Severe Thunderstorms

Severe Thunderstorms are storms where thunder and lightning occur.  

This severe thunderstorm is rolling over a small city.

Formation

Water vapor goes up into the atmosphere and collects forming a cloud. When too much water vapor collects in the cloud, it is forced to get rid of some of the water vapor by dumping it in the form of precipitation. When the warm air is forced to raise, it will continue to raise because the surrounding air is less dense the warm air. To form a thunderstorm it needs to be 75* F or more(23* C or more). A thunderstorm is usually a cumulonimbus cloud. It can extend 20 kilometers(12.4 miles) into the sky.

This picture show the prosses of formation for a thunderstorm

Winds

Winds in a thunderstorm can reach 160 miles per hour. When winds reach more than 70 mph the thunderstorm can produce hail.

History

In Fort Worth, Texas May 5, 1995. One person died, and 400 people were injured. The damage cost came up to 2 billion U.S dollars.

In Widecombe, England October 21, 1638. Four people died and 60 were injured. No damage cost recorded.

A ball of lightning strikes the St Pancras church in Widecombe, England

How to Prepare for Thunderstorms

To prepare for a thunderstorm by building their house with a lightning rod on top. Also people will watch the new when they hear of a thunderstorm to see where it's heading. Another thing people do to is buy a walky talky that will alert you when a thunderstorm is coming.

Sources

World Book Online - E Library Research Resources

weatherwizkids.com

nssl.noaa.gove/primer

http://scied.ucar.edu/webweather/thunderstorms

Works Cited

Galiano, Dean. Thunderstorms and Lightning. New York: Rosen Central, 2000. Print.

"How Thunderstorms Form." UCAR Center for Science Education. Web. 12 Mar. 2015. <http://scied.ucar.edu/webweather/thunderstorms/how-thunderstorms-form>.

"National Weather Service Weather Forecast Office." Mayfest15. Web. 14 Mar. 2015. <http://www.srh.noaa.gov/fwd/?n=mayfest15>

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"USATODAY.com." USATODAY.com. Web. 13 Mar. 2015. <http://usatoday30.usatoday.com/weather/tg/wsevstrm/wsevstrm.htm>.

Science Textbook

Glossary

Cumulonimbus cloud-

  1. Cumulonimbus cloud, from the Latin cumulus ("heap") and nimbus ("rainstorm", "stormcloud"), is a dense towering vertical associated with thunderstorms and atmospheric instability, forming from water vapor carried by powerful upward air currents.
  2. Lightning, the occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud, accompanied by a bright flash and typically also thunder.
  3. Lightning Rod, a metal rod or wire fixed to an exposed part of a building or other tall structure to divert lightning harmlessly into the ground.
  4. Precipitation, rain, snow, sleet, or hail that falls to the ground.

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