snow is basically a lot of air. In a normal situation 1 mm of water produces 1 cm of snow. So there is a lot of air in a snowflake.
The density of snow is all depending on what they call the snow-water content. Heavy snow has a high water content and light snow has a low water content.
A normal storm produces snow that has a water content between 7 and 11 %. In other words: 89 tot 93% is air. Light snow has a water content less than 7% and heavy snow more than 11%. To put this all in perspective: man made/artificial snow has a water content around 24-28 percent.
What does this mean? For 1 cm of man made snow you need 2.4 to 2.8 mm of water. For cold smoke you need less than 0.7 mm of water. There have been storms that produced incredibly light snow with a water content near 3%, which means that 0.4 mm water produces 1 cm of snow. Or better said 1 mm of water produces 2.5 cm of snow with 96% air in it.
For cold smoke you need very cold air. This cold air could be transported towards the Alps with a northern or eastern upper air flow, but can also be available in the Alps. Especially the inner alpine areas do have a fairly dry and cold climate during high winter. Cold air sinks into these valleys and since this air is heavy and the angle of the sun is pretty low in high winter this cold air layer might be present until spring kicks in.
Scenario 1: northern or eastern upper air flow
Cold air moves in and the last cm's of a snow storm will be of lighter snow. We see this mostly on the Northern side, but sometimes also in the Piemonte when cold air kicks in the Po valley and pushes clouds towards the western and southern Piemonte.
That having said: on the southern side of the Alps chances for blower pow are bigger in the Piemonte than in the Dolomites since the Dolomites mostly have a warmer southwestern airflow that brings snow.
Scenario 2: a mild enough but not to mild storm moves in which ensures very cold snow lower on the mountain.
Something to be aware of in all scenario's: wind!