CASPER, Wyo. — Triple-digit heat, elevated fire danger, and intermittent storm chances are set to grip Casper and Natrona County through the weekend, according to forecasters with the National Weather Service in Riverton. A high-pressure ridge firmly anchored over the Four Corners region is driving the heat wave across the state, bringing what meteorologists expect to be the hottest stretch of the upcoming week. For Casper, Saturday brings mostl…