A few years back we had a rare occurance called Snow Rollers.
People in central Illinois observed a strange phenomenon February 11 and 12, 2003. Log-shaped “snowballs” showed up on lawns, fields, and other open areas. This is a phenomenon referred to as “snow rollers”. These are formed under specific weather conditions:
The ground surface must have an icy, crusty snow, on which falling snow cannot stick.
About an inch or so of loose, wet snow must accumulate.
Gusty and strong winds are needed to scoop out chunks of snow.
Snowfall of 1 to 4 inches occurred across central Illinois the morning of February 11. That evening, as a strong cold front pushed through the area, wind gusts of 40 to 60 mph were noted in many areas.
Once the initial “seed” of the roller is started, it begins to roll. It collects additional snow from the ground as it rolls along, leaving trails behind it. The appearance is similar to building snowmen, except the snowball is more log-shaped rather than spherical, and many times they are hollow. They can be as small as a golf ball, or as large as a 30 gallon drum, but typically they are about 10 to 12 inches in diameter. (NOAA)
Heres a link if you would like to see them for your self: http://www.crh.noaa.gov/ilx/ev…..roller.php