Big winter outbreaks can and have happened, 1/7 and 2/5 (Super Tuesday) '08 and December 2015 spring immediately to mind, to a lesser extent February 2016 and '17. However the persistent issues from 2018 seem to be lingering with this one, particularly poor warm-sector lapse rates despite the Gulf being wide open and with it being winter, you'd think it would be so frigid upstairs that cloud cover wouldn't matter.