Huge whumpfs on Ellis Peak

Went for a tour up Blackwood Canyon today, to the summit of Ellis Peak. Left the car around 12:30, summited around 3:45. New snow amounts ranged from 6-8" at the trailhead, to 1 ft.+ up high. Total snow depths ranged from 12-40". We heard incredibly LOUD whumpfs at least half a dozen times, that seemed to propagate all around us, and probing revealed the obvious weak layer buried under the new snow. However, we saw no shooting cracks, or any other evidence of slab formation in the surface snow, and enjoyed excellent skiing down slopes <30 degrees. The high density snow from early in the storm provided a very supportable base topped with several inches of lower density snow, that provided great skiing with almost no hitting of rocks. Overall, a great day out.