FXUS66 KSGX 221609
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
900 AM PST TUE DEC 22 2009
.SYNOPSIS...
A COLD LOW PRESSURE SYSTEM WILL BRING STRONG WINDS AND A FEW MORE
SHOWERS TO THE REGION TODAY. HIGH PRESSURE ALOFT AND OFFSHORE FLOW
WILL BRING FAIR SKIES AND WARMER WEATHER LATER IN THE WEEK WITH
LOCAL GUSTY WINDS THROUGH AND BELOW MOUNTAIN CANYONS AND PASSES
WEDNESDAY THROUGH FRIDAY. ANOTHER UPPER LOW WILL BRING A CHANCE OF
SHOWERS SUNDAY AND MONDAY.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
THE FRONT STRENGTHENED OVERNIGHT ENOUGH TO PRODUCE A COUPLE LINES OF
SHOWERS THIS MORNING. THERE WERE EVEN A FEW HEAVY SHOWERS AND
THUNDERSTORMS AND A COUPLE INCHES OF SNOW AT RUNNING SPRINGS. THE
SHOWERS HAVE ALMOST ENDED COMPLETELY...BUT LINGERING ISLAND BANDS
WILL CONTINUE TO IMPACT SAN DIEGO COUNTY THIS MORNING. OTHER THAN
THAT THE WINDS WILL TAKE OVER TODAY AS THE LARGER IMPACT ACROSS THE
REGION. THESE WINDS WILL DECREASE DURING THE EVENING BUT CONTINUE
QUITE STRONG IN THE SAN BERNARDINO MOUNTAINS THROUGH THE NIGHT AS
THE FLOW TURNS NORTHERLY. MEANWHILE SKIES WILL GRADUALLY CLEAR IN
ALL AREAS TODAY...WITH SLOWEST CLEARING ON THE COASTAL SLOPES OF THE
MOUNTAINS. HIGH PRESSURE ALOFT WILL BUILD WEDNESDAY INTO FRIDAY
WITH SOME OFFSHORE SURFACE PRESSURE GRADIENTS DEVELOPING EACH NIGHT.
THEY WILL PRODUCE SOME OFFSHORE WINDS MAINLY THROUGH PASSES AND
CANYONS...AND THEY WILL APPROACH ADVISORY STRENGTH IN FAVORABLE
SPOTS. THAT OFFSHORE FLOW WILL KEEP US IN A COOLER AIR MASS SO OUR
HIGH PRESSURE WARMING TREND WILL ONLY AMOUNT TO TEMPERATURES IN THE
60S THIS WEEK. OVER THE WEEKEND CLOUDS WILL INCREASE IN ADVANCE OF A
WET LOW PRESSURE SYSTEM APPROACHING FROM THE PACIFIC. FOR NOW WE
CARRY A CHANCE OF RAIN MAINLY FOR LATER SUNDAY AND MONDAY...BUT OF
COURSE THE DETAILS ARE REALLY SKETCHY. IT COULD BE QUITE WET OR
ALMOST DRY DEPENDING ON WHAT THIS SYSTEM DOES AND THE EXTENDED
MODELS ARE SHOWING A WIDE RANGE OF POSSIBILITIES.
&&
.AVIATION...
221515Z...DEEP MOISTURE OVER THE AREA THIS MORNING SHOULD LOWER
RAPIDLY TONIGHT BETWEEN MIDNIGHT AND SUNRISE ON WEDNESDAY. BROKEN TO
LOCALLY SCATTERED LAYERS OF STRATOCU THIS MORNING BETWEEN 1500 AND
5000 FEET MSL SHOULD BECOME MOSTLY SCATTERED THIS AFTERNOON. SOME
FILLING IN AFTER SUNSET BUT BECOMING SCATTERED AGAIN BEFORE SUNRISE.
GUSTY WEST TO NORTHWEST WINDS ACROSS THE MOUNTAINS WILL CAUSE
MOUNTAIN WAVE AND ROTOR ACTIVITY OVER THE EASTERN DESERTS NEAR KPSP
AND KTRM THROUGH THE AFTERNOON. GUSTY WEST WINDS CAN BE EXPECTED
MOST AIRPORTS WEST OF THE MOUNTAINS THROUGH THIS AFTERNOON AS WELL.
HORTON
&&
.MARINE...
HAVE UPGRADED THE SMALL CRAFT ADVISORY FOR THE OUTER WATERS TO A
GALE WARNING AND KEPT THE SMALL CRAFT ADVISORY IN PLACE FOR THE
INNER WATERS. STRONG WEST TO NORTHWEST WINDS BEHIND THIS COLD FRONT
WILL INCREASE TO 20-30 KTS WITH GUSTS BETWEEN 35 AND 40 KNTS TODAY.
A STEEP SHORT-PERIOD 9 FT SWELL WILL CREATE HAZARDOUS SEAS THIS
AFTERNOON AND EVENING.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
HIGH WIND WARNING UNTIL 6 PM IN THE MOUNTAINS AND DESERTS...SEE
LAXNPWSGX.
WIND ADVISORY UNTIL 6 PM IN THE COASTS AND VALLEYS...SEE LAXNPWSGX.
GALE WARNING UNTIL 2 AM WEDNESDAY IN THE OUTER COASTAL WATERS...SEE
LAXMWWSGX.
SMALL CRAFT ADVISORY UNTIL 2 AM WEDNESDAY IN THE INNER COASTAL
WATERS...SEE LAXMWWSGX.
MARINE WEATHER STATEMENT UNTIL 4 PM IN THE COASTAL WATERS...SEE
LAXMWSSGX.
&&
$$
PUBLIC...MM
AVIATION/MARINE...HORTON
