‘93 of course. Westmoreland and Fayette had them during the second (smaller) storm in February 2010. While the totals were more modest than the first one, the winds were howling. Before ‘93, it would have been one of the Jan ‘78 storms. And before that, Nov ‘50, unless one of those bigger ones in the 60’s had the criteria. But of course those days were different as far as warnings and criteria.
But I’d say that’s a quarter century type happening.