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The following is an excerpt from the above article.
“Officially, the National Weather Service defines a blizzard as a storm which:
- contains large amounts of snow OR blowing snow
- winds in excess of 35 mph
- visibilities of less than 1/4 mile for an extended period of time (at least 3 hours).
When these conditions are expected, the National Weather Service will issue a “Blizzard Warning”. When these conditions are not expected to occur simultaneously, but one or two of these conditions are expected, a “Winter Storm Warning” or “Heavy Snow Warning” may be issued.”