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What Is a SPECI and When Is It Issued?

Pilot Institute

This can be when the weather stabilizes or when another report is issued. 011955Z : The date and time of issuance (first day of the month at 19:55 UTC). “TSB25” shows a thunderstorm began at 19:25 UTC, and “TS OHD MOV E” means a thunderstorm is overhead, moving east.