At the start of the rain delay during the Astros and Cubs game at Wrigley Field, fans are advised to take cover in the concourse due to a tornado warning being issued by the National Weather Service for downtown Chicago. The game resumes in 2 hours, 45 minutes, but approximately an hour later more thunder and lightning and another 39-minute stoppage cause the contest to be called in the bottom of the eighth, with Houston credited with a 2-0 rain-shortened victory.

On August 4, 2008 — At the start of the rain delay during the Astros and Cubs game at Wrigley Field, fans are advised to take cover in the concourse due to a tornado warning being issued by the National Weather Service for downtown Chicago. The game resumes in 2 hours, 45 minutes, but approximately an hour later more thunder and lightning and another 39-minute stoppage cause the contest to be called in the bottom of the eighth, with Houston credited with a 2-0 rain-shortened victory.

Source:
Baseball Reference August 4
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game