Assertion: snow storm | /r/HasProperty | three hours
Facets:
value: typically
type: DEGREE
Source sentences:
text: To be a blizzard, a snow storm must have sustained winds or frequent gusts that are greater than or equal to 56 km/h (35 mph) with blowing or drifting snow which reduces visibility to 400 m or 0.25 mi or less and must last for a prolonged period of time—typically three hours or more.