A blizzard is a severe snowstorm characterized by strong sustained winds of at least 56 km/h (35 mph) and lasting for a prolonged period of time—typically three hours or more. A ground blizzard is a weather condition where snow is not falling but loose snow on the ground is lifted and blown by strong winds. Blizzards can have an immense size and usually stretch to hundreds or thousands of kilometres.

Blizzard into Tochal Skiing resort, Tehran and involved skiers.

Area of occurrenceTemperate and polar regions, high mountains.
SeasonUsually winter.
EffectPower outages, dangerous travel conditions.