Estimated Record-Breaking Heat Wave Sweeping The U.S.

An unbearable heat wave is blazing across the country tonight and records are expected to be broken. Nearly 200 million people are experiencing highs today above 90 degrees and 40 million are in areas with triple-digit temperatures. Parts of California, the Central Plains and Texas have highs ranging from 105 to 113 degrees. Children and the elderly are particularly vulnerable to heat-related illness. » Subscribe to NBC News: » Watch more NBC video: NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features , , , Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows. Connect with NBC News Online! NBC News App: ht