Hurricane Dora
Around 12:20 a.m. EST on September 10, Hurricane Dora made landfall about north of St. Augustine, Florida, with sustained winds between 115 and 125 mph (185 and 205 km/h). Although estimated to have been a Category 3 at landfall, the highest winds onshore were believed to have been in the Category 2 range. Striking northeastern Florida, Dora became the first tropical cyclone on record to make landfall in the region. Once onshore the storm gradually weakened, losing hurricane status about 24 hours later, and began a gradual turn towards the northeast. During the morning of September 12, Dora became almost stationary over the southern border between Alabama and Georgia. However, the storm rapidly accelerated and re-emerged into the Atlantic Ocean on September 14 near the Outer Banks of North Carolina. Hours after moving over water, the system transitioned into an extratropical cyclone. The remnants of Dora were last mentioned on September 16 off the northeast coast of Newfoundland.
Hurricane Donna
On August 29, a tropical wave exited the west coast of Africa near Dakar. That day, it is estimated a tropical depression developed along the wave southeast of Cape Verde. There was a lack of data for several days, but it is estimated that the system gradually intensified. On September 2, ships in the region suggested there was a tropical storm after reporting winds of over 50 mph (80 km/h). That day, the Hurricane Hunters flew into the system and observed a well-defined eye, along with winds of . Based on the data, the United States Weather Bureau office in San Juan, Puerto Rico, initiated advisories on Hurricane Donna at 22:00 UTC on September 2, about east of the Lesser Antilles. It is estimated that the storm attained hurricane status a day prior. The Azores High to the north was unusually powerful, which caused Donna to move to the west-northwest. When advisories began, Donna was intensifying into a major hurricane, which is the equivalent of a Category 3 or higher on the Saffir-Simpson hurricane wind scale; it would ultimately maintain this status for nearly eight days.