Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 020948
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
248 AM PDT SUN AUG 2 2015

.SYNOPSIS...
A WEAK TROUGH OF LOW PRESSURE OFF THE WEST COAST WILL MAINTAIN DRY
SOUTHWEST FLOW ALOFT ACROSS SOUTHWEST CALIFORNIA INTO NEXT WEEKEND
WITH WEAK ONSHORE LOWER LEVEL FLOW. THIS WILL BRING LOCALLY GUSTY
WEST WINDS TO THE MOUNTAINS AND DESERTS EACH LATE AFTERNOON THROUGH
LATE EVENING. THE MARINE LAYER AND WEAK ONSHORE FLOW WILL BRING
AREAS OF NIGHT MORNING COASTAL LOW CLOUDS AND PATCHY FOG EXTENDING
INTO THE WESTERN VALLEYS AT TIMES. HIGH TEMPERATURES NEAR AVERAGE
WILL WARM TO SLIGHTLY ABOVE AVERAGE FOR MID WEEK...THEN COOL TO
NEAR TO SLIGHTLY BELOW AVERAGE FOR LATE IN THE WEEK.

&&

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

A A WEAK TROUGH OF LOW PRESSURE WILL REMAIN CENTERED OFF THE WEST
COAST INTO NEXT WEEKEND. A WEAK SHORTWAVE WILL MOVE INLAND TO THE
NORTH ON TUESDAY FOLLOWED BY WEAK SHORTWAVE RIDGING FOR MID WEEK WITH
ANOTHER WEAK SHORTWAVE MOVING INLAND TO THE NORTH NEXT WEEKEND.

THIS WILL BRING DRY SOUTHWEST FLOW ALOFT AND WEAK ONSHORE LOWER
LEVEL FLOW. THE MARINE LAYER AND WEAK ONSHORE FLOW WILL BRING
AREAS OF NIGHT AND MORNING COASTAL LOW CLOUDS AND PATCHY FOG
EXTENDING INLAND TO THE WESTERN VALLEYS AT TIMES. THE MARINE LAYER
WILL BE NEAR 1500 TO 2000 FEET DEEP...DECREASE IN DEPTH SLIGHTLY
FOR MID WEEK..THEN INCREASE IN DEPTH SLIGHTLY FOR THE END OF THE
WEEK. HIGH TEMPERATURES WILL BE NEAR AVERAGE THROUGH
TUESDAY...WARM TO SLIGHTLY ABOVE AVERAGE FOR MID WEEK...THEN COOL
TO NEAR TO SLIGHTLY BELOW AVERAGE FOR LATE IN THE WEEK.

&&

.AVIATION...
020930Z...COAST/VALLEYS...STRATUS WITH BASES 1300-1600 FT MSL AND
TOPS TO 2000 FT MSL WILL CONTINUE TO SPREAD 20-25 MI INLAND THROUGH
THE MORNING...POSSIBLY REACHING KONT AFTER 12Z. LOCAL VIS 3-5 SM
WHERE STRATUS NEARS HIGHER TERRAIN IN THE VALLEYS. STRATUS CLEARING
TO THE COAST 16-19Z. STRATUS WITH SIMILAR BASES/TOPS RETURNING TO
THE COASTAL AIRPORTS AFTER 03/01Z AND MOVING 15-20 MI INLAND
OVERNIGHT. OTHERWISE SCT CLOUDS AOA 20000 FT MSL AND UNRESTRICTED
VIS THROUGH MON MORNING.

MTNS/DESERTS...SCT CLOUDS AOA 20000 FT MSL AND UNRESTRICTED VIS
THROUGH MON MORNING.

&&

.MARINE...
235 AM...NORTHWEST WINDS WITH GUSTS TO 20 KNOTS ARE POSSIBLE OVER
THE OUTER WATERS EACH AFTERNOON AND EVENING THROUGH THURSDAY.
OTHERWISE NO HAZARDOUS MARINE CONDITIONS ARE EXPECTED THROUGH
THURSDAY EVENING.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.
&&

$$

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


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