Hot air - Cold air: The Combat by claude19

Fractal • Atmosphere/Mood • posted on Oct 20, 2008

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Description

Une tornade (de l'espagnol tornado, dérivé du verbe tornar, tourner) est un vortex (tourbillon) de vents extrêmement violents, prenant naissance à la base d'un nuage d'orage (cumulonimbus) lorsque les conditions de cisaillement des vents sont favorables dans la basse atmosphère. De très faibles tornades peuvent également se développer sous des nuages d'averses (cumulus bourgeonnant). Ce phénomène météorologique a un pouvoir destructeur supérieur à celui d'un cyclone tropical au mètre carré, mais est de durée et d'étendue limitées : il concerne un corridor de quelques centaines de mètres de large sur quelques kilomètres de long. Certaines tornades ont engendré les vents les plus forts signalés à la surface du globe. Elles tuent chaque année de 300 à 400 personnes (selon une estimation de l'Organisation météorologique mondiale), dont 150 aux États-Unis A tornado (of the Spanish tornado, derived from the verb tornar, to turn) is a vortex (swirl) of winds extremely violent one, fascinating birth at the base of a cloud of a storm (cumulonimbus) when the conditions of shearing of the winds are favorable in the lower atmosphere. Very weak tornadoes can also develop under clouds downpours (budding cumulus). This weather phenomenon has a destroying capacity higher than that a tropical cyclone with the square meter, but is of duration and of extended limited: it relates to a corridor of a few hundred meters broad on a few kilometers length. Certain tornadoes generated the strongest winds announced to the surface of the sphere. They kill each year from 300 to 400 people (according to an estimate of the World Meteorological Organization), including 150 in the United States.