Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 061734
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
934 AM PST FRI MAR 6 2015

.SYNOPSIS...
HIGH PRESSURE ALOFT AND SURFACE HIGH PRESSURE OVER THE GREAT
BASIN WILL CREATE 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 06/0000 UTC ECMWF AND 06/0600 UTC GFS ARE IN GOOD AGREEMENT
THROUGH THE SHORT-TERM AND DIFFER SOMEWHAT IN THE LONG-TERM.

AT 9 AM 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 1036 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. PEAK WIND GUSTS SINCE YESTERDAY AFTERNOON ARE...SILL
HILL 71 MPH...BIG BLACK MOUNTAIN 68 MPH...AND LUCKY FIVE RANCH 54
MPH. A PNS WITH OBSERVED PEAK WIND GUSTS WAS ISSUED AT 915 AM THIS
MORNING...AND IS HEADLINED ON OUR WEBPAGE. BREEZY WINDS WILL
DIMINISH THROUGHOUT THE DAY...WITH HIGH TEMPERATURES TODAY RISING
5 TO 10 DEGREES F WARMER THAN 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 IS
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 ALONG THE COAST. ABOVE NORMAL HIGH TEMPERATURES WILL
CONTINUE NEXT WEEK WITH SLIGHT VARIATIONS EACH DAY AND NIGHT AND
MORNING LOW CLOUDS AND FOG DEVELOPING ALONG THE COAST AND VALLEYS AS
HIGH PRESSURE REMAINS NEAR THE REGION.

&&

.AVIATION...
061630Z...CLEAR WITH UNRESTRICTED VIS THROUGH SATURDAY. NORTHEAST
TO EAST WINDS THIS MORNING 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 AFTERNOON BEFORE STRENGTHENING AGAIN TONIGHT AND
INTO SATURDAY MORNING.

&&

.MARINE...
830 AM...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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