engleski

A case analysis of heavy rainfall causing flash floods

The whole area of Mount Medvednica and the surrounding lowland including the zagreb city area experienced extensive rainfall on 3 to 4 July 1989 causing flash floods. Daily precipitation amounts measured at 0600 UTC on 4 July were in proportion to the mean monthly totals of july for this region. The maximum rainfall amounts for periods of 2 to 12 hours recorded during this storm, had a return period greater than one hundred years in this region. They were produced by a mesoscale convective system along the slowly moving frontal zone lying over north-western Croatia. The interaction between mesoscale processes and the synoptic scale development led to the intensive transformation of the initial air masses at the frontal lineinto those with a much stronger convective potential.

short-term rainfall; heavy raifall; Gumbel distribution; mesoscale rainfall system; Zagreb area; Croatia

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