Cookies On Netweather:
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.