Winter damage can be hard to map in deciduous forests as in winter, illumination is low, snow affects either the baseline or post-storm image quality and there are fewer indicators of canopy damage when deciduous leaves are not present.  The highly destructive ice storm from Jan. 26-28, 2009 is challenging to map, particularly for areas with low and moderate structural damage. 

In portions of the affected region, HiForm's growing season 2008 to 2009 NDVI change reveals remarkable damage to uplands from ice accumulation. Damage was particularly acute on Arkansas' Ozark - St. Francis National Forest as shown here.