A massive wind storm with gusts up to 81 mph howled across the Midwest Tuesday, snapping trees and power lines, ripping off roofs, delaying flights and soaking commuters hunched under crumpled umbrellas.
Spanning from the Dakotas to the eastern Great Lakes, the unusual system mesmerized meteorologists because of its size and because it had barometric pressure similar to a Category 3 hurricane, but with much less destructive power.
Scientists said the storm had the force of a blizzard minus the snow.
the system's pressure reading Tuesday was the lowest ever in a non-tropical storm in the mainland U.S. If confirmed, that would be worse than the pressure that produced the Blizzard of 1978, the March 1993 "Storm of the Century" or the November 1975 storm that sank the Edmund Fitzgerald freighter, memorialized in a song by Gordon Lightfoot.
The storm blew in from the Pacific Northwest on the strength of a jet stream that is about one-third stronger than normal for this time of year, Imy said. As the system moved into the nation's heartland, it drew in warm air needed to fuel thunderstorms. Then the winds intensified and tornados formed.