AVN
AVN : AViatioN model; one of the operational forecast models run at NCEP. The AVN is run four times daily, at 0000, 0600, 1200, and 1800 GMT. As of fall 1996, forecast output was available operationally out to 120 hours only from the 0000 and 1200 runs. At 0600 and 1800, the model is run only out to 72 hours
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