Blizzards Can Occur Without Falling Snow, Experts Say

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A record-setting blizzard hit the Northeast on Monday, with several towns and cities measuring multiple feet of snow and wind gusts approaching hurricane force. However, some blizzards don't actually have any falling snow at all. The minimum threshold for blizzard conditions can be met with just blowing snow, as long as there are winds greater than 35 mph and visibility less than 1/4 mile for three or more consecutive hours.

Why it matters

This information is important for people to understand, as blizzard conditions can develop unexpectedly, even when there is no active snowfall. Knowing that blizzards can occur without new snow falling can help people in the Plains and Upper Midwest states better prepare for and respond to these dangerous weather events.

The details

The key factors for a blizzard are wind greater than 35 mph, visibility less than 1/4 mile, and falling and/or blowing snow for at least three consecutive hours. This means a storm could end, the sun could come out, and then blizzard conditions could still develop if the wind blows snow that fell previously and the wind and visibility criteria are met. The most likely parts of the country to experience blizzard conditions without falling snow are the Plains and Upper Midwest states.

• On Monday, a record-setting blizzard hit the Northeast.