* AFFECTED AREA...Fire Weather Zones 211 and 213. * TIMING...From noon to 7 PM MDT Wednesday. * WINDS...West 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire.