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Wednesday, 10 October 2012 13:44

First frost ushers in winter

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mtn voicesIt’s Oct. 7 as I write this. The first hard frost hasn’t as yet arrived. But it won’t be long coming. By the time you read this it may well have occurred throughout Western North Carolina.

 

The first hard frost serves as a given year’s most distinctive dividing line. It’s dificult to pinpoint just when winter becomes spring, when spring become summer, or when summer becomes fall. But the winter season has been initiated when the first frost appears.

Like summer dew, frost appears on clear windless nights as the air cools and can’t hold as much moisture as it did during daylight hours. In summer and early fall, this excess moisture condenses on the surfaces of weeds, spider webs, metal tools, and other exposed objects. But when the temperature falls below 32-degrees the same vapor crystallizes, forming frost.

Through a process known as deposition. , the vapor does not turn first into water and then freeze. Instead, it changes directly from the gaseous state into a crystalline form. As more and more vapor freezes, delicate featherlike patterns of “window frost” (also called “fern frost”) are formed when a windowpane is exposed to very cold air on the outside and moderately moist air on the inside. The glass surface influences the shape of crystals, so imperfections, scratches, or dust can modify the way ice nucleates.

Looking like spun glass or cotton candy, “frost flowers” (also called “crystallofolia”) are very rare and very beautiful. They occur when there are freezing weather conditions when the ground is not already frozen. The water contained in a plant expands, creating cracks along the stem. Via capillary action, the water seeps out of the cracks and freezes on contact with the air, creating an ephemeral structure that closely resembles a flower. I have most often observed them exuded from the stems of common dittany (Cunila organides), a plant that’s common in the piedmont but uncommon in WNC.

Winter can be grim, of course, but it is in many regards the sweetest season of all. It’s the time when we see most clearly and feel most keenly. As Coleridge implies, it’s the season that’s ushered in via “the secret ministry of frost.”

 

“Therefore all seasons shall be sweet to thee,

Whether the season clothe the general earth

With greenness, or the redbird sit and sing

Betwixt the tufts of snow on the bare branch

Of mossy apple tree, while the nigh thatch

Smokes in the sun-thaw; whether the eave-drops fall

Heard only in the trances of the blast,

Or if the secret ministry of frost

Shall hang them up in silent icicles,

Quietly shining to the quiet moon.”

   — S.T. Coleridge, Frost at Midnight

 

George Ellison wrote the biographical introductions for the reissues of two Appalachian classics: Horace Kephart’s Our Southern Highlanders and James Mooney’s History, Myths, and Sacred Formulas of the Cherokees. In June 2005, a selection of his Back Then columns was published by The History Press in Charleston as Mountain Passages: Natural and Cultural History of Western North Carolina and the Great Smoky Mountains. Readers can contact him at P.O. Box 1262, Bryson City, N.C., 28713, or at This email address is being protected from spambots. You need JavaScript enabled to view it. .

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