<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2007-3380</journal-id>
<journal-title><![CDATA[Revista bio ciencias]]></journal-title>
<abbrev-journal-title><![CDATA[Revista bio ciencias]]></abbrev-journal-title>
<issn>2007-3380</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma de Nayarit]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-33802020000100324</article-id>
<article-id pub-id-type="doi">10.15741/revbio.07.e885</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Analysis of severe storms and tornado formation in the northern region of Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Análisis de tormentas severas y formación de tornados en la región norte de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pineda-Martínez]]></surname>
<given-names><![CDATA[L. F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León-Cruz]]></surname>
<given-names><![CDATA[J.F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carbajal]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Zacatecas  ]]></institution>
<addr-line><![CDATA[ Zacatecas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Potosino de Investigación Científica y Tecnológica División de Geociencias Aplicadas ]]></institution>
<addr-line><![CDATA[ S.L.P.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>7</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-33802020000100324&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-33802020000100324&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-33802020000100324&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This work presents an analysis of extreme rainfall and its trends for the northern region of Mexico. Based on one-day and five-day maximum rainfall events, the sites with the highest incidence of severe storms can be estimated and related to a tornadoes database. The northern and northwestern regions of Mexico are characterized by their high influence of monsoon summer rains, this generates days with heavy rains as storms with more than 20 mm/day. However, the report of tornadoes in that region is relatively low with respect to the central and southeastern zones of the country. App lying the indexes of the Expert Team on Climate Change Detection and Indices (ETCCDI) for climatic stations of the National Meteorological Service, homogeneously distributed in northern Mexico, the indexes were calculated for days with intense precipitation RX1day, RX5day, R95P and SDII. Additionally, an analysis of the spatial-temporal variation of instability zones is performed based on K and Gálvez-Davison indexes. The main objective was to associate events of extreme rain with tornadic activity, and where appropriate, observe favorable conditions for the development of tornadoes in that region, and in this way, obtain conjectures if this &#8216;gap&#8217; in the information is mostly associated to the lack of reports.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Basado en eventos de lluvia máxima a 1-día y 5-días se puede estimar los sitios de mayor incidencia de tormentas severas, y relacionar con la base de datos de tornados. La región del norte y noroeste de México se caracteriza por tener una alta influencia de las lluvias monzónicas de verano, esto genera días con fuertes lluvias en forma de tormentas mayores a los 20 mm/día. No obstante, el reporte de tornados en esa región es relativamente baja con respecto a la zona centro y sureste del país. Aplicando los índices del Grupo de Expertos en Detección e Índices de Cambio Climático (ETCCDI) para estaciones climáticas del Servicio Meteorológico Nacional, distribuidas de manera homogénea en el norte de México, se calcularon los índices para días con precipitación intensa RX1day, RX5day, R95P y SDII. Adicionalmente se realizó un análisis de la variación espaciotemporal de zonas de inestabilidad a partir los índices K y Gálvez-Davison. El objetivo principal es asociar eventos de lluvia extrema con actividad tornádica, y en su caso, observar condiciones favorables para el desarrollo de tornados en esa región, y de esta manera, obtener conjeturas si éste &#8216;gap&#8217; en la información esta mayormente asociado a la falta de reportes.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Severe Storms]]></kwd>
<kwd lng="en"><![CDATA[Tornadoes]]></kwd>
<kwd lng="en"><![CDATA[Northwest Mexico]]></kwd>
<kwd lng="en"><![CDATA[Detection Indexes]]></kwd>
<kwd lng="en"><![CDATA[Instability Indexes]]></kwd>
<kwd lng="es"><![CDATA[Tormentas severas]]></kwd>
<kwd lng="es"><![CDATA[Tornados]]></kwd>
<kwd lng="es"><![CDATA[Noroeste de México]]></kwd>
<kwd lng="es"><![CDATA[Índices de detección]]></kwd>
<kwd lng="es"><![CDATA[Índices de inestabilidad]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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