The Arizona Cardinals built a beautiful new stadium in 2006 with a retractable roof, and the roof was not designed to withstand precipitation. You may have heard that it doesn't rain much in the Phoenix area.

But on Sunday, the Cardinals and Chicago Bears had a surprise.

The roof was open and that isn't usually a danger at Cardinals home games as long as it's not too hot. But in the second quarter it started to rain. There was also hail.

This was unexpected because it was a beautiful day when the game started. The Cardinals began closing the roof, but the CBS broadcast said the process took 10 minutes. So teams experienced one of the more unexpected weather disruptions of this or many other NFL seasons. The roof was closed at the end of the second quarter.

FootballZebras.com said it was the first time a retractable roof was closed during an NFL game. The website said the decision could only be made by the match referee together with football operations.

The Bears should have been okay with that. Bad weather is not uncommon in Chicago. They probably just never expected to have to dodge raindrops and hail in Arizona.