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Auburn had 5 - 6 thunderclaps and one was quite reasonable. A strong thunderclap occurring around 9.30 am. At the time I had the radars up and noted the rainfall intensity was in the dark to light blue range. I though it was nimbo stratus cloud about 60 x 60 km in area but after that thunderclap, I realised it was a CB.
If you looked at the radars at this time there was a single storm cell moving very slowly off the coast. It was powering up just off Royal National Park, it was sliding NNW and weakening over Richmond then collapsing. The core was small but showing up as yellow and red but it never came ashore. I noted the core stayed offshore. That twister / water spout would have had to come from that cell and it was moving very very slowly Northwards.
Auburn had 41 mm. Seven Hills 29 mm, Sydney Airport 71 mm Cronulla 89 mm indicating where the core of that cell went. It was more coastal.
Harley
