California fire officials say weather conditions have improved and that authorities hope to begin containing a big wildfire in Sonoma County's wine country by nightfall.Fire personnel on the ground and planes in the air are fighting the blaze.The Sonoma County fire broke out late Wednesday and exploded to more than 15 square miles (39 square kilometers) due to extremely windy and dry weather affecting the state. California Department of Forestry and Fire Protection makes a statement on the current situation.