Abstract
A recently published article by Errico et al. (2007, hereafter EBM) attempts to review issues involved in the assimilation of cloud and precipitation observations in atmospheric data analyses. The review is properly motivated by a desire to bring attention to obstacles in resolving two important problems in atmospheric data analyses. These are: 1) Utilizing satellite observations that are currently discarded in operational atmospheric data assimilation systems because of high sensitivity to clouds and precipitation, and 2) estimating the hydrologic state of the atmosphere (i.e., hydrometeors) together with standard atmospheric fields of temperature, humidity, pressure, and wind. Despite the appropriate motivation, and for most part adequate identification of main issues, the review has two important shortcomings. First, the review is inaccurate and incomplete when referring to past published research results. Second, some conclusions and recommendations are contradictory to each other. In the following comments these shortcomings are addressed.
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