You may not be familiar with a couple of the items within the snow forecast, the first one 850hpa temps is the temperature at approximately 1.5km above the ground. Generally this temperature needs to be at -5°c or below for snow to be likely. The other term is 500-1000hpa, this is a measure of the height or 'thickness' between these two points in the atmosphere (HPA is a measure of air pressure, so these points move up and down dependant on conditions). In general for snow to be likely, this value needs to be showing 528dam or less.
Want more detail and longer range forecasts?
For an even higher detailed snow forecast out to 16 days, plus a huge variety of other forecasts and features (including the weather type radar which shows whether rain, sleet or snow is falling and is updated every 5 minutes), take a look at Netweather Extra.