Summary: The state will experience the season's first major heat wave this week and that has weather and climate experts concerned about the historic heaps of snow that are beginning to melt. Meteorologist Gerry Diaz joins host Cecilia Lei to discuss the regions that are at highest flood risk, and Chronicle lifestyle and outdoors editor Gregory Thomas shares why recreational activities in rivers are more dangerous this season. | Unlimited Chronicle access: sfchronicle.com/pod Got a tip, comment, question? Email us: fifth@sfchronicle.com Learn more about your ad choices. Visit megaphone.fm/adchoices
