Occurrence of Anticyclonic Tornadoes in a Topographically Complex Region of Mexico

Author:

Carbajal Noel1ORCID,León-Cruz José F.1ORCID,Pineda-Martínez Luis F.2ORCID,Tuxpan-Vargas José1ORCID,Gaviño-Rodríguez Juan H.3ORCID

Affiliation:

1. División de Geociencias Aplicadas, Instituto Potosino de Investigación Científica y Tecnológica A.C., San Luis Potosí, SLP 78216, Mexico

2. Unidad Académica de Ciencias Sociales, Universidad Autónoma de Zacatecas, Zacatecas, ZAC 98066, Mexico

3. Centro Universitario de Investigaciones Oceanológicas, Universidad de Colima, Manzanillo, COL 28860, Mexico

Abstract

Tornadoes are violent and destructive natural phenomena that occur on a local scale in most regions around the world. Severe storms occasionally lead to the formation of mesocyclones, whose direction or sense of rotation is often determined by the Coriolis force, among other factors. In the Northern Hemisphere, more than 99% of all tornadoes rotate anticlockwise. The present research shows that, in topographically complex regions, tornadoes have a different probability of rotating clockwise or anticlockwise. Our ongoing research programme on tornadoes in Mexico has shown that the number of tornadoes is significantly higher than previously thought. About 40% of all tornadoes occur in the complex topographic region of the Trans-Mexican Volcanic Belt. Data collected (from Internet videos) on the rotation of tornadoes formed in this region showed that about 50% of them rotated in a clockwise direction, contradicting tornado statistics for most of North America. Time series of the helicity parameter showed that tornadoes formed in topographically complex areas exhibited different behaviours compared to those formed in plains that are related with supercell systems.

Funder

Consejo Nacional de Ciencia y Tecnología

Publisher

Hindawi Limited

Subject

Atmospheric Science,Pollution,Geophysics

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