Climatology of severe local thunderstorms (TLS) in the Metropolitan Area of Guadalajara [Climatología de las tormentas eléctricas locales severas (TELS) en la Zona Metropolitana de Guadalajara]

The presence of severe weather phenomena (tornados, hailstorms and linear winds with destructive gusts) is related to important changes in the morphology of the thunderstorms. The thunderstorms that reach that stage are considered as a special type of thunderstorms called local severe thunderstorms (TELS). The development of TELS in the Metropolitan Area of Guadalajara (ZMG) is a reality and should be considered in the protection of society due to the losses of lives, material damages and considerable effects that happen as a consequence of these. As we don't have a chronology of TELS in ZMG it was necessary to make a compilation of them as base to their climatology. Among the results obtained is that TELS happens from May until November, but especially in the months of June, July and August. Most happen during hours of the afternoon or of the night, but not a insignificant group also happens during the dawn. It is established that TELS constitute an important element of the climate of ZMG that cannot be ignored from the scientific point of view and much less in practice, for the effects that takes place in many of them

Climatology of severe local thunderstorms (TLS) in the Metropolitan Area of Guadalajara [Climatología de las tormentas eléctricas locales severas (TELS) en la Zona Metropolitana de Guadalajara]

The presence of severe weather phenomena (tornados, hailstorms and linear winds with destructive gusts) is related to important changes in the morphology of the thunderstorms. The thunderstorms that reach that stage are considered as a special type of thunderstorms called local severe thunderstorms (TELS). The development of TELS in the Metropolitan Area of Guadalajara (ZMG) is a reality and should be considered in the protection of society due to the losses of lives, material damages and considerable effects that happen as a consequence of these. As we don't have a chronology of TELS in ZMG it was necessary to make a compilation of them as base to their climatology. Among the results obtained is that TELS happens from May until November, but especially in the months of June, July and August. Most happen during hours of the afternoon or of the night, but not a insignificant group also happens during the dawn. It is established that TELS constitute an important element of the climate of ZMG that cannot be ignored from the scientific point of view and much less in practice, for the effects that takes place in many of them

The spatial-temporal distribution of the atmospheric polluting agents during the period 2000-2005 in the Urban Area of Guadalajara, Jalisco, Mexico

In the large cities, the disordered urban development, the industrial activities, and the transport, have caused elevated concentrations of polluting agents and possible risks to the health of the population. The metropolises located in valleys with little ventilation (such as the Urban Area of Guadalajara: UAG) present low dispersion of polluting agents can cause high risk of respiratory and cardiovascular diseases. The objective of this work was to describe the spatial-temporal distribution of the atmospheric polluting agents: carbon monoxide (CO), nitrogen dioxide (NO2), sulfur dioxide (SO2), particles smaller than 10 microns (?m) (PM10) and ozone (O3) in the UAG during the period 2000-2005. A spatial-temporal distribution analysis was made by means of graphic interpolation (Kriging method) of the statistical parameters of CO, NO2, SO2, PM10 and O3 with the collected data from eight stations of atmospheric monitoring in the UAG. The results show that the distributions of the atmospheric polluting agents are variable during the analyzed years. The polluting agent with highest concentration is PM10 (265.42 ?g/m3), followed by O3 (0.11 ppm), NO2 (0.11 ppm), CO (9.17 ppm) and SO2 (0.05 ppm). The most affected zone is the southeast of the UAG. The results showed that an important percentage of days exceed the Mexican norms of air quality (93-199 days/year). © 2008