Shawnee, Oklahoma and Moore Oklahoma


Describe step by step how a tornado forms.

What is a tornado?

A tornado is a mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud and advancing.

How dose a tornado form?


1. Before thunderstorms develop, a change in wind direction and an increase in wind speed with increasing height creates an invisible, horizontal spinning effect in the lower atmosphere.

2. The first step causes rising air within the thunderstorm updraft tilts the rotating air from horizontal to vertical.

3. An area of rotation, 2-6 miles wide, now extends through much of the storm. Most strong and violent tornadoes form within this area of strong rotation.

4. A lower cloud base in the centre of the photograph identifies an area of rotation known as a rotating wall cloud.

5.Moments later a strong tornado develops in this area. Softball-size hail and damaging "straight-line" winds also occurred with this storm.


Tornadoes usually result from a very large thunderstorm. Cold air and warm air combine, and the cold air goes down as the warm air rises. This warm air eventually twists into a spiral, forming a funnel cloud. As the sky turns a very dark green colour, the tornado begins its path of destruction.

The scale that is used to to measure tornadoes

The scale that is used to measure tornados is called Fujita. The Fujita scale can measure the strength of the tornado based on damage it dose. For example With winds of less than 73 miles per hour (116 kph), F0 tornadoes are called "gale tornadoes" and cause some damage to chimneys, damage sign boards, and break branches off of trees and topple shallow-rooted trees.

Tornado alley

Tornado Alley includeds :
  • Texas
  • Colorado
  • Kansas
  • Nebraska
  • Oklahoma
  • Arkansas
  • Illinois
  • Indiana
  • Missouri

Shawnee and Moore Oklahoma tornados

Shawnee tornado

The wind speed of the Shawnee tornado was 150 mph. This tornado killed two people injured twenty-one that were reported. A mobile home park was one of the places were the tornado hit the most and left many people with out a home,clothes,vehicles,etc. The width of the tornado was 2.4 miles wide.

Moore tornado

The wind speed of the Moore tornado was 166 to 2000 mph. The width of this tornado was 2 miles wide. It killed twenty-four people, hundred forty-five people were injured some were minor but others were critical. Three hundred homes were destroyed. 38,000 electricity costumers were left with out power.This storm came with a very large amount of large hail.
2 Mile-Wide Tornado in Moore, Oklahoma - May 20, 2013
5/19/2013 Shawnee, OK Wedge Tornado

Areas that were also affected

Other areas that were also affect by tornados are Kansas, Illinois, and Iowa. Up to 28 tornados affected these areas including Oklahoma.


A tornado is a storm that forms when warm air and humidity combine. The Shawnee, and Moore tornado were two very extreme storms that destroyed homes, and killed people. These two storms happened during this week in Tornado Alley.