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post #36 of 40 (permalink) Old 6th January 2009
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On the weather forecast on BBC earlier, the forecaster said that the air temp (about eye level) was about 7degs warmer than ground (grass) level. I would say that tarmac would be warmer than grass/soil though

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post #37 of 40 (permalink) Old 6th January 2009
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The ground heats/cools the air, therefore the higher the thermometer, the greater the lag in it mirroring ground temp.

So, if you approach a cold night, the ground gets cold first, then cools the air. However, the next morning as temps increase, the ground warms first and then warms the air.

If memory serves - which it doesn't too often.
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post #38 of 40 (permalink) Old 6th January 2009
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Tuere you all explained by the man from the BBC

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post #39 of 40 (permalink) Old 7th January 2009
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my symbol doesnt flash, i think it gets smaller though , its small at the moment, but next time its warm(ish ill see if it goes the same size at the temp figure

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post #40 of 40 (permalink) Old 7th January 2009
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<So wind-chill factor will have no effect if the sensor gets wet then>
No I wasn't saying that Noel, if you evaporate something from a surface then the temperature of the surface will drop that is why I sweat (must turn the heating down).

I was talking about dry probes already at ambient temperature.

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