Severe Weather

Flash floods occur when rainfall or snowmelt ​ (a)   the lands infiltration rate and/or the carrying ​ (b)   of a river.

Flash floods can occur in desert landscapes, valleys, coastal areas, and flood plains along rivers.  

​ (c)   kill more people than any other disaster.

• exceeds
• capacity
• Floods

​ (a)   Characterized by:  Dark ​ (b)   clouds that produce heavy rain, sounds of thunder, flashes of lightning, strong winds, and sometimes ​ (c)   .

• Thunderstorms
• cumulonimbus
• hail

Thunderstorms form along ​ (a)   because air is forced to rise and ahead of fronts called ​ (b)   lines.  ​ (c)   are large single-cell thunderstorms with extremely strong updrafts, the ​ (d)   rotate to form tornadoes.

• fronts
• squall
• Supercells
• updrafts

Match the following

• A front where thunderstorms form

• Squall line

• Produce heavy rain, lightning and sometimes tornadoes

• Flashfloods

• Kill more people than any other natural disaster

• Supercell

• large single-cell thunderstorms with extremely strong updrafts

• Cumulonimbus clouds

A tornado is a violently rotating column of air that forms from a ​ (a)   , when it touches the ground it becomes a ​ (b)   .  Air pressure on the center of a tornado is very ​ (c)   and air is sucked into the funnel cloud.

• mesocyclone
• tornado
• low

Three major types of air are colliding in an area known as Tornado ​ (a)  

Cold dry air from the ​ (b)   region

Warm dry air from the ​ (c)  

Warm humid air from the ​ (d)   of Mexico​

• alley
• polar
• desert
• gulf

Match the following that cause Tornado Alley

• Warm dry air

• Desert

• Cold dry air

• Polar region

• Warm humid air

• Gulf of Mexico

Match the following

• 156-260mph

• F5

• 261-318mph

• F2

• 113-157mph

• F1

• 207-260mph

• F3

• 40-77mph

• F4

A hurricane starts out as a ​ (a)   storm.  It begins to gain strength from ​ (b)   ocean water, which evaporates and then ​ (c)   to make storm clouds.  Winds help push warm, moist air ​ (d)   and help the hurricane get bigger as it rotates and moves.

• tropical
• warm
• condenses
• upwards

Match the following

• A hurricane in the South Pacific

• Saffir-Simpson Scale,

• Howa hurricanes strength is measured based in wind speeds, category 1-5

• Typhoon

• causes a hurricane to rotate counter-clockwise

• coriolis affect