A historic heat wave continues to affect the Southwest and Plains regions of the United States, breaking temperature records in numerous cities. Nearly 180 cities from California to the East Coast have reported unprecedented heat, with no immediate relief in sight. Cities like Phoenix are experiencing triple-digit temperatures, and parts of Texas and Oklahoma are expected to reach 100°F (38°C). The heat wave has already set new March temperature records in Nevada, Colorado, and Nebraska, marking it as one of the most significant March heat waves since 2012. Temperatures have soared as high as 45 degrees above average.