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Intensity change is more than just warm waters -- for instance, Kate and a couple of other storms in 1985 were helped by the presence of mid-latitude troughs to their north and west, serving to enhance their outflow and provide a means for spinning up the low-level circulation. However, having warm surface water *and* having it warm to a sufficient depth (progressively deeper for a progressively stronger storm) is perhaps the most important of all of the external factors for intensity change. |