L 26 Tornadoes

Created by Karen Duong Oct 2012

Tornadoes

• http://video.nationalgeographic.com/video/environment/environment-natural-disasters/tornadoes/tornadoes-101/

L26 Tornadoes• What does a tornado look like?

• What is a tornado? • A tornado is a violent, rotating column of air stretching from a cloud to the

ground.

• Weather conditions needed to form tornadoes:• Warm, humid air mass meets cold, dry air mass• Cold air moves under the warm air, forcing it to rise

• What do we call a tornado that forms over water?• Waterspouts

Tornadoes

• What makes them dangerous? • Strong winds and flying debris

• Tornado Watch: tornadoes are possible in your area• Tornado Warning: tornado has been seen in the sky or on

radar

Safety: basement, bathroom, under heavy furniture, away from windows, or lie flat in a ditch

Hurricanes

Hurricanes

• http://youtu.be/k35Gwb0FFU0

Hurricanes

• What is a hurricane:– Large rotating tropical weather system

• How are they formed?– When wind traveling in two different directions

meet– Over warm ocean water– Energy comes from condensation of water vapor

evaporating from ocean

Hurricanes

• What makes them dangerous?– Storm surges: A dome of water sweeps across

the coast– Heavy rain = floods– Wind

• Safety: – Evacuate area– Cover windows with plywood– Stay indoors

Hurricanes

• http://video.nationalgeographic.com/video/environment/environment-natural-disasters/hurricanes/katrina-formation/

Videos

• http://www.watchknowlearn.org/Video.aspx?VideoID=3483&CategoryID=771

• http://video.nationalgeographic.com/video/environment/environment-natural-disasters/tornadoes/water-spouts/

L 26 E.O.P

Review:1. List 4 types of air masses.2. What does it mean if an air mass is warm

and humid?3. List the 4 types of fronts.4. Which front can bring weird weather (an

example would be hail)?

1. List 4 types of air masses.a) Maritimeb) Continentalc) Polard) Tropical

2. What does it mean if an air mass is warm and humid?a) Maritime Tropical: near equator and over water

3. List the 4 types of fronts.a) Coldb) Warmc) Stationaryd) Occluded

4. Which front can bring weird weather (an example would be hail)? What is happening to the air masses?

a) Occluded: warm front trapped between two cold fronts

E.O.P

• How are tornadoes formed?– What makes them so dangerous?

• How are hurricanes formed?– What makes them so dangerous?