Thunderstorm and Tornadoes Specific Purpose

Topics: Thunderstorm, Tornado, Wind Pages: 2 (587 words) Published: November 24, 2008

Subject: Tornadoes

General Purpose: To inform the audience about tornadoes
Specific Purpose: Today I will discuss some fascinating facts about tornadoes. Also, I will discuss the causes, occurrences, myths, and oddities associated with tornadoes.


Have you ever seen a tornado or known someone who has? Tornadoes can be devastating and can occur anywhere at anytime so you may be affected by one or know someone who will. I am fascinated by tornadoes and have done research in the last couple days preparing for this speech. Body:

I. What causes a tornado?
A. Tornadoes occur when thunderstorms develop in warm, moist air in advance of eastward-moving cold fronts. These thunderstorms often produce large hail, strong winds, and tornadoes. B. In the Central Plains, thunderstorms frequently develop along a "dryline", which separates very warm, moist air to the east from hot, dry air to the west. Tornado-producing thunderstorms may form as the dryline moves east during the afternoon hours. II. Tornadoes can occur at anyplace or anytime.

A. Peak months of tornado activity in the U.S. are April, May, and June. However, tornadoes have occurred in every month and at all times of the day or night. A typical time of occurrence is on an unseasonably warm and sultry Spring afternoon between 3 p.m. and 9 p.m. In some states, a secondary tornado season occurs in the fall. B. In fact, reports that among the 25 deadliest tornadoes, the top ranked occurred in the tri-state area of Missouri, Illinois, and Indiana in 1925. 689 people were killed. Other top-ranked deadly tornadoes have occurred in Mississippi, Georgia, Wisconsin, and Michigan. III. There are many myths that people have about tornadoes. A. The first myth is that areas near rivers, lakes, and mountains are safe from tornadoes. In fact, no place is safe. In the late 1980s, a tornado...
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