Excessive Heat Advisory (Heat Advisory)
Excessive Heat Advisory (Heat Advisory) : National Weather Service Definitions. Issued if the maximum Heat Index (HI) is expected to be around 105. Longer durations of heat conditions just under advisory criteria can also pose a risk to the public. With this in mind, NWS offices should collaborate with their neighbors and consider issuing a heat advisory if the Max HI is expected to be 100 to 105 degrees for 4 or more consecutive days. Finally, NWS offices should issue an EXCESSIVE HEAT WARNING if advisory criteria are expected to be met for 4 days or more. The use of the word "around" conveys a range of +/- two degrees on either side of the base criteria to give WFO forecasters flexibility especially during marginal events. Base criteria may also be adjusted, typically in urban areas, to match agreements with healthcare partners. Adjustments to base criteria should not be made for cities with less than 200,000 people. NWS Kansas City has additional guidance available through Heat Health Warning System algorithms. This tool is separate from the guidance criteria established in this supplement. Blending all available guidance into a cohesive decision making process is left to local management. The NWS may consider revising its heat advisory, watch and warning definitions every few years based on more current historical meteorological conditions and evidence of heat-attributable adverse health impacts. Local government staff, public health professionals and other organizations that participate in planning and/or providing services for preventing heat-related illnesses should identify the NWS station for their jurisdiction and build relationships with the NWS staff to ensure receiving the most current information available on predicted extreme heat events
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