In Malaysia, thunderstorms are a common phenomenon occurring all year round, frequently during the afternoon and early evening. Despite their small size, all thunderstorms are dangerous.
Every thunderstorm produces lightning which has the potential to kill people.
Heavy rain from thunderstorms can lead to flash flooding and landslides. Strong winds and hail are also dangers associated with some thunderstorms. A thunderstorm usually develops in an unstable and moist atmosphere. A cumulus cloud is formed when warm moist air from the surface rises and is lifted to higher altitude and condenses. It grows laterally and vertically into a large dense cloud called cumulonimbus, with strong turbulence within the cloud and strong outflow below the base of the cloud.