The featured chart displays the near-surface average water mixing ratio reported by the Des Moines Airport for the first 21 days in June for years dating back to 1970. The value is simply the ratio of water mass to dry air mass. This year's value is nearly the highest during this period and the highest since 1994. All of this humidity helps to fuel the numerous thunderstorm complexes that have been relentless over the Midwest this June. Another complex is in Iowa this morning and more are expected this evening.

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