[gradsusr] Finding zonal wind core value, and its position

[Muhammad Yunus Ahmad Mazuki]

Hello,

The picture attached is a slice of longitude 180E, from 40 S to 20S. As you
can see, the core that I wanted is at the 23S with wind speed of 18. I have
tried using maximum value function in grads, as well as maximum location,
but it would give me 39S corresponding to a core below 40S, which I do not
want. I would like to request suggestion on solving this problem. Changing
the latitude range to less than 40S however is not acceptable, as at
certain condition the core can be at 38 S.

Sincerely,
Muhammad Yunus
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