Came across this nice forecast page at Weatherzone.com.au that gives rain percentage chances and estimated amounts on top of BOM models:

http://m.weatherzone.com.au/tas/lower-derwent/hobart

it also gives 3 hourly forecasts which add a bit of detail to work out whether it will rain in the morning or arvo:

http://m.weatherzone.com.au/tas/lower-derwent/hobart/next48hours

It also gives a 7 day forecast & 3 hour forecasts (click on "Next 48 Hours" for 3 hour forecasts) for other locations, which you don't get on the BOM:

http://m.weatherzone.com.au/tas/central-north/launceston http://m.weatherzone.com.au/tas/east-coast/swansea http://m.weatherzone.com.au/tas/east-coast/fingal http://m.weatherzone.com.au/tas/northeast/st-helens http://m.weatherzone.com.au/tas/west-and-sth-coast/strathgordon http://m.weatherzone.com.au/tas/west-and-sth-coast/strahan http://m.weatherzone.com.au/tas/lower-derwent/tunnack http://m.weatherzone.com.au/tas/lower-derwent/melton-mowbray http://m.weatherzone.com.au/tas/central/bushy-park http://m.weatherzone.com.au/tas/central/lake-st-clair http://m.weatherzone.com.au/tas/central/maydena http://m.weatherzone.com.au/tas/northwest-coast/burnie http://m.weatherzone.com.au/tas/northwest-coast/sheffield http://m.weatherzone.com.au/tas/northwest-coast/smithton http://m.weatherzone.com.au/tas/northwest-coast/marrawah