The National Weather Service in Phoenix has issued a Fire Weather Watch for strong winds, low relative humidity and very high fire danger, which is in effect from Friday morning through Saturday evening. * AFFECTED AREA...Southern Gila County/Tonto National Forest Foothills. * TIMING... * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 11 percent. * IMPACTS...Rapid spread and growth of any new or existing fires. Fires will have the potential to exhibit extreme fire behavior. Elevated potential for new fire starts.