Imagine you live in a town in NorthCarolina sitting beneath the trough.
Reminder: Jet streams follow the contours of low and high pressure areas (troughs and ridges),
A.
warm and dry
B.
mild and rainy
C.
very cold and snowy
C. very cold and snowy
Since you live beneath the trough, the jet stream passing over your town would likely bring cold air and potential snowfall as it dips down into the region.