Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 062137
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
137 PM PST FRI MAR 6 2015

.SYNOPSIS...
HIGH PRESSURE ALOFT AND SURFACE HIGH PRESSURE OVER THE GREAT
BASIN WILL CONTINUE WARMER WEATHER THROUGH SATURDAY...WITH GUSTY
NORTHEAST TO EAST WINDS NEAR THE COASTAL FOOTHILLS. WEAKENING HIGH
PRESSURE ALOFT AND REDEVELOPING WEAK ONSHORE FLOW EARLY NEXT WEEK
WILL COOL HIGH TEMPERATURES TO SLIGHTLY ABOVE AVERAGE...WITH A
RETURN OF NIGHT AND MORNING COASTAL LOW CLOUDS AND FOG.

&&

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

THE 06/1200 UTC ECMWF AND GFS ARE IN GOOD AGREEMENT THROUGH THE
SHORT-TERM AND DIFFER SOMEWHAT IN THE LONG-TERM.

AT 1 PM PST...WATER VAPOR SATELLITE IMAGERY DISPLAYED AN UPPER-
LEVEL RIDGE OVER NORTHERN CA...AND A WEAK UPPER-LEVEL LOW OVER
NORTHERN BAJA. VISIBLE SATELLITE SHOWED CLEAR SKIES ACROSS SW CA.
A 1032 MB HIGH OVER SOUTHERN UTAH AND A 1018 MB LOW NEAR SAN
DIEGO WAS CREATING BREEZY EASTERLY WINDS OVER THE MOUNTAINS...WITH
GUSTS OF 35 TO 45 MPH. TEMPERATURES ACROSS SW CA WERE AROUND 5 TO
10 DEGREES F WARMER THAN THIS TIME YESTERDAY.

UPPER-LEVEL HIGH PRESSURE TO OUR NORTH AND UPPER-LEVEL LOW PRESSURE
TO OUR SOUTH WILL LOITER IN PLACE THROUGH SATURDAY...CREATING WARMER
WEATHER ACROSS SW CA FOR THIS TIME OF YEAR. SURFACE OFFSHORE
PRESSURE GRADIENTS OF -12 TO -16 MB FROM SAN DIEGO TO SALT LAKE
CITY WILL CONTINUE PERIODS OF GUSTY EASTERLY WINDS THROUGH
MOUNTAIN PASSES...CANYONS...COASTAL FOOTHILLS AND INLAND VALLEYS
THROUGH EARLY SATURDAY AFTERNOON. GUSTS NEAR 50 MPH ARE
POSSIBLE...WITH ISOLATED GUSTS NEAR 70 MPH POSSIBLE OVER FAVORED
WINDY LOCATIONS SUCH AS SILL HILL. DOWNSLOPING WINDS AND UPPER-
LEVEL RIDGING ALOFT WILL CONTINUE HIGH TEMPERATURES 10 TO 15
DEGREES F ABOVE NORMAL FOR THIS TIME OF YEAR SATURDAY. THE WIND
ADVISORY REMAINS IN EFFECT THROUGH NOON SATURDAY. SEE LAXNPWSGX
FOR ADDITIONAL DETAILS.

THE RIDGE ALOFT AND SURFACE HIGH PRESSURE OVER THE GREAT BASIN WILL
START TO BREAK DOWN ON SUNDAY...ALLOWING OFFSHORE WINDS TO DIMINISH
AND SLIGHTLY COOL HIGH TEMPERATURES FOR SUNDAY. ONSHORE FLOW WILL
RETURN MONDAY...ALLOWING FOR GREATER COOLING AND POSSIBLY REDEVELOP
MARINE LAYER STRATUS OVER THE COASTAL WATERS. HIGH-RES MODELS ARE
NOW EXTENDING THROUGH MONDAY MORNING...AND ARE HINTING AT POSSIBLE
DENSE FOG NEAR THE COAST. ABOVE NORMAL HIGH TEMPERATURES WILL
CONTINUE NEXT WEEK WITH SLIGHT VARIATIONS EACH DAY AND NIGHT AND
MORNING LOW CLOUDS/FOG DEVELOPING ALONG THE COAST AND VALLEYS AS
HIGH PRESSURE REMAINS NEAR THE REGION.

&&

.AVIATION...
062115Z...CLEAR WITH UNRESTRICTED VIS THROUGH SATURDAY. NORTHEAST
TO EAST WINDS WITH SFC GUSTS 30-50 KT OVER THE COASTAL SLOPES OF
THE MTNS...ADJACENT FOOTHILLS...AND THROUGH AND BELOW THE PASSES
AND CANYONS. THESE WINDS WILL PRODUCE AREAS OF LLWS AND MOD-STG
UDDFS...INCLUDING VCNTY KONT AND KSNA. WINDS WILL WEAKEN THIS
EVENING BEFORE STRENGTHENING OVERNIGHT AND INTO SATURDAY MORNING.

&&

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

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...WIND ADVISORY UNTIL NOON PST SATURDAY FOR ORANGE COUNTY INLAND
     AREAS-RIVERSIDE COUNTY MOUNTAINS-SAN BERNARDINO COUNTY
     MOUNTAINS-SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE
     INLAND EMPIRE-SAN DIEGO COUNTY MOUNTAINS-SAN DIEGO COUNTY
     VALLEYS-SAN GORGONIO PASS NEAR BANNING-SANTA ANA MOUNTAINS
     AND FOOTHILLS.

PZ...NONE.
&&

$$

PUBLIC...JJT
AVIATION/MARINE...23



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