Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 201057
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
357 AM PDT SAT SEP 20 2014

.SYNOPSIS...
A SLOW MOVING AREA OF LOW PRESSURE WILL CONTINUE TO BRING COOLER
WEATHER AND A DEEP MARINE LAYER THROUGH SUNDAY. PATCHY DRIZZLE IS
POSSIBLE THIS MORNING. THERE WILL ALSO BE A SLIGHT CHANCE FOR
THUNDERSTORMS ACROSS THE SAN BERNARDINO AND RIVERSIDE COUNTY
MOUNTAINS AND THE HIGH DESERT THIS AFTERNOON. A WARMING TREND AND
SHALLOWER MARINE LAYER IS EXPECTED MONDAY THROUGH WEDNESDAY AS
HIGH PRESSURE BUILDS INTO THE REGION.

&&

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

THE MARINE LAYER CONTINUES TO BE UNSEASONABLY DEEP AS MODERATE
ONSHORE FLOW CONTINUES AND AN UPPER LOW APPROACHES THE CENTRAL
COAST EARLY THIS SATURDAY MORNING. THE UPPER LOW IS PROJECTED TO
SWING NORTHEAST AND REACH NORTHERN NEVADA ON SUNDAY. RIPPLES OF
ENERGY AND A WEAK SHORTWAVE WILL BRUSH THROUGH SOCAL THIS
AFTERNOON AND EVENING. ALTHOUGH MOISTURE PARAMETERS ARE QUITE
MARGINAL...THERE WILL BE ENOUGH SYNOPTIC SCALE SUPPORT COMBINED
WITH DECENT INSTABILITY FOR A FEW SHOWERS AND STORMS THIS
AFTERNOON AND EARLY THIS EVENING...OVER THE RIVERSIDE AND SAN
BERNARDINO COUNTY MOUNTAINS AND THE HIGH DESERT. WITH MARGINAL
MOISTURE ANY STORMS THAT DO FORM COULD ALSO CONTAIN DRY LIGHTNING.
THE THREAT FOR STORMS WILL RAPIDLY DIMINISH AFTER SUNSET. TONIGHT
MAY BE THE LAST OF THE STRONG ONSHORE INFLUXES ACROSS SAN DIEGO
AND ORANGE COUNTIES...AS ONSHORE FLOW WILL WEAKEN AND BROAD HIGH
PRESSURE WILL BEGIN TO BUILD ACROSS OUR REGION ON SUNDAY. A
MODERATE WARMUP WILL THEN ENSUE THROUGH MID NEXT WEEK ALTHOUGH
TEMPERATURES WILL ONLY REACH A FEW DEGREES ABOVE NORMAL FOR
THE REGION.

A STRONG UPPER TROUGH MAY BRING GUSTY WINDS AND COOLER WEATHER
ONCE AGAIN TOWARDS THE END OF THE NEW WORK WEEK AS WELL AS A
SUBSTANTIAL MARINE LAYER INFLUENCE. ALTHOUGH THIS FEATURE WILL BE
MOISTURE STARVED THIS FAR SOUTH SO WE`RE NOT MENTIONING
ANY PRECIPITATION AT THIS TIME.

&&

.AVIATION...
201000Z...COASTS/VALLEYS...STRATUS WITH BASES 2000-2300 FT MSL AND
TOPS TO 3000 FT MSL WILL FILL IN OVER ORANGE COUNTY THROUGH 12Z AND
SPREAD INTO PORTIONS OF THE INLAND EMPIRE...INCLUDING KONT...BY 14Z.
STATUS CLEARING 17-19Z...RETURNING TO THE COASTAL AIRPORTS AFTER
21/03Z AND MOVING INTO THE INLAND VALLEYS OVERNIGHT. SIMILAR
BASES/TOPS EXPECTED TONIGHT.

MOUNTAINS/DESERTS...SCT CU BASED NEAR 8000 FT MSL DEVELOPING OVER
THE MTNS THIS AFTERNOON. THERE IS A SLIGHT CHANCE OF SHOWERS
THUNDERSTORMS OVER THE MOUNTAINS AND HIGH DESERT THIS AFTERNOON AS
WELL. ANY STORMS AND CU WILL DISSIPATE BY SUNSET. OTHERWISE...CLEAR
WITH UNRESTRICTED VSBY.

&&

.MARINE...
300 AM...NO HAZARDOUS MARINE 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...BROTHERTON
AVIATION/MARINE...SS






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