Precipitable water is a measure of the depth of water within a column of the atmosphere if all available water fell as rain. The featured map presents a climatology of this value over Iowa during January based on some Iowa-only archives of a weather model called NAM. This value has many uses in forecasting including assessing of how intensely it can rain given storms. Values shown range from about 0.25 to 0.33 inches and indicate the general lack of moisture this time of year due to air at cold temperatures holding less water.

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