Again, periods of intense rainfall in short time frames can produce a flash flood. Land topography plays a critical role. Urban areas are prone to this event because paved streets, underpasses, roofs, and parking lots act as man-made streams. Water will take the path of least resistance. Mountainous areas can also create fast moving currents because of natural canyons and slopes. The often lethal aspect of a flash flood is that the flood wave may have originated miles away from the storm front.

Rivers that are totally or partially frozen can break apart as a water levels rise. This can create ice flows that can obstruct normal flow as they become lodged on bridge piers, log jams, etc. The resulting impediment can cause water to rapidly rise upstream behind this natural dam. Not only is there a threat from water damage, destruction produced from the ice chunks is possible. Hypothermia is also a hazard that must be taken seriously.


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