Which of the following triggers an update to the ROC?

• A. Change in rate of spread
• B. Fire is threatening structures
• C. Change in fire intensity
• D. All of the above

Answer: (D)

ROC is a dynamic forecast of how fast the fire will move, and it must be revised whenever the factors that control spread change. If the rate at which the fire is moving changes, the spread prediction needs updating to stay accurate. When the fire begins to threaten structures, protection priorities shift and the expected behavior of the fire can change, prompting an ROC update to reflect new risk and tactics. A change in fire intensity affects flame length, spotting potential, and preheating of fuels ahead of the fire, all of which can alter how quickly the fire spreads. Because each of these situations can alter fire behavior and growth, ROC updates are triggered by all of these factors.