Jet stream question

[Lancelot320]

Hi there !

I was quite sure that the minimum windspeed that qualifies as part of a jetstream is 60kt, but I just read some contradictory information on a weather chart, which says 80kt.
Which one's right ?
Thanks a lot guys

[zonnair]

60kts is what i recall too?

[Mansfield]

The American Meteorological Society states the following in their on-line glossary:

Currently, in the analysis of upper-level charts, a jet stream is indicated wherever it is reliably determined that the wind speed equals or exceeds 50 knots.

The upper and lower 80 knot isotach heights are typically shown on the upper-level chart below the jetstream core height.

[Lancelot320]

Oww, haven't been around for a while, thanks for your answers, guys :) here in Europe, seems like the 60kt answer prevails.
Regards