Huntsville Emergency Medical Services says heat-related medical calls on the rise The sweltering weather in North Alabama is causing more people to experience heat exhaustion and heatstroke. Posted: Jul 29, 2021 5:34 PM Updated: Jul 29, 2021 8:24 PM Posted By: Grace Campbell Thursday's the hottest day we've experienced in North Alabama so far in 2021. HEMSI spokesman Don Webster said they saw the most amount of heat-related calls on Wednesday than any other day this year. WAAY 31 spoke with HEMSI to learn how you can protect yourself and others in this sweltering heat. Normally on a bright sunny day, Big Spring Park would be filled with people. While Thursday was a bright and sunny day, it was also in the high 90s. Being out in those temperatures for a long time can lead to heat exhaustion, and even worse, heatstroke.