Stewart, Stacy (June 28, 2021). Tropical Depression Four Discussion Number 1. www.nhc.noaa.gov (Report). Miami, Florida: National Hurricane Center. Archived from the original on June 29, 2021. Retrieved June 29, 2021.
Stewart, Stacy (June 28, 2021). Tropical Storm Danny Discussion Number 2 (Report). Miami, Florida: National Hurricane Center. Archived from the original on June 29, 2021. Retrieved June 29, 2021.
Cangialosi, John (June 28, 2021). Tropical Depression Danny Discussion Number 3. www.nhc.noaa.gov (Report). Miami, Florida: National Hurricane Center. Archived from the original on June 29, 2021. Retrieved June 29, 2021.
Stewart, Stacy (June 28, 2021). Tropical Depression Four Discussion Number 1. www.nhc.noaa.gov (Report). Miami, Florida: National Hurricane Center. Archived from the original on June 29, 2021. Retrieved June 29, 2021.
Stewart, Stacy (June 28, 2021). Tropical Storm Danny Discussion Number 2 (Report). Miami, Florida: National Hurricane Center. Archived from the original on June 29, 2021. Retrieved June 29, 2021.
Cangialosi, John (June 28, 2021). Tropical Depression Danny Discussion Number 3. www.nhc.noaa.gov (Report). Miami, Florida: National Hurricane Center. Archived from the original on June 29, 2021. Retrieved June 29, 2021.