Back in 2006, Japanese mass media began using the term “guerrilla rainstorm” to describe short localized downpours of over 100 mm of rain per hour that appeared suddenly and unexpectedly.
The phenomenon is thought to be a result of rapid development of cumulonimbus clouds near urban areas caused by a combination of heat islands and local winds. The rainstorms have proven incredibly difficult to predict (hence the name “guerrilla”) and are known for causing flash floods in urban areas.
The photo at left is of one such guerrilla rainstorm, taken from Tokyo Skytree on Sept 1.
The photo was posted to Twitter and can best be described as Mother Nature letting it all out on downtown Tokyo.
Several other guerrilla rainstorms were reported around the country on the same day, but it seems this was the only one that was photographed.© RocketNews24