At roughly 3:15 p.m., the rain was falling harder, and the officials decided that the track was "lost." They judged there was not sufficient time left in the day to wait out the shower, dry the track once again, and complete the final 97 laps.
At approximately 3:15 p.m., the rain was intensifying, and the officials deemed that the track had "failed." They concluded there wasn't enough time left in the day to wait out the shower, dry the track again, and finish the remaining 97 laps.