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CH 2 Hurricanes, Floods, and Sinkholes N4
NameGuytonPeriodDate
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1. What is a hurricane?
• an intense, rotating oceanic weather system that possesses maximum sustained winds exceeding 74 mph.
• A spinning storm over the ocean with winds of 74 mph or more
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2. How does a hurricane work?
A. Warm water evaporates
B. Hot and humid air rises
C. wind from outside storm starts it turning
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3. what are the main hazards?
•Wind damage•Flooding•Storm surge
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4. what is STORM SURGE?• Winds “push” water from ocean or gulf onto
land
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Shallow-Water Coastline
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Deep-Water Coastline
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Wind damage
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flooding
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Category Winds (MPH) Pressure (Inches)
Storm Surge(Feet) Damage
1 74-95 <28.94 4'-5' Minimal
2 96-110 28.91-28.50 6'-8' Moderate
3 111-130 28.47-27.91 9'-12' Extensive
4 131-155 27.88-27.17 13'-18' Extreme
5 >155 <27.17 >18' Catastrophic
5. How are hurricanes measured? • The Saffir-Simpson Hurricane Scale
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6. floods are good and bad
Good:-Deposit new soil over land-recharges water table-clears debris
Bad:-destroys property-reroutes rivers
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7. What is a flash flood?
flash flood
When rains from far away run downhill
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Sinkholes
When flooding and rains can “open up” a cave
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