WATCHOUT NO.7
WIND CHANGE AT FIRE

INDICATOR EVENTS

OBSERVED EVENT	PRIORITY OF REACTION
Intense spotting on fire flank	?
Cloud in convection column collapses	?
Flank becomes headfire	Priority 1
Two convection columns converge	?
Convection column changes direction as it rises	?
Thunderstorm(s) approach fire	?

RESULTANT RED FLAG WARNINGS

RED FLAG WARNING	INDICATION LEVEL	SIGNIFICANCE
1) Plume-driven fire	Suggested	A
2) Conditions conducive to plume-driven fire	Suggested	C
3) Passage of dry slot over fire	Suggested	C
4) Thunderstorm	Suggested	B
5) Wind change	Mandatory	B
9) Unusual combustion	Suggested	C
10) Intense spotting	Suggested	B

DETAILED MATERIAL

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This material arises from work carried out by the HighFire Risk Project.

Material prepared by R. McRae September 2009.