The storm shown here stretches west to east from Newfoundland to Portugal. Its southern tail (cold front) extends into the Caribbean and the north side of its comma head touches southern Greenland.
Not only is it big, but it’s also super intense – comparable to many category 3 hurricanes. The storm’s central pressure, as analyzed by the Ocean Prediction Center, is 953 mb. Estimated peak wave heights are around 25-30 feet.
For the rest of the story: http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2013/03/28/incredible-storm-spans-atlantic-ocean-coast-to-coast/