This year’s heat death toll for Southern Nevada rose to 46 on Thursday, a day after the Clark County coroner’s office released a spreadsheet that listed 29 heat-related deaths. The updated number comes as Las Vegas braces for 110-degree highs through next week and the county extended its cooling station activation until Wednesday. The coroner’s office broadened its criteria in 2021 for determining when heat should be considered during a death investigation, and temperatures above 95 degrees are generally when investigators will consider heat illness. It’s widely believed that even the most inclusive standard leaves out deaths from official counts.