On 17 November 2009, to pass the earth by a stream of debris from comet 55P/Tempel-Tuttle. The dark, dusty debris stream was from the Leonids' parent comet more than 500 years old presented in 1466, astronomers from Caltech and NASA expect the Leonids to produce up to 500 meteors per hour. Forecasters define meteor storm as 1,000 or more meteors per hour. This is the 2009 Leonids a "sub-storms" would.
http://www.youtube.com/watch?v=Ir8U22_tzu8&hl=en
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