>> reporter: these motor "rick's list"s were stuck. a swath of tropical moisture drenched the gulf coast to the carolinas. in miami beach, an elderly couple was killed while swimming. >> they were in cardiac arrest. we worked them to the hospital. they were pronounced dead. >> reporter: they weren't alone. they came to the aid of at least 50 swimmers. here is what we are talking ability t. tropical moisture in the yucatan over the weekend. this has been cruising into the area all weekend long and still, currently, we are dealing with this. it's all the way from friday. let's talk about what is going on. look at the amount of rainfall they have seen since friday, almost 10 inches. pensacola, 6.61 inches. it's moving into the carolinas. this is a surplus since june.