Wednesday, January 6, 2010

a very cold snap

we find ourselves back in dublin and in the midst of a 'very cold snap'....

So you can appreciate your summer even more, here is our own very different weather forecast for today: (just to compare, you know, for fun)

Today
Hail and snow showers in the east and southeast - some heavy, and giving further falls of snow in places there. Scattered wintry showers near the northwest and west coasts, with the risk of localised snowfall there also. Dry otherwise, with widespread sunshine, but with frost lingering in places. Highest temperatures between 0 and + 5 C.

Tonight
Widespread severe frost this evening and tonight, icy conditions in many areas. A few freezing fog patches also. Snow showers in the east and southeast dying out this evening and early tonight. Scattered wintry showers continuing near the northwest and west coasts, and extending to the southwest coast overnight also - even where these are of rain or sleet, they could increase the risk of ice. Temperatures below 0 C virtually everywhere, and reaching - 6 to - 8 C in places.

It is freezing indeed, we have had downfalls of light snow, hail, sleet, rain all just this morning... plus this 'freezing fog'..
Yes... 'freezing fog'... What the hell is it anyway?
My guess is as good as yours and yet, we have apparantly experienced it first hand...


So... as i find myself somewhat trapped inside the house, protecting myself from the elements, yet avoiding neccessary study.... with a curiosity for freezing fog and what it all means.... i decided to hit wikipedia and find out...
and... among all the other types of fog i hadn't heard of before, i found the one most relevant to us:


Freezing Fog:
Freezing fog occurs when liquid fog droplets freeze to surfaces, forming white soft or hard rime. This is very common on mountain tops which are exposed to low clouds. It is equivalent to freezing rain, and essentially the same as the ice that forms inside a freezer which is not of the "frostless" or "frost-free" type. The term "freezing fog" may also refer to fog where water vapor is super-cooled filling the air with small ice crystals similar to very light snow. It seems to make the fog "tangible", as if one could "grab a handful".

I shall resist the temptation to 'grab a handful'


and, for those who would like to know more,


Fog is a cloud that is in contact with the ground. A cloud may be considered partly fog; for example, the part of a cloud that is suspended in the air above the ground is not considered fog, whereas the part of the cloud that comes in contact with higher ground is considered fog.

so, there you go... i didn't know that either! cute!

1 comment:

Rachel said...

I remember the aftermath of frozen fog on a Cambridge day - we had a big snow dump overnight and the next day was beautifully clear - and all the trees were covered in ice! glistening in the sunl - wonderland! - spent the whole day outside.