NASHVILLE, Tenn. (AP) — Earlier storms that raked Tennessee are likely to be a mere a preview of severe weather this week. After overnight storms, several school systems canceled classes for Tuesday because school buildings were without electricity and some bus routes had downed trees along them. By early Tuesday, the power distributor in Clarksville still had about 33,000 customers without electricity and the Knoxville Utilities Board reported more than 11,000 customers without power.