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Mxsmanic wrote in
: Chris W writes: My dad drives along the south side of OKC to work every day and his OAT in his car always goes a few degrees colder around the where the extended centerline for the runways would intersect the road. Then it goes right back up after he is through that area. He thinks this is because the airplanes are descending from very cold air and bringing down some of it with them. I would not have thought of that, but it's certainly plausible. Aircraft produce a massive downwash of air behind them that (at least in theory) drifts downward until it encounters the ground. In the case of aircraft very near the surface (as during landing and take-off), it's entirely possible that they might produce gentle downdrafts of colder air that reach the ground. I think it would take fairly constant traffic using the runway to make a clear difference, though. It's a bit like the constant wind that one often feels by the side of a highway or major city street, always in the direction of traffic. Moving vehicles do displace a lot of air. He has noted that this isn't always the case but it often is. You would think most of the traffic would be landing from the north since our winds are mostly from the south, but it seems like I see a lot of traffic coming in from the south, maybe because it is easier for the traffic from DFW to just come strait in. Things like noise abatement and other concerns might obligate the airport to work against the wind, at least if the wind speed is low enough (less than 10 knots or so). Anyway, any one here think it is really the case that the planes are causing the temperature to be lower on the approach end of the runway? I think it's plausible. You would, fjukktard. Bertie |
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It is farther away from the built-up areas of the town, so
it is cooler. Houses make heat and so do factories. | | Chris W writes: | | My dad drives along the south side of OKC to work every day and his | OAT in his car always goes a few degrees colder around the where the | extended centerline for the runways would intersect the road. Then | it goes right back up after he is through that area. He thinks this | is because the airplanes are descending from very cold air and | bringing down some of it with them. | | I would not have thought of that, but it's certainly plausible. | Aircraft produce a massive downwash of air behind them that (at least | in theory) drifts downward until it encounters the ground. In the | case of aircraft very near the surface (as during landing and | take-off), it's entirely possible that they might produce gentle | downdrafts of colder air that reach the ground. I think it would take | fairly constant traffic using the runway to make a clear difference, | though. | | It's a bit like the constant wind that one often feels by the side of | a highway or major city street, always in the direction of traffic. | Moving vehicles do displace a lot of air. | | He has noted that this isn't always the case | but it often is. You would think most of the traffic would be | landing from the north since our winds are mostly from the south, but | it seems like I see a lot of traffic coming in from the south, maybe | because it is easier for the traffic from DFW to just come strait in. | | Things like noise abatement and other concerns might obligate the | airport to work against the wind, at least if the wind speed is low | enough (less than 10 knots or so). | | Anyway, any one here think it is really the case that the planes are | causing the temperature to be lower on the approach end of the | runway? | | I think it's plausible. |
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