND EAST OF THE MOUNTAINS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH 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...17
AVIATION/MARINE...MM
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