Thunder and lightning necessitates that contests be suspended. The occurrence of thunder and/or lightning is not subject to interpretation or discussion - thunder is thunder, lightning is lightning. With your site administrator, set up a plan for shelter prior to the start of any contest.
When thunder is heard and /or lightning is seen, the following procedures should be adhered to;
Suspend play and direct participants to go to shelter, a building normally occupied by the public or if a building is unavailable, participants should go inside a vehicle with a solid metal top (e.g. bus, van, car).
Do not permit people to stand under or near a tree; and have all stay away from poles, antennas, towers and underground watering systems.
After thunder and /or lightning have left the area, wait 30 minutes after the last boom is heard or strike is seen before resuming play or competition.