7/10/89 While I didn't experience the tornadoes first-hand, I did see the extreme damage done to Mohawk Mountain.
You could see it's path for many years afterward.
Saddleback 4/14/07 A day before closing day and just before the start of the 4/14 - 17 Nor'easter. This remains the most snow I've ever seen in April. Previously I'd seen a few inches of snow here and there, but not feet. Saddleback closed on 4/15/07 with a 60" base.
Different skiing experience here, March was epic in the Catskills, really deep powder. Sugarloaf closed on 4/28 with 100% of the mountain still ski able.
I've skied and seen it snow all 12 months in the Northern Hemisphere. I've seen Summer snow at Arapahoe Basin in June, July snow at Timberline Lodge, August Snowfall at Stubital in Austria and September Snowfall in Iceland.
11/23/89
4" of snow at my parents house in Bayside. I drove to my friends house in Dix Hills for Thanksgiving dinner and right into the storm. Near zero visibility and heavy snow. My car nearly went off the road.
NYC broke it's snowfall record with that storm. I'd take that Winter again in a heartbeat. Snowfall from November to April. Fantastic skiing nearly all season long. Snowfield skiing at Sugarloaf in January, waist deep powder skiing in March at Plattekill and Bobcat. Sugarloaf closed on 4/29 with top to bottom coverage and no bare spots. Nasty January thaw though.
My second coldest skiing weather.
1/16/09
-24F with the car thermometer in Stratton, Maine.
Sugarloaf summit was -35F, skiing with any speed was painful.
This article mentions the 95" of snow at Sugarloaf in 3 weeks. We skied Saddleback on closing day in 2007 and they had 60" at the base. That's a once in a lifetime snow event. I doubt I'll ever see more snow in April ever again.
http://checkinwithcharlie.bangordailynews.com/2017/04/14/home/patriots-day-storm-10-years-ago-sunday/
4/18/07 The day after the Nor'easter ended. Snowcats dug out the Timberline Lift, easily 10-15' snow depths at the summit. Just incredible amounts of snow for late April.