Wierdest thing I ever saw (possibly ball lightning) was a globe of yellow green light that descended about 300 metres from where I live (11kms North West of Sydney CBD) - falling about 10 metres a second - fairly constant for about 15 seconds then it just flared for a second or two - at about 100 metres off the ground - lit everything up and totally dissappeared. I'm pretty sure it wasn't a flare - it only lasted around 10 - 15 seconds all up and travelled maybe just over 100 metres in that timeframe, descending gently against a stiff breeze from about 250 metres up to 150 meters elevation. It was a damp, wet evening with little lightning - and I was on my second story deck watching is just the right direction at around 2am when it occurred.
Left me pleasantly puzzled as to what could be - unlike a flare it was bigger than a scoccer ball - say 45 cm - 60 cm wide circle of really sickly coloured, light. Ball lightning is the only thing I've every heard of that fits the bill (a plasma ball that drifts weirdly, illuminates then dissappears). Really cool and really quite close. No noise - and like I said moved sedately and not affected by the wind. Never seen anything (even in a chemistry lab) burn that greenish yellow before.
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