Ball Movement

photo credit: tienvijftien   If you are on the green in the address position and your club has been grounded (resting on the putting surface), you can suffer a one stroke penalty if the wind moves your ball.  The key here is grounding your club. 

In windy conditions, the typical PGA Tour player will get into the address position without grounding their putter, if the ball moves, they will not be penalized.  Padraig Harrington found this out in the 2009 Masters when his ball was moved by the wind after his club was grounded.

Once you’ve grounded your club, even if you step away and the ball moves, it is still a penalty.  Another way to avert this problem is to remark your ball and start the sequence over.