Unfortunately for the hoard of bike riders in Des Moines on Wednesday, the forecast hot and humid conditions verified and then some with the Des Moines Airport topping out at a heat index of 110 degrees! The featured chart presents the yearly maximum heat index based on available hourly reports. The top panel shows the frequency of years having a maximum heat index of at least the given level. So 110 on that chart comes in at about 40%, so only four out of ten years. The bottom panel shows the yearly maximum value, and yesterday's value was the highest since 2019. Unfortunately, more heat and humidity is in store for Thursday and especially Friday.

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