Severe Storms

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Intro
Severe Storms
Quiz
Christy Wagner
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Storms

• Violent disturbances in the atmosphere
• Caused by changes in air pressure and air
  movement
• Examples thunderstorms, tornadoes, hurricanes,
  and winter storms

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Thunderstorms
View Pictures
Movie Clips

• Form in large cumulonimbus clouds (thunderheads)
• Contents water vapor, cold air, a push force
  (cold front)
• Produce rain, hail, thunder, lightning
• Thunder occurs when the heated air expands
  rapidly and explodes

Air Cools to Form Clouds
Warm Moist Air
Cold Front
To Lightning
Home
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Thunderstorm Pictures
Thunderhead Cloud
Active Thunderstorm
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Lightning
View Pictures
Movie Clips

• Spark of energy released from a storm
• Lightning is seen before thunder is heard
• Second highest cause of weather related deaths
• Florida experiences the most lightning strikes
  per year

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Lightning Pictures
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Tornadoes
Movie Clips
View Pictures

• Whirling, funnel-shaped clouds that extend from
  storm clouds to Earths surface
• Develop in cumulonimbus clouds
• Occur with thunderstorms during the spring
  early summer
• Usually occur over a short period of time, but
  are very destructive
• Intensity and destructiveness measured by the
  Fujita Scale
• Commonly occur in Tornado Alley

Home
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Intensity Destruction
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Tornado Frequency
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Tornado Pictures
F2 Destruction
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Hurricanes
View Pictures
Movie Clips

• Tropical storms with winds of 74 miles/hr or
  higher
• Form over oceans as the warm air rises to form
  clouds and causes the winds to spiral inward
  toward an area of low pressure.
• Driving force warm, moist air
• Eye calm center of the storm
• Rotation counterclockwise around the eye
• Produce strong winds, high waves, heavy rains,
  and storm surges
• Weaken as they pass over land due to a lack of
  moisture

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• Classification
• Atlantic Ocean Hurricanes
• Pacific Ocean Typhoons
• Indian Ocean Cyclones
• Duration more than a week
• Season June 1st Nov 30th
• Names Given in alphabetical order and alternate
  between male and female. Examples

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Hurricane Pictures
Hurricane Fran
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Winter Storms

• During the winter in the Northern Hemisphere,
  arctic and polar air masses move south from
  Canada into the U.S.
• At this same time the warm, tropical air masses
  move north from the Gulf of Mexico
• When these two air masses collide, intense winter
  storms develop

Polar Air
Storms
Tropical Air
Home
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Lake-Effect Snow

• As a cold, dry air mass moves across a lake, it
  picks up moisture from the lake.
• When the air mass reaches the other side of the
  lake, the air rises and cools.
• Then water vapor condenses and falls back to the
  Earth as snow.

• In the U.S., most lake-effect snow
• occurs in the region surrounding the
• Great Lakes.
• Click here to find the cities where most
• of the snow occurs.

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Other Winter Events

• Blizzards
• Low Temps below 20 F
• High Winds above 35 mph
• Snow falling and blowing in the air
• Visibility reduced
• Ice Storms
• Noreasters

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Question 1

• What storm event occurs in cumulonimbus clouds?

1. Tornado
2. Hurricane
3. Thunderstorm
4. Both A C

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Try Again!
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Question 2

• What storm event has a season that occurs between
  June 1st and November 30th?

1. Tornado
2. Hurricane
3. Thunderstorm
4. Winter Storm

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Question 3

• What storm event has an eye or center of the
  storm?

1. Tornado
2. Hurricane
3. Thunderstorm
4. Winter Storm

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Question 4

• What storm event measures intensity by the Fujita
  Scale?

1. Tornado
2. Hurricane
3. Thunderstorm
4. Winter Storm

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Question 5

• What storm event is the second highest cause of
  weather related deaths?

1. Tornado
2. Hurricane
3. Thunderstorm
4. Lightning

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Question 6

• What storm event is characterized by cold
  temperatures and reduced visibility?

1. Tornado
2. Hurricane
3. Thunderstorm
4. Winter Storm

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Question 7

• What storm event produces a storm surge?

1. Tornado
2. Hurricane
3. Thunderstorm
4. Winter Storm

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Question 8

• What storm event needs water vapor, cold air, a
  push force?

1. Tornado
2. Hurricane
3. Thunderstorm
4. Winter Storm

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Question 9

• What storm event happens during a short period of
  time?

1. Tornado
2. Hurricane
3. Thunderstorm
4. Winter Storm

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Question 10

• What storm event can also be called a cyclone?

1. Tornado
2. Hurricane
3. Thunderstorm
4. Winter Storm

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The End
Bibliography
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Bibliography

• Lightning Map - http//www.crh.noaa.gov/pub/ltg/cr
  h_flash_maps.html
• Thunderstorm Pictures
• www.suite101.com/ article.cfm/13646/93996
• www.ktabtv.com/ weather20gallery.htm
• Lightning Pictures
• http//www.weatherbook.com/images/lightning.jpg
• http//www.mike-sheryl.com/images/blog/thunderstor
  m.jpg
• Fujita Scale
• http//www.whyy.org/tv12/franklinfacts/may3101_1.j
  pg
• http//jeffcoweb.jeffco.k12.co.us/isu/science/9wea
  ther/tornado/img002.jpg
• Tornado Frequency
• Alley http//www.noaanews.noaa.gov/stories/images
  /tornadyalley-climatology.jpg
• Risk http//www.usgs.gov/themes/tornado.gif

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• Tornado Pictures
• http//www.sciencenews.org/articles/20020511/a1648
  _1816.jpg
• http//www.stormchase.us/99ChasePics/IA14.jpg
• http//www.klln.fm/newark/tornado/images/torn_dest
  ruction.jpg
• Hurricane Symbol http//www.fema.gov/kids/hurr.h
  tm
• World Map http//www.worldatlas.com/aatlas/newart
  /imagea.gif
• Hurricane Pictures
• http//sealevel.jpl.nasa.gov/overview/images/overv
  iew-hurricane.jpg
• http//www1.ncdc.noaa.gov/pub/data/images/hurrican
  e-fran-reduced.gif
• Media Clips www.stormstock.com
• North America Map http//koti.mbnet.fi/kaller/wor
  k/north-america-map.gif
• Lake-Effect Snow http//www.islandnet.com/7Esee/
  weather/elements/lkefsnw2.htm
• Blizzards http//www.unl.edu/scarlet/v13n5/blizza
  rd.jpg
• Ice Storm http//www.oriononline.org/images/om/01
  _4om/doheny_3.jpg

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