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In this study consideration is given to the po- tential use of radar-derived quantitative precipitation esti- mates (QPE) as flash flood guidance in the context of the Italian Civil Protection flood risk management system. The interest in high precipitation intensities and accumulation motivated the case study of the 26 September 2007 event, in which a quasi-stationary mesoscale convective system brought within 3-6 h 40% of the mean annual precipitation to the wider Venice-Mestre area, i.e. 260 mm in Venice-Mestre and 325 mm in closeby Valle Averto. Comparison of the radar-derived QPE in the area with the rain gauge network revealed a good correspondence for warm season rainfall, both for daily accumulations in the longterm (about 2 years) and hourly accumulations for the case under consideration. The long term average radar to gauge ratio is very close to 0 dB with an uncertainty of ap- proximately ±3 dB, i.e. roughly a factor of two, slightly bet- ter for higher precipitation intensities. For the hourly accu- mulations during this very intense event the spread is similar, while the average is slightly positive. The locations of the rainfall accumulation maximum as de- tected, respectively, by the radar and by the rain gauge net- work do not coincide. Given the relatively good quality of the precipitation estimation, it is argued that these areas ef- fectively have received even larger rainfall amounts, and that it is worthwhile to further investigate the potential of radar to be used as flash flood guidance. citizens by setting up an organization able to perform an ef- fective emergency management (Italian-Government, 1992, 2000). Within the palette of natural hazards the hydromete- orological hazard is a relatively frequent one and can con- stitute a major threat to life and property. In a relatively recent Directive of the President of the Council (Italian- Government, 2004) operational guidelines were laid out for the national and regional alert management related to the hy- drogeological and hydraulic risk. The alert system is built on concerted operations of national and regional units of Civil Protection on one side and hydrometeorological monitoring

Quantitative comparison of radar QPE to rain gauges for the 26 September 2007 Venice Mestre flood