Extreme heat bakes Midwest, parts of East Coast

Saturday, July 7, 2012 | 5:54 p.m. CDT; updated 6:43 p.m. CDT, Saturday, July 7, 2012

PHILADELPHIA — The hot weather gripping much of the country only worsened Saturday as highways buckled, the waters of Lake Michigan were unusually warm for this time of year, and even a minor train derailment outside Washington was blamed on heat.