evidence: A record-breaking heat wave is sending temperatures soaring to dangerous levels in the Northeast and Midwest, but much of the US is suffering through sweltering heat. [...] Hundreds of records could be tied or broken this week. Multiple all-time June high temperature records could fall as the heat rises to levels normally seen only on the hottest July days. Parts of the Midwest to the Northeast could endure the longest heat wave they’ve seen in decades, the National Weather Service’s Weather Prediction Center said. [...] Temperatures soared 15 to 20 degrees above normal Monday afternoon and remained at elevated levels overnight. A few dozen temperature records fell as a result, including daily record highs in Chicago and Cleveland, and daily record warm low temperatures in places like Des Moines, Iowa. Temperatures will rise up to 25 degrees above normal through the rest of the workweek.