FXUS66 KSTO 290554
AFDSTO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
955 PM PST SAT NOV 28 2009

.DISCUSSION...WATER VAPOR IMAGERY SHOWS HIGH PRESSURE NUDGING INTO 
NORTHERN CALIFORNIA THIS EVENING...AS THE UPPER LEVEL LOW CONTINUES 
TO DIG OVER SOUTHERN CALIFORNIA AND ARIZONA.  THIS IS CAUSING OUR 
NORTHERLY GRADIENT TO WEAKEN...AS THE REDDING TO SACRAMENTO 
GRADIENT IS DOWN TO 5.0 MBS FROM AN EARLIER HIGH POINT OF 7.9 MBS.  
AS A RESULT...THE WINDS HAVE SIGNIFICANTLY DECREASED ACROSS THE 
REGION.  THE ONE EXCEPTION TO THIS IS THE WESTERN FRINGES OF THE 
VALLEY...WHERE SUISUN AND VACAVILLE CONTINUE TO SEE SOME HIGHER 
GUSTS AT TIMES.  THESE WINDS WILL CONTINUE TO DECREASE THROUGH THE 
OVERNIGHT HOURS AND INTO TOMORROW...AS THIS GRADIENT TRANSITIONS TO 
A MORE NORTHEASTERLY AND EASTERLY GRADIENT.  THE WEST SLOPES OF THE 
SIERRA...WESTERN PLUMAS...AND THE NORTHEAST FOOTHILLS WILL CONTINUE 
TO SEE SOME GUSTY WINDS THROUGH THE NIGHT AND EARLY MORNING HOURS.  
OTHERWISE...EXPECT DRY AND CLEAR CONDITIONS TO THE PREVAIL TONIGHT 
AND TOMORROW.  TEMPERATURES TONIGHT WILL ON THE CHILLY SIDE ONCE 
AGAIN.  AS FOR TOMORROW...850 TEMPERATURES WILL WARM 5 TO 6 
DEGREES...WHICH MEANS THAT THE MOUNTAINS WILL SEE SOME DECENT 
WARMING.  IN THE VALLEY THOUGH...EXPECT TEMPERATURES TO BE SIMILAR 
TO OR SLIGHT COOLER TOMORROW...AS LESS WINDS AND A COOLER MORNING 
START WILL MOST LIKELY MAKE THE DIFFERENCE.  CURRENT FORECAST LOOKS 
ON TRACK...AND NO UPDATES ARE PLANNED AT THIS TIME.  PALMER

&&

.AVIATION...VFR CONDITIONS ACROSS THE AREA OVER THE NEXT 24 HOURS. 
NORTH WINDS ARE SUBSIDING WITH SOME LOCAL GUSTS TO AROUND 20-25 KT 
IN SOME VALLEY LOCATIONS THROUGH THE REST OF THE EVENING. MOUNTAIN 
GUSTS TO 40-60 KT POSSIBLE OVER HIGHER TERRAIN AND THROUGH CANYONS 
TONIGHT INTO SUNDAY MORNING.

&& 

.STO WATCHES/WARNINGS/ADVISORIES...
...WIND ADVISORY UNTIL 10 AM PST SUNDAY FOR WEST SLOPE NORTHERN    
   SIERRA NEVADA-WESTERN PLUMAS COUNTY/LASSEN PARK-NORTHEAST    
   FOOTHILLS/SACRAMENTO VALLEY.

&&

$$