Jetstream on Charts MET
These diagrams, like others, can be misleading: look at the latitudes along the side rather than trying to decide for yourself what the latitude is.
The easiest one to identify is the Equatorial Easterly jetstream as this is the one that blows around the Equator "the wrong way" compared to the others.
Next furthest from the Equator is the subtropical at about 30 degrees N/S.
Next furthest from the Equator is the polar front at about 60 degrees N/S. There is the potential to confuse this with the arctic jetstream but this occurs only at the very highest latitudes and only at certain times of year.
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Refer to the image. Which jetstream is depicted by arrow A?