Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 031023
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
323 AM PDT MON AUG 3 2015

.SYNOPSIS...
HIGH PRESSURE CENTERED OVER ARIZONA AND NEW MEXICO WILL STRENGTHEN
SLIGHTLY BRINGING A SLIGHT INLAND WARMING TREND THROUGH WEDNESDAY.
FOR COASTAL AREAS...NIGHT AND MORNING LOW CLOUDS AND PATCHY FOG
WILL SPREAD LOCALLY INTO THE VALLEYS AT TIMES WITH WEAK ONSHORE
LOWER LEVEL FLOW. FOR THURSDAY THROUGH SATURDAY...A WEAK LOW
PRESSURE SYSTEM WILL MOVE INLAND THROUGH NORTHERN AND CENTRAL
CALIFORNIA BRINGING A SLOW INLAND COOLING TREND AND SLIGHTLY
DEEPER MARINE LAYER.

&&

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

.SHORT TERM (TODAY THROUGH WEDNESDAY)...
HIGH PRESSURE ALOFT CENTERED OVER ARIZONA AND NEW MEXICO WILL
BRING SLIGHT INLAND WARMING THROUGH WEDNESDAY. THIS WILL PUSH HIGH
TEMPERATURES TO A FEW DEGREES ABOVE AVERAGE IN THE SAN DIEGO
COUNTY DESERTS AND AROUND 5 DEGREES ABOVE AVERAGE IN THE COACHELLA
VALLEY. THIS IS EXPECTED TO PUSH WARMEST HIGH TEMPERATURES IN
PORTIONS OF THE COACHELLA VALLEY FOR TUESDAY AND WEDNESDAY ABOVE
THE 112 DEGREE THRESHOLD FOR A HEAT ADVISORY.

FOR COASTAL AREAS...A MARINE LAYER NEAR 2000 FEET DEEP WILL
DECREASE IN DEPTH SLIGHTLY TO AROUND 1500 FEET THROUGH WEDNESDAY.
SATELLITE IMAGERY SHOWS LOW CLOUDS AND PATCHY FOG EXTENDING INLAND
INTO THE WESTERN VALLEYS...SIMILAR TO THIS PAST WEEKEND. WITH A
SLIGHTLY SHALLOWER MARINE LAYER...LOW CLOUDS ARE NOT EXPECTED TO
EXTENDED QUITE AS FAR INLAND BY TUESDAY NIGHT AND WEDNESDAY.

&&

.LONG TERM (THURSDAY THROUGH SUNDAY)...
A TROUGH OF LOW PRESSURE OFF THE WEST COAST WILL MOVE INLAND WITH
A SLOW COOLING TREND BEGINNING THURSDAY AND CONTINUING THROUGH
SATURDAY. THIS WILL BRING COOLING OF AROUND 10 DEGREES IN THE
LOWER DESERTS WITH MINIMAL COOLING NEAR THE COAST. THE MARINE
LAYER WILL DEEPEN SLIGHTLY WITH AREAS OF NIGHT AND MORNING LOW
CLOUDS AND PATCHY FOG EXTENDING INTO PORTIONS OF THE WESTERN
VALLEYS. THE TROUGH OF LOW PRESSURE WILL WEAKEN ON SUNDAY WITH
SLOW INLAND WARMING RETURNING.

&&

.AVIATION...
030935Z...COAST/VALLEYS...STRATUS WITH BASES 1100-1500 FT MSL AND
TOPS TO 2000 FT MSL WILL CONTINUE TO MOVE 20-25 MI INLAND THROUGH
THE MORNING. LOCAL VIS 3-5 SM IN BR WHERE STRATUS NEARS HIGHER
TERRAIN IN THE VALLEYS. CLOUDS CLEARING TO THE COAST 17-
20Z...RETURNING TO THE SAN DIEGO COUNTY COASTAL AIRPORTS 04/02-04Z
AND SPREADING NORTH AND 20-25 MI INLAND OVERNIGHT. LITTLE CHANGE IN
BASES/TOPS TONIGHT INTO TUE MORNING.

MTNS/DESERTS...FEW CU OVER THE RIDGES IN THIS...OTHERWISE FEW-SCT
CLOUDS AOA FL200 WITH UNRESTRICTED VIS THROUGH TUE MORNING.

&&

.MARINE...
240 AM...NORTHWEST WINDS 15 TO 20 KT OVER THE OUTER WATERS EACH
AFTERNOON AND EVENING THROUGH WEDNESDAY. GUSTS NEAR 25 KT ARE
POSSIBLE TUE AFTERNOON AND EVENING...CREATING CONDITIONS THAT MAY BE
HAZARDOUS TO SMALL CRAFT. NO HAZARDOUS MARINE WEATHER IS EXPECTED
THURSDAY AND FRIDAY.

&&

.SKYWARN...
SKYWARN ACTIVATION WILL NOT BE NEEDED TODAY.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...HEAT ADVISORY FROM NOON TUESDAY TO 6 PM PDT WEDNESDAY FOR
     COACHELLA VALLEY-SAN GORGONIO PASS NEAR BANNING.

PZ...NONE.
&&

$$

PUBLIC...17
AVIATION/MARINE...SS



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