A substantial percentage of the total rainfall amount in Catalonia (north-east of Spain) stems from convective cloud systems. To obtain a quantitative estimate, convective events were identified on the charts of a rain-rate recorder from 1960 to 1979. Events were classified into four categories: non-convective, convective with low rainfall rates, convective with moderate to high rates and thunderstorm events. The amount of rain due to each of these was computed. The ratio of convective to total rainfall amounts ranges from 70 to 80 per cent in the summer months to less than 30 per cent in winter and its pattern through the year is discussed as regards regional weather and climate. Orographical features, potential instability of the atmosphere and high sea-surface temperatures are related to high-rate events. The uncertain character of rainfall in the area is clearly linked to the large share of convective rainfall on the bulk precipitation.
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Llasat et al. (1997) studied this question.
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