Word of the day, 13 April 2025: 'Cloudburst'

Word of the day: CLOUDBURST
Pronunciation
cloud·​burst  /ˈklaʊd.bɜːst/

Meaning

A cloudburst is sudden, intense rainfall that can lead to flash floods. It is characterised by a very high amount of precipitation in a short period, often occurring in hilly or mountainous regions. Unlike normal rain, a cloudburst happens when a large amount of moisture in the atmosphere rapidly condenses and falls as heavy rain, sometimes accompanied by hail, thunder, and strong winds.

Origin

The word "cloudburst" originates from American English in the early 19th century, modelled after the German word "Wolkenbruch" (meaning "cloud break"). It describes a sudden, very heavy rainfall.

Scientific explanation and meteorological history: Cloudbursts are caused by orographic lift (when moist air rises over mountains) or thermal convection (when heated air rises rapidly, forming thunderstorms).

Most cloudbursts occur when warm air carrying a high amount of moisture collides with cooler air at high altitudes, leading to rapid condensation and intense rainfall. These events are most common in mountainous regions like the Himalayas, Western Ghats (India), and the Rockies (USA) because the terrain forces moist air to rise quickly, causing sudden rainfall.

Examples from books and articles

He found that the more people killed in a war, the less likely it was to occur and the longer before you could witness it, just as violent storms occur less frequently than cloudbursts - Cosmos by Carl Sagan

The storm turned out to be a cloudburst, and an island where we were going to spend the night was flooded - On the Far Side of the Mountain by Jean Craighead George

Synonyms

• Downpour
• Torrential rain
• Heavy shower
• Rainstorm
• Deluge
• Sudden rain
• Squall