His knee went out on live TV, but FOX 9’s Keith Marler carried on like a weather warrior

It was early — very early — on a Monday in early January and Keith Marler needed to update the FOX 9 Morning News viewers about the snow. He was moving as fast as he could, which wasn’t fast — his left knee had started acting up over the holidays and his right knee had begun to feel off, too. Then, as the meteorologist was walking toward the weather map’s green screen at 6:19 a.m. on Jan. 8, …