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What Is a SPECI and When Is It Issued?

Pilot Institute

You should monitor the temperature closely during winter or in colder regions since icing can impact both lift and control. 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). 3/4SM : Visibility of ¾ statute miles.