Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 011728
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
928 AM PST SUN FEB 1 2015

.SYNOPSIS...
UPPER-LEVEL HIGH PRESSURE WILL CREATE DRY AND WARMER THAN NORMAL
HIGH TEMPERATURES THROUGH THE WEEK...WITH WARMEST DAYS FORECAST
THURSDAY THROUGH SUNDAY. A REDEVELOPING SHALLOW MARINE LAYER WILL
CREATE PATCHY NIGHT/MORNING LOW CLOUDS AND FOG ALONG THE COAST AND
COASTAL VALLEYS.

&&

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

AT 9 AM PST...WATER VAPOR SATELLITE IMAGERY DISPLAYED AN UPPER-LEVEL
LOW CENTERED OVER SOUTHERN BAJA...AND AN UPPER-LEVEL RIDGE BUILDING
OVER CENTRAL CA. VISIBLE SATELLITE SHOWED A FEW PATCHES OF LOW
CLOUDS AND FOG OVER THE COASTAL WATERS...AND OVER NORTHERN ORANGE
COUNTY. THE 01/1200 UTC KNKX SOUNDING DISPLAYED NORTH TO NORTHEAST
WINDS ALONG THE PROFILE...AND A CALCULATED PRECIPITABLE WATER OF
0.63 INCHES. SKIES WILL START OUT THE DAY BEING MOSTLY CLEAR...WITH
HIGH CLOUDS MOVING INTO THE AREA BY THIS AFTERNOON. HIGH
TEMPERATURES WILL BE AROUND 5 DEGREES F ABOVE NORMAL.

UPPER-LEVEL HIGH PRESSURE TO OUR NORTHWEST WILL BUILD OVER THE
REGION AND MOVE TO OUR SOUTH THROUGH THE END OF THE WEEK. H500
HEIGHTS ARE FORECAST TO BUILD TO AROUND 582-584 DM BY THURSDAY AND
LINGER THROUGH SUNDAY...WITH THOSE BEING THE WARMEST DAYS WITH
FORECAST HIGHS OF 5 TO 15 DEGREES F ABOVE NORMAL. MONDAY THROUGH
WEDNESDAY WILL ALSO BE WARM FOR THIS TIME OF YEAR...BUT A FEW
DEGREES COOLER COMPARED TO LATER THIS WEEK. HI-RESOLUTION MODELS ARE
HINTING AT A RETURN OF NIGHT AND MORNING MARINE LOW CLOUDS/FOG THIS
WEEK AS WEAK ONSHORE FLOW REDEVELOPS...MAINLY INFLUENCING THE
COAST AND COASTAL VALLEY LOCATIONS. AS THE RIDGE
BUILDS...NIGHT/MORNING LOW CLOUDS MAY BECOME MORE SHALLOW AND
GENERATE PATCHY DENSE FOG OVER COASTAL AREAS BY THURSDAY. DRY
WEATHER WILL CONTINUE THROUGH THE NEXT 7 DAYS.

&&

.AVIATION...
011648Z...COAST/VALLEYS...THROUGH 02/0600 UTC...UNRESTRICTED
VIS...WITH SKC BECOMING SCT-BKN CLOUDS AOA 20000 FT MSL AFTER 2100
UTC. 02/0600-1500 UTC...CHANCE OF PATCHY DENSE FOG/LOW STRATUS
DEVELOPING WITHIN ABOUT 5 SM OF THE COAST...POSSIBLY IMPACTING
KSAN...KCRQ AND KSNA. BASES OF LOW STRATUS WOULD BE AROUND 300-500
FT MSL AND TOPS 500-700 FT MSL. CONFIDENCE IN FOG/LOW STRATUS
AFFECTING COASTAL TAF SITES IS LOW-TO-MODERATE AT THE MOMENT. ANY
FOG/STRATUS SHOULD CLEAR OUT DURING THE 02/1500-1700 UTC TIME-FRAME.
OTHERWISE...UNRESTRICTED VIS AND SCT-BKN CLOUDS AOA 20000 FT MSL
DURING THE 02/0600-1700 UTC TIME-PERIOD.

MTNS/DESERTS...UNRESTRICTED VIS THROUGH MONDAY MORNING. SKC BECOMING
SCT-BKN CLOUDS AOA 20000 FT MSL AFTER 2100 UTC.

&&

.MARINE...
832 AM....NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH THURSDAY.

&&

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

&&

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

&&

$$

PUBLIC...JJT
AVIATION/MARINE...HARRISON







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