Potential Tropical Cyclone Ten

Beginning in 2017, the National Hurricane Center (NHC) decided to issue advisories, and thus allow watches and warnings to be issued on disturbances that are not yet tropical cyclones but have a high chance to become one, and are expected to bring tropical storm or hurricane conditions to landmasses within 48 hours. Such systems are termed "Potential Tropical Cyclones". Advisories on these storms contain the same content as typical tropical cyclone advisories, including track forecasts, and cyclone watches and warnings, similar to advisories that the NHC issues on active tropical cyclones. This was first demonstrated on June 18 with the designation of Potential Tropical Cyclone Two, which later developed into Tropical Storm Bret, east-southeast of the Windward Islands. In addition, the numbering that a potential tropical cyclone receives would be retained for the rest of the hurricane season, meaning that the next tropical system or disturbance would be designated with the following number, even though potential tropical cyclones are not treated as tropical cyclones. This was first demonstrated with Potential Tropical Cyclone Ten, which failed to develop into a tropical cyclone. Potential Tropical Cyclone Ten was the first system so designated not to become an organize as a tropical cyclone. ==Meteorological history==

At the beginning of August 13, the National Hurricane Center (NHC) began monitoring a tropical wave on the western coast of Africa, which quickly emerged into the eastern Atlantic. Amid favorable environmental conditions, the wave was expected to merge with a broad area of low pressure southwest of Cape Verde and gradually organize thereafter. The system farther to the west accelerated further and eventually developed into Tropical Storm Harvey on August 17 (which later became a hurricane), while the tropical wave to the east lagged behind. On August 18, the disturbance behind Harvey became increasingly organized and was given a 70% chance of developing into a tropical cyclone within 2 days; however, increased wind shear weakened the system and prevented it from attaining full tropical characteristics. The disturbance remained disorganized while moving northwestward over the next several days, reaching the Bahamas on August 21. The disturbance crossed south Florida on August 23, and stalled to the west of the peninsula for the next two days. On August 25, the storm moved over central Florida and stalled there for two days, before emerging off the east coast of Florida on August 27. Late on August 27, the system organized significantly off the coast of Georgia; as the system was expected to develop into a tropical cyclone within 2 days and posed a hazard to the Southeastern United States, the NHC designated the storm as Potential Tropical Cyclone Ten and initiated advisories on the storm. At the time of its designation on August 27, Potential Tropical Cyclone Ten was given a 90% chance of becoming a tropical storm within the next 2 days. However, the storm remained disorganized and lacked a closed low-level circulation. As the system accelerated to the northeast, the storm expanded in size, though it grew increasingly disorganized. As the storm moved past the Carolinas, on August 29, the disturbance brought thunderstorms to the region, in addition to tropical storm-force winds. During the next couple of days, Ten's extratropical remnant quickly intensified, while accelerating to the northeast. On August 31, at 12:00 UTC, Potential Tropical Cyclone Ten's remnant reached a peak intensity of to the south of Newfoundland, with hurricane-force sustained winds at 75 mph (120 km/h). Later on the same day, Potential Tropical Cyclone Ten's remnant was fully absorbed by the larger extratropical cyclone, southwest of Iceland. This extratropical system was named Windstorm Perryman by the Free University of Berlin on September 4; Windstorm Perryman subsequently impacted Ireland and the United Kingdom. ==Preparations and impact==

Florida During the system's time in Florida, the storm caused torrential rainfall and also triggered flooding across the state, especially in southwestern Florida. The floods were described as the worst that western Florida had seen in at least 20 years. Lee County was the hardest hit, particularly the Island Park neighborhood in the southern part of Fort Myers. On Monday, August 28, water levels peaked at a depth of on Island Park Road, on US Route 41. Flooding from the storm forced the rescue of more than 200 people and 37 animals, all of whom were evacuated. In Manatee County, up to of rain fell from August 26 to 28, causing numerous instances of street flooding, floating cars on State Road 70, and forcing the rescue of one person. In the Longbeach area, floodwaters entered numerous homes and businesses, with 67 homes experiencing over a foot (0.3 meters) of water, mostly in the Centre Lake Community, forcing the families living there to evacuate; water also entered homes along Manatee Avenue West around 38th Street West. In Fort Myers Beach, in Lee County, heavy rainfall from August 27 to 28 resulting in localized flooding, with floodwaters breaching mobile homes in Estero and Bonita Springs. The floods forced the evacuation of 70 people from a mobile home park in Estero, and another 116 people were forced to evacuate from a mobile home park in Bonita Springs, due to rising floodwaters from the Imperial River. The floods in Fort Myers Beach caused $100,000 (2017 USD) in property damage. In the neighboring Sarasota County, a maximum total of of rain fell across the area from August 26 to 28, which caused numerous instances of street flooding, and resulted in $50,000 (2017 USD) in property damage. The disturbance was also responsible for severe weather in Florida. From August 23 to 28, at least 21 storm reports were filed, including multiple instances of wind damage from severe thunderstorms. On August 26, at 8:19 p.m. EDT, an EF0 tornado touched down in Samoset, in Manatee County, before lifting three minutes later, at 8:22 p.m. EDT. A couple of witnesses reported seeing a funnel cloud in the area around the time when the tornado touched down. Overall, the storm killed two people in Florida and caused more than $1.923 million (2017 USD) in damages. Less than two weeks later, Hurricane Irma made landfall in southwestern Florida, which further compounded the damage in the region. Elsewhere On August 27, the NHC anticipated Potential Tropical Cyclone Ten to develop into a tropical storm within 48 hours, and as such, they issued Tropical Storm Watches and Warnings for the Carolinas on August 27. However, the impacts in the Carolinas were rather minimal. After Potential Tropical Cyclone Ten transitioned into an extratropical storm, the system brought tropical storm conditions to Atlantic Canada, including gusty winds and high surf, with the Canadian Hurricane Centre (CHC) issuing an alert for the area. ==See also==