Freezing fog covers southeast Nebraska in rime: What is it and how does it form?
LINCOLN, Neb. (KLKN) – Freezing fog overtook most of southeast Nebraska early Tuesday morning resulting in a unique weather phenomenon called rime. It coated all elevated surfaces bright white and made objects look extremely sharp. But what is it and how does it form?
Rime is a combination of ice crystals that form as a result of supercooled water droplets (water that exists below 32 F) freezing onto objects that are below 32 F. The object and air must be below freezing for rime to form and this is the case with freezing fog. Water droplets in the air instantly freeze upon contact with an object and turn into ice without changing phases.
You might have also heard of hoar frost which looks similar to rime. This is a different type of weather phenomenon that forms on clear and cold nights without the presence of fog. Water vapor changes from a gas to ice, creating the frost on surfaces. This is different from rime since rime requires supercooled freezing fog and doesn’t require a phase change.
Below are a bunch of photos we received of rime coating different surfaces across southeast Nebraska. Feel free to send us photos by going to the submit news tab on the top right of our website.
Meteorologist Brittany Foster