October 20, 2020 | 8:56 a.m. MDT
On Monday the Calwood Fire northwest of boulder grew a relatively small amount on the west and northwest sides. An overnight mapping flight updated the size to 9,365 acres.
On the map above the red line is the perimeter of the Calwood Fire at 9:15 p.m. MDT Oct. 19, 2020, mapped by a fixed wing aircraft. The red shaded areas represent intense heat at that time. The small black line was the perimeter about 24 hours before.