 A slight chance for some rain showers and thunderstorms this evening in Las Vegas. High temperatures near 109 degrees. Overnight lows around 87. The Las Vegas Valley is under an excessive heat warning, taking effect tomorrow morning and lasting through Sunday night. We've got more All Things Considered ahead on Nevada Public Radio. Coming up, a conversation with the author-director of Twisters. That story's next on KNPR and KNPR.org.