"Seems that people are finally heeding warnings" about staying hydrated and staying indoors, said Dr. Dave Plummer, an emergency department physician at Hennepin County Medical Center in Minneapolis, where a combination of heat and humidity made it feel like 109 degrees over the weekend.
While he's seen more critically ill patients for heat-related sickness than usual, fewer than expected have come to the ED seeking treatment for mild illness or a seat in an air-conditioned waiting room -- typically par for the course on high-heat days.
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"It's amazing that we've had so little of that," he said — especially in a place like Minnesota, where residents are used to chillier temperatures, making them less able to deal with a heat wave. But Plummer said it may be that Minnesotans have become adept at all forms of environmental protection, applying skills for evading extreme cold to dodging severe heat.
Heeding the Message
Dennis Allin, MD, chair of the emergency department at the University of Kansas Medical Center in Kansas City, said his hospital has seen fewer severe cases of heat sickness than expected for a city whose heat index was pushing 110 -- a fact he also attributed to greater awareness.
But he was cautious that it's "still early in our heat wave." According to the National Weather Service, high temperatures will continue to bare down on the region through the rest of the week.
That's why public health departments across the Midwest are on guard, beefing up health warnings on their websites and taking steps to prevent emergencies. Chicago's deputy health commissioner Jose Munoz issued an extreme heat alert last weekend, telling residents to crank the AC and chug water.
Public health officials in Des Moines, Iowa, have opened more than a dozen cooling centers across the city, including an overnight one, according to Rick Kozin, a spokesperson for the department.
Though it's typical to throw open the overnight center's doors for one or two evenings during any given summer, this time they may stay ajar for a longer stretch of consecutive nights than ever before, Kozin said.
"It's been a long time since we've seen an event like this," he said.
National Weather Service data back up his judgment -- for Iowa and Illinois, the agency called it the "most significant heat wave the region has experienced in at least the last five years." Over the weekend, the heat index was a suffocating 126 degrees in Des Moines.
The overnight cooling centers may be critical, as the combination of relentless heat and humidity that doesn't subside even at night is what can really drive the increased risk of heat stroke and exhaustion, the agency said.
"Each day in an event like this makes it that much harder for people to deal with the next one," Kozin said.