The us military use to have 8 and 9 groups till 03. It is a useful tool to a forecaster but automated equipment can't encode it...so it went away for us.
As for extreme....about the only time we get see to extreme turb reports at zme is during thunderstorms. When the one genius tries to fly near\through\over a pretty thunderstorm. I always think what they expected when they decided to fly where they did...
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