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While nocturnal offshore precipitation, which
produces rain cells and bands, has been studied in tropical
areas, few studies have analyzed the occurrence of this
phenomenon at higher latitudes. Using radar reflectivity,
nocturnal rainfall in the western Mediterranean area has
been detected near the coast of the Iberian Peninsula and
North Africa. More than 50 events have been recorded
since 2009. MM5 mesoscale simulations of some of the
recorded events allow us to establish that the most likely
causes for these precipitation events are: (1) the interaction
between cold air masses conducted by drainage and kata-
batic winds, and (2) a wetter and warmer synoptic wind.
Two different episodes are presented: one in the north-
eastern Iberian Peninsula, caused by stratiform clouds,
which occurred at the mouths of three rivers; the other
case, produced by convective clouds, occurred at the
southern Iberian Peninsula and was caused by the drainage
winds flowing down from some mountain ranges located close to the coast.
CitacióMazon, J.; Pino, D. Nocturnal offshore precipitation near the Mediterranean coast of the Iberian Peninsula. "Meteorology and atmospheric physics", 12 Desembre 2012, vol. 118, núm. 3-4.