The snowfall forecast has intensified throughout the day on Tuesday, with much of the I-25 corridor having the potential for more than 18 inches of accumulation between Wednesday morning and Friday.

Some of the heaviest totals are set to fall along the Continental Divide and the I-25 corridor. Those traveling across the state on I-70 or traveling along I-25 during the period of the storm should proceed with caution. Roads are expected to become extremely dangerous and travel may become nearly impossible. Thursday is expected to be especially problematic.

Here’s a look at how likely 18 inches or more of snow is on a city-by-city basis, according to the National Weather Service:

Aspen: 0 percent chance

Bailey: 71 percent chance

Boulder: 44 percent chance

Castle Rock: 57 percent chance

Colorado Springs: 25 percent chance

Denver: 34 percent chance

Estes Park: 43 percent chance

Fort Collins: 0 percent chance

Grand Junction: 0 percent chance

Pueblo: 0 percent chance

Silverton: 31 percent chance

Steamboat Springs: 0 percent chance

Walsenburg: 40 percent chance

Westcliffe: 19 percent chance

Winter Park: 90 percent chance

Follow along on the National Weather Service website for the most up-to-date information.