BOULDER, Colo. -- Police in Boulder are looking for a 13-year-old girl who left her home in freezing temperatures.

Elizabeth Vannoy has not been seen since Friday, said Julie Brooks of the Boulder Police Department.

She was last seen by her grandmother at about 1:15 p.m. at her home in north Boulder, Brooks said.

Police said there is no reason to issue an Amber Alert, but said they were concerned because of her age and that she left her home in freezing temperatures and did not take her cell phone.

Vannoy is described as a white teen, about 5 feet 5 inches tall weighing 100 pounds. She has blue eyes and brown hair with a red tint, Brooks said.

Police said they believe she may be in the Boulder area, possibly around the Pearl Street Mall or in Broomfield near the Flatiron Crossing Mall.

Vannoy has also gone by the names of Beth, Elizabeth, Kat and Kat Montez.

Anyone with information is asked to contact Boulder police at (303) 441-3333.