The featured chart presents daily values of precipitable water from the NAM forecast model provided by BUFR data analysis for Des Moines. This value represents the depth of liquid water if all the water in a column of air was converted into a liquid form. In general, higher values allow showers and thunderstorms to become more efficient rain producers. The past few days have seen relatively low values of precipitable water and the result has been dry weather and pretty blue skies. Values for this variable increase during the summer reaching totals above two inches.

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