I don’t think this is a climate change story, on the other hand. There is a good scientific basis for the expectations that hurricanes should increase in intensity as the climate warms, and change in some other ways. But there’s no indication from existing climate science that they should start forming more often during winter (or even more often altogether). While I wouldn’t rule out anything categorically – all weather systems now are occurring in a climate altered by human influence, after all – there’s a better case that these January storms are attributable to what climate scientists call “natural variability.”
Winds balanced by the Coriolis and Pressure Gradient forces. An air parcel initially at rest will move from high pressure to low pressure because of the pressure gradient force (PGF). However, as that air parcel begins to move, it is deflected by the Coriolis force to the right in the northern hemisphere (to the left on the southern hemisphere). As the wind gains speed, the deflection increases until the Coriolis force equals the pressure gradient force. At this point, the wind will be blowing parallel to the isobars. When this happens, the wind is referred to as geotrophic.
Scientists take weeks or months to conduct intricate studies, using computer simulations, to see if a storm was worsened by man-made climate change. There have been a limited number of hurricanes since record-keeping began in 1851, which makes it difficult to do robust statistical analyses. However, scientists have long said future global warming would make some of the worst storms stronger and wetter and recently have linked climate change to future rapid intensification of storms. There’s been scientific debate over whether global warming means more storms, but the stronger and wetter is generally accepted by scientists.