The increase in humidity on Tuesday was noticeable as warm and moist air was drawn northward ahead of an approaching cold front. The featured chart presents IEM computed daily average mixing ratios for Ames. This parameter is a direct measure of the amount of water vapor in the air and is expressed as the faction of water vapor to all other gases. The bottom panel shows the daily departure from a simple period of record average for Ames and the positive departure from yesterday sticks out vs the recent number of weeks that have featured seasonally dry air.

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