NEW : Heat exhaustion kills man in Kentucky . The longer the heat wave lasts , the greater the dangers , meteorologist says . passed away from heat exhaustion , a local coroner 's office said Thursday . Severe storms are expected Saturday in the Northeast , Friday in the Northeast . Heat indexes are expected to hit 658 in some cities Saturday .
NEW : Heat exhaustion kills man in Kentucky . The longer the heat wave lasts , the greater the dangers , meteorologist says . Severe storms are expected Saturday in the Northeast , Friday in the Northeast . Heat indexes are expected to hit 658 in some cities Saturday .