Some of the country’s most beloved national parks – including many across the West – could see substantial jumps in the number of extremely hot days in coming decades, according to a new report. The nonprofit Climate Central analyzed data from the National Park Service and found that by 2050, the 25 most visited parks are likely to have five times as many extremely hot days – compared to recent decades. Climate Central defines extreme heat as a high temperature above the 99th percentile for the roughly three decade period between 1979 and 2012. For example, Utah’s Zion National Park...