This bulletin, written by J. Paul Dallavalle and Mary C. Erickson of the National Weather Service Techniques Development Laboratory, describes the format of the new Aviation (AVN) Model Output Statistic messages. The messages became operational during the 1200 UTC forecast cycle on May 30, 2000.

These messages contain forecasts of the:

Guidance is provided for projections of 6 to 72 hours for most weather elements.

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