Flight Data and Weather Conditions
Air traffic control radio recordings captured the final moments of the flight. Minutes before the crash, the crew reported encountering "light, clear ice that is manageable and moderate turbulence," according to NTSB member Tom Chapman. The crew also reported an outside temperature of -47 degrees Celsius (-53 degrees Fahrenheit) and requested to climb from 35,000 feet to 37,000 feet to find clearer air.
Shortly after the request to climb was granted, the aircraft entered an overspeed condition. Radio transmissions captured the crew stating, "We’re descending 10,000 feet per minute" and later, "We’re going to crash into the ground!"
According to the FOX Forecast Center, the plane likely flew through a developing thunderstorm that moved in from the southeast approximately five minutes before the crash. The FOX Forecast Center noted the estimated cloud height of the storm was around 44,000 feet, which is approximately 7,000 feet higher than the plane's altitude at the time.