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Weather colours

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  • 12-01-2016 8:30pm
    #1
    Roycropper63
    Registered Users Posts: 790 ✭✭✭


    Hi lads,

    Sorry for asking such a basic question, but the charts that are shown in the cold weather expected thread, how do we find out what the different colours mean?


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    #2
    Rebelbrowser
    Registered Users Posts: 3,133 ✭✭✭Rebelbrowser


    Roycropper63 wrote: »
    Hi lads,

    Sorry for asking such a basic question, but the charts that are shown in the cold weather expected thread, how do we find out what the different colours mean?

    Depends which charts Roy. Some of the charts are charts showing temps at 850hpa (equates to about 1500m altitude I think) or uppers as sometimes known. To get temp at ground level add roughly 9 or 10 degrees to these uppers. Very roughly you need uppets of ca. -8 for snow.

    Some of the charts are the atmospheric charts showing high and low pressure. The clours on those usually shows thickness of certain bands of atmospheric pressure (i think?). Out of my depth at this point to be honest..... I use 850hpa charts as I can follow them!


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    #3
    nilhg
    Registered Users Posts: 5,118 ✭✭✭nilhg


    Some good info to start with here:

    http://www.boards.ie/vbulletin/showthread.php?t=2056447334


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    #4
    MJohnston
    Registered Users Posts: 10,501 ✭✭✭✭MJohnston


    Curious about this too as regards to these kinds of charts:

    gfs-0-210.png?12

    I understand the isobars and units of pressure (at sea level from the translation), but I don't know what the colours represent, or what the unit of their scale is.


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    #5
    Iancar29
    Registered Users Posts: 5,068 ✭✭✭Iancar29


    MJohnston wrote: »
    Curious about this too as regards to these kinds of charts:


    I understand the isobars and units of pressure (at sea level from the translation), but I don't know what the colours represent, or what the unit of their scale is.

    Thats geopotential height, its the approx height of the pressure surface above mean sea level.


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    #6
    MJohnston
    Registered Users Posts: 10,501 ✭✭✭✭MJohnston


    Iancar29 wrote: »
    Thats geopotential height, its the approx height of the pressure surface above mean sea level.

    Thanks, "A Beginner's Guide To Reading Winter Charts" is good, but I wasn't sure what bits of it referred to on these kinds of charts :)


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    #7
    Roycropper63
    Registered Users Posts: 790 ✭✭✭Roycropper63


    Many thanks for the replies, will read that thread linked over the weekend,

    Roy


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