GRAND RAPIDS, MI -- Winds as high as 100 mph -- not a tornado -- were believed responsible for storm damage that ripped a roof off an apartment building and toppled trees and poles in a 50-mile swath.

National Weather Service meteorologists released an analysis of the storm damage Thursday, Sept. 12.

The damage swath extended from Walker to the Lake Odessa area, with significant damage in the Belknap Lookout neighborhood just north of I-196 near Coit Avenue.

It was there that winds may have approached 100 mph, officials said. In other areas of the storm path, the winds likely ranged from 65-80 mph.

The analysis, based on a survey of storm damage, showed little evidence of “lofted debris” typical of a tornado, meteorologists said. They acknowledged that “brief swirls" likely occurred at points in the path.

There have been no reports of injuries from the storm, which cut through Grand Rapids about 8 p.m. and continued southeast.

Some roads, particularly in the Ada area, were left impassable because of downed trees and power lines.