The featured chart presents hourly relative humidity for Ames since 1 July. The recent dive downward in RH is noticeable on the chart and is painfully noticeable for those with respiratory and/or skin sensitivities to dry air. The cause is certainly related to the worsening drought and end of growing season, which both have eliminated sources of atmospheric water vapor. The lack of humidity has also allowed very cold low temperatures to materialize this week. With rain chances in the forecast for late this weekend and next week, one wonders how this persistent dry air will put a damper on the much needed rainfall.

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