McArthur Grassland Mark 5
The McArthur forest and grassland fire danger meters estimate fire behaviour
from measurements of wind speed, fuel moisture content and drought for
specific fuel types. They also combine the most important fire danger
variables to estimate rate of fire spread and flame height. They work
best during long, dry periods, when grasses are fully cured and when forest
fuels do not contain residual moisture from recent rain and the maximum
amount of fuel is available for combustion..
OF SPREAD, FLAME HEIGHTS AND BEHAVIOUR PREDICTIONS ARE ALL MINIMUM
AND SEVERE BEHAVIOUR WELL ABOVE THE METER'S PREDICTIONS MAY BE EXPECTED
AT FIRE DANGER RATINGS OF HIGH, VERY HIGH OR EXTREME.