Keetch-Byram Drought Index (KBDI) Map

Observations on Tuesday May 21, 2013 at 1300

KBDI is a soil/duff drought index that ranges from 0 (no drought) to 800 (extreme drought) and is based on soil capacity of 8 inches of water. Factors in the index are maximum daily temperature, daily precipitation, antecedent precipitation, and annual precipitation.

Between 0 and 200, soil moisture and large class fuel moistures are high and do not contribute significantly to fire intensity.

Readings of 201-400 are typical of late spring, early growing season. Lower litter and duff layers are drying and beginning to contribute to fire intensity.

Readings of 401-600 are typical of late summer, early fall. Lower litter and duff layers burn intensely.

Readings of 601-800 are associated with severe drought and increased wildfire occurrence. Intense, deep burning fires with significant downwind spotting. Extensive mop-up required. Live fuels burn actively.