The United States' National Multi-Agency Coordination Group (MAC) establishes National Preparedness Levels throughout the calendar year to help assure that wildland firefighting resources are ready to respond to new incidents. Preparedness Levels are dictated by burning conditions, fire activity, and especially resource availability.
The five Preparedness Levels range from I to V, with V being the highest level. Each Preparedness Level has specific management directions. As the Preparedness Levels rise, more federal and state employees become available for fire mobilization if needed.