Was MSP airport closed April 15, 2011 due to snow? Or did Delta lie?

On April 15, 2011, a Delta flight from Las Vegas to Minneapolis/St. Paul was delayed for takeoff almost 2 hrs. because, Delta says, MSP was closed due to snow removal. When my brother landed in MSP, there was a little rain, but no snow. He asked a cab driver about it, and he said there was no snow and the airport hadn't been closed. Many people missed their connecting flights due to this delay also. Why did Delta lie about this?