Lightning/Thunderstorm rule (extract from ECA Senior Rules)

In the event of an active thunderstorm, lightning or electrical storm in the immediate vicinity of the ground the following is to apply:

(i) play is to cease IMMEDIATELY and all players and umpires are to find safe shelter without delay. Safe shelters include large substantial buildings with electric or telephone wiring and/or plumbing that provide a safe current to the ground. Players and others should not remain in open areas or take refuge beneath trees. Once play has ceased covers must not be laid.

(ii) To determine what is ‘in the immediate vicinity’, players and Umpires should follow the “30/30” rule:
a. Play must stop when the time between a lightning flash and thunder bang is 30 seconds or less since this indicates that the lightning is 10km away. This creates a significant risk that the next lightning strike could be at observer’s location.
b. Play must only commence 30 minutes after both the last lightning flash and last thunder bang.