( CNN ) -- Two lightning-triggered wildfires that have charred 24,000 acres in drought-stricken West Texas threaten 150 homes and 250 other buildings , officials said Wednesday . `` We 're going to do everything we humanly , safely can do to protect those homes and residents , '' Incident Commander Tony Wilder said . Jeff Davis County officials ordered voluntary evacuations , but residents have not left some neighborhoods , Texas Forest Service spokeswoman April Saginor said . About 250 firefighters , including `` hot shot teams '' from Arizona , Nevada and Georgia , are on the scene to battle the two blazes in steep , rugged terrain , Saginor said . The leading edge of the Livermore fire , which has burned 13,387 acres since last week , is within a mile of the Davis Mountain Resort community , fire officials said in a statement Wednesday . The fire is about 30 % contained , it said . `` Winds associated with afternoon thunderstorm activity are making the firelines difficult to hold , '' the statement said . The Spring Mountain fire , which is 60 % contained , has burned 10,576 acres northwest of Fort Davis since starting April 24 , it said . `` We 've had about one-fourth of the moisture that we normally get , '' fire volunteer Kelly Bryan said . CNN 's Dave Alsup contributed to this report .
NEW : Winds making the homes difficult to hold , officials say . NO : In order ` ` do everything we humanly , safely can '' to protect the homes . Some residents remain at threatened homes despite the order . 250 firefighters , including those from Arizona , Nevada and Georgia , are on the scene .