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Why does shortening a hazards valid time result in an EXT?

April 26, 2017ext hazard Shortening time valid

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Why does shortening a hazards valid time result in an EXT?

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• EXT, and EXB by the same account, denotes a change in the valid time of a hazard, not just lengthening it. So if a hazard start time is pushed back or end time moved up, this change in time results in an EXT. If new areas were also added, an EXB would result.