On this day in 1988 one of the most severe windstorms in years slammed through Northeastern Colorado. A strong wind gust of 92 mph blew through Boulder, CO knocking down the anemometer. At the same time, in the mountains, a wind gust of 120 mph was recorded at Mines Peak. The winds were strong enough to blow down a partially constructed viaduct that was east of Boulder, as nine un-anchored concrete girders were blown off their supports. Those concrete girders were said to have weighed forty-five tons each!