Snowpress has been identified as one of the leading forest health factors in young plantations, particularly on lodgepole pine and Douglas-fir in the Interior Cedar Hemlock (ICH) and Engelmann Spruce Subalpine Fir (ESSF) zones.
Trees with smaller diameter, in dense stands, or with stem or root disease are most vulnerable. Snow accumulation and compression may cause basal decay or discolouration of seedlings. Hail damage symptoms consist of stripped branches, stem lesions, and scars and bruises on the upper surface of branches.
Broken branches and stems may results in growth reduction and provide a point of entry for disease. Severe stem damage may result in mortality or broken leaders. Red alder is especially susceptible to breakage from ice, snow or hail. Foliated trees may incur more damage.