I haven't looked at the specific dates for those years in particular but despite it being difficult for snowfall in N TX, it's even more difficult during La Nina unless you get some sort of an anomalous pattern earlier this season (more El Nino like) or we are in the right place right time during some sort of pattern transition. Plus as you know there are other factors as well such as SSWs which can throw a wrench in things. Either way, near term, not looking great as synoptics are finally settling into more of a La Nina regime.