Jetstreams on significant weather charts

[EK380]

Hi,

Recently, we've been using significant weather charts for the ME and Asia, with some new symbols....

E.g. : there is a Jetstream at FL410, with a wind velocity of 170kts. Just below the FL410 notation, it says +110/-200.

What does this +100/-200 mean....?

Can anybody clarify ?


Thanks,

[Voidhawk]

It is: the spread vertically above/below the jet core (+/-) in hundreds of feet that the wind equals/exceeds 80kn.

(Found here)

[EK380]

Thanks for the info, Voidhawk.


Brgds