What happens when aircraft operate in snowy conditions?

Before nearly every jet departure, there is a brief pause on the runway where the engines increase in power while the aircraft remains stationary. To an observer, it may look like a moment of ...

The deafening roar of jet engines revving at the start of the runway is not a sign of struggle, but a crucial safety procedure.

Snow is a common feature of many airports around the world, but when is too much snow a problem for aircraft engines?