"In this study, however, the goal is to forecast the potential for the development of snow squalls over land. One way to quantify the low level instability is to take the difference between the NGM layer 1 temperature (T1) on the NGM FOUS, and the temperature from model layer 5 (T5). The T1 temperature is the mean value taken from a layer which ranges from 1000 to 965 mb, while the T5 temperature is the mean value taken from a layer which ranges from 820 to 785 mb"--Page 2.

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