TUCSON, Ariz. – Hundreds of foothills homes on the outskirts of Tucson remained under an evacuation notice Friday as firefighters worked to keep a wildfire from moving downhill from canyons and ridges in mountains in a national forest.Most of the western United States is experiencing extreme dryness or drought, creating challenging conditions for wildfire season, Bryan Henry, meteorologist with the National Interagency Fire Center, said in a recent fire season outlook.The Federal Emergency Management Agency granted Arizona’s request for money to help fight the fire, officials said Thursday.Fire officials said the fire’s growth slowed overnight but that it remained a threat.