Above 100,000 feet altitude (20 miles).
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High-altitude burst
High-altitude Burst
Shell casing: Outer paper or plastic casing that encloses the explosive composition. Burst charge: Explosive material within the shell that propels it into the air and causes it to burst. Lift charge: Propellant at the base of the shell that launches it into the air. Fusing system: Mechanism that ignites the burst charge at the desired altitude.
A radiosonde observation typically doesn't extend above 100000 feet in altitude because the air pressure is very low at high altitudes, causing the radiosonde balloon to expand and eventually burst. Additionally, the instruments on board may not be able to function properly under extreme conditions.
Cloud Burst - 2012 Watching the Clouds Burst 1-1 was released on: USA: 2013