WASHINGTON, April 5 -- The U.S. Department of Commerce's National Oceanic and Atmospheric Administration issued the following news release: This summer, NOAA and citizen scientists will map the hottest parts of 18 communities in 14 states across the country and in one international city. Identifying these hotspots, called urban heat islands, helps local decision-makers take actions to reduce the health impacts of extreme heat, which often target the most vulnerable. Now in its seventh year, th  more