Hellroaring Drainage; "Huge whoomphs"

"I was in the Hellroaring Drainage Yesterday, snow depths below 7,000' hover around 18", around 8,000' snow depths increase significantly but are still shallow i.e. less than 30". Witnessed the largest "whoomphs" I have ever felt (that's saying something since last Decemeber/Jan was horrendous), interestingly much of this was felt returning on the same skin track , telling me this is a stubborn layer that may not give right away. The largest was a collapse in a meadow nearly 0.25 miles long."