Cloudburst
Updated: Wikipedia source
A cloudburst is a large amount of precipitation in a very short period of time, sometimes accompanied by hail and thunder. Cloudbursts can dump enormous amounts of water in less than 5 minutes; for example, 25 mm of precipitation falling on one square kilometre corresponds to 25,000 metric tons of water, able to fill more than ten olympic swimming pools (1 inch corresponds to 72,300 short tons per square mile, or around 26 Olympic swimming pools). This readily generates flood conditions. However, cloudbursts are infrequent as they occur only via orographic lift or occasionally when a warm air parcel mixes with cooler air, resulting in sudden condensation. At times, a large amount of runoff from higher elevations is mistakenly conflated with a cloudburst. The term "cloudburst" arose from the notion that clouds were akin to water balloons and could burst, resulting in rapid precipitation. Though this idea has since been disproven, the term remains in use.