The Cheyenne Office of the National Weather Service is warning about dense, heavy fog this morning, especially between Cheyenne and Laramie.

The service issued this statement Thursday morning:

"Areas of dense fog will continue to hang on to parts of I-80 and I-25 this morning. Dense Fog Advisories are in effect until 9 am MDT for visibilities less than 1/4 (quarter) mile. Use caution if driving. Fog should begin to clear by 9 am this morning."