Avalanche forecasting relies on collecting diverse data, including but not limited to, snowpack data. The data we look for tells us about the state of the snowpack- the best data does not have to be interpreted. Things like recent avalanches, whumpfing and cracking are clear signs of instability. Whumpfing and collapsing today is a clear sign that in some areas, the snow is unstable. Since whumpfing is occurring on flat ground, low angle slopes and in some cases, slopes steeper than 30 degrees, avoid steep north facing slopes at and above treeline.