That icy, wintry white covering tree branches around Calgary could be one of two weather wonders: rime ice or hoar frost. We asked a meteorologist at Environment and Climate Change Canada how to tell ...

Dear Science Mine: What is hoar frost, and how does it form? — Kris Douglass, Butte White frost or hoar frost is an amazing weather event that occurs in the cooler months of the year. Around Butte we ...

PORTLAND, Ore. (KOIN) — Unusual-shaped ice with an even more unique name has been spotted around Portland after sub-freezing mornings. Portland’s clear and chilly mornings are leaving behind some ...