Rain is looking less of a factor in the afternoon hours now. Wind will be a factor.
I'm not sure which team favors windy conditions. Normally I would say it hurts the team that likes to pass more (Purdue). But the Purdue defense has been SO suspect against the pass, that it could use all the help it can get from mother nature. 30 mph wind plus Spencer Petras, and Iowa might not attempt more than 10 passes all game long. This helps Purdue in their box stacking, zero man approach.
On the other side of the ball, I think the improved run game with Crazy Mock Legs allows Brohm to dial back from 50 passes per game to 20-30 and still be somewhat effective moving the ball. Aidan has the arm talent to drive the ball through the wind on short to medium routes to OPEN receivers. The tricky part will be him to not attempt fitting the ball into really TIGHT windows as he so loves to do. Some of those tight windows will necessitate throw aways with the windy conditions on Saturday and live another down, punt as required. If he manages the game well I think Purdue is in decent shape here.