BY JULIANA KEEPING jkeeping@opubco.comThe Emergency Medical Services Authority has issued a heat alert after nine people fell ill with symptoms of heat-related illnesses Monday. EMSA issues the alerts when it responds to heat-related calls for more than five people in 24 hours, spokeswoman Lara O'Leary said. During a heat alert, people should avoid extended time in the sun; wear light-colored, loose clothing; take frequent breaks and pace themselves throughout the day.Read more on NewsOK.com