The storm near Columbus last week that killed 2 people and injured 4 has been ruled a "microburst". A microburst is a localized band of straight line winds. A fast gush of air gets dropped from a thunderstorm cloud, hits the ground, and then spreads out. Microbursts can produce damage as bad or worse than a tornado in some cases, and is a huge issue pilots have to occasionally deal with.
Here is a link to the National Weather Service's full report: