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.
Firefighters have been successful in slowing the spread of the Lefthand Fire which has burned 470 acres 11 miles west of Boulder, Colorado. After it was reported at 12:41 p.m. October 18 it was attacked aggressively with what was described by the Operations Section Chief as “a million dollars worth of retardant”. In spite of the brisk winds, strong work by the aircraft and personnel on the ground kept it from becoming a second major fire in the Boulder area, along with the Calwood Fire northwest of the city.
On Monday the fire was largely above the inversion layer, so aircraft were used extensively to assist ground crews. Firefighters are constructing containment lines with the assistance of aircraft when possible.
Investigators have determined that the 3,450-acre Range Fire at Orem, Utah was started by target shooting at the police department’s gun range on the east side of the city. The police officer who was present is cooperating with investigators.
From the Incident Management Team, Monday, October 19, 2020:
“Fire activity on the Range Fire was minimal overnight, growth was significantly slowed by natural features. Firefighters completed a successful burn out operation last night to secure the southeast corner of the fire. Today, firefighters will be constructing hand line directly along the western perimeter of the fire. Crews will continue to mop up along the heel of the fire. Aircraft will assist ground resources by dropping water on hot spots as needed in areas where the terrain is too steep for firefighters to safely access.”
Resources assigned include 6 hand crews, 14 fire engines, and 6 helicopters for a total of 150 personnel. The estimated cost to date is $300,000.