Hi,

You can do it by NCL. Look at the following example for 20-100 days filter.

    ;--- 20-100 days bandpass ---
    ihp = 2
    sigma = 1.0
    nWgt = 201
    fca = 1./100.
    fcb = 1./20.
    wgt = filwgts_lanczos(nWgt, ihp, fca, fcb, sigma)
    x_day_filter= wgt_runave_Wrap(x_day, wgt, 0)

Regards,

--ufuk

On 10/23/13 7:57 AM, pyarimohan maharana wrote:

I currently have a daily model output for 20 years over Indian region, but I need to filter it to study different intraseasonal oscillation (10-20days, 40-60day etc) during the Indian summer monsoon period. Does anybody have a grads script for this or any help??

Thanks

Pyarimohan Maharana
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