Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 032048
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
148 PM PDT FRI JUL 3 2015

.SYNOPSIS...
LESS HUMID AND DRY THROUGH NEXT WEEK. SEASONAL WEATHER...A
MODERATELY DEEP MARINE LAYER AND BREEZY AFTERNOON WEST WINDS IN
THE MOUNTAINS AND DESERTS WILL DEVELOP NEXT WEEK AS FLOW IN THE
MID-LEVELS SHIFTS TO THE SOUTHWEST.

&&

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

THE 03/1200 UTC ECMWF AND GFS ARE IN RELATIVELY GOOD AGREEMENT
THROUGH THE LONG-TERM.

AT 1 PM PDT...WATER VAPOR SATELLITE IMAGERY DISPLAYED A BROAD
UPPER-LEVEL HIGH STRETCHING FROM NEVADA TO NORTHERN ARIZONA...AND
AN UPPER-LEVEL LOW AROUND 500 MILES W OF SAN DIEGO. VISIBLE
SATELLITE SHOWED SCATTERED MID AND UPPER-LEVEL CLOUDS OVER
PORTIONS OF THE CWA...AND LOW-LEVEL CLOUDS OVER SOME OF THE
BEACHES. THE MID AND HIGH-LEVEL CLOUDS SHOULD MAKE FOR A COLORFUL
SUNSET. THE SLIGHT CHANCE OF THUNDERSTORMS OVER THE HIGHEST PEAKS
OF THE SAN BERNARDINOS WERE REMOVED FROM THE FORECAST DUE TO THE
AIR BEING TOO DRY.

THE AFOREMENTIONED UPPER-LEVEL HIGH WILL MOVE SOUTH THROUGH EARLY
NEXT WEEK...WHILE THE CUT-OFF UPPER-LEVEL LOW TO OUR WEST PUSHES
TOWARDS THE BAY AREA. THIS WILL SHIFT OUR FLOW FROM SOUTHERLY TO
DRY AND SOUTHWESTERLY THIS WEEKEND INTO NEXT WEEK...AND INCREASE
ONSHORE PRESSURE GRADIENTS. THE RESULT WILL BE A MODERATELY DEEP
MARINE LAYER WITH NIGHT/MORNING LOW CLOUDS ALONG THE COAST AND
VALLEYS...AFTERNOON BREEZY WESTERLY WINDS THROUGH MOUNTAIN PASSES
AND IN THE DESERTS...HIGH TEMPERATURES SLIGHTLY BELOW SEASONAL
NORMALS AND PARTLY CLOUDY SKIES EACH AFTERNOON. THIS JUNE-LIKE
PATTERN WILL KEEP THE MARINE LAYER DEPTH AND HIGH TEMPERATURES
VARYING ONLY SLIGHTLY EACH DAY THROUGH THE PERIOD...AND MAY MAKE
IT DIFFICULT TO CLEAR FOR SOME BEACHES IN THE AFTERNOONS.

&&

.AVIATION...
032045Z...COAST/VALLEYS...PATCHY STRATUS WILL CONTINUE NEAR THE
BEACHES THIS AFTERNOON...THEN BKN/OVC STRATUS WILL SPREAD 20-25 MI
INLAND TONIGHT...LIKELY REACHING COASTAL AIRPORTS 03Z-05Z WITH BASES
1100-1400 FT MSL AND TOPS TO 2000 FT MSL. STRATUS COULD BRIEFLY
REACH KONT AFTER 12Z. AREAS OF TERRAIN ABOVE THE VALLEYS WILL BE
OBSCURED...AND LOCAL VIS BELOW 3 MI WILL OCCUR IN SOME OF THE
VALLEYS 08Z-15Z SAT. CLEARING COULD BE QUITE SLOW OR EVEN PARTIAL
SATURDAY NEAR THE COAST...WITH COASTAL AIRPORTS LIKELY CLEARING
AFTER 18Z.

MTNS/DESERTS...LOCAL SFC WINDS FROM THE WEST 15-25 KT GUSTS 35-40 KT
WILL OCCUR 22Z THROUGH 08Z TONIGHT THROUGH SAN GORGONIO PASS AND
DESERT SLOPES OF THE SAN DIEGO COUNTY MTNS. OTHERWISE BKN CLOUDS
AT/ABOVE 15000 FT MSL AND UNRESTRICTED VIS WILL CONTINUE THROUGH
TONIGHT...WITH DECREASING CLOUDS SATURDAY.

&&

.MARINE...
145 PM...NO HAZARDOUS WEATHER IS EXPECTED THROUGH WEDNESDAY.

&&

.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...JJT
AVIATION/MARINE...MAXWELL



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