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The action of warm air rising and cold air sinking (convection) plays a key role in the formation of severe thunderstorms. If the warm surface air is forced to rise, it will continue to rise, because it is less dense than the surrounding air.
Two of the most important ingredients for thunderstorm formation are instability (unstable air) and moisture.

Storm - Wikipedia

en.wikipedia.org/wiki/Storm

A storm is any disturbed state of an environment or astronomical body's atmosphere especially ... High wind is also the cause of sandstorms in dry climates.

What causes storms? | Reference.com

www.reference.com/science/causes-storms-1bc6db6f4066aa04

Storms are formed when the movement of cold and warm air currents creates extreme ... is created at an atmospheric level as warm wet air rushes, causing cold.

Thunderstorms - Weather Wiz Kids weather information for kids

www.weatherwizkids.com/weather-thunderstorms.htm

A thunderstorm is a storm with lightning and thunder. ... Since opposites attract, that causes a positive charge to build up on the ground beneath the cloud.

What causes thunderstorms?

www.weatherquestions.com/What_causes_thunderstorms.htm

Nov 28, 2010 ... Brief, simplified description of what causes thunderstorms.

What causes Severe Weather? - Geoscience Australia

www.ga.gov.au/scientific-topics/hazards/severe-weather/basics/causes

... which has the potential to cause significant damage. Severe thunderstorms produce wind gusts of 90km/h or more, with peak ...

Thunderstorm Basics - NSSL The National Severe Storms Laboratory

www.nssl.noaa.gov/education/svrwx101/thunderstorms/

Many hazardous weather events are associated with thunderstorms. Under the right conditions, rainfall from thunderstorms causes flash flooding, killing more ...

What causes severe storms? - Tornado Titans - Storm Chasing ...

tornadotitans.com/lesson/what-causes-severe-storms/

Despite what you may have heard, severe weather does not magically occur with no rhyme or reason. To get severe thunderstorms, you need plenty of lift, ...

How Do Thunderstorms Form? - Dangerous Weather

eo.ucar.edu/kids/dangerwx/tstorm4.htm

Orographic thunderstorms are caused by air that is forced up by a mountain or hillside. Air mass thunderstorms are the result of localized convection in an ...

www.ask.com/youtube?q=What Causes Storms?&v=CW_SKUtIRc0
Nov 8, 2013 ... The Philippines are hit by more than 20 tropical storms a year, says the BBC's Jay Wynne. At least three or four turn into typhoons. But why is ...