I've never seen any reports of avalanches in the chute below the notch. But a few years ago there were three who camped in the gully just east of Whitney's East Face -- in the low area before the last ascent to Iceberg Lk, and they were fortunate to survive after the avalanche covered their tent.
Last year was a heavy snow winter; this year is the opposite. Also, heading up from Iceberg to the Notch, most people stay on the rocks to the left of the main gully, out of an avalanche path.
Bob R once posted an avalanche map, where he identified areas where he knew of avalanches in the past, but I can't find it now. Unfortunately some people were critical because they felt it implied you were safe outside his marked areas.
From Bob R: Two ways to get up the Mountaineer's Route chute
