Event (26) Sudden non-diurnal fall in DP mid-afternoon.

Field Observer or Situation Unit Officer

The graph above shows a stylised DP depression event, and compares a typical diurnal trace with that of a typical event.

Data: BoM

The graph above shows a temperature, relative humidity and dew point time series for Moruya, 18th September – 21st September 2008. By reference to the event of the far right, note how the temperature rises, the dew point falls and the relative humidity falls in a synchronsied fashion.
Detection of such events relies on access to AWS data or to data from hand-held instruments.

Implications

Phenomenon	Urgency	Indicated Red Flag Warning
Abrupt Surface Drying	2	3) Passage of dry Slot over fire
Abrupt Surface Drying	2	7) Dew Point Depression Event

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

Material prepared by R. McRae September 2009.