9月13日，佛罗伦萨表现出热带风暴的不可预测性倾向，随着飓风临近北卡罗来纳州的海岸，佛罗伦萨飓风将放缓。仍有3级风暴，最大持续风为125 mph，佛罗伦萨预计第二天会在越野前进。周六清晨在北卡罗来纳州和南卡罗来纳州边境周围登陆。

The prospect of days of pounding waves increase the probability of overwash and erosion along barrier islands, as well as coastal storm surge pressing inland and up estuaries beyond the coastline. The National Weather Service's Tropical Analysis and Forecast Branch reported open ocean wave heights as high as 83 ft in Florence's northeast quadrant. According to the agency, these waves are produced by being trapped along with very strong winds moving in the same direction as Florence's westward track.

北卡罗来纳州东南部的地区可能会看到20英寸或更多的降雨，而南卡罗来纳州内陆目前预计将获得6至15英寸。预期的洪水对该州的公共和私人水坝的安全提出了担忧，几十个在2015年的1000年降雨活动中失败了。

South Carolina Dept. of Health and Environmental Control (DHEC) spokesperson Tommy Crosby says the agency is prioritizing the assessment of dams located in areas predicted to receive large amounts of rain. As of Sept. 11, the agency had assessed 181 dams "to help dam owners ensure their dams are set in the safest condition possible." Crosby says. The dam assessments are prioritized according to various criteria, such as being in the evacuation zone or along the evacuation routes. Dams that are under repair or have a known history of problems are also given high priority.

DHEC还实施了一个警报系统，以通知2,000多个水坝所有者，需要评估其水位并与下游的其他所有者协调降低水平，以避免洪水泛滥。

预计到9月17日，佛罗伦萨预计将削弱南卡罗来纳州西部西部的热带抑郁症，佐治亚州的环境保护部正在与东南部其他州大坝计划进行协调。代理商发言人说，州大坝安全专家也准备根据需要做出回应。

道路建设停止

同样在佐治亚州，运输部也暂停了其主要东部州际公路（II-20，I-16和I-95）的道路建设，以确保撤离和响应工作的能力。

The U.S. Army Corps of Engineers says it has received 13 mission assignments for Hurricane Florence, including debris management and infrastructure, and water and wastewater facility assessments.

Hurricane preparations are a familiar story for a Robins & Morton project team building an 11-story, 625,000-sq-ft hospital for the Medical University of South Carolina in Charleston. In 2016, despite the team's best efforts, Hurricane Matthew completely flooded the jobsite along with the rest of the facility.

With the facility now nearing completion, the project team has taken pre-storm steps, such as moving unsecured equipment into core sections of the building, lowering the tower crane and boarding up structural openings. A webcam will help Robins & Morton monitor the building's condition as Florence moves across the region.