FAB Winds app for iPhone and iPad

Calculates a vector wind velocity and wind direction based on pilot entered AGL altitude winds. It calculates high wind and low wind results based on an actuation altitude (i.e. parachute deploys).

The app will autofill any blank/missed wind data based on:
If there are no known winds below blank altitude, it will extrapolate data based on 0 winds at 5000 feet below the surface. If there are known winds below and above the missing value, it will interpolate the direction and strength as an even distribution between the closest two known data points.
If there are no known winds above the missing altitude, it uses last known winds below.

Usually FAB Winds iOS app used & searched for