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300 hPa streamlines + windspeed (Winter jetstream)
|Jetstream (= windspeed > 60 kt (31 m/s)).
During Winter, jetstream tends to be lower in atmosphere, so 300 hPa height is useful.
A little explanation where to find these zones:
Jet streaks pull in air upstream (to their west) in what is called the entrance region and throw it out downstream (to their east) in what is called exit region. They are further subdivided in a left or right zone as shown on the picture.
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