This reported April 22, 2017, on the Eastern Sierra Avalanche Center website.

Avalanche on Mt Whitney Mountaineers Route

Reported at 9300' elevation, puts it in the canyon below Lower Boy Scout Lake, about the elevation of the Ebersbacher Ledges. Form the picture, it appears the slide came down into the canyon from the north-facing slope above the canyon.

Type: Wet Loose Point-release     Slope: 45 degrees     Crown Height: 1 ft.     Aspect: North
Avalanche Width: 100 ft     Avalanche Length: 500 ft     Partial burials: 2

More info:
Estimated R2-3, D2 avalanche in the initial gully of the mountaineers route up mt Whitney. Location 1.3 miles from trailhead parking, elevation 9300 ft. We encountered several groups who had been partially buried in the slide. Large 2 ft deep by 25 ft square ice boulders carried by slide. Several injuries, one requiring helicopter evacuation. Cause determined to be warning rock and running water at the base of the snowpack creating a perfect bed surface. Extremely warm conditions at around noon; guess of around 50-55 F air temps when we got there.

Two pictures: click on the pic for enlarged view

This shows the rescue helicopter, with its stretcher hoist mounted.