2023-9-71 Rime on the crabapple tree - or is it hoar frost?
A news source said: "Rime frost occurs on foggy nights when moisture deposits create spiky formations on cool surfaces, whereas hoarfrost forms on cool, clear nights rising from moisture near the ground and has a fluffier incarnation." Given we had fog, and at -18°C overnight, there was little chance of moisture rising from the ground, I'd say... There was lots of frost on the treetops and much less on the lower branches...
PS - For those not familiar with the concept anymore, behind the branches is a clear, blue sky... 😄
2023-9-71 Rime on the crabapple tree - or is it hoar frost?
A news source said: "Rime frost occurs on foggy nights when moisture deposits create spiky formations on cool surfaces, whereas hoarfrost forms on cool, clear nights rising from moisture near the ground and has a fluffier incarnation." Given we had fog, and at -18°C overnight, there was little chance of moisture rising from the ground, I'd say... There was lots of frost on the treetops and much less on the lower branches...
PS - For those not familiar with the concept anymore, behind the branches is a clear, blue sky... 😄