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Henn's Phenomenon

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Henn's Phenomenon is a pararealistic meteorological phenomenon that occurs in an area preceding an event of great significance that occurs there, usually one to eight days before it happens. It occurs as a dense, humid fog that suddenly manifests into the area, regardless of whether or not the meteorological conditions are met to cause such weather. If tornado sirens are in the general area of the event, they will activate and begin roaring, and will harmonise perfectly regardless of where an observer may be, as long as the siren is provided with electricity. It was first discovered in Sarajevo on June 26th, 1914, two days before the assassination of Archduke Franz Ferdinand.

Organisations such as the UDSN and ASC frequently utilise Henn's Phenomenon as an early warning system for preventing pararealistic catastrophes, and proved to be a great help to prepare for events such as the 2003 Atlantic Trade Center Incident, the Raspatsya, and the 2004 Hallam Tornado. The latter of which convinced the U7-Council of the United Deep State Nations to officially integrate Henn's Phenomenon into UDSN operations after the EF4 tornado utterly annihilated Building 210, and would have killed all 439 UDSN personnel inside, were it not for Henn's Phenomenon occuring a mere two hours prior and prompting the Building Director to have 210 evacuated entirely.