Before the formation of Hurricane Kate, a
ridge was located across the southeastern United States for much of the autumn of 1985; concurrently, a major
trough persisted across the western portion of the country. As a result, weather conditions across the
Gulf of Mexico and western Atlantic Ocean in November were more typical of a pattern in late September, including
sea surface temperatures of 81 °F (27 °C). On November 13, a weak
tropical wave began interacting with a trough to the northeast of the
Lesser Antilles. It gradually organized due to the favorable conditions, and on November 15, a
Hurricane Hunters flight into the area indicated the
development of a
tropical cyclone. As gale-force winds were already present, the system was immediately declared Tropical Storm Kate, about 240 miles (385 km) northeast of
San Juan, Puerto Rico. With a ridge to its north, Kate tracked westward after developing, and an
upper-level low developed to the southwest of the storm. The combination of the two provided favorable
outflow, allowing Kate to quickly intensify. On November 16, the storm attained hurricane status while moving through the southeastern
Bahamas. When it moved ashore, Kate had a
pressure of and winds of about . The hurricane maintained its well-defined eye while moving across northern Cuba, and about 12 hours after making landfall, it emerged into the southeastern Gulf of Mexico just east of
Havana. Over the next 24 hours, Kate re-intensified off the southwest coast of Florida as it passed about 85 mi (135 km) southwest of
Key West. On November 20, the Hurricane Hunters observed winds as strong as 125 mph (200 km/h), and a
buoy recorded a gust of ; Based on these observations, it was estimated that Kate attained peak winds of about around 1200 UTC on November 20. After landfall, Kate continued to the northeast, crossing into Georgia and weakened into a tropical storm. Kate emerged from North Carolina into the Atlantic Ocean late on November 22. Encountering even colder waters and continued shear, the storm weakened further while turning to the east-southeast. On November 23, Kate transitioned into an
extratropical cyclone to the west of
Bermuda, terminating at 1800 UTC that day. With Kate's landfall, the 1985 season had six hurricanes that struck the United States, only one short of the record seven in
1886. ==Preparations==