The Boise area will continue to experience persistent, chilly conditions this weekend under high pressure, according to the National Weather Service in Boise, ID. A temperature inversion and stagnant air in the valleys will lead to little change in temperatures until Monday, when gradual warming aloft is expected. While mountains will see some warming, lower valleys and basins will remain cold, with temperatures expected to dip even further in McCall. The lack of wind will keep air stagnant, and fog may expand into the Snake Plain and Weiser Basin. Expect similar conditions into early next week, with some possible changes by Thursday.