Daily burn approvals depend on several critical factors: the Air Quality Index (AQI), wind speed, Fire Weather Indices, and the availability of fire suppression resources. These factors are carefully assessed each morning before any burn approvals are issued.
The Air Quality Index measures particulate matter in the atmosphere. High particulate matter levels can negatively impact public health and are often influenced by thermal inversions, especially in areas like the Anchorage Bowl.
When wind speeds exceed or are predicted to exceed 10 mph, burning is generally prohibited. Local wind speed indicators are used to provide the most accurate assessment possible.
The Fire Weather Index (FWI) assesses the risk of fire ignition and spread by measuring the moisture content in various types of forest fuels and incorporating wind effects. This system provides a daily and seasonal overview of fire behaviour potential and is measured at weather stations located in high-risk fire zones. The FWI helps determine if today is a safe day for burning.
Available fire suppression resources are also crucial in determining burn approvals. While the local fire department (AFD) is the primary responder to fires, mutual aid agreements with organisations like the Division of Forestry (DOF) are vital for wildfire response.
The DOF provides critical support, including helicopters, air tankers, and engine crews, especially during peak fire season. Resource availability from the DOF, considering potential deployments to other areas, is a key factor in deciding if today is a burn day. “Is it a burn day today?” depends on whether these resources are readily available.
Factors like current fires burning in other parts of the state can impact resource availability and, consequently, burn approvals. Determining whether “is it a burn day today?” is a complex process involving multiple agencies and careful consideration of various risk factors.