I remember the 4/26/00 event too. Terribly forecasted IIRC. Had 2-3" in ORH county. Surprise ULL.
Those Lowell numbers are prob way lowballed in '87 and '77 though....but that coop I think typically only measured once per day, so that time of the year if you miss the measurement at the end, then you'll prob be measuring melting slush hours later.