Thanks for your post. Good thing to compare forecasts with actual snowfall. When you do so, keep two things in mind.
1. 6 day forecasts are never very accurate on micro scale. 6 day forecasts will give you an idea what might happen on macro and sometimes meso scale. Forecasters do work with what they call the forecast funnel. For the long term (5 days and further) they will express their thought on a macro level (in this case the Alps and sometimes on a more specific level: northern Alps, southern Alps, western Alps), for the mid term (2 tot 5 days) they will express their thoughts on a regional scale or even bigger (in this case northern Alps, southern Alps, western Alps, but also Lombardia, Vorarlberg, southern Piemonte etc..). For the short term 0-48 hours they will get more specific on a micro scale.
So if you want to compare actual vs forecasted snowfall on a micro scale you should use the 24 hours forecast maps and compare them with weather stations (and webcams) in the neighborhood. For example these:
And these webcams: http://wepowder.com/nl/webcam/1452341914
2. Actual fallen snow and accumulated snow are never the samen. Snow settlers over time and the amount fallen is always more than the amount measured since it settles. Read also: http://wepowder.com/en/forum/topic/233471
The actual forecast is based on a storm that is expected to move in on friday-saturday. This storm is accompanied by very cold temperatures and the warm Mediterranean will boost the snowfall. But since we are 36-48 hours away from the moment the storm moves in and the fact that this storm is not directed by a strong and dominant jetstream the exact storm track is still uncertain. So if you want to compare forecast and actual snowfall on a micro scale please use the 24hour or the 48hour maps.
Does this help?