Brown, Daniel (October 3, 2018). Hurricane Sergio Discussion Number 17 (Report). National Hurricane Center. Archived from the original on October 2, 2019. Retrieved October 7, 2018.
Brennan, Michael (October 5, 2018). Hurricane Sergio Discussion Number 23 (Report). National Hurricane Center. Archived from the original on October 2, 2019. Retrieved October 7, 2018.
Stewart, Stacy (October 7, 2018). Hurricane Sergio Discussion Number 31 (Report). National Hurricane Center. Archived from the original on October 2, 2019. Retrieved October 7, 2018.
Zelinsky, David (October 7, 2018). Hurricane Sergio Discussion Number 33 (Report). National Hurricane Center. Archived from the original on October 2, 2019. Retrieved October 8, 2018.
Brown, Daniel (October 3, 2018). Hurricane Sergio Discussion Number 17 (Report). National Hurricane Center. Archived from the original on October 2, 2019. Retrieved October 7, 2018.
Brennan, Michael (October 5, 2018). Hurricane Sergio Discussion Number 23 (Report). National Hurricane Center. Archived from the original on October 2, 2019. Retrieved October 7, 2018.
Stewart, Stacy (October 7, 2018). Hurricane Sergio Discussion Number 31 (Report). National Hurricane Center. Archived from the original on October 2, 2019. Retrieved October 7, 2018.
Zelinsky, David (October 7, 2018). Hurricane Sergio Discussion Number 33 (Report). National Hurricane Center. Archived from the original on October 2, 2019. Retrieved October 8, 2018.