Don't believe the hype. People put too much stock in this. A moderate El Nino usually means a 100cm snow difference over the course of a season and maybe 1-2 degree temperature on average at the most. Same with La Nina in the opposite direction.
2015/2016 was an uber El Nino, much stronger than what is forecast for this season and we still had over 10m of snow on the resort; meanwhile the Okanagan ski resorts closed with an above average snowpack. The only difference for RMR was the season on the lower mountain was short and there wasn't much snow in town.