The closest place to you that is shown in the list is Miami. Have you set that in SETTINGS/LOCALIZATION on the outer portal menu? I just tried on my Mag254 and when I selected Miami it showed the correct time zone. (Tip: use the keyboard (KB) to type in the name, close KB and select from the list)
I also noticed an error in the reported temperatures, way off... then I found that they pull the weather report from my local airport and it was the airport that was reporting with the error.