Click for home pageEvent (12) Low-level clouds & smoke moving much faster than indicated by surface wind speed

Air Observer

Photo: Lannon Harley, 148.91° -35.32° looking SSE. 09:27 AEDST 18th January 2003.
This photo shows the effect of a low-level jet on a smoke plume. Note the extreme stretching, by the wind gradient, of the plume top on the left.

Situation Unit Officer

Data supplied by BoM.
The graph above shows a wind profile during a low-level jet event. Note the maximum wind speed at 1500m.

Implications

Phenomenon Urgency Indicated Red Flag Warning
Low Level Jet 3 2) Conditions Conducive to Plume-Driven Fire

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This material arises from work carried out by the HighFire Risk Project.
Material prepared by R. McRae September 2009.