Low Level Prognostic Chart. Aviation weather center n o a a n a t i o n a l w e a t h e r s e r v i c e. Low altitude significant weather charts are issued four times a day and are valid at the following fixed times:
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00:09 utc | 05:09 pm pacific | 06:09 pm mountain | 07. Aviation weather center n o a a n a t i o n a l w e a t h e r s e r v i c e. Low altitude significant weather charts are issued four times a day and are valid at the following fixed times:
