deuces

Here is a case play that is close to the question you asked ump1. 

“5.1.1 SITUATION A: With runners on first and third base and no outs, R1 and R2 proceed with a double steal, B3 hits a high pop fly over foul territory and the wind starts to carry the ball into fair territory. The umpire-in-chief prematurely calls foul ball as F2 makes the attempt to catch the ball. He drops the ball in fair territory. RULING: The fact that the ball touches the ground has made the ball dead and the umpire sends R1 and R2 back to their respective bases.”

Bottom line if the umpire calls it foul it is always foul unless the ball is caught in the air.