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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.

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.

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.

www.weatherquestions.com/What_causes_thunderstorms.htm

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

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.

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 ...

www.stormsurf.com/page2/tutorials/weatherbasics.shtml

When the warm air is forced up, it causes surface air pressure to drop, sort of like ... In the north hemisphere, wind rotates counter-clockwise around a storm ...

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

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

www.theguardian.com/science/2012/mar/08/solar-storms-sun-earth

Mar 8, 2012 ... On occasion, magnetic storms on the surface of the star can end up causing flares, an explosion on the Sun's surface that can release as much, ...

news.nationalgeographic.com/2016/10/hurricanes-facts-storms-weather-science

Oct 6, 2016 ... WATCH: Hurricanes are massive storms with deadly force. Find out how they form, and what's being done to better predict their impact.