Weatherzone's 48-hour detailed forecast is pretty good and reliable IME.
For your location try:
http://www.weatherzone.com.au/nsw/hu...ailed-forecast
Another good one is the "cloud forecast" link on the Resources->Weather page here on IIS.
http://www.snow-forecast.com/maps/auscloud3days.shtml
I use BOM mostly for rain radar and synoptic charts.
These three sites combined have enough reliable info to fairly accurately forecast night sky conditions for up to 3 nights (2+1/2 days) in advance.
@glend There will always be tough to predict conditions every now and again, and like you say, you should look at satellite and other data to make your own assessment. The BOM does good work on a shoestring budget afaik. In fact they supply most other AUS weather sites with the data. But their forecast summary has to be given in a broadly accessible form (so it's understood by most people). So they just state the most likely scenario and do not state things like confidence intervals, or range of likely conditions with their respective probabilities. But you can figure those well enough if you consult more than the terse forecast summary and other sources. (Free BOM data for the public is very limited. They have to sell most of their data/analysis to keep afloat.)
@Exfso I'm sure what you describe could not happen these days. Meteorologists are well aware of the chaotic nature of the weather and how it can cause those sorts of freak events.