When the fracture of a lower snow layer causes an upper layer to fall or collapse, making a whumpfing sound. This an obvious sign of instability. See Collapse.
Menu
Whumpf:

Whumph has actually been adopted as a technical avalanche term to describe the sound of a collapsing snowpack when you cross the snow. For instance, “we got a lot of whumphing today,” or “the snowpack whumphed like rolling thunder just before it released and caught us.” This is the sound of nature screaming in your ear that the snowpack is very unstable. Most snowpacks collapse onto a “persistent” weak layer such as faceted snow, depth hoar or surface hoar, although occasionally whumphing occurs on very wet snowpack as well.

Additional Terms:
Anchors Hard Slab Avalanche Slide
Aspect High Danger Sluff
Avalanche High Marking Snowpit
Avalanche Path Isothermal Soft Slab Avalanche
Avalanche Transceiver Layer, Snow Stability
Bed Surface Leeward Stability Test
Collapse Loading Starting Zone
Concave Slope Loose Snow Avalanche Stepping Down
Considerable Danger Low Avalanche Hazard Sun Crust
Convex Slope Melt-Freeze Snow Surface Hoar
Cornice Metamorphism, Snow Sympathetic Trigger
Corn Snow Moderate Danger Temperature Gradient
Couloir Persistent Weak Layers Terrain Trap
Cross Loading Point-Release Track
Crown Face Probe Trigger
Danger Ratings Propagation Trigger Point
Deep Slab Avalanche Rain Crust Upside-Down Storm
Density, Snow Remote Trigger Weak Layer
Depth Hoar Rime Weak Interface
Dry Snow Avalanche Runout Zone Wet Snow Avalanche
Extreme Danger Sastrugi Windward
Faceted Snow Settlement Wind Loading
Fracture Ski or Slope Cut Wind Slab
Glide Skinning, Skin Track Whumpf
Graupel Slab  

 

michael kors black friday michael kors black friday michael kors Black Friday michael kors Black Friday north face cyber monday michael kors black friday canada goose cyber monday beats by dre black friday north face cyber monday Juicy Couture cyber monday canada goose black friday beats by dre black friday Juicy Couture cyber monday beats by dre black friday canada goose cyber monday beats by dre cyber monday Juicy Couture cyber monday canada goose cyber monday north face cyber monday michael kors black friday coach black friday coach black friday north face black friday beats by dre black friday canada goose black friday uggs black friday canada goose cyber monday coach black friday canada goose black friday lululemon black friday hollister cyber monday Juicy Couture cyber monday hollister black friday hollister black friday canada goose cyber monday Juicy Couture black friday michael kors cyber monday michael kors cyber monday canada goose black friday uggs cyber monday beats by dre black friday kate spade cyber monday beats by dre cyber monday beats by dre black friday lululemon cyber monday uggs black friday