The relatively new NARR is a higher resolution dataset for use in atmospheric research. It, like other reanalyses, is only an estimate of the state of the atmosphere and, therefore, may not match observations. Usually, this is especially true of the precipitation field, but the NARR, unlike the other two popular reanalyses used in this study, incorporated precipitation observations in its assimilation and integration process. This gave the NARR precipitation more potential for use. To establish its reliability and the reliability of the other two reanalyses and to judge their usefulness, the spatial distribution, diurnal cycle, and annual cycle of precipitation are explored. Results show that while the NARR provides a much improved representation of precipitation over that of the other reanalyses examined, it does contain some inaccuracies and these have been highlighted as a warning to potential users of the data.
This work has been submitted to the Journal of Hydrometeorology under the same title. Until publication, it will be available at: http://weather.ou.edu/~bukovsky/reanalysis_note_revised.pdf