“March is often a big month for snowstorms,” Schumacher said. “Instead of getting snow we would normally expect we got this unprecedented, way-off-the-scale warmth.” (https://www.theguardian.com/us-news/2026/apr/01/snowmelt-ame...)

Beside that, the measurements are of how much moisture is left to melt off:

It’s not just the amount of snow left on mountaintops that’s concerning experts, but the amount of moisture still frozen within them. “Snow water equivalent” (SWE), a measurement of what could melt off to supply natural and manmade systems, is exceptionally low.