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Wilmington, North Carolina once had a thriving Black middle class and an elected interracial government. In 1898 white supremacists used violence to overthrow that government, kill Black residents and drive many others from the city.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
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| Vortex Spring | |
|---|---|
 Main pond at Vortex Spring | |
  Location within Florida  Location within the United States | |
| Coordinates | 30°46′17″N 85°56′53″W / 30.77149°N 85.94812°W |
| Dive type | Training, Open-water, Deep, Cave |
| Depth range | 20 to 115 ft (6.1 to 35.1 m) |
Bottom composition | Rock |
Vortex Spring is a commercially operated recreation, camping and dive park located near Ponce de Leon, Florida. It is the largest diving facility in the state of Florida.
Vortex Spring is a cold freshwater spring that produces approximately 28 million US gallons (110,000 m3) of water daily. The spring consists of a 200 ft (61 m) basin with sloping sides and a cave which links the spring to the Floridan aquifer. Water temperature is steady at 68 °F (20 °C) with no thermocline, and is typically very clear. The spring runoff flows into nearby Otter Creek, which joins Sandy Creek a short distance upstream of Ponce de Leon Spring. There are many fish in the spring; large carp swim in the basin while freshwater eels live in the cave. The cave has been measured to a total of 1,642 feet (500 m).
Vortex Spring is a popular diving area both for experienced and novice divers. Recreational diver training is offered at the park. There are two underwater training platforms at 20 feet (6.1 m) which are often used for Open Water certification dives, and an inverted metal "talk box" that traps air, allowing divers to remove their regulators and talk to each other while under the surface.[1] The cavern entrance is at 58 feet (18 m) below the surface, and has an opening of 9 by 12 feet (2.7 m × 3.7 m). A handrail is mounted along the wall of the cave. The cave is accessible to 310 feet (94 m), further passage is blocked by a steel grate. Experienced divers are allowed to dive to 115 feet (35 m).
At the site, many facilities are provided for visitors. Lodging, dive shop, and changing rooms with heated showers are on site. Recreational features include diving boards, rope swings, and slides into the swimming area. Camping facilities, picnic areas, a basketball court, volleyball court, paddle boats, floats, and canoes are also provided.
During the early 1990s, 13 divers died while exploring the cave. The state of Florida threatened to ban diving near cave entrances as a result of frequent cave diving accidents, but local divers responded by developing a special cave diving certification that became the standard requirement for sections of underwater caves known to be particularly hazardous. Vortex Spring complied with this by erecting a locked underwater gate at the entrance to the dangerous section of the cave. Only those who have valid cave diving certificates are permitted to enter, requiring a staff member to unlock the gate, and typically accompany them during the dive.[2]
![A white warning sign with a picture of the [Grim Reaper] and the headline "Prevent your death. Go no farther" over black text explaining the dangers to divers of proceeding into the cave without proper equipment and certification](viewer.php?source=wikipedia&q=File%3AVortex%20Spring%20cave%20warning%20sign.jpg&result=0#selected-result)
In 2010, Ben McDaniel, a diver who was not certified for cave diving, but had been witnessed by staff and other divers gaining access to the restricted area of the cave by forcing open the gate, did not resurface after an employee let him through the gate one evening. It was initially assumed that he had died accidentally after becoming trapped underwater, but extensive searches did not find his body, nor any sign that one was present in the remote recesses of the cave.[2][3]
In 2012, another diver, Larry Higginbotham, died in the cave,[4] believed by those who recovered him to have been searching for McDaniel's body, motivated by a large reward offered by McDaniel's parents, which they rescinded after news of the event.[5]
Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
Vortex Spring is a commercially operated recreation, camping and dive park located near Ponce de Leon, Florida. It is the largest diving facility in the state of Florida.
On August 20, 2010, 30-year-old Ben McDaniel, of Memphis, Tennessee, United States, was reported missing after employees in the dive shop at Vortex Spring, north of Ponce de Leon, Florida, noticed that his pickup truck had remained in the shop's parking lot for the previous two days. McDaniel, who had been diving regularly at the spring while living in his parents' nearby beach house, had last been seen by two of those employees on the evening of August 18, on a dive entering a cave 58 feet (18 m) below the water's surface. While he was initially believed to have drowned on that dive, and his parents still strongly believe his body is in an inaccessible reach of the extensive cave system, no trace of him has ever been found. The state of Florida issued his family a death certificate in 2013. McDaniel had been living at his parents' beach house on the Emerald Coast during a sabbatical in the wake of a divorce, a business failure, and the death of his younger brother two years earlier. An avid diver since his teens, he had been a regular at the spring, where he had apparently been covertly exploring the cave despite lacking the required certification. Lengthy searches have only located some anomalously placed and filled decompression tanks; many of the divers who took part in those searches believe that if McDaniel is indeed dead, his body is not in the cave as he was too large to enter its narrower passages. The McDaniels devoted their family's extensive financial resources to the search, at one point guaranteeing the replacement cost of a remotely operated underwater vehicle (ROV). A reward they offered was rescinded in 2012 after the death of another diver who may have been trying to collect it, vindicating the criticism of the divers who had warned of that possibility and resented the McDaniels' insinuation that those who had searched for their son at great personal risk had not been "brave" enough. Although the McDaniels continue to believe that his body is in an area of the cave beyond the reach of current search capabilities, they have also entertained the possibility that his death was not an accident but the result of foul play. A private investigator they hired believes that his body may have been removed before any authorities were contacted, or that he may even have been murdered on land and the narrative of his disappearance fabricated as a cover story. A segment of Investigation Discovery's Disappeared was devoted to the case, as well as Ben's Vortex, a documentary co-directed by diver Jill Heinerth. In addition to the accident and murder theories, the documentary also considers the possibility that McDaniel staged the disappearance to escape a troubled recent past that included a divorce and financial setbacks. The McDaniels have vehemently rejected that theory, pointing to the dog and girlfriend he left behind as well as doubting that he would have knowingly subjected them to that level of grief after seeing how his brother's death had affected them.
A polar vortex, more formally a circumpolar vortex, is a large region of cold, rotating air; polar vortices encircle both of Earth's polar regions. Polar vortices also exist on other rotating, low-obliquity planetary bodies. The term polar vortex can be used to describe two distinct phenomena; the stratospheric polar vortex, and the tropospheric polar vortex. The stratospheric and tropospheric polar vortices both rotate in the direction of the Earth's spin, but they are distinct phenomena that have different sizes, structures, seasonal cycles, and impacts on weather. The stratospheric polar vortex is an area of high-speed, cyclonically rotating winds around 15 to 50 kilometres (10 to 30 mi) high, poleward of 50°, and is strongest in winter. It forms during autumn when Arctic or Antarctic temperatures cool rapidly as the polar night begins. The increased temperature difference between the pole and the tropics causes strong winds, and the Coriolis effect causes the vortex to spin up. The stratospheric polar vortex breaks down during spring as the polar night ends. A sudden stratospheric warming (SSW) is an event that occurs when the stratospheric vortex breaks down during winter, and can have significant impacts on surface weather. The tropospheric polar vortex is often defined as the area poleward of the tropospheric jet stream. The equatorward edge is around 40° to 50°, and it extends from the surface up to around 10 to 15 km (6 to 9 mi). Its yearly cycle differs from the stratospheric vortex because the tropospheric vortex exists all year, but is similar to the stratospheric vortex since it is also strongest in winter when the polar regions are coldest. The tropospheric polar vortex was first described as early as 1853. The stratospheric vortex's SSWs were discovered in 1952 with radiosonde observations at altitudes higher than 20 km (12 mi). The tropospheric polar vortex was mentioned frequently in the news and weather media in the cold North American winter of 2013–2014, popularizing the term as an explanation of very cold temperatures. The tropospheric vortex increased in public visibility in 2021 as a result of extreme frigid temperatures in the central United States, with newspapers linking its effects to climate change. Ozone depletion occurs most heavily within the polar vortices – particularly over the Southern Hemisphere – reaching a maximum depletion in the spring.
In fluid dynamics, a vortex (pl.: vortices or vortexes) is a region in a fluid in which the flow revolves around an axis line, which may be straight or curved. Vortices form in stirred fluids and may be observed in smoke rings, whirlpools in the wake of a boat, and in the winds surrounding a tropical cyclone, tornado, or dust devil. Vortices are a major component of turbulent flow. The distribution of velocity, vorticity (the curl of the flow velocity), as well as the concept of circulation are used to characterize vortices. In most vortices, the fluid flow velocity is greatest next to its axis and decreases in inverse proportion to the distance from the axis. In the absence of external forces, viscous friction within the fluid tends to organize the flow into a collection of irrotational vortices, possibly superimposed to larger-scale flows, including larger-scale vortices. Once formed vortices can move, stretch, twist, and interact in complex ways. A moving vortex carries some angular and linear momentum, energy, and mass, with it.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Mae Jemison, aboard Space Shuttle Endeavour in 1992.
