There are currently five choices - avn, eta, meso, ngm, and ruc. The model names must be in small letters. LVL - this is the level of the model you want to examine. As noted above only mandatory level data is available in the AVN, every 50 mb in the NGM, Eta, and RUC, and every 25 mb in the meso-eta. This will produce a 900 mb map of frontogenesis, potential temperature, and wind from the 09 h forecast of the 0900 UTC 3 August 1999 Ruc model centered upon Wisconsin.
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