The 630 facility in San Juan which rebuilt about 12 years ago gets quite a few reports from the Southeast, so if you hear Spanish, don't automatically think "Cuba" as NotiUno is also all talk and news, but with a more rapid pace delivery.
I've heard Spanish a few times on 630 in the Pensacola area. Usually undeneath, but sometimes fighting with, St. Louis. I couldn't identify it other than to establish that it wasn't Cuba.
I think you may have just unraveled the mystery. Thanks!