boosters this week? hurricane lee just forming in the atlantic will it impact the u.s. al roker is here with the latest track the dangerous september heat wave breaking records from the south to the northeast. schools forced to make tough choices. the video of a russian missile strike on a ukraine market happening just as secretary of state tony blinken made a surprise visit to kyiv. and the young americans shining at the u.s. open. they ve already made history. can they win it all? announcer: this is nbc nightly news with lester holt good evening, and welcome, everyone. how did a convicted killer simply walk free from a pennsylvania prison? apparently horizontally that s what just released security video of danelo cavalcante s escape a week ago appears to show the five-foot, 120-pound inmate suspended face down between two walls quickly walking himself to the roof of the chester county prison where he made his getaway, unseen by a guard in a nearby tower. a vul