Abstract
Weather-related hazards are the result of interactions between the physicalenvironment and the demographics of the community that experience them.Numerous studies have documented urban heat island (UHI) modification ofcloud-to-ground lightning flash densities, but none have linked flashes to theunderlying demographics. In this study, I compared flash and housing densitiesfor 25 counties encompassing Atlanta, Georgia, using ordination andcartographic visualization. Over the interval 1992-2000, two denselypopulated suburban counties downwind from Atlanta (Gwinnett and Dekalb)exhibited the highest cloud-to-ground flash densities. By contrast, highpopulation density counties located upwind (Cobb) and encircling the centralcity (Fulton) had relatively lower flash densities. Based on the interactionsamong demographics, flash density, and geographic position for a subset ofcounties, I outline four types of urban lightning hazards: emergent,UHI-augmented, UHI-suppressed, and non-interactive. For urban lightninghazards, the often invoked idea of `more people equals more hazards' is to anextent simplistic. Urban areas have a large range of lightning hazards asheating nodes emerge, intensify, and shift in response to historicallycontingent patterns of growth.
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Stallins, J.A. Characteristics of Urban Lightning Hazards for Atlanta, Georgia. Climatic Change 66, 137–150 (2004). https://doi.org/10.1023/B:CLIM.0000043135.13801.71
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DOI: https://doi.org/10.1023/B:CLIM.0000043135.13801.71