The heat and humidity weather knobs are again turned well to the right with heat index values expected above 100 degrees for much of the state today. Accordingly, the NWS has a Heat Advisory covering most of the state. The featured chart presents the frequency of the NWS having a heat related headline active for Story County (where the Ames Airport weather station resides). This frequency is based on hourly reports and the major caveat is that having a very hot instantaneous index does not necessarily warrant a headline issuance by the NWS. These headlines typically require a consecutive stretch of hours with high heat indices along with little overnight relief. Heat impacts tend to be cumulative as prolonged exposure to heat decreases resilience.

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Tags:   heatindex