This is a good advance, IMO. Here's a link to the full release which shows that RAOB and commercial aircraft data will be added as well: https://www.weather.gov/media/notification/pdf2/scn20-46rapv5_hrrr_v4aab.pdf
*Time Sensitive*
Rt. 30 @ MD line in NE Carroll County has steady snow: https://chart.maryland.gov/video/video.php?feed=a5ffabd8008200d30050fa36c4235c0a
Ever so slightly optimistic about December. This time last year it was looking like lights out through January. Even seasonable conditions would be an improvement.
Essentially HM is saying the perturbation of the jet stream is going to put us in a more favorable for high latitude blocking in the North Atlantic as we enter December. It's not set in stone, but it's better than what the past 2 winters have shown.