Discussion
Which slope do isentropic surfaces have in mid-latitudes?
Answer: A
Potential temperature increases both upward and equatorward, so a surface of constant value must rise as one moves poleward. Typical slopes are of order one in a thousand, far gentler than the frontal surfaces embedded within them. Air flowing poleward along such a surface therefore ascends, which is the isentropic statement of warm advection producing ascent. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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