Transcript severe weather project - isd194 cms .demo. ties .k12. mn .us

SEVERE WEATHER
PROJECT
Severe Thunderstorms
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Thunderstorm produce one or more of the
following conditions: high winds, hail, flash
floods, and tornadoes.
Tornado
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Wind moving in 2 directions causes a layer
of air in the middle to spin
Spinning column is turned vertical due to
strong updrafts
Low central pressure
A funnel cloud forms at the bottom of a
cumulonimbus cloud
Once it touches ground it is a tornado
Tornadoes occur in only 1% of all
thunderstorms.
Hurricanes
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Large, rotating tropical weather system
Most powerful storms on Earth
Occur at 5-20 degrees latitude N and S
Need warm water to form
Winds spiral in towards intense lowpressure storm center
Categories 1-5
Blizzards
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Blizzards are severe winter storms that pack a
combination of blowing snow and wind resulting
in very low visibilities.
While heavy snowfalls and severe cold often
accompany blizzards, they are not required.
Sometimes strong winds pick up snow that has
already fallen, creating a blizzard.
Officially, the National Weather Service defines
a blizzard as large amounts of falling OR
blowing snow with winds in excess of 35 mph
and visibilities of less than 1/4 of a mile for an
extended period of time (greater than 3 hours).
Flood
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Flooding is when the water level in a
creek, river, lake or the sea rises and
covers land that is usually dry.
While some floods occur without problem,
others are devastating, causing largescale destruction and significant loss of
life.
Flooding is experienced all over the world
and in some countries such as
Bangladesh, flooding occurs regularly.
Wildfire
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Any uncontrolled, non-structure fire that
occurs in the wilderness.
Wildfires differ from other fires only by
their extensive size; the speed at which it
spreads out from its original source; its
ability to change direction unexpectedly;
and to jump gaps, such as roads, rivers
and fire breaks.
Lightning
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An electric discharge that occurs between
a positively charged area and a negatively
charged area.
Lightning can occur between two clouds,
between Earth and a cloud or between two
parts of the same cloud.
When lightning strikes, energy is released,
which causes air to expand and rapidly
send out sound waves (thunder).
Pick a Storm
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Hurricanes
Andrew
 Rita
 Katrina
 Hugo
 Ivan
 Galveston
 Wilma
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Blizzards
Halloween
 Great Blizzard of
'49
 Armistice Day
Blizzard
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Pick a Storm
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Tornados
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St. Peter
Hugo
Tri-State
April 3-4, 1974: Super
Outbreak
The Natchez Tornado
on May 7, 1840
The St. Louis/East St.
Louis Tornado on May
27, 1896
The Gainesville
Tornado on April 6,
1936
South Minneapolis
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Floods
 1997 Red River
Flooding
 2009 Red River
Flooding
 2010 Flooding
 Flooding in another
country
 2010 Tennessee
Wildfire
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Boundary Waters
Canoe Area (BWCA)various years
California-focus on one
or in general
Hinkley Fire