TABLE 1871 Heat Index Chart

1. Heat index values will be included in zone and city weather forecasts

2. Special weather statements and public information statements will be released with a detailed discussion of the extent of the hazard including heat-index values, who will be most at risk for heat injury, and safety rules for reducing the risk of heat injury

3. Assistance will be given to state and local health officials in preparing Civil Emergency Messages in severe heat waves which will include detailed medical information and names and telephone numbers of health officials

4. All of the above information will be released to the media and over the National Oceanic and Atmospheric Administration's Weather Radio.

FACTORS THAT DECREASE ABILITY TO DISPERSE HEAT Several factors can lead to a decreased ability to disperse heat (Ia.bl§.J..87-2). One of the most important of these is dehydration, which can develop quickly under intense heat stress. Even mild dehydration (as little as 1 percent) can impair physiologic and performance responses.12 It is estimated that every 1 percent decrease in body weight from dehydration results in a body temperature increase of 0.1 to 0.3°C (0.18° to 0.54°F). Dehydration impairs cardiovascular and thermoregulatory function by decreasing skin blood flow and sweating rate, leading to a decreased ability to disperse heat. Even when fluid is available, the human body is not able to assess fluid losses accurately and compensate by oral rehydration. Even when fluid is readily available to athletes during exercise, they will voluntarily ingest only 50 percent of their sweat loss and can rapidly become dehydrated. 5

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