So, if the rain is falling too fast for the ground or drains to cope, there is a risk of flash flooding. Most rivers flow fairly gently as they slope slowly towards the sea. Therefore, when a river floods it does so quite slowly as it takes time for the rain to percolate through the ground and into the rivers and out to sea, allowing time for some warning.
With flash flooding, there is often very little time between the rain falling and flash flooding occurring. Subsequent flash flooding can occur downstream if the obstruction should suddenly release. Identify where to go if told to evacuate. Choose several places Know your area's flood risk. For information, call your local National Weather Service office, Red Cross chapter, or local emergency management agency.
Check your homeowner's or renter's insurance. Homeowners' policies do not cover flooding. Contact your insurance agent to find out how to get flood insurance. Even 6 inches of fast-moving flood water can knock you off your feet, and a depth of 2 feet will float your car! NEVER try to walk, swim, or drive through such swift water. If you come upon flood waters, STOP! Winds generated from tropical storms and hurricanes or intense offshore low pressure systems can drive ocean water inland and cause significant flooding.
Escape routes can be cut off and blocked by high water. These waves are produced by earthquakes or volcanic activity. As land is converted from fields or woodlands to roads and parking lots, it loses its ability to absorb rainfall. Urbanization increases runoff 2 to 6 times over what would occur on natural terrain. During periods of urban flooding, streets can become swift moving rivers, while basements can become death traps as they fill with water.
An arroyo is a water-carved gully or norma lly dry creek bed. Arroyos can fill with fast-moving water very quickly. Flash flooding at this arroyo in Arizona took only 58 seconds to develop.
Floating ice can accumulate at a natural or man-made obstruction and stop the flow of water. Current Hazards. Rivers and Lakes. Climate and Past Weather. Flash Flooding is possible everywhere. The normally tranquil streams and creeks in your neighborhood or area can become raging torrents if heavy rain falls overhead -- or even upstream of your location! Flash Flooding can also occur on city streets and highway underpasses. Current Weather. Forecast Maps. Hour by Hour Forecast. Winter Weather.
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