Marine Weather Statement 4, NWS San Diego, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
930 AM PST WED JAN 31 2007

.SYNOPSIS...DEPARTING UPPER LEVEL LOW PRESSURE AND RESIDUAL MOISTURE
WILL CAUSE A FEW LINGERING SHOWERS INTO THURSDAY MORNING. PARTLY
CLOUDY AND A LITTLE WARMER THURSDAY AFTERNOON THROUGH FRIDAY IN
DRIER NORTHWEST FLOW ALOFT. MOSTLY CLEAR AND MUCH WARMER THIS
WEEKEND AND EARLY NEXT WEEK UNDER HIGH PRESSURE WITH WEAK OFFSHORE
FLOW.

&&

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

.SHORT TERM (TODAY-SAT)...THERE WAS VARIABLE CLOUDINESS TODAY WITH
ISOLATED SHOWERS...MAINLY W OF THE MOUNTAINS. THE 12Z NKX SOUNDING
WAS MOIST BELOW 700 MB WITH WLY WINDS THROUGH MOST OF THE COLUMN.
ONSHORE GRADIENTS WITH ABOUT 3 MB SAN-IPL.

THE UPPER LOW WILL MOVE E TODAY FOLLOWED BY NW TO N FLOW ALOFT
THROUGH FRI. THERE WILL CONTINUE TO BE LOW LEVEL MOISTURE INTO THU
FOR PARTLY CLOUDY SKIES WITH POSSIBLE UPSLOPE AND ISLAND EFFECT
SHOWERS. THE CHANCE OF PRECIP WILL GENERALLY TAPER OFF AND TEND TO
BE CONFINED TO SAN DIEGO COUNTY THROUGH THU MORNING. JUST SLIGHT
WARMING THU. THE FLOW ALOFT WILL BECOME DRIER OUT OF THE N FRI WITH
OFFSHORE GRADIENTS DEVELOPING FOR A LITTLE MORE WARMING AND
DECREASING CLOUDINESS. STRONG UPPER LEVEL HIGH PRESSURE WILL BE JUST
OFF THE W COAST AND THERE WILL BE WEAK OFFSHORE FLOW SAT FOR MOSTLY
CLEAR SKIES AND A WARMER DAY.

.LONG TERM (SUN-WED)...STRONG HIGH PRESSURE ALOFT AND OFFSHORE FLOW
FOR MOSTLY CLEAR SKIES AND MORE WARMING EARLY NEXT WEEK. THE HIGH
ALOFT AND OFFSHORE FLOW WILL SLOWLY WEAKEN THROUGH THE MIDDLE OF
NEXT WEEK FOR GRADUAL COOLING.

&&

.AVIATION...
UPPER LOW HAS MOVED ONSHORE BUT MOIST UNSTABLE AIR MASS REMAINS.
EXPECT MULTIPLE CU AND STRATOCU LAYERS THROUGH TONIGHT WITH THE
LOWEST LAYER AROUND 1500 FEET WITH ADDITIONAL LAYERS AROUND 3000
FEET AND 5000 FEET. SCATTERED SHOWERS WILL REDUCE VISIBILITIES TO
MVFR CONDITIONS AT TIMES. ONSHORE FLOW WILL KEEP CLOUDS IN THURSDAY
MORNING BUT SHOULD BECOME SCATTERED DURING THE AFTERNOON ON THURSDAY.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

PUBLIC...DVA
AVIATION...HORTON