Australian Weather Calendar: November 2017
Helen Day knew from the Bureau's rain radar that a storm was coming to Longreach, Queensland. She set up outside the Australian Stockman Hall of Fame for two hours to catch this strike.
Lightning occurs when the negative electrical charge in the lower part of a cloud and the positive charge in the upper part become so great that they overcome the resistance of the air and discharge between negative and positive takes place. Lightning can occur within the cloud, between clouds, or between clouds and the ground. Thunder is the sound produced by the explosive expansion of air, which lightning can heat to 30 000 °C.