A 40 percent chance of morning showers and thunderstorms on Sunday could make for soggy conditions at the Oklahoma City Memorial Marathon.
But what if damp goes to dangerous?
Lightning, hail, high winds and worse can be part of spring thunderstorms in Oklahoma, and marathon officials say conditions will be monitored constantly. Those conditions will then be conveyed via colored flags at the 17 medical aid stations along the race course.
Runners and spectators are encouraged to know what the colors mean:
White: No risk.
Green: Good conditions.
Yellow: Less than ideal.
Red: Potentially dangerous.
Black: Extreme. Event canceled.
If the race were to be halted, postponed or called off, the course would be evacuated. Officials on the course would direct runners to safe shelters where they would await transportation back to the start/finish area.