During winter and early spring, New Jersey in some years is subject to "nor'easters"—significant storm systems that have proven capable of causing blizzards or flooding throughout the northeastern United States. Hurricanes and tropical storms, tornadoes, and earthquakes are relatively rare. The Kittatinny Valley to the north of Newton, part of the Great Appalachian Valley, experiences a snowbelt phenomenon and has been categorized as a microclimate region known as the "Sussex County Snow Belt." This region receives approximately forty to fifty inches of snow per year and generally more snowfall that the rest of Northern New Jersey and the Northern Climate Zone. This phenomenon is attributed to the orographic lift of the Kittatinny Ridge which impacts local weather patterns by increasing humidity and precipitation.