Heat and humidity continues to build this week with a return to hot conditions forecast for next week. To warn for dangerous levels of heat, the NWS has event headline types known as a Heat Advisory and Excessive Heat Warning. These products are generally guided by heat index values with some time duration requirements. The featured chart presents a simple frequency of these headline types by observed heat index at the Ames Airport weather station. While these point in time observations don't account for the duration requirements, the chart is still informative as values exceeding 105 degrees are more often than not covered by a headline and values above 110 are rarely not coincident with a headline.

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Tags:   heatindex