Heat Advisories are up for a good portion of the middle US with very hot and muggy conditions expected. Of course, the calendar is almost July so one would expect to see hot and humid weather, but even so heat index values are expected to be well above 100 degrees which is not your ever-day summer weather. The featured chart looks at the period each year between the first and last issued Heat Advisory by NWS Des Moines since 2006. This year got off to an early start to pick up where the late finish of 2017 ended with.

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