One thing I've noticed about Sanba is that, firstly, it developed very quickly, and secondly the pressure charts have been changing quite rapidly as well. When I checked the Taiwan CWB 7-day forecast chart yesterday, it had the (pre-Sanba) Sanba low converging with the low to the west of Sanba, and the whole massive bi-low just sitting there for the whole week. Now every model has Sanba moving NNW completely independent of the low to the west. This is a dramatic change in just the last 24 hours. Considering this record of fluctuating forecasts for Sanba, I'd say it's future track is far from certain.