Tokyo Is Testing a New System to Detect 'Guerrilla' Rain and Tornadoes Up to 30 Minutes in Advance

With almost one third of Tokyo lying below sea level, predicting sudden, torrential rainfall is a major priority for Japanese officials.

from gizmodo http://www.gizmodo.co.uk/2019/02/tokyo-is-testing-a-new-system-to-detect-guerrilla-rain-and-tornadoes-up-to-30-minutes-in-advance/