How to cauclate windspeed amd direction from era interm?
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The mean wind speed (10si) is not equal to the speed of the mean wind components.
The mean wind speed for the month is produced by calculating the wind speed at each individual time within the month and then averaging over the month.
Example
Consider a wind of 10ms-1 that is westward for half of the month and eastward for the other half. The mean wind speed is 10ms-1, but the mean of the U wind (and V wind) component is zero. The speed of the mean components is also zero.
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