McArthur Forest 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.