Abstract
AMERICAN METEOROLOGICAL SOCIETY | 1229 On 9–10 November 2001, Algeria was struck with its most devastating f lood since records were first kept in 1908 (Fig. 1). The f lood was caused by an intense meso-β1-scale cyclone that struck the west side of the city of Algiers, producing accumulated rainfall up to ~285 mm and onshore winds of ~33 m s−1, resulting in some 740 deaths. Fortunately, the overall cyclogenesis event was detected by the European Centre for Medium-Range Weather Forecast (ECMWF) model, enabling the Office National de la Meteorologie de Algier (ONMA) to issue a f lood forecast as early as 5 November. Whereas the apparent predictability of the event suggests a controlling role by large-scale forcing, closer examination reveals that significant mesoscale development led to the actual weather pattern within the Algiers locale.
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