Understanding Blizzards

A blizzard forms when warm air rises over cold air, causing strong winds and precipitation. For a blizzard to occur, temperatures must be below freezing at ground level and in the clouds, with sufficient moisture for cloud and snow formation. The National Weather Service defines a blizzard as a severe snowstorm lasting at least 3 hours, with wind speeds of at least 35 mph and reduced visibility due to falling or blowing snow.

What is one of the initial conditions necessary for a blizzard to form?

• Warm air rising over cold air

• Warm air sinking under cold air

• Cold air rising over warm air

• Cold air sinking under warm air

For a blizzard to occur, what must the temperature be at ground level?

• Exactly freezing

• Below freezing

• Above freezing

• Irrelevant to blizzard formation

What is required in the air for clouds and snow to form during a blizzard?

• Strong sunlight

• Low humidity

• High pressure

• Sufficient moisture

According to the National Weather Service, how long must a snowstorm last to be classified as a blizzard?

• At least 1 hour

• At least 2 hours

• At least 3 hours

• At least 4 hours

What wind speed must be reached for a storm to be considered a blizzard?

• At least 25 mph

• At least 30 mph

• At least 35 mph

• At least 40 mph