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. When a vehicle stalls in the water, the water's momentum is transferred to the car.
For each foot the water rises, lbs. Average range is 40 miles, depending on topography. Your National Weather Service recommends purchasing a radio that has both a battery backup and a tone-alert feature which automatically alerts you when a watch or warning is issued. Families should be prepared for all hazards that affect their area. Where will your family be when disaster strikes? They could be anywhere at work, at school, or in the car. How will you find each other?
Will you know if your children are safe? Disasters may force you to evacuate your neighborhood or confine you to your home.
What would you do if basic services water, gas, electricity or telephones were cut off? Follow these basic steps to develop a family disaster plan Practice and maintain your plan. Ask questions to make sure your family remembers meeting places, phone numbers, and safety rules. Conduct drills. Test your smoke detectors monthly and change the batteries at least once a year. Test and recharge your fire extinguisher s according to manufacturer's instructions.
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What is a flash flood? What causes flash floods? Where are flash floods most likely to occur? Wonder What's Next? What happens if a horse gets the chicken pox? Find out tomorrow in Wonderopolis! Try It Out Are you ready to study the weather in greater detail? Ask a friend or family member to help you check out the following activities: Have you ever had a flash flood in the area where you live? Talk with friends and family members who have lived in your area for a long time.
What's the worst flooding they've seen? Which areas nearby tend to flood most quickly? Are there streams or rivers nearby that are prone to flooding? What's the weather going to be like over the next week or so? Check the forecast by watching a television newscast or checking your local weather online. Is there rain in the forecast? Find a day coming up soon when it's supposed to rain. Make plans with an adult friend or family member to go for a drive after the next big rain your area gets.
Check for evidence of flooding near local streams, rivers, or other waterways. What is the topography like around your house? Do you live high on a hill? Perhaps you live in a valley? If the nearest large body of water were to overflow, would your home be in danger of flooding?
If you have a basement, talk with your friends and family members about how to keep your basement dry even during the rainy season. Did you get it? Test your knowledge. What are you wondering? Wonder Words rapid react thrive angry urban doubt flourish worried provide grateful replenish potential constant canceled overtaken dangerous threatened precipitation Take the Wonder Word Challenge.
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