Mother Nature has forced organizers of this weekend's Med City Marathon to modify the runs on Sunday. They are urging anyone that is not well conditioned for the race to consider withdrawing.

An email sent to all participants said: "The Med City Marathon full distance marathon, 20 mile race, and marathon relay scheduled for May 27th have been shortened due to the extreme heat forecasted.  This decision was made by the race organizers and Mayo Clinic Sports Medicine team together, and was based on evidence-based temperature criteria for marathons.  The decision was made in the best interests of the runners, as the high temperatures create significant risk for serious, and sometimes fatal, heat related conditions, especially in runners who are not acclimatized to the heat." 

Stay hydrated if you are running, volunteering, or just going to cheer on friends and family.