links to external sites below
These are GFS (Global Forecast System) ensembles which are models from different weather prediction systems produced at the same time. This graph is for La Tania & updated every 6 hours.
Bottom lines are precipitation and top lines are temperature forecast. Red is a 30 year average. Blue is the control line. Grey is a consolidation. When the lines are all close together the forecast should be more accurate - for snow look for peaks downwards heading below zero from the top lines and peaks upwards from the bottom lines, showing the forecasted amount of snow.
Click here for the full size image
The Full Weather Page with further explanation and more links is here