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From 9 to 11 November 2001, intense cyclogenesis affected the northern coasts of Africaand more particularly the densely populated city of Algiers. During the morning of  10 November,more than 130 mm of precipitation was recorded at Bouzareah and resulted in mudslides which devastatedthe Bab-el-Oued district. This disaster caused more than 700 casualties and catastrophic damage.Like many other heavy rainstorms in the western Mediterranean, this event was associated withthe presence of an upper-level trough materialized by a deep stratospheric intrusion and characterizedby high potential vorticity values. In this study, the impact of this synoptic structure on thelocalization and intensity of the precipitation which affected Algiers is investigated using a potentialvorticity (PV) inversion method coupled for the first time with the French non-hydrostatic MESO-NH model.A set of perturbed synoptic environments was designed by slightly modifying the extent and the intensityof the coherent potential vorticity structures in the operational ARPEGE analysis. It is shown thatsuch modifications may have a strong impact on the fine-scale precipitation forecast in theAlgiers region, thereby demonstrating the fundamental role played by the potential vorticity anomalyduring this exceptional meteorological event

High resolution numerical study of the Algiers 2001 flash flood: sensitivity to the upper-level potential vorticity anomaly