Starfighter
Cricket Web: All-Time Legend
Slow moving troughs are well, slow, and interact with the coast in annoying ways. Plenty of little showers east of the main band too. These systems have a habit of sticking around as they are westward moving embedded in the larger-scale general eastwards progression.Was more that the big belt of rain should be gone by that point.
Problem is you need at least another two hours to clear things up, and any further interruptions will only hurt.
Also, you're forgetting it's Sydney. The ground staff will hang around doing three-fifths of stuff all for forty minutes after the rain stops, and the minimalist covering means the runups will be plenty wet.