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wanzelbin

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Posts posted by wanzelbin

    Guidance on some basics

    in Spring Weather Discussion

    Posted

    I posted this on the Model Discussion thread a few days ago, but I didn't get a reply - guess I should have put it on here. 

    Hope someone might be able to straighten out some of my ideas below.

     

    Many thanks

     

    Ditto. -16 inside the Barracks corridor.Breath froze.

    When I mentioned in reply to SMs post that we could dream of a link between our Atlantic ridge and the Arctic high, I was thinking further down the line in output not the 06z

    gfsnh-0-288.png?6

    Hi

    I read lots of the posts on here, year after year, and regularly get caught up in the excitement, but despite having tried going through the nw guides (unfortunately a lot of broken links), wikipedia etc I still struggle to understand the detail of what's going on. 

    The terminology is tricky and mostly learnt (probably not correctly) from context - e.g. I think a "ridge" is a line of high pressure while a "trough" is an area of low pressure - but what would be really, really fantastic is if someone could use something like the chart above and explain why it would be so great for there to be a "link between our Atlantic ridge and the Arctic high" as winterof79 says above. Also, why is one called a "ridge", and one termed as a "high"? If these high pressure areas linked, this would increase the potential for cold in the UK? Is this something to do with "blocking"? This seems to be where a high pressure system holds up or directs the movement of a low pressure system, or vice-versa perhaps?

    As I understand it, a high pressure area will be pushing air down and out across the earth's surface - if this is in the polar regions, this is especially cold air, which is then sucked up by the moister slightly warmer and lower pressure area over the UK which might provide snow?

    Also, the colours on the chart - am I right in thinking this is something to do with DAM - the height above sea level at which pressure is 500 mb? If so, what does the purple spot over the Baltic Sea mean? On the colour chart this would be approx 510. Does that mean the pressure is 500 mb at 510 metres(?) with a surface level pressure of 1005 mb (judging by the numbers on the isobars)? So pressure is reducing quickly as you go up where there is a low DAM value? And that means what?

    I'm obviously building assumptions on assumptions, some of which are probably embarrassingly wrong. As I say, I've tried various resources to learn more, but it's very difficult without relevant examples. I hope this is considered acceptable for the modelling forum as it refers to current charts, but it would enormously help a very interested but struggling observer should anyone be able to provide a little insight.

    Many thanks

    • Popular Post
    • Popular Post

    Model Output Discussion - 05/01/2016 18z onwards

    in Forecast Model Discussion

    Posted

    29 minutes ago, winterof79 said:

    Ditto. -16 inside the Barracks corridor.Breath froze.

    When I mentioned in reply to SMs post that we could dream of a link between our Atlantic ridge and the Arctic high, I was thinking further down the line in output not the 06z

    gfsnh-0-288.png?6

    Hi

    I read lots of the posts on here, year after year, and regularly get caught up in the excitement, but despite having tried going through the nw guides (unfortunately a lot of broken links), wikipedia etc I still struggle to understand the detail of what's going on. 

    The terminology is tricky and mostly learnt (probably not correctly) from context - e.g. I think a "ridge" is a line of high pressure while a "trough" is an area of low pressure - but what would be really, really fantastic is if someone could use something like the chart above and explain why it would be so great for there to be a "link between our Atlantic ridge and the Arctic high" as winterof79 says above. Also, why is one called a "ridge", and one termed as a "high"? If these high pressure areas linked, this would increase the potential for cold in the UK? Is this something to do with "blocking"? This seems to be where a high pressure system holds up or directs the movement of a low pressure system, or vice-versa perhaps?

    As I understand it, a high pressure area will be pushing air down and out across the earth's surface - if this is in the polar regions, this is especially cold air, which is then sucked up by the moister slightly warmer and lower pressure area over the UK which might provide snow?

    Also, the colours on the chart - am I right in thinking this is something to do with DAM - the height above sea level at which pressure is 500 mb? If so, what does the purple spot over the Baltic Sea mean? On the colour chart this would be approx 510. Does that mean the pressure is 500 mb at 510 metres(?) with a surface level pressure of 1005 mb (judging by the numbers on the isobars)? So pressure is reducing quickly as you go up where there is a low DAM value? And that means what?

    I'm obviously building assumptions on assumptions, some of which are probably embarrassingly wrong. As I say, I've tried various resources to learn more, but it's very difficult without relevant examples. I hope this is considered acceptable for the modelling forum as it refers to current charts, but it would enormously help a very interested but struggling observer should anyone be able to provide a little insight.

    Many thanks

     

    • Like 10

    East Anglia & South East Cold Spell Discussion

    in Spring Weather Discussion

    Posted

    It's a real shame that temperatures in the UK are often just that fraction too high to make the most of marginal situations like this! Temperature in Tonbridge today has hovered around +0.5C (very slow thaw) and although the sun went down over an hour ago it's still +0.5C

    Down in the valley Tonbridge is often a little warmer than surrounding places, especially Sevenoaks to the north and Tun Wells to the south - they always get more snow than us!

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