Resumo

HERNANDEZ CERDA, María Engracia; VIDAL ZEPEDA, Rosalía  e  GARCIA, Enriqueta. Situaciones de tiempo en el noroeste de México. Estudio de caso: el verano 1990. Invest. Geog [online]. 1999, n.39, pp.7-39. ISSN 2448-7279.

This paper determines the causes of precipitation during the rainy half of the year in Northwest Mexico, by identifying the weather systems in the area during selected days in the period May to October, 1990. The identification is made by using the satellite weather images, the synoptic weather charts and daily rainfall amounts. The summer 1990 pluviosity degree Is determined by comparing its rain ammounts, with the historic time series of precipitation by using the probable error and by calculating the monthly rain anomalies.

Palavras-chave : Precipitation; Northwest Mexico; summer 1990; anomalies.