AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
915 PM PST SUN FEB 17 2013

.SYNOPSIS...
COOLER WEATHER WILL PREVAIL THROUGH MONDAY...AS ONSHORE FLOW
INCREASES. SOME PATCHY FOG AND DRIZZLE ARE POSSIBLE AS THE MARINE
LAYER DEEPENS AND SPREADS INLAND. FOR TUESDAY AND WEDNESDAY...A COLD
PACIFIC STORM WILL MOVE SOUTH...BRINGING SIGNIFICANTLY COOLER
WEATHER...RAIN...LOW ELEVATION SNOW...AND A FEW THUNDERSTORMS TO THE
REGION. VERY STRONG AND GUSTY WINDS WILL DEVELOP OVER THE MOUNTAINS
AND INTO THE DESERTS TUESDAY EVENING INTO WEDNESDAY. CONTINUED COOL
WITH BELOW NORMAL TEMPERATURES THROUGH NEXT WEEKEND UNDER WEAK
CYCLONIC FLOW ALOFT.

&&

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

DESPITE THE SUNNY SKIES MUCH OF THE DAY...TEMPERATURES WERE SOME 10
TO 15 DEGREES F BELOW THOSE OBSERVED ON SATURDAY. ONSHORE FLOW AND A
COASTAL EDDY HELPED TO DRIVE THE MARINE LAYER INLAND WITH AREAS OF
LOW CLOUDS AND PATCHY FOG. STRONGER WINDS WERE MOSTLY IN THE 15 TO
25 MPH RANGE TODAY WITH ONSHORE PRESSURE GRADIENTS RUNNING ABOUT 5-7
MBS TO THE LOWER DESERTS. THE 00Z MIRAMAR SOUNDING HAD A 4 DEGREE C
INVERSION NEAR 2K FT...WITH SOUTHERLY WINDS NEAR 10 KTS BELOW.

AT SUNSET...MARINE CLOUDS WERE ALREADY SURGING INLAND AS AN EDDY
SWIRLED JUST OFFSHORE. IT WILL CONTINUE INTO MON MORNING AND HELP TO
DRIVE THE STRATUS WELL INLAND OVERNIGHT. SOME PATCHY DRIZZLE AND
LOCAL DENSE FOG WILL BE POSSIBLE WEST OF THE MTNS. A WEAK UPPER-
LEVEL TROUGH IS HELPING TO PULL THE MARINE LAYER INLAND TONIGHT.
EXPECT IT WILL BREAK IN MOST AREAS ON MON...ALLOWING SOME SUN...BUT
IT WILL REMAIN QUITE COOL WITH HIGH TEMPERATURES REMAINING BELOW
NORMAL.