How does a thunderstorm occur?

Accumulation of moisture in the atmosphere causes a thunderstorm. This accursed mostly in summer when the sun is hot and keeps soaking up water from the ground and water bodies. The most air rises and form small clouds that pile up gradually to from huge cauliflower shaped clouds as high as 10Km.lnside the clouds, large water drops and ice crystal from due to extreme cold conditions. 

these remain afloat, being supported by powerful winds. When they collide and rub against one another, an electrical voltage is produced between the upper and lower layers of clouds. This voltage, one sufficiently high, is discharged in the form of lightning.