Update 9:10 p.m.
Crews have established containment lines around the North Delphia fire east of Roundup. The blaze is now listed officially at 256 acres.
According to the Musselshell County Department of Emergency Services, a skeleton crew will remain on scene for night patrol, with a full response in the morning for mop up and additional work. Residents will be allowed back in to their homes within the hour.
The North Delphia fire east of Roundup has grown to between 100 and 200 acres, and about 100 firefighters are en route, including two helicopters and single engine airtankers.
Residents are on pre-evacuation notice. Spot fires caused by the wind have caused the fire to jump the road and be on the south side of Sheepherder Trail.
Crews are busy protecting structures in the subdivision, according to the Musselshell County Department of Emergency Services.
A wildfire has sparked Saturday afternoon in the North Delphia subdivision east of Roundup.
The Musselshell County Department of Emergency Services estimated the fire around five to 10 acres at 2 p.m.
Multiple response units are at the scene, and a state Department of Natural Resources and Conservation helicopter is en route.
This is a developing story. Check back for details.
Viewer video courtesy of Kitrin Mae Crane