Why are we seeing a big NW trend for this winter storm in the NE US?
— Eric Webb (@webberweather) December 15, 2020
A shortwave over the midwest (circled in 🔴) is digging deeper into the base of a longwave trough over the central US, forcing downstream amplification of a ridge near the US E coast >> storm lifts northward. pic.twitter.com/4RZblDvB4f