The Blizzard Brought Donuts!

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Snow Roller
NOAA

Imagine walking out on a cold winter morning and finding the landscape covered with icy snowballs, donuts and jelly rolls.

That’s what happened after the late January blizzard. From Illinois to Pennsylvania, people discovered a playground of snow rollers, rare snow formations normally only found at the South Pole!

Have a donut, complements of the latest blizzard! SOURCE: NOAA

The blizzard brought record-breaking cold – temperatures not seen in a generation. With it, it brought the recipe for snow donuts:

1.     Powder snow – Cold air holds very little moisture, so any snow that falls feels as dry and light as frozen talcum powder. It is normally found in Antarctic or high in the Rocky Mountains. Midwestern and Eastern states, used to heavier, wetter snows, prone to turn to slush and ice, found themselves covered with delicate powder snow.

Snow rollers – just add powder snow and high winds. SOURCE: NOAA photo by Jolene Albert

2.    Wind packed crusts – Normally, the top layer of snow forms a crust from melting slightly, then refreezing to an icy layer. During the late January blizzard, however, temperatures were too cold to allow any melting. Instead, the high winds packed the powdery snow denser and denser until it formed a thin, light crust.

3.    High, rolling winds – As the high winds continued, they caught occasional broken edges of the snow crust. Swooping under, they lifted the layer. It began to roll. Soon it formed a donut or, if large enough, a jellyroll. If the winds continued to roll it, it would pack into a snowball, or a densely layered log.

High winds catch the frozen crusts of snow and roll them like snowballs. SOURCE: NOAA

Although the late January blizzard was technically not a “Polar Vortex” storm, it brought rare snow formations normally only seen in Antarctica. What’s next this winter? Penguins?

~ By  Evelyn Browing Garriss and James J. Garriss

About This Blog

Evelyn Browning Garriss doesn't just blog about the weather forecast; she provides insight on WHY extreme weather is happening--and a heads up on weather to watch out for. A historical climatologist, Evelyn blogs about weather history, interesting facts about the weather, and upcoming climate events that affect your life--from farming to your grocery bill. Every week, we look forward to another great weather column from Evelyn. We encourage our weather watchers to post their comments and questions--and tell us what they think!

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