noun
unexpectedly strong snowstorm; sudden snowstorm
Refers to a sudden, intense snowfall that catches people off guard, often causing traffic disruptions. The term likens the unpredictable nature of such snowstorms to guerrilla warfare.
See also: ゲリラ
ゲリラ雪のため、高速道路が一時通行止めになった。
The expressway was temporarily closed due to a sudden snowstorm.
天気予報では晴れだったのに、午後からゲリラ雪が降り始めた。
The forecast said it would be sunny, but a sudden snowstorm started in the afternoon.