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The monsoon trough is not a simple east/west line - in fact on the surface, it is clearly to the north of Townsville, and has been since midnight - as you can see from the surface SE winds and lowest sfc pressures. The difference is aloft, the trough is tilted in the vertical, as it has to be to produce the kind of intense, prolonged rainfall about the Mackay area. A vertically tilted trough is the only way to get strong warm air advection in the low levels, which is where the persistent up-motion comes from. This is manifested in the wind profile - strongly backing from the surface through 700 hPa to 500 hPa at Mackay, but completely different at Townsville. Thanks to geosotrophic balance (or close to it) the backing profile always indicates warm advection in the Southern Hemisphere (except near the surface where friction complicates things). You will always see this wind profile with the high-end rain events. Of course, you also need the moisture and instability, but this is not usually a problem in N Qld in the wet season.