The balloon pilot conducted multiple sport parachute flights throughout the day without obtaining a weather briefing. A SIGMET for severe thunderstorms, hail, and cloud tops to 45,000 feet was in effect for the area surrounding the takeoff and accident sites. Shortly after the balloon lifted off on the accident flight, the ground crew was advised of a severe storm warning for the area and observed the storm on radar via their cellular telephones.

Read the NTSB report…