BOISE, Idaho — Storms brought cooler and wetter weather into the Western and Northwestern U.S. this weekend, breaking up a temperature inversion that had blanketed much of the region with acrid smoke from dozens of wildfires.

Officials at the National Interagency Fire Center in Boise said Saturday they expected fire activity to decrease over the next several weeks. Spokeswoman Kari Cobb said air quality should improve as the smoke-trapping inversion breaks up.

“We should see it lifting more today,” she said Saturday. “It’s predicted to be mostly gone by tomorrow in most of the West.”

She said that rain and higher humidity should decrease the chances of new fires.