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The most important hail event recorded in the region of the Ebro Valley (NESpain) in 2004 was the 11 September episode. Large hailstones (some of themwith a diameter of over 30 mm) caused important damages in agriculture andproperties. The hail event affected an area of 3848 ha and was caused byseveral multicellular systems. The aim of this paper is the analysis of theassociated convective structures using the meteorological radar as well asthe MM5 mesoscale model, thermodynamic data and a hailpad network. Toachieve this end, the new hailstorm analysis tool RHAP (Rainfall events andHailstorms Analysis Program) has been applied. It identifies tracks andcharacterises precipitation systems and convective cells, taking intoaccount 2-D and 3-D structures. The event has also been studied with theTITAN software (Thunderstorm Identification, Tracking, Analysis andNowcasting) in an attempt to compare both methods. Results show that theepisode had a strong convective activity with CAPE values over 4000 J/kg andwith hail-forming cells characterised by VIL (Vertical Integrated Liguid)exceeding 40 kg/m<sup>2</sup>, VILD (VIL density) over 4 g/m<sup>3</sup>, HP (HailProbability) of 100% and SHP (Severe Hail Probability) of over 75%.The hail cells evolved into multicellular systems that lasted between 70 and90 min. Finally, the comparison of RHAP and TITAN has shown significantcorrelations between methods

Study of 11 September 2004 hailstorm event using radar identification of 2-D systems and 3-D cells