WATCHOUT NO.9
ABRUPT SURFACE DRYING

INDICATOR EVENTS

OBSERVED EVENT	PRIORITY OF REACTION
Sudden non-diurnal fall in DP mid-afternoon	Priority 2
Sudden non-diurnal fall in DP ahead of sea-breeze front	Priority 2

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	Mandatory	C
4) Thunderstorm	Suggested	B
5) Wind change	Suggested	C
6) Channelling event	Suggested	B
7) Dew point depression event	Mandatory	C
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.