Discussion
Consider the following statements about thickness charts.
1. Low thickness indicates cold air.
2. The 540 decametre contour is a traditional snow guide.
3. Thickness gives the temperature at each individual level within the layer.
Which of the statements given above is or are correct?
Answer: B
Thickness is a mass-weighted mean, so it conceals the vertical distribution and cannot give level by level temperatures, which makes the third statement false. The first two are correct. This limitation is exactly why a shallow warm layer aloft can defeat the 540 decametre rule, and why forecasters examine the full sounding rather than relying on a single bulk quantity.
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