Here's a loop of potential temperature on the DT. It starts with GFS analyses to its 168hr forecast from 12/17 to 12/29. Watch how the TPV/west -NAO block work across the pole towards the Bering Sea. The same Davis Strait Block could emerge on the Pacific Side! pic.twitter.com/BGt1JIY4YV

— Anthony Masiello (@antmasiello) December 23, 2019