[ncl-talk] Computing winds in an annulus

[Prashanth Bhalachandran]

Dear NCL’ers,
I have a question regarding the computation of winds in an annulus. 

That is, say I have a center lat and lon : cenlat, cenlon  
limit    = 2 ; In degrees 
  b1 = cenlat-limit
  b2 = cenlat+limit
  b3 = cenlon-limit
  b4 = cenlon+limit

This is what I use if want to average the winds in a box that is 2 degrees on either side of the center (4 degree x 4degree n total). 
uav = dim_avg_n(dim_avg_n(uu(tcount,:,{b1:b2},{b3:b4}),2),1)

However, what I am now interested in is averaging around an annulus (say between 4 degrees to 6 degrees from the center of the hurricane). What is the best way to do that? 

Thank you, 
Prashanth 

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