DENVER (CBS4) – Flight schedules are slowly getting back to normal at Denver International Airport after the violent weather caused a ground hold.

The FAA called the ground hold at when a severe storm came through and brought heavy rain, lightning and hail. There was so much hail on the runways that crews had to use snowplows to clear them off.

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(credit: Denver International Airport)

(credit: Denver International Airport)

The ground hold kept flight crews indoors and out of harm’s way.

Many flights going into DIA and coming out were delayed due to the hold, and a few flights had to be canceled.

Approximately 130 outgoings planes were delayed, some by as much as 3 hours. Some flights also had to be diverted to other airports.

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Airport passengers who drove in to the airport told CBS4 the ride along Pena Boulevard was loud, with all the hail hitting their cars and the road.

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According to FlightAware.com, DIA was the worst airport for delays in the country on Thursday.