596
FXUS66 KSGX 211106
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
306 AM PST FRI FEB 21 2025
SYNOPSIS
SANTA ANA WINDS WILL BE MORE LOCALIZED TO PASSES AND FOOTHILLS
TODAY AS A THIN MARINE LAYER HUGS THE COAST WITH LOW CLOUDS THIS
MORNING. WARM WEATHER WILL CONTINUE INTO THE WEEKEND, WITH
FURTHER WARMING BY EARLY NEXT WEEK AS HIGH PRESSURE ANCHORS OVER
THE REGION. AN AREA OF LOW PRESSURE IS EXPECTED TO MOVE CLOSER TO
SOCAL BY LATER NEXT WEEK, BRINGING COOLER WEATHER WITH AN INCREASED
CHANCE OF PRECIPITATION.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
LIGHT SOUTHERLY WINDS NEAR THE COAST ARE HELPING TO BRING IN
MARINE AIR AND ENHANCE LOW CLOUD DEVELOPMENT THIS MORNING. CLOUD
BASES ARE HIGHER THAN THOSE OF YESTERDAY, SO FOG IS MORE CONFINED
TO HIGHER COASTAL TERRAIN. HREF / NBM MODELS BEGIN TO CLEAR LOW
CLOUDS OUT OF THE COASTAL AREAS BY LATER THIS MORNING. THIS IS
OCCURRING AS OFFSHORE FLOW KEEPS THESE CLOUDS CLOSER TO THE SEA,
WHERE INLAND AREAS ARE SEEING N/E WIND GUSTS 10-25+ MPH. WINDS
WILL BE WEAKER TODAY THAN YESTERDAY WITH PASSES SEEING THE HIGHEST
WINDS NEAR 45 MPH AT TIMES. MOUNTAIN AND DESERT REGIONS WILL SEE
SIMILAR WEATHER TODAY VS. YESTERDAY, BUT FURTHER WARMING WILL
TAKE PLACE WEST OF THE MOUNTAINS WITH MANY LOCATIONS REACHING INTO
THE UPPER 70S AND LOWER 80S.
PRESSURE HEIGHTS ALOFT WILL INCREASE, LEADING TO A MORE STABILIZED
ATMOSPHERE. THIS WILL BRING LESS OF A MARINE LAYER INFLUENCE NEAR
THE COASTAL AREAS WITH FURTHER WARMING TO ALL AREAS BY SUNDAY. LOW
TO MID 80S WILL OCCUR FROM THE LOWER DESERTS TO THE WESTERN
VALLEYS AND INLAND EMPIRE. MOUNTAINS AREAS INTO THE HIGH DESERT
WILL SEE HIGHS IN THE 60S AND 70S. HIGH PRESSURE TO OUR SOUTH WILL
BLOOM INTO A 591 DM HIGH BY EARLY NEXT WEEK, LEADING TO THE PEAK
OF THE HEAT. BY TUESDAY AND WEDNESDAY, WE CAN EXPECT HIGH
TEMPERATURES NEAR 5 TO 10 DEGREES ABOVE AVERAGE WILL BE SEEN AT
THE COAST WITH HIGHS NEAR 15 TO 20 DEGREES ABOVE AVERAGE INLAND AS
A THERMAL RIDGE DOMINATES THE SOUTHWESTERN PART OF THE COUNTRY.
CONFIDENCE IS GROWING THAT PALM SPRINGS WILL SEE THEIR FIRST DAY
IN THE 90S THIS YEAR STARTING AS EARLY AS MONDAY, BEST CHANCE BY
TUESDAY AND WEDNESDAY. CHANCES ARE LOW TO MODERATE OF SEEING 90
DEGREE TEMPERATURES WEST OF THE MOUNTAINS BY THIS TIME, BUT WOULD
NOT BE SURPRISED TO SEE A WARMER FORECAST IN THE COMING DAYS. EVEN
THOUGH IT IS FEBRUARY, MAKE SURE TO TAKE IT EASY IN THE HEAT AS
IT'S BEEN AWHILE FOR ALL OF US!
ENSEMBLE MODELS ARE IN AGREEMENT OF AN AREA OF LOW PRESSURE MOVING
OFF THE COAST INTO OUR VICINITY BY LATER NEXT WEEK. CONFIDENCE ON
THIS FORMING AND BRINGING COOLER WEATHER TO THE AREA IS MODERATE
AT THIS TIME. DETAILS ON THE EXACT PATH OF THE WEATHER SYSTEM AND
IF IT WILL GIVE US ANY PRECIPITATION IS STILL INCONCLUSIVE,
THOUGH MODEL ENSEMBLES START TO SHOW A WETTER PATTERN AS WE ENTER
THE MONTH OF MARCH.
AVIATION
211045Z...COAST...LOW CLOUDS CURRENTLY BASED AT 500-800FT MSL
HAVE FILLED IN ALONG THE COAST AND UP TO 10 MI INLAND THIS
MORNING. THESE BASES WILL LIKELY (50-70% CHANCE) GRADUALLY LOWER
AS THE MORNING PROGRESSES, FALLING TO 300-600 FT MSL BY 12-15Z.
VIS RESTRICTIONS ARE CURRENTLY DOWN TO 3-5 SM FOR INLAND AREAS BUT
DOWN TO 0-2 SM WHERE CLOUDS ARE INTERSECTING THE HIGHER TERRAIN.
IF THE BASES DO FALL TO 300-600FT MSL, VIS RESTRICTIONS TO 3-5 SM
ARE EXPECTED ALONG THE IMMEDIATE COAST (INCLUDING KSAN AND KSNA),
WITH 0-3 SM FOR THE INLAND AREAS AND COASTAL MESAS (INCLUDING
KCRQ). LOW CLOUDS RETREATING OFFSHORE 14-17Z. VERY PATCHY LOW
CLOUDS LOOK TO REDEVELOP ALONG PARTS OF THE IMMEDIATE COAST AFTER
06Z SATURDAY. IF THEY DO, CIGS WOULD BE NEAR 200-500FT MSL WITH
ASSOCIATED VIS RESTRICTIONS 2- 4 SM ALONG THE COASTS AND 0-2 SM
FOR THE COASTAL MESAS.
VALLEYS/MOUNTAINS/DESERTS...VFR CONDITIONS PREVAIL THROUGH SATURDAY
MORNING. NORTH-NORTHEAST TO EASTERLY WINDS OVER MOUNTAINS /
FOOTHILLS/DESERTS AND PARTS OF THE INLAND EMPIRE (GENERALLY AREAS
BELOW/SOUTH OF THE CAJON PASS), REMAINING INTERMITTENTLY GUSTY
THROUGH THIS EVENING. GUSTS TO 20-30 KTS AND MOD UP/DOWNDRAFTS
NEAR AND OVER MOUNTAINS.
MARINE
NO HAZARDOUS MARINE CONDITIONS ARE ANTICIPATED 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...APR
AVIATION/MARINE...MUNYAN
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