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pwv_kpno models the atmospheric absorption due to H2O at Kitt Peak National Observatory. It provides atmospheric models from 3,000 to 12,000 Angstroms for years 2010 onward. The pwv_kpno package uses published SuomiNet data in conjunction with MODTRAN models to determine the modeled atmospheric transmission function at Kitt Peak in close to real time. The package also provides automated retrieval and processing of SuomiNet data, allowing photometry to typically be corrected within an hour of observation.