I USED AN iPHONE XR TO PHOTOGRAPH FREEZING FOG – TU GRANGEGORMAN CAMPUS
I could not believe how cold it was.
Met Eireann issued a nationwide yellow warning as “freezing fog” was set to cover parts of Ireland on Sunday and Monday.
Freezing fog forms in the same way as normal fog when the land cools overnight under clear skies. If there are clear skies, the heat radiates back into space leading to cooling at the earth’s surface. This results in a reduction of the air’s ability to hold moisture which allows water vapour to condense into tiny water droplets eventually leading to the formation of fog.
When fog forms in temperatures that are below freezing, the tiny water droplets in the air remain as liquid. They become supercooled water droplets remaining liquid even though they are below freezing temperature.
This occurs because liquid needs a surface to freeze upon. When droplets from freezing fog freeze onto surfaces, a white deposit of feathery ice crystals is formed. This is referred to as rime; rime is a characteristic of freezing fog and is often seen on vertical surfaces exposed to the wind.