Climate Central: A powerful storm is slated to plaster southern New England with blizzard conditions, hurricane-force winds, and coastal flooding, beginning on Friday and lasting through at least Saturday. Computer models that had been vacillating on whether the storm would take shape have now come into better alignment, although they still differ on crucial details that will affect snowfall totals in big cities such as Boston, Providence, and New York City. The National Weather Service has posted blizzard watches...