Generally Speaking
Generally Speaking : (1) A fire or part of a fire which burns with the support of one or more factors of alignment will burn grass stems from the top down. Any grass stems not entirely consumed by fire may provide angle of char, cupping, degree of damage and/or protection indicators. (2) A backing fire which burns without the support of any factors of alignment will burn grass stems off at the base causing some to fall to the ground and into the area that has already been burned. Those grass stems remaining will generally point towards the direction that the fire came from. Grass stems may form a number of recognizable patterns within the area of origin and/or within a transition zone: (1) Circle pattern - when grass stems fall inwards in a circular pattern to point towards the point of ignition. This pattern occurs when a low intensity fire spreads relatively slowly away from the area of origin in all directions. (2) V or U pattern - when grass stems fall inward along a low intensity or transitional zone of a fire forming a V or U shape. This pattern occurs when a fire is influenced by wind or slope shortly after ignition. (3) Line pattern - when grass stems fall into the area of origin to form a line perpendicular to the direction of fire spread. This pattern occurs when a fire is almost immediately influenced by wind or slope, but it may be difficult to observe
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