As a strong storm moved up the East Coast, the National Weather Service issued a number of blizzard warningpredict blizzard conditions and even warn that parts of New England could experience “Historical blizzard. ”
That leaves some wondering: What makes a storm a blizzard, anyway?
The storm is expected to dump up to 2 meters of snow over parts of the East Coast later this week. But the National Weather Service’s definition of a blizzard doesn’t require heavy snow — or, for that matter, any particular temperature.
It identifies a blizzard by three criteria: snow blowing or falling, winds of at least 35 mph, and visibility a quarter mile or less for at least three hours.
“Whether snow falls during a blizzard or not, hazardous conditions can occur,” a Weather Service Twitter account said. say on friday.
To shape, blizzards need cold air to form snow, and moisture to form clouds and precipitation. Moist air needs to rise above very cold air, forming clouds and snow.
Officials have also described this weekend’s storm as “nor’easter. That term typically describes a weather system in which winds off the East Coast collide with surface winds from the Northeast and Mid-Atlantic States between areas of low pressure.
https://www.nytimes.com/2022/01/28/nyregion/blizzard-conditions.html This is when a storm is considered a blizzard