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Residents in the West Coast town of Kumara on Tuesday watched lights from the biggest solar storm in six years cast a strange grey-white glow across the sky.
Weather observer Gordon Sylvester first spotted the strange glow about 10pm, coming from the south-south-east. It got stronger as the night wore on, and was still there at 3.25am, when he got up for another look.
He said there was no source of light contamination, and the street lights were a more orange colour. Light reflection from Greymouth is to the north-west.
"I know what I'm looking for - I saw the big one in Nelson 12 years ago," Mr Sylvester said.