Thunderstorms

A thunderstorm is a weather event characterized by lightning and the sound of thunder. It develops inside large cumulonimbus clouds when warm, moist air rises rapidly and meets colder air higher in the atmosphere. As the air cools, water vapor condenses into droplets and ice particles, releasing energy that strengthens the storm.

Collisions between ice crystals, hail and supercooled water create electrical charges within the cloud. When the difference in charge becomes large enough, a powerful electrical discharge occurs as lightning. Thunder is produced because the lightning heats the surrounding air to extremely high temperatures in a fraction of a second, causing the air to expand rapidly and create a shock wave that we hear as sound.

Since light travels much faster than sound, lightning is seen before thunder is heard. Thunderstorms often bring heavy rain, strong wind gusts and sometimes hail. Under certain conditions they can also produce tornadoes, especially in regions where warm and cold air masses meet. Although many storms last less than an hour, some organized storm systems can persist much longer and affect large areas.

Meteorologists monitor thunderstorms using weather radar, satellites and lightning detection networks to issue warnings and reduce risks. During a thunderstorm, the safest place is inside a sturdy building or a fully enclosed vehicle. Avoid open fields, isolated trees, bodies of water and metal objects, as lightning can strike several kilometers away from the center of the storm.