Just over 600 people were still without power mid-morning Tuesday after a mighty thunderstorm downed power lines and trees across southern Maine Monday night. That was down from the more than 1,000 Central Maine Power Co. customers without electricity at 8 a.m., most of whom resided in Cumberland and York counties, where the stormed rolled through as the sun set Monday. The storm caused severe damage to utility poles and property in the southern counties, causing some roads to shut down as crews cleared them of felled trees and dangerous live wires, according to CBS affiliate WGME. In the York County town of Buxton, as many as 10 roads were closed Monday night, the staton reported.