Chicago’s dense infrastructure of asphalt, concrete, and brick absorbed heat during the day and radiated it back out at night. Brick apartment buildings became literal ovens, trapping high heat-index conditions indoors where air conditioning was absent. 2. Infrastructure Failure
The city, true to itself, continued to warm and cool, to invent rites and abandon others. But people now had a ritual: each year, in mid-July, the community read aloud a page or two from the index. They passed paper crowns, they sprayed misters over palms, they counted the seconds that an old man stood in shade. They called it an Index Day, though it had more the quality of a small festival—part liturgy, part experiment. They kept the custom because the index taught one useful thing: observation is a kind of care. index of heat 1995
What transformed this heat dome into an unprecedented disaster was the moisture profile of the air mass. Weeks of heavy rainfall prior to July had saturated the soil across the Great Plains and Midwest. As the intense summer sun beat down on the wet ground and mature cornfields, a process known as evapotranspiration pumped billions of gallons of water vapor into the lower atmosphere. The result was a record-breaking influx of humidity: Infrastructure Failure The city, true to itself, continued