Thunderstorms often occur at the turn of spring and summer or on hot summer days. When the stratification in the atmosphere is unstable, strong convection is easy to occur. When the potential difference between the clouds and the clouds and the ground reaches a certain level, discharge will occur. Sometimes thunder Loud and dazzling lightnings cut through the sky, often accompanied by strong winds, gusts of rain or hail. Thunderstorms are always associated with the development of strong cumulonimbus clouds. In weather forecasting, people often say that strong convection weather such as thunderstorms and winds refers to thunderstorms accompanied by strong winds or hail.