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A thunderstorm, also known as an electrical storm or a lightning storm, is a storm characterized by the presence of lightning [1] and its acoustic effect on the Earth's atmosphere, known as thunder. [2] Relatively weak thunderstorms are sometimes called thundershowers. [3] Thunderstorms occur in a type of cloud known as a cumulonimbus. [4]
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This process cause thunderstorm formation (and decay) to last for several hours or even over multiple days. Cumulonimbus clouds can also occur as dangerous winter storms called " thundersnow " which are associated with particularly intense snowfall rates and with blizzard conditions when accompanied by strong winds that further reduce visibility .
One can distinguish three stages in the evolution of a pulse storm: [2] Formation: the upward current of the cell intensifies and allows the condensation of water vapor from the rising air parcel. This forms a cumulus congestus , then a cumulonimbus when ice crystals form at its apex which spreads horizontally in contact with the tropopause.
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The formation of multicellular thunderstorms imply that the updraft in the mother thunderstorm is offset from its downdraft. New cells usually form in the upwind (usually western or southwestern) part of the storm where the downdrafts of the mature cells meet the environmental wind, lifting air parcels and triggering new convection.
In Canada, a severe thunderstorm is defined as having wind gusts of greater than 90 km/h (56 mph), hail with a diameter of greater than two centimetres (0.79 in), rainfall rates of greater than 50 millimetres (2.0 in) in one hour or greater than 75 millimetres (3.0 in) in three hours, or tornadoes. [14]
GameRankings and Metacritic gave it a score of 81.59% and 82 out of 100 for the PC version, [7] [8] and 81.65% and 81 out of 100 for the Xbox version. [ 6 ] [ 9 ] Combined sales of Island Thunder and Tom Clancy's Ghost Recon: Jungle Storm reached 1.1 million copies by the end of March 2004.