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What is a hurricane?A hurricane is a very destructive and
dangerous storm. It forms in stages.
The hurricanes are filled with rain,
strong winds, lightning, thunder, hail
and tornadoes. In these storms, when
the winds range from 35 to 54 miles an
hour, it is called a tropical depression.
When the winds are from 55 to 74
miles an hour then it is called a
tropical storm. When it reaches 75
miles an hour, it is called a hurricane.
Hurricanes rotate counterclockwise
in the northern hemisphere and
clockwise in the southern
hemisphere.
What is eye of a hurricane?
While some hurricanes, are
small, others can be quite
large. Hurricanes are mighty
storms.
In the center of a hurricane
is an eye. Ironically, the eye
is actually a calm area in a
hurricane.
How do hurricanes travel?Hurricanes have “paths” in which
they travel and move at different
speeds over water and land.
Once they hit land, they do slow
down and weaken. Warm water
“feeds” the hurricane and helps
them grow larger and stronger.
When hurricanes make “landfall”
they have entered land a certain
area. Due to the fact that they are
huge storms, the areas surrounding
landfall are also affected.
What’s in a name?
During World War II, they practiced using
women’s names for the storms. In 1951 the
United States adopted a plan to name
storms by a phonetic alphabet (Able,
Baker, Charlie), but found it confusing.
Hurricanes names are chosen from a list
selected by the World Meteorological
Organization. The Atlantic is assigned six
lists of names, with one list used each
year. Every sixth year, the first list begins
again. Each name on the list starts with a
different letter, for example, the name of
the very first hurricane of the season
starts with the letter A, the next starts with
the letter B, and so on. The letters "Q",
"U", "X", "Y" and "Z", however, are not
used. Often when an unusually destructive
hurricane hits, that hurricane's name is
retired and never used again.
Saffir-Simpson Hurricane Scale
Category Wind speed (mph) Storm surge (feet)
5 156 More than18
4 131–155 13–18
3 111–130 9–12
2 96–110 6–8
1 74–95 4–5
Additional classifications
Tropical storm 39–73 0–3
Tropical depression 0–38 0
How do they measure hurricanes?
Where have hurricanes made landfall in the United States?
• In the next few slides, you will
see the hurricanes which have
made “landfall” in the US.
Hurricanes have made landfall in
other countries as well. These
slides however show only US
Hurricanes.
• Note: These maps do not
include Tropical Storms or
Tropical Depressions, just
Hurricanes.)
• Can you find the hurricanes
which may have hit your state?
Hurricane Trivia: Deadliest Storm
• The Galveston Hurricane of 1900
made landfall on the city of
Galveston, Texas on September 8,
1900. It had estimated winds of
135 mph (215 km/h) at landfall,
making it a Category 4 storm on
the Saffir-Simpson HurricaneScale.
– Picture and information Source: Galveston Hurricane of 1900 -Wikipedia, the free encyclopedia
During he 1900 Storm: Galveston,Texas, 6,000 people died and itdestroyed the city. See GalvestonPhotos.
Hurricane Trivia: Costliest Storm
Animated photo from CIMSS
Hurricane Katrina of the 2005 Atlantic hurricane season was the costliest
hurricane. The total damage from Katrina is estimated at $81.2 billion
Has technology changed hurricane situations?
Think about this. How do you think technology has changed Hurricane
awareness and safety? The map on the left is a map from Hurricane
Hilda in 1964. The map on the right is a map of Hurricane Rita in 2005.
If the technology now available had existed for the 1900 Galveston
Hurricane, could the outcome have been different? How? Why?
Explain your --write a paragraph about it.
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