The National Weather Service has issued a tornado warning for West Central Weld County and East Centrla Larimer County until 1 p.m. today.
A tornado already has touched down in Gilcrest and Milliken, and there are reports that the storm has caused heavy damage near Promontory in west Greeley.
The Weather Serivce tracked a large tornado three miles southwest of the New Windsor reservoir, eight miles east of Fort Collins.
The National Weather Service reports that the safest place to be is in the basement. Get under a work bench or other piece of sturdy furniture. If there is no basement, seek shelter on the lowest floor of the building in an interior hallway or room such as a closet, the Weather Service reports.