Gridley, California

... 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. For additional health tips on dealing with
the smoke... please visit http://www.Oes.CA.Gov/heatwave... or contact
your local County air quality district for further details.