In casey's fabulous answer here, he identifies several ways snow/ice can disrupt airport operations:
Continuous heavy snowfall can eventually close an airport if it becomes impossible to keep the runways clean, taxi routes become unusable due to drifting snow or snow transitions into sustained freezing rain (or runs out of de-ice fluid, yes IAH I'm looking at you). This is a transient problem and the closure would end as soon as conditions ease and the facilities can keep up with it.
Are there other ways that heavy snow (or ice) can disrupt airport operations? Could it perhaps interfere with lighting or navaids? Are there other airport functions that stop or slow in snow and ice?