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Bomb cyclone caused destruction, heartache Five years ago, a massive low-pressure system, dubbed Winter Storm Ulmer, “bombed out” over the Great Plains, rapidly intensifying in severity as its central pressure plummeted, transforming it into extratropical “bomb” cyclone Having originated in the Gulf of Alaska on March 8th, Ulmer had moved southeast to beset California with heavy rain on March 11th, where was decreed a winter storm and given its name. As it moved into Southern California, dry desert air clashing with moisture drawn in from the gulf set the stage for its explosive intensification.