248 
FXUS66 KSGX 120535
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
930 PM PST MON FEB 11 2013

.SYNOPSIS...
CLEAR SKIES WILL PREVAIL THROUGH FRIDAY AS HIGH PRESSURE ALOFT 
BUILDS FROM THE PACIFIC INTO CALIFORNIA...AND UPPER LEVEL LOW 
PRESSURE MOVES EAST THROUGH THE ROCKIES INTO THE CENTRAL UNITED 
STATES. TEMPERATURES WILL INCREASE...BUT THERE WILL STILL BE A 
COUPLE OF COLD NIGHTS TONIGHT AND TUESDAY NIGHT...WITH FROST IN SOME 
OF THE WIND-SHELTERED VALLEYS. LOCALLY GUSTS WINDS WILL OCCUR BELOW 
PASSES AND CANYONS AT TIMES THIS WEEK...INCLUDING TONIGHT THROUGH 
TUESDAY AND AGAIN AROUND THURSDAY OR FRIDAY. A TROUGH OF LOW 
PRESSURE WILL MOVE INTO CALIFORNIA OVER THE WEEKEND AND WILL BRING 
COOLING AND A SMALL CHANCE OF PRECIPITATION MAINLY SUNDAY.

&&

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

A LINE OF SHOWERS MOVED FROM THE MOUNTAINS INTO THE VALLEYS IN 
SOUTHERN SAN DIEGO COUNTY THIS AFTERNOON...BUT SINCE SUNSET SKIES 
HAVE BEEN CLEAR. SOME AREAS WERE ALREADY QUITE COLD...WITH TEMPS 
INCLUDING 8 AT BALDWIN LAKE...13 AT BIG BEAR LAKE AND IN THE 
VALLEYS...34 AT RAMONA. THE FROST ADVISORY COVERS THE VALLEYS AS 
SOME OF THE TYPICALLY COLDER LOCATIONS WILL BE IN THE MID TO UPPER 
20S...THOUGH MOST VALLEYS WILL BE IN THE 30S...WITH MOSTLY MID 30S 
TO MID 40S ALONG THE COAST. THE MTNS WILL BE QUITE COLD DUE TO THE 
SNOW COVER...ESPECIALLY IN THE SAN BERNARDINO MOUNTAINS WHERE 
ISOLATED BELOW ZERO READINGS ARE EXPECTED TONIGHT. HOWEVER...LOCAL 
GUSTY WINDS WILL MODERATE TEMPS IN SOME AREAS...ESPECIALLY BELOW THE 
CAJON PASS WHERE LOWS MIGHT STAY ABOVE 40. THE OFFSHORE FLOW THROUGH 
TUESDAY DOES NOT LOOK TOO STRONG WITH GUST POTENTIAL NOW AROUND 40 
MPH BELOW THE CAJON PASS AND SANTA ANA MTNS...WITH A FEW HIGHER 
GUSTS IN NORTHERN PARTS OF THE COACHELLA VALLEY. MOST OF THE WIND 
WILL BE DRIVEN BY WINDS ALOFT THAN SURFACE PRESSURE GRADIENTS...WITH 
ONLY A SMALL AMOUNT OF MOUNTAIN WAVE POTENTIAL.

OTHERWISE...A GRADUAL WARMING TREND IS EXPECTED THROUGH FRIDAY AS 
TEMPS/HEIGHTS ALOFT INCREASE WITH THE RIDGING...AND OFFSHORE FLOW. 
TEMPS COULD BE IN THE 80S IN SOME VALLEY LOCATIONS BY FRIDAY. A 
SHORT WAVE MOVING THROUGH THE INTERIOR WEST COULD ENHANCE THE 
OFFSHORE FLOW THU NIGHT/FRI. THE END OF THE WARM SPELL IS EXPECTED 
EARLY NEXT WEEK AS MODELS HAVE SOME SORT OF FAST-MOVING TROUGH 
OVERRIDING THE RIDGE AND DIGGING INTO THE GREAT BASIN AND SOUTHERN 
CALIFORNIA. THIS SHOULD BRING COOLING SUNDAY/MONDAY ALONG WITH A 
SMALL CHANCE OF PRECIP...MOST LIKELY TO BE LIGHT DUE TO THE INLAND 
TRACK OF THE SYSTEM. 

&&

.AVIATION...
120300Z...THROUGH TUESDAY EVENING...CLEAR SKIES AND UNRESTRICTED 
VISIBILITY. NNE WINDS 15-25 KT AT TIMES OVER THE MTNS AND THROUGH 
THE PASSES.

&&

.MARINE...
LONG PERIOD WNW SWELL THROUGH WEDNESDAY FOR ABOVE NORMAL SURF ALONG 
EXPOSED WEST FACING BEACHES. 

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...FROST ADVISORY FROM MIDNIGHT TONIGHT TO 8 AM PST TUESDAY FOR    
     THE SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND      
     EMPIRE...SAN DIEGO COUNTY VALLEYS.

PZ...NONE.

&&

$$
PUBLIC...MAXWELL
AVIATION/MARINE...MOEDE