A norâeaster is a powerful storm system that impacts the eastern seaboard of North America, bringing gusty winds, coastal flooding, and heavy precipitation. Typically, these events occur during the fall and winter months when the air temperature over land is cooler than the waters of the Atlantic Ocean and the Gulf Stream. Originally, storm systems were classified as either Miller âType A" or Miller âType B" events, but the classification system has expanded to include âType C," âType D," and âType E" storm systems.