ch 2 hurricanes, floods, and sinkholes n4
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CH 2 Hurricanes, Floods, and Sinkholes N4. Name Guyton Period Date. 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. - PowerPoint PPT PresentationTRANSCRIPT
CH 2 Hurricanes, Floods, and Sinkholes N4
NameGuytonPeriodDate
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
2. How does a hurricane work?
A. Warm water evaporates
B. Hot and humid air rises
C. wind from outside storm starts it turning
3. what are the main hazards?
•Wind damage•Flooding•Storm surge
4. what is STORM SURGE?• Winds “push” water from ocean or gulf onto
land
Shallow-Water Coastline
Deep-Water Coastline
Wind damage
flooding
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
6. floods are good and bad
Good:-Deposit new soil over land-recharges water table-clears debris
Bad:-destroys property-reroutes rivers
7. What is a flash flood?
flash flood
When rains from far away run downhill
Sinkholes
When flooding and rains can “open up” a cave