Snowstorm blizzard

An intense snowstorm, known as a blizzard, is an extreme weather phenomenon with strong winds and reduced visibility.

About this subject

Blizzards are severe snowstorms characterized by sustained winds or frequent gusts above 56 km/h (35 mph) that lift loose snow, reducing visibility to less than 400 meters for at least three consecutive hours. These storms occur mainly in high-latitude regions such as the northern United States, Canada, Russia, and northern Europe. In tropical countries like Brazil, blizzards are nonexistent, though cold waves can cause similar phenomena in the southern highlands, including snowfall, but without the hallmark winds of a blizzard.

The formation mechanism involves the collision of polar cold air masses with warmer, moist air, creating instability and heavy snowfall. The combination with strong winds results in a whiteout, where the horizon disappears, disorienting people and vehicles. Historic blizzards, such as the Great Blizzard of 1888 in the US, caused thousands of deaths and billions in economic damage. Safety measures include avoiding travel, stocking supplies, and staying warm.

Although the term is often used loosely for any heavy snowstorm, the technical definition requires specific wind and visibility criteria. Storms that do not meet these thresholds are called snowstorms or common snowfalls. Interestingly, the word "blizzard" has uncertain origins, possibly from German "blitz" (lightning) or Old English "blíþe" (violent).

Frequently Asked Questions

What is the difference between a common snowstorm and a blizzard?

A blizzard requires sustained winds above 56 km/h and visibility less than 400 meters for at least three hours, while a common snowstorm may have less wind or shorter duration.

Where do blizzards occur most frequently?

They occur mainly in cold continental climates, such as the US Great Plains, Canadian prairies, Siberia, and northern Europe.

How to prepare for a blizzard?

Stock up on food, water, and medicine; avoid going outside; ensure heaters work; and have an emergency kit with flashlights and blankets.