Abstract
Summary The moisture content of fully cured grass fuel predicted by the original slide rule version of the McArthur Mark V Grassland Fire Danger Meter may differ by up to 3% in oven dry weight from that predicted for equivalent weather conditions by a commonly used equation derived from the meter. The difference between predicted values from the original meter and the equation is greatest at lower air temperatures (≤ 20°C) and when relative humidity is ≥ 40%. This discrepancy is unlikely to result in substantial differences in calculated fire danger indices, but could affect the results of studies attempting to correlate observed fuel moisture contents with predictions from either the original meter or the equation.
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