A nationwide weather data outage disrupted Southwest Airlines flights Monday night, causing long delays for some passengers across the country. The company blamed the problem on issues with Southwest's third-party weather data provider.

A company spokesman for Southwest told NPR the system "experienced intermittent performance issues" that prevented weather information from being sent to flight crews. That information is required to safely operate the plane, Dan Landson with Southwest Airlines said in an email.

"While Southwest Teams and the vendor worked to restore connectivity, we implemented a ground stop to protect the safety of our crews and customers," Landson said.

It appears the system went down roughly around 9 p.m. EST. By midnight, the airline said it was able to resume some flight operations.

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