Human perception and response to heat warnings

While much research has focused upon the evaluation of the heat – health relationship and its incorporation into newer heat watch-warning systems, no published study has examined the efficacy of the warning messages broadcast by local authorities. Do heat warnings significantly change the behavior of the general public? During summer 2004, an analysis of the perception and response of the elderly (those 65 and older) shall be undertaken across three cities: Dayton (Ohio), Philadelphia, and Toronto. All three cities have similar macro-climates, but dissimilar municipal structures and microclimates. Two hundred respondents in each city are queried within three days of a heat event about their perception of their own vulnerability, changes in daily activities, and knowledge of their municipality’s recommendations for how to deal with the oppressive weather. Several in-person follow-up interviews are conducted to ascertain the precautions taken and to further assess participants’ vulnerability by evaluating indoor ventilation, cooling methods, and their effectiveness.