Wall Street has a new risk on its radar: Hurricane Joaquin. The Category 4 hurricane, now pummeling the Bahamas, is the first major storm to threaten the U.S. East Coast since Superstorm Sandy devastated New York and New Jersey in October 2012. Joaquin’s trajectory is still uncertain – it could yet cut a path out to sea – but New York’s financiers are aiming to keep trading should it strike early next week.