This morning I spoke with a representative at Arizona Forestry and Fire Management-Tucson Office and he reports that the Westridge Fire perimeter is about 500 acres in Cochie Canyon and was caused by a lightning strike. There were no open flames overnight. This fire is under control and they will continue to monitor over the next few days.
This fire is not yet showing up on the InciWeb Website but will may be on the website tomorrow. If you have a Twitter account, you can follow the fire status at @azstateforestry and search for # WestridgeFire to get updates.
TA will keep you informed as new information becomes available.