Many in Colorado awoke to slightly smoky skies on Monday morning, but not as a result of any local wildfires. 

According to the National Weather Service, the smoke spanning across a large portion of the state can be attributed to a fire that began Sunday in Flagstaff, Ariz. 

“That smoke aloft is primarily drifting into Colorado from the Pipeline Fire near Flagstaff, AZ, which ignited yesterday,” the weather service wrote in a tweet on Monday morning. 

The Pipeline fire was reported at 10:15 a.m. Sunday. The fire is located about six miles north of Flagstaff and burned 4,500 acres as of early Monday, according to information from InciWeb. 

The weather service anticipates the smoke to stretch across Colorado throughout the week, and that while early in the day the smoke will be elevated, hotter temperatures later in the day could lead to the smoke being closer to ground level. 

With temperatures expected in the 90s and triple digits in parts of Colorado this week along with and high winds, much the state is under a red flag warning for high fire danger.