Touring up the Phantom Trees on Snoqualmie Mountain, with new snow made skinning easier than expected. As we got above 4000', snow depth increased to 4-5" and in more open areas was not bonded well to the previous layer. Roller balls started occurring from the skin track collecting snow to about 2' in diameters. As we started to pop out of the trees around 5100' we ran into a group of 3 skiers who had just skied up Snoqualmie Mountain, descended via the slot and came back up the Thunder Creek exit. They mentioned that the Slot and north facing terrain was extremely variable and that they had set off a small slab in the slot itself. They also noticed that larger roller balls were occurring across their skin track up to the top of the slot that had not been there previously. We decided to head to the top of the Thunder Creek exit and reassess our plans to head towards the slot. We ruled out continuing to travel up Snoqualmie Mountain towards the Snot/Slot but considered dropping into Thunder Creek to take a look at the Circus Couloir and/or ski out via Snow and Source Lake. While evaluting the entrance to Thunder Creek we heard the second party wooping from finishign the Slot and wintessed the first slide on the Snot described above. After watching the skiers decide to exit via Snow Lake we skied the Phantom Trees linking together the lowest angle terrain. Many roller balls getting up to 3' in size were occurring and it seemed like steeper roll overs could lead to loose wet slides.