The drill is a part of Severe Weather Awareness Week.
The drill was to take place Tuesday, but because of subfreezing temperatures, storm sirens in many parts of Missouri could not be sounded.
Today, schools, businesses and Missouri residents are urged to take part in the drill by practicing their own tornado response plan. The spring storm season runs from March through June, although tornadoes can break out any time of the year when conditions are right.
Learn more about the history of tornadoes in Missouri, storm deaths by county, and safety tips for severe storms and flooding on the National Weather Service web site.
And get more information about Severe Weather Awareness Week here.
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