Excess rainfall in the summer 2011, risk phenomenon in Transylvania, highlight precipitation quantities that in the warm season become more abundant due to general circulation intensity of the atmosphere, as well as to the increasing role of thermal convection that develops in unstable air masses, which is also reflected in the amount of precipitation. In summer months, the most abundant rainfall falls due to thermal convection in most cases. Excess rainfall may be present in any season of the

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... ear. They are emphasized by the largest amounts of annually, monthly precipitation, by the absolute maximum amounts of precipitation in 24 hours, by the frequency of heavy rains and the days that exceed 10 l /m 2. We can say that the excess rainfall often lead to destruction and unimaginable damage.