The inversion has been parked over the Treasure Valley all week, and the National Weather Service expects it to stay through the middle of next week.
Cold temperatures are expected to continue, too, with highs below freezing until Saturday, when Boise is expected to reach a balmy 32 degrees. Without the inversion, it likely would be even colder, with temperatures below zero the past few days, according to the weather service.
There is a chance of snow flurries Thursday morning, although they probably would not be as heavy as they were Wednesday.
If you crave blue skies and sunshine, head to Bogus Basin, which sits above the inversion level. Below 5,800 feet, however, it likely will stay gray until a new weather system moves in next week, forecasters said.