The Oklahoma Cold Front of November 10, 1995
Answer to Question 8
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Question 8. What happens to the Norman sounding between 6:00 p.m. on November 10, and 6:00 a.m. on November 11?

Answer. Between 6 p.m. on Nov. 10 and 6 a.m. on Nov. 11, the Norman temperature profile cooled to the point where the whole vertical profile was below freezing at 6 a.m. If the Norman sounding indicated moisture, the sounding would be a snow sounding. Because cold fronts slope towards cold air (as seen here), the depth of the cold air increases as the front moves past a given point. Thus, in our sounding, we can see that as the front moved south past Norman, the depth of the cold air (seen through north winds and colder temperatures) increased from 850 mb to 600 mb overnight.

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