The National Weather Service has two alert types to cover when dangerously hot conditions are forecast, the Heat Advisory and Excessive Heat Warning. These alerts are presently tied to the heat index and have a regional threshold that varies. For Iowa, the Heat Advisory generally covers when the heat index reaches 105 and the Excessive Heat Warning when it exceeds 110. Such was the case in Iowa on Monday with western Iowa receiving the worst of the heat. The featured chart presents the combination of heat index readings for Sioux City and coincident alerts from NWS Sioux Falls. Tuesday will be not quite as warm for most of the state as Monday with a few days of more pleasant temperatures forecast after that.

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