State of Drought 3: Are We in a Megadrought?

We've been flirting with exceptional drought on and off in California for many years now. Bay Curious listener Nicholas Hardy is wondering if it's time to call it a megadrought. That got us wondering: what is a megadrought and are we in one?

Additional Reading:

• Is California In A Megadrought? (Transcript)
• Megadrought Conditions Not Seen For 400+ Years Have Returned to the West, Scientists Say

Reported by Amy Mayer. Bay Curious is made by Olivia Allen-Price, Katrina Schwartz, Kevin Stark, Katie McMurran and Brendan Willard. Additional support from Erika Aguilar, Jessica Placzek, Kyana Moghadam, Isabeth Mendoza, Paul Lancour, Suzie Racho, Carly Severn, Ethan Lindsey, Vinnee Tong and Jenny Pritchett.