Transcript Hurricanes - SUSDIntelEssentials12

Lynette Kampa
Kiva Elementary
A hurricane is a powerful storm that
begins over a warm ocean as a cluster of
thunderstorms. This group or cluster of
thunderstorms grows and gains enough
strength from the heat and moisture
from the warm ocean to become a
hurricane.
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The winds of a hurricane swirl around a
calm middle zone called the eye. The
eye is surrounded by a band of tall,
dark clouds called the eye wall. The eye
is usually 10 to 40 miles in diameter and
is free of rain and large clouds. These
winds can reach nearly 200 miles per
hour. Damaging winds may extend 250
miles from the eye.
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Hurricanes are referred to by different
names, depending on where they start.
They are called hurricanes in North
Atlantic Ocean, or the Northeast Pacific
Ocean. They are known as typhoons if
they occur in the Northwest Pacific
Ocean and tropical cyclones when they
are near Australia and in the Indian
Ocean.
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Hurricanes occur most during the summer and
early fall in the Atlantic and Northeast Pacific
Oceans
Typhoons occur throughout the year in the
Northwest Pacific but are most frequent in
summer.
In the North Indian Ocean, tropical cyclones
strike in May and November. In the South
Indian Ocean, the South Pacific Ocean, and off
the coast of Australia, the hurricane season
runs from December to March.
Meteorologists have divided hurricanes
into four stages:
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tropical disturbance
tropical depression
tropical storm
hurricane
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Tropical disturbance is when moist
air rises and becomes cooler and
forms rain clouds. The excess water
changes into tiny droplets of water
that form clouds. The clouds in a
tropical disturbance may rise to
great heights, forming
thunderclouds called cumulonimbus
clouds.
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Tropical depression is a low-pressure
area surrounded by winds that blow in a
circular pattern. This low pressure area
near the ocean surface draws in warm,
moist air, which feeds more
thunderstorms. When the winds exceed
38 miles per hour, a tropical storm has
developed. The storm clouds now have a
well-defined circular shape from above.
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A tropical storm has developed when the
winds exceed 38 miles per hour. The storm
clouds now have a well-defined circular shape.
The strong winds near the surface of the ocean
draw more and more heat and water vapor
from the ocean. The increased warmth and
moisture in the air feed the storm. The warmer
this column becomes, the more the pressure at
the surface falls. The falling pressure, in turn,
draws more air into the storm. As more air is
pulled into the storm, the winds blow harder.
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A tropical storm reaches hurricane status
when its winds exceed 74 miles per hour.
At this point the storm reaches hurricane
intensity, it has a well-developed eye at
its center. Surface pressure drops to its
lowest in the eye. In the eyewall, warm
air spirals upward, creating the
hurricane's strongest winds. The speed of
the winds in the eyewall is related to the
diameter of the eye.
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Hurricane damage is created from the wind and
water. Hurricane winds can uproot trees and tear
the roofs off houses. The fierce winds also create
danger from flying debris. Heavy rains may cause
flooding and mudslides.
The most dangerous effect of a hurricane, however,
is a rapid rise in sea level called a storm surge. A
storm surge is produced when winds drive ocean
waters ashore. Storm surges are dangerous
because many coastal areas are densely populated
and lie only a few feet or meters above sea level.
history.
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FEMA Helps Families Recover and Communities rebuild
In the two years since Hurricanes Katrina and Rita struck the Gulf
Coast, FEMA has provided billions of dollars in assistance to help
people in Louisiana, Mississippi, Texas and Alabama rebuild their
lives, their homes and their communities.
FEMA has provided approximately $7.6 billion to over 1.4 million
households who suffered damage or lost everything - homes, cars
and all their belongings. The money was used to make 185,000
damaged homes habitable again. For homes beyond repair, the
money is being used to relocate families and to replace necessary
items lost in the disaster.
FEMA also has provided more than $8.3 billion in Public
Assistance grants to help state and local governments rebuild
schools, hospitals, roads, and government buildings and to
remove debris left by the storms. Two years after, FEMA has
removed of over 111 million cubic yards of debris, enough to fill
20 Superdomes.
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There are approximately 85 hurricanes, typhoons,
and tropical cyclones occur in a year throughout
the world.
A 1970 cyclone in East Pakistan (now Bangladesh)
produced a surge that killed about 266,000 people.
A hurricane in Galveston, Texas, in 1900 produced
a surge that killed about 6,000 people, the worst
natural disaster in United States
Hurricanes rotate in a counter-clockwise direction
around an "eye." The center of the storm or "eye" is
the calmest part.
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1.) How are hurricanes formed?
2.) What kind of damage can be caused by a
hurricane?
3.) Explain when does a tropical storm becomes
a hurricane?
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Hurricane - a severe tropical storm in which
winds with speeds in excess of 116 km/h (73
mph) blow around an area of intensely low
pressure; towering clouds bring torrential rain
Eye- The calm middle zone where winds of a
hurricane swirl around
Cumulonimbus Cloud - a towering cloud that
extends upward to levels of 6-7 km above the
earth's surface. Strong updrafts and
downdrafts are associated with this cloud
generating heavy rain and often hail.
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http://mmem.spschools.org/grade5science/weat
her/hurricanediagram.html
http://www.learnnc.org/lp/multimedia/2367
http://www.nasa.gov/worldbook/hurricane_wor
ldbook.html
http://www.teachnetlab.org/hornik/hurricanes/hurricanediagram.htm
http://www.weatherwizkids.com/weatherhurricane.htm
http://www.fema.gov/kids/hurr.htm
http://kids.earth.nasa.gov/archive/hurricane/to
ur.html