Flood Styles
Killer floods are unleashed by several phenomena:
1) A local thundercloud can form and unleash a flash flood in just
a few hours
2) Abundant rainfall lasting for days can cause regional floods that
last for weeks
3) The storm surges of tropical cyclones flood the coasts
4) The breakup of winter ice on rivers can pile up and temporarily
block the water flow, and then fail in an ice-jam flood
5) Hot weather an cause rapid melting of snow
6) Short-lived natural dams made by landslides or log jams fail
and unleash floods
7) Human-built dams and levees fail, causing voluminous floods