Las Vegas is currently facing an unprecedented heat wave for March, with temperatures expected to reach 100°F (38°C), marking a historical high for this time of year. This event is part of a larger issue affecting the Colorado River Basin, predicted to have its third-worst runoff season ever. The early snowmelt is causing concerns about water availability, prompting the National Weather Service to issue heat advisories, urging residents and visitors to protect themselves from the extreme conditions.