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! Calculation 500hPa zonal circulation the index U50IN, take the points U average 500hPa circulation indices V50IN, take the points average | V |! 500hPa westerly circulation index UV5IN (U/(U-average = U50IN)- | V |/(| V | average) = V50IN)! U-average = 11.59 V-average = 4.75 the average is, according to T213 model 000 2002.08.01- 2007.03.27 calculated range: 25N- 45N 90E- 120E ! II is a zonal grid points, JJ is by the number of grid points