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Hurricanes in the Atlantic Basin can veer to the north sooner if the cold air mass to the north is weaker.
Hurricanes tend to take the path of least resistance, much like water does. Steering currents, dry air, and wind sheer all have their effect as does temperature. All hurricanes that form in the Atlantic Basin eventually hook to the northeast. As temperatures in the Atlantic Basin warm up, cooler temperatures which would tend to keep a hurricane to the south move farther to the north, allowing hurricanes to hook to the north sooner and take a more northerly path.
A hurricane may seem to be a non-solid object but actually has a surface created by wind and pressure. To keep on a westerly path, it “bounces” off a “wall”, of sorts, although a gradational one, created by the transition from higher temperatures to the south to lower temperatures to the north. But as temperatures warm, the wall moves to the north, as does the hurricane, taking a northerly path and hooking to the northeast while still out in the Atlantic Basin.
This is one possible reason for a decrease in the number of major hurricanes that have made landfall in the past 10 years.
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