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

Field Observer

The graph above shows a stylised DP depression event, and compares a typical diurnal trace that includes a sea breeze arrival with that of a typical event.
Detection of such events relies on access to AWS data or to data from hand-held instruments.

Situation Unit Officer

This graphic shows a “dry slot” or abrupt surface drying event moving inland ahead of a sea breeze front. The dry air shows up as a dark stripe on water vapour imagery such as this. Reference to AWS Data, visual imagery or infrared imagery would confirm the presence of a sea breeze.

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.