Topics: Tornado, Tornado outbreak, Thunderstorm Pages: 15 (5669 words) Published: November 5, 2014
Ministry of Educational Zone Tornado INTRODUCTION The word tornado is an altered form of the Spanish word tronada, which means thunderstorm. This in turn was taken from the Latin tonare, meaning to thunder. It most likely reached its present form through a combination of the Spanish tronada and tornar. A tornado is also commonly referred to as a twister, and is also sometimes referred to by the old-fashioned colloquial term HYPERLINK http// o Cyclone cyclone. HYPERLINK http// l cite_note-TT-11 12 The term cyclone is used as a synonym for tornado in the often-aired 1939 film, HYPERLINK http// o The Wizard of Oz (1939 film) The Wizard of Oz. The term twister is also used in that film, along with being the title of the 1996 tornado-related film HYPERLINK http// o Twister (1996 film) Twister. Funnel cloud Main article HYPERLINK http// o Funnel cloud Funnel cloud HYPERLINK http// HYPERLINK http// o Enlarge This tornado has no funnel cloud however, the rotating dust cloud indicates that strong winds are occurring at the surface, and thus it is a true tornado. A tornado is not necessarily visible however, the intense low pressure which causes the high wind speeds (as described by HYPERLINK http// o Bernoullis principle Bernoullis principle) and rapid rotation (due to HYPERLINK http// o Cyclostrophic balance cyclostrophic balance) usually causes HYPERLINK http// o Water vapor water vapor in the air to become visible as a funnel cloud or condensation funnel. HYPERLINK http// l cite_note-Renno-15 16 When a funnel cloud extends halfway between the cloud base and the ground, it is considered a tornado. HYPERLINK http// l cite_note-16 17 There is some disagreement over the definition of funnel cloud and condensation funnel. According to the Glossary of Meteorology, a funnel cloud is any rotating cloud pendant from a cumulus or cumulonimbus, and thus including most tornadoes under this definition. HYPERLINK http// l cite_note-17 18 Among many meteorologists, the funnel cloud term is strictly defined as a rotating cloud which is not associated with strong winds at the surface, and condensation funnel is a broad term for any rotating cloud below a cumuliform cloud. HYPERLINK http// l cite_note-SPC_FAQ-2 3 Tornadoes often begin as funnel clouds with no associated strong winds at the surface, though not all evolve into a tornado. However, many tornadoes are preceded by a funnel cloud. Most tornadoes produce strong winds at the surface while the visible funnel is still above the ground, so it is difficult to discern the difference between a funnel cloud and a tornado from a distance. HYPERLINK http// l cite_note-SPC_FAQ-2 3 Outbreaks and families Main articles HYPERLINK http// o Tornado family Tornado family, HYPERLINK http// o Tornado outbreak tornado outbreak, and HYPERLINK http// o Tornado outbreak sequence tornado outbreak sequence Occasionally, a single storm will produce more than one tornado, either simultaneously or in succession. Multiple tornadoes produced by the same storm are referred to as a tornado family. HYPERLINK http// l cite_note-18 19 Several tornadoes are sometimes spawned from the same large-scale storm system. If there is no break in activity, this is considered a tornado outbreak, although there are various...
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