On 17–18 January, staff from the German Aerospace Center got to compare their new Gulfstream G550 jet, dubbed HALO, with its closest counterpart—the NSF/NCAR Gulfstream V, called HIAPER, which debuted in 2005.

The surfeit of snowfalls across the U.S. East Coast over the last two winters brought ample evidence of just how much the white stuff can vary from place to place—and how difficult it is to assess accurately.