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1) Meteorological (most common association):
Extremely severe and inclement weather. In particular, when bad weather comes as a surprise following an optimisitc forecast.

2) A person or thing that is believed to bring bad luck (Jinks or Jinx)

3) A condition or period of bad luck that appears to have been caused by a specific person or thing.
The sudden and surprising change in weather that resulted in the tsunami is thought to have been caused by The Jinks Effect.
by Weatherman September 12, 2012