Dotted around the pistes are the signs "Warning, slushy snow". Warning? Surely it should say "Woop, slushy snow" or even "Get over here! Slushy snow". Powder's great and all, but being honest, it's generally pretty cold. And it does get into every gap of your clothing if you fall. Slush on the other hand only comes out when the temperatures are balmy, the sun is in the sky, and there's no wind.
OK, so there's an exception to that rule which is when the foehn wind blows. A meteorological phenomena which in the Chamonix area generally means heavy precipitation on the Italian side of the massif and a warm dry wind, often disruptively strong, on the French side. And that's what we've had several days this week.