Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 290417
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
915 PM PDT FRI AUG 28 2015

.SYNOPSIS... SATURDAY WILL BE ANOTHER VERY WARM DAY...BUT THE HEAT
WILL ABATE ON SUNDAY AS HIGH PRESSURE OVER THE SOUTHWEST WEAKENS AND
A PACIFIC TROUGH APPROACHES THE WEST COAST. COOLING WILL CONTINUE
THROUGH EARLY NEXT WEEK AS THE TROUGH MOVES INLAND.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

TRIPLE DIGIT TEMPERATURES WERE COMMONPLACE IN THE INLAND VALLEYS
TODAY WITH 107 AT CHINO THE HOT SPOT IN THE INLAND EMPIRE. ONTARIO
AND RIVERSIDE WERE CLOSE BEHIND WITH HIGHS OF 106. RECORDS WERE SET
AT NEWPORT BEACH (84) AND ESCONDIDO (102). THE HIGH AT LINDBERGH
FIELD TODAY WAS 90 WHICH WAS JUST SHY OF THE RECORD OF 91.

TEMPERATURES IN THE LOWER DESERTS ECLIPSED 110 AT SEVERAL PLACES
INCLUDING PALM SPRINGS (112) AND OCOTILLO WELLS (111). EVEN THE
MOUNTAIN LOCATIONS BELOW 6000 FEET WERE VERY WARM WITH HIGHS OF 93
AT JULIAN...97 AT ANZA AND 90 AT LAKE ARROWHEAD. STATIONS ABOVE 6000
FEET WERE COOLER WITH HIGHS IN THE LOW TO MID 80S AT BIG BEAR AND
WRIGHTWOOD. TEMPERATURES THIS EVENING WERE RUNNING 2-4 DEGREES
HIGHER THAN YESTERDAY EVENING...SO IT WILL BE ANOTHER VERY WARM
SUMMER NIGHT.

THUNDERSTORMS WERE ABSENT OVER THE MOUNTAINS TODAY. CUMULUS FORMED
IN THE AFTERNOON BUT THE DRY AIR ADVECTION AND INCREASING STABILITY
TODAY LIMITED THEIR VERTICAL GROWTH.

THE STRONG UPPER RIDGE OVER ARIZONA RESPONSIBLE FOR THE HEAT WILL
BEGIN TO BREAK DOWN SATURDAY. LOWER HEIGHTS AND INCREASING ONSHORE
FLOW WILL BRING A FEW DEGREES OF COOLING FROM THE MTNS TO THE
COAST...BUT THE LOWER DESERTS WILL LIKELY BE JUST AS HOT TOMORROW AS
THEY WERE TODAY. GREATER AND MORE NOTICEABLE COOLING WILL TAKE PLACE
SUNDAY WHEN THE RIDGE OVER EASTERN AZ BUCKLES EVEN MORE AND SHIFTS
INTO NEW MEXICO.

THE PACIFIC TROUGH WILL DIG A LITTLE FARTHER SOUTH AND MOVE CLOSER
TO THE SO-CAL COAST EARLY NEXT WEEK FOR GRADUAL COOLING THROUGH THE
MIDDLE OF NEXT WEEK. TEMPERATURES WILL FALL BACK TO NORMAL BY MONDAY
AND MAY EVEN DIP BELOW NORMAL TUESDAY AND WEDNESDAY. THE MARINE
LAYER WILL BE MUCH DEEPER WITH LOW CLOUDS SPREADING BACK INTO THE
INLAND VALLEYS...AND STRONGER ONSHORE FLOW WILL RESULT IN GUSTY
SOUTHWEST WINDS IN THE MOUNTAINS AND DESERTS EACH AFTERNOON AND
EVENING.

&&

.AVIATION...

290300Z...COAST/VALLEYS...CLEAR SKIES AND UNRESTRICTED VIS THROUGH
SAT MORNING...EXCEPT ALONG THE IMMEDIATE COAST. AFT 08Z...SCT-BKN
MARINE STRATUS LAYER DEVELOPING...POSSIBLY IMPACTING KSAN...KCRQ...
AND KSNA WITH CIGS/VIS AOB 600 FT MSL...TOPS AOB 1000 FT MSL...AND
3SM VIS IN BR. CONFIDENCE IS MODERATE FOR THE STRATUS DEVELOPMENT
BUT LOW FOR TIMING...DURATION AND CIG HEIGHTS.

MOUNTAINS/DESERTS...MOSTLY CLEAR WITH UNRESTRICTED VIS THROUGH SAT.

&&

.MARINE...

800 PM...NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH TUESDAY.

&&

.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...MOEDE
AVIATION/MARINE...PG


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