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Initial location: Mission Boulevard and Crestmore Road, Jurupa Valley, Riverside County, Calif.

Mission Fire initially started 4:03 p.m. Oct. 18 in Riverside County.

After being active for 17 hours, it has burned 17 acres. A crew of 100 firefighters succeeded in containing 75% of the fire by Saturday morning. The cause is, however, still being investigated.

15 engines, one water tender, two dozers and four hand crews are working to suppress the fire. According to Cal Fire, "Numerous firefighting air tankers from throughout the State are flying fire suppression missions as conditions allow."

#MissionFire [10/19 UPDATE 8:15 A.M.] The fire is 17 acres and 75% contained.

Containment indicates what percentage of the fire perimeter has been surrounded by a control line. In this case, it means that 75% of the wildfire is halted from spreading, while 25% 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.