Has anyone ever heard of a haar?
It's a freezing fog that comes in from the sea like a white wall. and blanks out everything making it next to impossible to see. The temperature drops dramatically, I'm sure I've experienced it in both Cornwall and Jersey. In the latter case the buzzing of model aircraft from a nearby airfield suddenly stopped. Looking seawards the white wall rolling towards me was scary. I was rapidly unable to see a thing. Not the safest of situations on a cliff path. Luckily I bumped into a local resident who led me to the safety of the car park. Apparently its common on the east coast of Scotland. I've never experienced it in Ireland.