Rime ice on tree
“Snowy” tree on a snow ‑free day.

My friend Pamela sent me this pic­ture of a tree in her yard. That morn­ing, low clouds cov­ered their area, but no snow­fall occurred. You can imag­ine her sur­prise and delight when she looked out and saw this beau­ti­ful “snow cov­ered” tree when there was no snow! It remind­ed her of the Christ­mas trees with flock­ing on them.

Turns out there is some­thing called Rime ice, which coats trees with ice droplets from fog, often on a moun­tain ridge. A friend in Col­orado told me about this phe­nom­e­non when I showed him this pic­ture of Pame­la’s tree.

Rime ice occurs with fog, cold tem­per­a­tures and high alti­tude. Hard rime is a white ice with a “comb like” appear­ance, and soft rime has a more feath­ery appear­ance. Mete­o­rol­o­gists have a num­ber of fine dis­tinc­tions beyond these — most­ly relat­ed to how the ice forms and under what conditions.

For the rest of us, here’s to sim­ply enjoy­ing the beau­ty of a snowy tree in the midst of a snow-free land­scape on a win­ter day.

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