18z is 1 PM EST (or 2 PM EDT)
In the military: 18 “zulu”.
18z = 18 UTC, “Coordinated Universal Time” ( what used to be called 18 Greenwich Mean Time or 18 GMT.
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Many major models are run at 00z, 06z, 12z, and 18z and their model run names include the zulu time and date of the run.