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Thickness - 1000-500 mb -72 hr

Thickness - 1000-500 mb -72 hr
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This is contour plot of thickness in meters with an interval of 60 meters. Thickness is a measure of mean temperature in a layer of the atmosphere and ranges from 4900m in cold wintertime atmospheres to 5900m in warm summertime atmospheres. The 5400 meter line is often used as an indicator of the rain-snow line.