guy,
  Here is a current Special Weather Statement for Sun Valley, CA (Sun Valley, CA) until 6:00am, Sun Nov 20 2011, from your local National Weather Service office. 
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 SPECIAL WEATHER STATEMENT
 NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
 653 PM PST SAT NOV 19 2011
 SAN LUIS OBISPO COUNTY CENTRAL COAST-
 SANTA BARBARA COUNTY CENTRAL COAST-SANTA YNEZ VALLEY-
 SAN LUIS OBISPO COUNTY INTERIOR VALLEYS-CUYAMA VALLEY-
 SANTA BARBARA COUNTY SOUTH COAST-VENTURA COUNTY COAST-
 LOS ANGELES COUNTY COAST INCLUDING DOWNTOWN LOS ANGELES-
 VENTURA COUNTY INTERIOR VALLEYS-VENTURA COUNTY COASTAL VALLEYS-
 SANTA MONICA MOUNTAINS RECREATIONAL AREA-
 SAN LUIS OBISPO COUNTY MOUNTAINS-SANTA BARBARA COUNTY MOUNTAINS-
 VENTURA COUNTY MOUNTAINS-
 LOS ANGELES COUNTY MOUNTAINS EXCLUDING THE SANTA MONICA RANGE-
 ANTELOPE VALLEY-CATALINA ISLAND-SANTA CLARITA VALLEY-
 LOS ANGELES COUNTY SAN FERNANDO VALLEY-
 LOS ANGELES COUNTY SAN GABRIEL VALLEY-
 653 PM PST SAT NOV 19 2011 
 ...A STORM SYSTEM WILL AFFECT SOUTHWESTERN CALIFORNIA WITH RAIN AND 
 MOUNTAIN SNOW ON SUNDAY... 
 AN UPPER LEVEL LOW PRESSURE SYSTEM OFF THE NORTHERN CALIFORNIA COAST 
 THIS EVENING IS FORECAST TO DROP SOUTHWARD TONIGHT...THEN PUSH 
 ACROSS SOUTHWESTERN CALIFORNIA SUNDAY INTO SUNDAY EVENING. AMPLE 
 SOUTHERLY FLOW WELL AHEAD OF AN ASSOCIATED COLD FRONT WILL BRING A 
 SLIGHT CHANCE OF SHOWERS TO MANY AREAS TONIGHT. MODERATE RAIN WITH 
 THE MAIN FRONT IS EXPECTED TO DEVELOP ACROSS THE CENTRAL COAST BY 
 EARLY SUNDAY MORNING...THEN SPREAD QUICKLY SOUTHEASTWARD...REACHING 
 THE LOS ANGELES BASIN BY EARLY SUNDAY AFTERNOON. IT APPEARS THAT 
 THERE WILL BE A 4 TO 6 HOUR PERIOD OF STEADY RAIN WITH THIS FRONTAL 
 SYSTEM...FOLLOWED BY SCATTERED SHOWERS. 
 ALONG AND AHEAD OF THIS FRONT...THERE WILL BE A PERIOD OF GUSTY 
 SOUTH WINDS...ESPECIALLY IN THE MOUNTAINS...AND ACROSS SAN LUIS 
 OBISPO AND SANTA BARBARA COUNTIES. DURING THE HEIGHT OF THE 
 STORM...RAIN MAY BE BRIEFLY HEAVY AT TIMES...ESPECIALLY NEAR ANY 
 THUNDERSTORMS THAT DEVELOP...SOME OF WHICH COULD PRODUCE SMALL HAIL. 
 SHOWERS WILL END ACROSS THE REGION BY EARLY MONDAY MORNING.  
 RAINFALL AMOUNTS ARE GENERALLY EXPECTED TO RANGE BETWEEN 0.50 AND 
 1.00 INCH IN MOST AREAS. LOCAL AMOUNTS TO AROUND 1.50 INCHES CAN BE 
 EXPECTED OVER THE FAVORED HILLS OF THE SANTA LUCIA RANGE...AS WELL 
 AS THE SANTA MONICA MOUNTAINS AND NEAR THE SANTA BARBARA/VENTURA 
 COUNTY LINE.  
 IN THE MOUNTAINS...SNOW LEVELS ARE EXPECTED TO BE NEAR 5500 FEET 
 WITH THE BULK OF THE PRECIPITATION...BUT COULD LOWER TO 4000 TO 4500 
 FEET ON INTERIOR SLOPES WITH ANY STRAY SHOWERS BEHIND THE FRONT. 
 SNOW TOTALS ARE EXPECTED TO RANGE BETWEEN 3 AND 6 INCHES ABOVE 5500 
 FEET...BUT COULD BE SLIGHTLY HIGHER IF THE FRONT SLOWS DOWN MORE 
 THAN EXPECTED...IN WHICH CASE A WINTER WEATHER ADVISORY MAY BE 
 NEEDED. SNOW COULD IMPACT TRAVEL ON PORTIONS OF THE ANTELOPE VALLEY 
 FOOTHILLS AND INTERSTATE 5 NEAR THE GRAPEVINE SUNDAY NIGHT. 
 THERE WILL BE ANOTHER CHANCE OF RAIN ACROSS THE REGION LATE 
 WEDNESDAY NIGHT INTO THANKSGIVING.  
 IF YOU ARE PLANNING TRAVEL OVER THE WEEKEND...ESPECIALLY INTO THE 
 MOUNTAINS...STAY TUNED FOR LATER FORECAST AND CHECK THE LATEST ROAD 
 REPORTS. 
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