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Severe Weather

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by

Michael Miller

on 7 March 2016

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Transcript of Severe Weather

Severe Weather
Thunderstorms are small, intense weather systems.

Strong winds

Heavy rain

Lightning and thunder

Occur along cold fronts
Thunderstorms
In order for thunderstorms to occur:
The air near the Earth’s surface must be warm and moist.
The atmosphere must be unstable
The air surrounding the rising warm air mass is colder.
This causes the warm air to rise rapidly.
Lightning and thunder
Lightning is a large electrical discharge between two oppositely charged surfaces.
Thunder is the sound that results from the rapid expansion of air along the lightning strike.
Thunderstorms
A tornado is a small, rotating column of air.

Forms during thunderstorms.

High wind speeds

Center of a tornado is called a vortex.

75 % of a all tornadoes occur in the U.S.

U.S. averages about 1,000 per year
Tornadoes
Wind travels in two different directions.

Air between begins to roll.

The “roll” turns vertically and begins to rotate because of the updrafts.

Turns into a funnel and touches the ground.
Tornado Formation
Waterspouts are tornadoes that form over water.


Tornado Alley – an area east of the Rocky Mountains. It is mainly in Texas, Oklahoma, and Kansas that experiences the highest number of tornadoes per year.
Why? Cool dry air (north) meets warm moist air (south).
Tornadoes
Fujita Scale
Tornado Alley
F-0 40-72 mph, chimney damage, tree branches broken
F-1 73-112 mph, mobile homes pushed off foundation or overturned
F-2 113-157 mph, considerable damage, mobile homes demolished, trees uprooted
F-3 158-205 mph, roofs and walls torn down, trains overturned, cars thrown
F-4 207-260 mph, well-constructed walls leveled
F-5 261-318 mph, homes lifted off foundation and carried considerable distances, cars thrown as far as 100 meters
Fujita Scale
Watch this video about thunderstorm formations:
http://www.watchknowlearn.org/Video.aspx?VideoID=27320&CategoryID=2672
Watch this video about tornadoes: http://video.nationalgeographic.com/video/101-videos/tornadoes-101
The End :)
HURRICANES
1935 Florida Keys Labor Day Hurricane
1969 Hurricane Camille
1992 Hurricane Andrew

Only 3 Category 5 hurricanes
have ever made landfall (hit land) in the United States.

Hurricane Katrina – 2005
She was a Category 5 at one point, but she made landfall in U.S. as a category 4.

Saffir-Simpson Scale Wind Speeds

The scale to measure hurricanes is call the Saffir Simpson Scale.
Category 1 is the weakest.
Category 5 is the strongest: winds > 157 mph.



Saffir Simpson Scale

Rain bands – the spiral bands of clouds surrounding the eye wall.
The largest part of a hurricane


Parts of a hurricane

Eye – the calm, low pressure center of a hurricane.
5-30 miles wide.



Parts of a hurricane

Parts of a hurricane

1. Tropical Wave: a large, unorganized area of rain.
This usually forms off the coast of Africa.
No symbol.

2. Tropical Depression: a storm spinning counterclockwise with winds <39 mph.
Symbol is:

Development

If the hurricane moves into colder water.


If the hurricane moves over land.

So what would cause a hurricane to weaken?

Larry
Mindy
Nicholas
Odette
Peter
Rose
Sam
Teresa
Victor
Wanda

Ana
Bill
Claudette
Danny
Erika
Fred
Grace
Henri
Ida
Joaquin
Kate

2015 Hurricane Names
Storm surge – large surge of water near the coast.
This causes the most damage!

Storm Surge

Hurricane: a storm spinning counter clockwise with winds > 74 mph.
Symbol:

Development

Tropical Storm: a storm spinning counter clockwise with winds between 39 and 73 mph.

Symbol:

Development

H

L

1. Ocean water temperature 80°or more.
2. Surface level low pressure



3. Upper level high pressure.
Ingredients for a hurricane to form:

Saffir Simpson Scale

L
Parts of a Hurricane
Eye wall – the dense wall of thunderstorms surrounding the eye.
The strongest and most intense part of a hurricane.
Hurricane Katrina Video
Click on this link below to watch a video about the formation of Hurricane Katrina:

http://video.nationalgeographic.com/video/environment/environment-natural-disasters/hurricanes/katrina-formation/
The End :)
Hurricane season is from June to October.
Full transcript