“Pic of the Week”, January 13. 2017: A Frosty Morning in Calgary

08 frost

The Canadian prairies are rather dry, especially during the winter months.  There’s not much precipitation and humidity is often very low, cracking skin and boosting the sale of epidermal moisturizers.  It’s so dry that at times snow actually evaporates — not melts, evaporates.  There are rare occasions when it’s a little more humid and even rarer occasions when everything works together to give you the amazing spectacle of Hoar frost.

Hoar frost (aka hoarfrost or radiation frost) refers to white ice crystals, deposited on objects such as branches, leaves and wires. These crystals form by condensation of water vapor to ice on cold, clear nights.  Sometimes the hoar frost is so heavy it resembles snow, except that when you look at carefully, these …

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