High Quality Content by WIKIPEDIA articles! The 1999 Bridge Creek – Moore tornado was an extremely powerful F5 tornado which devastated towns just outside of Oklahoma City on May 3, 1999. Throughout its one hour and 25 minute existence, the tornado covered 38 mi (61 km), destroying thousands of homes, killing 41 people and leaving $1 billion in losses behind. This ranks the tornado as the third costliest on record, not accounting for inflation.