L 26
Tornadoes
Created by
Karen
Duong Oct
2012
Tornadoes
• http://video.nationalgeographic.com/video/e
nvironment/environment-naturaldisasters/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/e
nvironment/environment-naturaldisasters/hurricanes/katrina-formation/
Videos
• http://www.watchknowlearn.org/Video.aspx?
VideoID=3483&CategoryID=771
• http://video.nationalgeographic.com/video/e
nvironment/environment-naturaldisasters/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)
b)
c)
d)
Maritime
Continental
Polar
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)
b)
c)
d)
Cold
Warm
Stationary
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?