Excessive Heat in Yankton, South Dakota

Excessive Heat August 21, 2023 – August 24, 2023 · Yankton, South Dakota

Death

What the National Weather Service wrote

Daily afternoon and evening heat indices ranged from 100 to 115 degrees with a maximum heat index of 115 degrees at Automated Weather Observing System site KYKN at Yankton on August 21. A direct fatality occurred in Yankton on the third day of excessive heat when a child was left in a vehicle for an extended time. At the time of the incident, the heat index was 112 degrees with an air temperature of 100 degrees.

The wider storm

An immense ridge of high pressure over the Central Plains and Mississippi Valley entrenched heat and high dewpoint air across the region, resulting in daily heat indices from 100 to around 120, with very little recovery during the overnight hours. One direct fatality occurred when an infant was left in a vehicle for an extended period of time during the day in Yankton.

Source: NOAA Storm Events Database, event 1138230. Narratives are written by the National Weather Service forecast office that issued the report.

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