Data Class	Information Category	Observations Made	Red Flag Values	Your Observations
Weather	Precipitation	Type	Rain/heavy wet snow
		Intensity	>3 cm / hr
		Accumulation	>30 cm/ 12 hr
	Wind	Speed	Strong enough to move snow
		Direction	Moving snow onto/across route
		Duration	Long
	Temperature	Current	≥ 0◦c
		Maximum	≥ 0◦c
		Minimum	≥ 0◦c
		Trends	Rapid change
	Solar radiation	Cloud cover	Allowing a lot/ intensifying
		Intensity	Strong
		Duration	Long
Snowpack	Snow Cover	Height	< 1.5m
		Strength	Weak
		Variability	High
	Layers	Strength	Strong over Weak
		Temperature	Near/= 0◦c
		Grain Characteristics	Large, loosely packed, angular grains
	Bonding	Strength	Compression test ≤20 Rutschblock ≤4
		Plane Characteristics	Smooth, Clean
		Failure Layer	Large, loosely packed, angular grains
	Whumping	Initiation	Natural/Human Trigger
		Propagation	Far (>3m)
		Extent	Widespread
Avalanche Activity	When	Current	Observed
		Recent	<24 hr (Maritime climate) <48 hr (Continental)
		Past	If condition still exists
	Where	Area	Widespread
		Terrain Type	Similar to route
		Terrain Traps Angle/Aspect	Traps exist where avalanches are running
	What	Natural Triggers	All Natural Triggers
		Human Triggers	All Human Triggers
	How	Destructive Potential	≥ Class 2
		Propagation	Wide fracture lines running far
		Failure Layer	Large, loosely packed, angular grains