122
FXUS66 KSGX 200919
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
219 AM PDT SUN APR 20 2025
SYNOPSIS
DRY AND WARMER THROUGH EARLY NEXT WEEK WITH HIGH TEMPERATURES
NEAR TO AROUND 5 DEGREES ABOVE NORMAL INLAND BY MONDAY. GRADUAL
COOLING FOLLOWS TUESDAY THROUGH SATURDAY. AREAS OF NIGHT AND
MORNING LOW CLOUDS AND FOG CONTINUING THROUGH NEXT WEEK, BECOMING
MORE WIDESPREAD TOWARDS THE MIDDLE OF THE WEEK AS THE MARINE LAYER
DEEPENS. AFTERNOON AND EVENING WINDS WILL STRENGTHEN SLIGHTLY
ACROSS THE MOUNTAINS AND DESERTS FOR THE LATTER HALF OF THE WEEK.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
A FEW PATCHES OF LOW CLOUDS HAVE BEGUN TO DEVELOP JUST OFF THE
COAST, OTHERWISE SKIES ARE CLEAR. LOW CLOUDS MAY BRIEFLY MOVE INTO
THE COASTAL AREAS LATER THIS MORNING, BUT WIDESPREAD COVERAGE IS
NOT EXPECTED. WARMER TODAY WITH HIGHS NEAR SEASONAL AVERAGES.
WE REMAIN UNDER WEAK CYCLONIC FLOW MUCH OF THE WEEK WITH A SERIES
OF SHORT WAVES PASSING BY TO THE NORTH. THE MARINE LAYER WILL
BECOME MORE ESTABLISHED AND DEEPEN EACH SUBSEQUENT NIGHT. BY
WEDNESDAY MORNING, THE MARINE LAYER WILL BE DEEP ENOUGH FOR LOW
CLOUDS TO SPREAD INTO THE INLAND VALLEYS. PERSISTENT ONSHORE FLOW
WILL MODERATE TEMPERATURES WEST OF THE MOUNTAINS WHERE HIGHS WILL
REMAIN NEAR TO SLIGHTLY BELOW NORMAL THROUGH TUESDAY. FOR THE
MOUNTAINS AND DESERTS, BREEZY WESTERLY WINDS DEVELOP EACH
AFTERNOON AND CONTINUE INTO THE LATE EVENING ALONG WITH HIGHS
SLIGHTLY ABOVE NORMAL.
ENSEMBLES HAVE TRENDED TOWARDS THE MORE NORTHERN TRACK OF THE
UPPER LOW LATE IN THE WEEK, BRINGING IT INTO PACIFIC NORTHWEST.
THIS WOULD RESULT IN LESS SIGNIFICANT COOLING WEDNESDAY THROUGH
SATURDAY AND MUCH LOWER PRECIPITATION CHANCES, WHICH ARE NOW
BELOW 5%. FRIDAY AND SATURDAY ARE CURRENTLY FORECAST TO BE THE
COOLEST DAYS OF THE WEEK, WITH HIGH TEMPERATURES AROUND 3-5
DEGREES BELOW NORMAL. THE MARINE LAYER WILL CONTINUE TO DEEPEN
WITH WIDESPREAD LOW CLOUDS WEST OF THE MOUNTAINS EACH NIGHT AND
MORNING FOR THE LATTER HALF OF THE WEEK. DEPENDING ON THE TIMING
OF THE SHORT WAVES, WE COULD SEE SOME PATCHY DRIZZLE IN THE
MORNINGS. BREEZY WEST WINDS WILL INCREASE SLIGHTLY ACROSS THE
MOUNTAINS AND DESERTS EACH AFTERNOON AND EVENING. BY SUNDAY,
ENSEMBLE SOLUTIONS ARE 50/50 WITH DIGGING THE TROUGH SOUTH
THROUGH THE GREAT BASIN, WHICH WOULD RESULT IN CONTINUED COOL
WEATHER, OR A MORE PROGRESSIVE/FURTHER NORTH TRACK WHICH WOULD
ALLOW FOR SOME WARMING SUNDAY.
AVIATION
200930Z....COASTS/VALLEYS...MOSTLY CLEAR SKIES PREVAILING OVER LAND
THOUGH A FEW POCKETS OF LOW STRATUS ARE LURKING ALONG THE
SHORE/BEACHES THIS MORNING. THESE CLOUDS BASED AROUND 700-1000FT MSL
MAY BRING OCCASIONAL CIGS TO THE COASTAL TAF LOCATIONS (WITH
GREATEST CONFIDENCE OF OCCURRENCE AT KSNA: 60%, FOLLOWED BY KSAN:
40%, AND KCRQ: 20%) THIS MORNING. THERE IS A 15% CHANCE OF PATCHY
FOG WITH VISIBILITY 1-2 SM DEVELOPING ALONG THE COAST, PRIMARILY ON
COASTAL MESAS. ANY LOW CLOUDS OR FOG THAT DEVELOP/MOVE ONSHORE
SHOULD CLEAR BY 16-18Z, WITH VFR PREVAILING AND BREEZY ONSHORE WINDS
THROUGH THE AFTERNOON. HIGHER CONFIDENCE IN MORE PLENTIFUL CLOUDS
FILLING IN AROUND 09-12Z MONDAY, WITH BASES LIKELY NEAR 1000-1500FT
MSL.
MOUNTAINS/DESERTS...CLEAR SKIES WITH UNRESTRICTED VIS PREVAILING
THROUGH MONDAY MORNING.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH THURSDAY.
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...MUNYAN
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