NEW : Tornado watch in effect for parts of northwestern Mississippi . Hall said the storm moved north across the city to the Mall at Barnes Crossing . Law enforcement official reports tornado damage in Tupelo , Mississippi . Storm damages trees , power lines , and 18-wheeler on Interstate 20 . No injuries reported in Mississippi town .
NEW : Tornado watch in effect for parts of northwestern Mississippi . Law enforcement official reports tornado damage in Tupelo , Mississippi . Storm damages trees , power lines , and 18-wheeler on Interstate 20 . No injuries reported in Mississippi town .