Koppite
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Posts posted by Koppite
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Sunny but still very cold after a hard overnight frost.
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Its been bright and sunny today but rather cold, frost starting to form again.
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Great pics, thanks for sharing. :lol:
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Cloudy with showers which are sleety at times, still feeling cool in a brisk wind. :lol:
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Please Post Your Reports Here.
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Heavy rain and very windy at present, sleet for several hours earlier on.
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Great pics TD.
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Once again its a very cold frosty/icy start to the day.
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Great pics, some wonderful snowy scenes. Lets hope we have a lot more of this in the winter months to come. :lol: :lol:
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Great pics Ross, thanks for sharing.
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Very cold and frosty again this morning.
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Its been cold and foggy all day here.
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Great pics, thanks for sharing.
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Mostly cloudy today with the odd bright spell. Light winds and fairly mild.
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After a frosty start its been a dry and sunny day but still on the cool side.
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A below average 4.3c for me please. B)
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Mostly cloudy but dry, sunny spells at times. Feeling very cold in the wind.
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Great pics, thanks for sharing. Hope more of us get to see wintry scenes like that over the coming few months.
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Cold and clear, snow on the way maybe?
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Great pics, thanks for sharing.
Lets hope more of us get to see scenes like that over the coming days. -
Great pics Jurgen. B)
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Dull, cloudy an damp, not to cold and very little in the way of wind.
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Dry, sunny and mild with a light breeze.
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The polar vortex is a persistent large-scale anti clockwise cyclonic circulation pattern in the middle and upper troposphere and the stratosphere, centered generally in the polar regions of each hemisphere. In the Arctic, the vortex is asymmetric and typically features a trough (an elongated area of low pressure) over eastern North America and over NE Siberia. The polar vortex is not a surface pattern. It tends to be well expressed at upper levels of the atmosphere (that is, above about five kilometers). When the polar vortex is strong, deep purples can be seen on the 500hPa charts as shown below:
When these deep purples are situated over Greenland and Iceland then lower pressure dominates in the upper atmosphere which has a knock on effect to the lower levels. This tends to drive Atlantic based weather to these shores, giving us mild, wet weather. The stronger the polar vortex over the Arctic the Arctic Oscillation (known as the AO) will be more positive. When the AO is negative the polar vortex tends to be weaker and disrupted with areas of upper high pressure forming. These can 'block' the normal path of westerly surface low pressure systems and are known as blocking highs, and in the right position can lead to colder polar air heading southwards towards us.
Thanks very much for that Chionomaniac, what is the AO at the moment positive or negative? I presume the blocking high you mentioned is the elusive Greenland high that most people on here wish for.
Lets hope more of us get to see scenes like that over the coming days.
Todays Weather And General Chat
in Weather reports
Posted
Very cold and frosty again tonight, the frost never cleared in the shade all day. :lol: