 Tonight, showers, possibly a thunderstorm, some locally heavy downpours, mild and muggy in the 60s, and Sunday, clouds, some breaks of sun, warm and humid, scattered showers and thunderstorms, a few could be strong, mid-70s to mid-80s. I'm meteorologist Mark Breen with an eye on the sky. From NPR, this is Hidden Brain, I'm Shankar Vedanta.