Historical El Nino in Vancouver from Environment Canada:
Winter Heating Degree Day Percent Departure From Normal:
Winter Temperature Departure From Normal:
Winter Precipitation Percent of Normal:
1998 Temperature Departure From Normal:
http://www.smc-msc.ec.gc.ca/education/elnino/canadian/region/index_mean_e.cfm?region=all#regional
I wouldn't be tooooo concerned about El Nino unless it's an extreme event, which is unlikely.
Remember that Chinook winds in Calgary and environs raised the temperature up to around 20 C during the Calgary Olympics. And that was certainly disconcerting back then. But everything worked out.