|A crisp frosty walk in Silton forest|
So, what is frost?
|Frost even brings out the patterns in a pile of leaves.|
Frost is renowned for being one of the most beautiful natural occurrences. The patterns it can make on leaves for example are beautiful. There are lots of different types of frost, which I have listed below with their definitions:
Advection Frost - is tiny ice spikes that are created when there is a very cold wind blowing over branches of trees, poles and other high up surfaces. Usually it forms against the direction of the wind. It can occur at any time, Day or Night.
|Frost up close - here its formed icy tubes|
Ground Frost - similar to an air frost but ice crystals form on the ground. Sometimes the ground can cool quicker than the air so you can get ground frosts without an air frost.
|Some crystals were amazingly long!|
There are also several different sub-types of Hoar Frost:
- Air Hoar is a deposit of Hoar Frost on objects ABOVE the ground, such as tree branches, plant stems, and wires.
- Surface Hoar is fern-like ice crystals directly deposited on snow, ice or already frozen surfaces, usually ON the ground.
|It made this plant look like a crystal chandelier|
- Crevasse Hoar consists of crystals that form in crevasses where water vapour can accumulate in calm weather conditions. This is IN the ground.
- Depth Hoar refers to cut crystals that have slowly grown bigger within caves UNDER banks of dry snow. Depth Hoar crystals keep growing, seemingly consuming neighbouring smaller crystals.
White Frost - Is a rare type of frost that forms when the humidity is over 90% and the temperature is below -8*C and it grows against wind direction.
|A bramble branch with new icy spikes!|
There are also phenomena called Glaze and Rime which are slightly different. They are formed when supercooled fog or drizzle come into contact with surfaces. Rime forms on vertical surfaces and glaze forms on the ground - sometimes known as Black Ice.
|The best I could do to capture the frosty sparkle|
I didn't know nearly as much as I did about frost as I do now! I didn't know there are types of frost that could grow in the day, or that there was even more than one type of frost.
Hope you enjoyed,