...HIGH WIND WARNING IN EFFECT FROM 8 AM TO 8 PM EDT THURSDAY... * WHAT...Southeast winds 20 to 40 mph with gusts up to 60 mph expected. Isolated gusts up to 70 mph are possible. * WHERE...Portions of east Tennessee. * WHEN...From 8 AM to 8 PM EDT Thursday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles.