FWIW...@NWSWPC just analyzed central pressure of 957 mb at 7 a.m. EST. A 53 mb drop in 21 hours, per their analyses. #Bombogenesis definition: at least 24 mb drop in 24 hours or less. 940s mb now certainly in play. Wow. #Grayson pic.twitter.com/mXQQGTAYkz

— Jonathan Erdman (@wxjerdman) January 4, 2018