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SHASTA LAKE AREA / NORTHERN SHASTA COUNTY-
BURNEY BASIN / EASTERN SHASTA COUNTY-NORTHERN SACRAMENTO VALLEY-
CENTRAL SACRAMENTO VALLEY-SOUTHERN SACRAMENTO VALLEY-
MOUNTAINS SOUTHWESTERN SHASTA COUNTY TO NORTHERN LAKE COUNTY-
NORTHEAST FOOTHILLS/SACRAMENTO VALLEY-
400 AM PDT FRI JUL 25 2008

...AREAS OF THICK SMOKE WILL CONTINUE OVER PARTS OF INTERIOR 
NORTHERN CALIFORNIA TODAY AND TONIGHT...

THICK SMOKE WILL CONTINUE TO PLAGUE PORTIONS OF THE NORTHERN AND CENTRAL 
SACRAMENTO VALLEY TODAY AND TONIGHT. MOST OF THE SMOKE IS COMING 
FROM FIRES IN TRINITY COUNTY. VISIBILITY MAY DROP BELOW TWO MILES AT 
TIMES OVER PORTIONS OF 
SHASTA...TEHAMA...GLENN...BUTTE...SUTTER...YUBA...COLUSA AND LAKE 
COUNTIES. 

A MODERATE DELTA BREEZE WILL ALLOW FOR BETTER VISIBILITY AND AIR 
QUALITY IN THE SOUTHERN SACRAMENTO VALLEY TODAY. LIGHT NORTH WINDS MAY 
INCREASE TONIGHT AS SURFACE HIGH PRESSURE BUILDS INTO SOUTHERN 
OREGON. THIS COULD SPREAD SMOKE FARTHER SOUTH TOWARD THE SACRAMENTO 
AREA. THICKER SMOKE IS EXPECTED TO REMAIN CONFINED TO AREAS FARTHER 
NORTH...BUT SOME DETERIORATION IN AIR QUALITY MAY AFFECT THE 
SACRAMENTO AREA TONIGHT.   

STRONGER UPVALLEY WINDS WILL DEVELOP DURING THE DAY SATURDAY...AND  
STRONGER SOUTHWEST WINDS ALOFT WILL CARRY SMOKE HIGHER INTO THE 
ATMOSPHERE. THIS SHOULD RESULT IN IMPROVED VISIBILITY AND BETTER AIR 
QUALITY FOR MOST AREAS SATURDAY AND SUNDAY.  

SMOKY CONDITIONS WILL RESULT IN AREAS OF POOR AIR QUALITY TODAY AND 
TONIGHT. PEOPLE ARE ADVISED TO LIMIT OUTDOOR ACTIVITIES AND 
PROLONGED EXPOSURE TO THE SMOKY AIR...ESPECIALLY THOSE WITH 
RESPIRATORY CONDITIONS.