Updated: 10:03 p.m. July 20

First discovered: 20 hours ago, 1:40 a.m. July 20

Initial location: Off Sand Creek Rd, near the Yolo & Colusa county border, Calif.

Fire unit: Cal Fire Sonoma-Lake-Napa Unit

Fire type: Wildfire

Fire name: Rumsey Fire

Rumsey Fire initially started today at 1:40 a.m. off Off Sand Creek Rd, near the Yolo & Colusa county border in Yolo County, California.

By Monday evening, it had ravaged 450 acres. As of Monday evening, the fire crew succeeded in containing 10% of this fire. Currently, details about the cause of the fire are unknown.

Fire containment

What does it mean for a fire to be 10% contained?

Containment indicates what percentage of the fire perimeter has been surrounded by a control line. In this case, it means that 10% of the wildfire is contained from spreading, while 90% is still uncontrolled.

Containment is part of a larger plan for managing a wildfire. It is normally expressed as a percentage and it refers to how much of the fire perimeter has been surrounded/enclosed by a control line that firefighters create. The containment percentage indicates a certain level of control, but it doesn’t always correlate to safety level. Also, it’s important to note that containment doesn’t mean a fire is out.

How is containment measured?

The incident’s central command constantly receives progress reports from firefighters on the ground. As the fireline is constructed, inspected or reinforced, mappers record those details to adjust the containment percentage. The percentage tells the public how much of the fire perimeter is believed to not go beyond the control lines.

Source: Cal Fire