(ANSA) - ROME, MAR 13 - An anticyclone that has brought mild and sunny conditions to Italy is weakening, driven by a new low pressure system that will bring widespread rain, heavy snowfall in the mountains, and a drop in temperatures across Italy, according to Lorenzo Tedici, meteorologist and media director for iLMeteo.it. "Today," he says, "the weather will be unstable but mild." Starting tomorrow, the first significant drop in temperatures is expected in the Northwest, before plummeting ac...