Download Tornadoes and Hurricanes

Catalyst:
1. Mouths are quiet.
2.Get your folder out and begin the quick
review section of your notes.
3.Raise your hand if you need something.
Quick Review
1. Give two populations
preyed on by large crabs?
Sea stars and sessile
invertebrates
2. What is a predator of sea
urchins?
Sea otters
3. Where do octopuses get
energy?
Large crabs and smaller
predatory fishes and
invertebrates
Quick Review
Classify the organism as
a producer (P),
consumer (C), or
decomposer (D).
4. Kelp:
P
5. Large crabs:
C or D
6. Sea otter:
C
7. Algae:
P
Weather
LESSON 8.8 – TORNADOES AND
HURRICANES
I can explain the conditions which give rise to tornadoes and
hurricanes and where they are likely to occur. (4c)
1. Tornadoes develop out of
thunderstorms.
Thunderstorms are the
result of warm, moist, low
pressure air that rises.
This is called an updraft.
a. When winds produced
by the storm blow in
opposite directions, the
air can begin rotating
horizontally to the ground.
I can explain the conditions which give rise to tornadoes and
hurricanes and where they are likely to occur. (4c)
b. As updrafts push
higher, the rotating air
is pushed into a
vertical position. This
is called a
mesocyclone and is
basically a large turning
cloud in the sky. This is
likely to form a
tornado.
I can explain the conditions which give rise to tornadoes and
hurricanes and where they are likely to occur. (4c)
c. When cold air from
high in the atmosphere
begins to sink toward
the ground
(downdraft), it can
bring part of the
mesocyclone to the
ground turning it into a
tornado.
I can explain the conditions which give rise to tornadoes and
hurricanes and where they are likely to occur. (4c)
d. Wind speeds range
from 100 MPH to 300
MPH.
e. Tornadoes usually
occur in the
Midwestern and
Southeastern United
States during the
spring and fall.
Tornadoes: Guided Practice
1. The very violent thunderstorms that are very likely to
cause tornadoes =
supercells
2. The other name for a mesocyclone =
area of rotation
3. Why is a tornado darkly colored?
The dust and debris it picks up.
4. The name of the rating scale of tornadoes =
Fujita scale. Smallest =
F0; largest =
F5
I can explain the conditions which give rise to tornadoes and
hurricanes and where they are likely to occur. (4c)
2. Hurricanes develop
over warm tropical
oceans that are at
least 80°F. Most
hurricanes that impact
the U.S. start as
thunderstorms off
the coast of Africa.
These are called
tropical
disturbances.
I can explain the conditions which give rise to tornadoes and
hurricanes and where they are likely to occur. (4c)
a. These thunderstorms have low pressure and very
moist air. As the air rises, it condenses forming
clouds. This releases heat which further lowers the
pressure causing the air to rise more.
I can explain the conditions which give rise to tornadoes and
hurricanes and where they are likely to occur. (4c)
b. Cold, dense air rushes down from high in the atmosphere
causing wind. This cold air is heated by the water and
begins to rise, creating a cycle with larger and larger clouds
forming and winds increasing in speed.
I can explain the conditions which give rise to tornadoes and
hurricanes and where they are likely to occur. (4c)
c. The moving air is
impacted by the Coriolis
effect which causes it to
begin rotating
counterclockwise.
d. While the disturbance is
over warm water, it will
continue to strengthen.
When winds reach 74
MPH, it is declared a
hurricane.
Hurricanes: Guided Practice
1. The area of low pressure in the center of a hurricane
= eye
2. Hurricanes that occur near Asia =
typhoons
3. The main tool that meteorologists use to study
hurricanes =
satellite images
I-N-D-E-P-E-N-D-E-N-T
DO YOU KNOW WHAT
THAT MEANS?
Exit Ticket
(5 QUESTIONS)
1. Which of these describes where
tornadoes form?
A.
B.
C.
D.
Warm tropical waters near the coast of
Africa.
High pressure air over the southwestern
U.S.
Thunderstorms in the midwest and
southeast U.S.
Dry air moving from the North Pole
2. Which of these describes an updraft?
A. Warm, low pressure air that rises.
B. Warm, high pressure air that rises.
C. Cold, low pressure air that sinks.
D. Cold, high pressure air that sinks.
3. Which of these is necessary for a
hurricane to form? There may be more
than one answer, you must select all of
them to receive full credit.
A.
B.
C.
D.
Low pressure air
Temperatures less than 80°
Tropical water
The rotation of the Earth
4. Which of these describes the eye of a
hurricane?
A.
B.
C.
D.
Low pressure air with strong winds and
heavy rain.
Low pressure air with no wind or rain.
High pressure air with strong winds and
heavy rain.
High pressure air with no wind or rain.
5. Based on the hurricane’s
path, which of these describes
the fate of this hurricane?
A. It will make landfall on
Alaska and weaken as it
moves over the land.
B. It will bounce off the
Kamchatka Peninsula,
spinning it down toward
Japan.
C. Cold arctic air around the
Aleutian Islands will push
the hurricane to move
south toward the
Hawaiian Islands.
D. Cold arctic air around the
Aleutian Islands will
weaken the hurricane, and
it will break apart before
hitting landfall.