This one was a much bigger deal, a drive on a 2-2 count that soared over the Cardinals bullpen in right field and was estimated at 421 feet.
Carpenter entered the game 1 for 5 in the postseason, all five pinch-hit appearances. He had an RBI single in the wild-card playoff against Atlanta. He got 14 of his 46 RBIs in April as the primary sub at first base for injured Lance Berkman.
On Tuesday, Carpenter was among a group of seldom-used hitters trying to stay sharp by facing Jake Westbrook in a simulated game. The rest of the team had the day off.
Umpires called for the tarpaulin right after the Cardinals made it 3-1 on a run-scoring single by Shane Robinson and Cain was lifted.
It was the third game delayed by rain this postseason and a fourth, Game 4 of the Yankees-Tigers ALCS, was postponed later Wednesday night. Two games between the Yankees and Orioles in Baltimore began late because of inclement weather.
The rain intensified less than 10 minutes after the field was covered, chasing most fans who had remained in their seats up to that point. Spotters for the National Weather Service reported 60 mph winds in nearby St. Charles County.
A highlight of the delay was a Pac-Man style chase. Ushers pursued and finally apprehended a fan who jumped out of the stands to get a baseball near the warning track in left field, and then jutted in and out of aisles to elude several ushers who had been closing in.
The storm had been widely anticipated. Some forecasts called for a 70 percent chance of rain. Both managers fielded questions Tuesday and Wednesday about whether the probability of precipitation would affect their selection of the starting pitcher.
Both said they couldn't worry about the weather, and the starters combined for 208 pitches.