Here is a list of the 29 counties that the Jacksonville Skywarn Association and the Jacksonville NWS covers for weather reporting:

Georgia Counties
 
1. Appling
2. Atkinson
3. Bacon
4. Brantley
5. Camden
6. Charlton
7. Clinch
8. Coffee
9. Echols
10. Glynn
11. Jeff Davis
12. Pierce
13. Ware
14. Wayne
Florida Counties
 
1. Alachua 
2. Baker
3. Bradford
4. Clay
5. Columbia
6. Duval
7. Flagler
8. Gilchrist
9. Hamilton
10. Marion
11. Nassau
12. Putnam
13. St. Johns
14. Suwannee
15. Union