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Predicting Weather Using A Barometer


RhysGM

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Hello, I've just bought a new watch which shows me what the current barometric pressure is. I believe I have callobrated it correctly to my location. Now I have been searching on the internet to find some kind of chart which tells me how to interpret the changes in pressure.

What I know so far is if it's rising this indicates improving weather and falling indicates detoriating weather.

Does anyone have a link to a website which shows something in a litte more detail. ie I would like to have a one pager I can print off. Which shows;

If it is the summer and pressure is between x and y and rising then weather is abc

If it is the winter and pressure is between y and z and falling then weather is def

Something with all the combinations. Can this be done, would it be specific to location and altitude. I'm near gatwick at about 60 meters. Does my barometer need to be calloborated to sea level?

Thank you.

Rhys.

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Posted
  • Location: Edinburgh
  • Location: Edinburgh
    Does my barometer need to be calloborated to sea level?

    Thank you.

    Rhys.

    Its standard I believe that all pressure readings are given to sea level so I believe it will need to be set to sea level.

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    Posted
  • Location: Purley, Surrey - 246 Ft ASL
  • Weather Preferences: January 1987 / July 2006
  • Location: Purley, Surrey - 246 Ft ASL

    Problem with a barometer on a watch is that the pressure will alter as you yourself change altitude, i.e. if you walked up a hill etc. This will thus make it difficult to get a feel for how much the pressure has actually changed.

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    Problem with a barometer on a watch is that the pressure will alter as you yourself change altitude, i.e. if you walked up a hill etc. This will thus make it difficult to get a feel for how much the pressure has actually changed.

    I work in an office on the 2nd floor so most of the day I will remain at the same altitude so the pressure should remain consistant.

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  • Location: Edinburgh
  • Location: Edinburgh
    I work in an office on the 2nd floor so most of the day I will remain at the same altitude so the pressure should remain consistant.

    The thing is it isn't depandant just on altitude but both altitude and tempreture. So one day it could make a diffrence the next it might not. The best thing is to have it set at sea level to avoid any errors its more accurate.

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    The thing is it isn't depandant just on altitude but both altitude and tempreture. So one day it could make a diffrence the next it might not. The best thing is to have it set at sea level to avoid any errors its more accurate.

    In either case do you know of some kind of lookup table or chart I could use. As at the moment they're just numbers with no meaning. I've tried searching on google but I must not be using the right search terms as I'm not getting anything useful.

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  • Location: East Renfrewshire 180m asl
  • Location: East Renfrewshire 180m asl
    In either case do you know of some kind of lookup table or chart I could use. As at the moment they're just numbers with no meaning. I've tried searching on google but I must not be using the right search terms as I'm not getting anything useful.

    You can get sun with low pressure and rain with high pressure so it is pretty difficult to forecast with any accuracy using only a Barometer.

    The only real way to forecast is to use the pressure trends, but you know them already. But to add some numbers to them, if the pressure falls and gets below 980mb then it will most likely be windy and rainy. If it is as high as 1020mb and above then it is more likely to be dry and calm.

    Everything also depends on cloud amounts and temperature, the atmosphere is pretty difficult to understand so unfortunatley it isn't as easy as reading it off a watch, there are to many variables :)

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    You can get sun with low pressure and rain with high pressure so it is pretty difficult to forecast with any accuracy using only a Barometer.

    The only real way to forecast is to use the pressure trends, but you know them already. But to add some numbers to them, if the pressure falls and gets below 980mb then it will most likely be windy and rainy. If it is as high as 1020mb and above then it is more likely to be dry and calm.

    Everything also depends on cloud amounts and temperature, the atmosphere is pretty difficult to understand so unfortunatley it isn't as easy as reading it off a watch, there are to many variables :)

    I've just ordered this book so hopefully it will give me a good idea at what I need to do.

    http://www.amazon.co.uk/Philips-Guide-Weat...p/dp/0540090263

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    Posted
  • Location: City of Gales, New Zealand, 150m ASL
  • Location: City of Gales, New Zealand, 150m ASL
    If it is the summer and pressure is between x and y and rising then weather is abc

    If it is the winter and pressure is between y and z and falling then weather is def

    You can get low cloud and drizzle with air pressure of 1030hPa, so it's quite hard to do this.

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