Storms are organized areas of disturbed weather, especially those affecting the Earth’s surface, implying inclement and possibly destructive weather.
They can be considered:
- As a complex of pressure, wind, clouds, precipitation, etc. Thus, storms range in scale from tornadoes and thunderstorms on the small side to tropical cyclones and extra-tropical cyclones on the large side.
- From a local and special interest point of view, identifying them by their most destructive or spectacular aspects, e.g.: rainstorms, windstorms, hailstorms, snowstorms, etc. Special cases are blizzards, ice storms, sandstorms, and duststorms.
- According to their wind speed. In the Beaufort wind scale, a storm is a wind with a speed from 48 to 55 knots (55-63 MPH or 89-102 KPH) or Beaufort Number 10 (Force 10).
- Convective or local storms- these are originated by the solar heating at the lower layers of the atmosphere. They are usually brief and extended over small areas.
- Cyclonic or depression storms- they are characterized by a barometric pressure diminishment and usually burst when pressure rises and temperature lowers. They can last for hours and are developed in extensive areas.