Natural Disasters Tornadoes, Flooding, and Avalanches.

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Presentation transcript:

Natural Disasters Tornadoes, Flooding, and Avalanches

Tornado Facts Mainly occur east of Rocky Mountains in US –Spring/summer 800 tornadoes reported nationwide Speeds up to 250 MPH; damage paths miles long

Tornadoes – What Causes Them? Develop in warm, moist air as they are met with cold fronts Creates atmospheric instability, which causes a spinning updraft

Supercell Thunderstorms Long line of thunderstorms whose updrafts/downdrafts are in perfect balance Deadly: Perfect conditions for many tornadoes

Wall Cloud Rain-free clouds that accompany tornado- producing thunderstorms

Waterspouts Tornadoes that form over water

The “F” Scale F0: Winds less than 73 MPH F1: MPH F2: MPH F3: MPH F4: MPH F5: MPH

Floods Most often, caused by overflow of rivers/lakes for a variety of reasons Farmhouses, vehicles and farmland ruined Can contaminate water

Why Live Near Water? Humans value the proximity to water Land cost is cheaper near water; easier access to transportation

Flood Control Levees/Reservoirs In emergencies, sandbags

Benefits of Flooding Egypt benefits from silt/clay deposits; soil becomes very fertile Indus/Ganges in Bangladesh Humans thrive off of rich soil for crops

Deadliest Flood China Flood, 1931 Est. deaths: 400,000-4,000,000 Left 80,000,000 homeless

Three Gorges Dam Built to help control flooding and control China’s 3 main rivers