Short answers, pulled from the story.
Uranus has an exceptionally low internal heat flux, measured at only 0.042 plus or minus 0.047 W/m2, lower even than Earth's internal heat flux of about 0.075 W/m2. This lack of internal energy limits atmospheric activity. When Voyager 2 flew by in 1986, it observed only ten cloud features across the entire planet.
The Uranus Dark Spot (UDS) is a dark atmospheric feature first detected in 2006 by the Hubble Space Telescope and Keck Telescope. It was located at approximately 28 degrees north latitude, measured about 1300 km in latitude and 2700 km in longitude, and traveled at an average speed of 43.1 m/s in the prograde direction.
Uranus's upper troposphere shows retrograde winds of -100 to -50 m/s near the equator, shifting to prograde winds that peak near plus or minus 60 degrees of latitude. In the northern hemisphere, maximum speeds as high as 240 m/s have been measured near +50 degrees of latitude. In 2004, a burst of activity produced record wind speeds of 824 km/h.
The southern collar is a narrow bright band on Uranus straddling latitudes from -45 to -50 degrees, identified as the brightest large feature on the planet's visible surface. It is believed to be a dense concentration of methane clouds within a pressure range of 1.3 to 2 bar. Voyager 2 first documented it in 1986.
The lowest temperature recorded in Uranus's tropopause is 49 K (-224 degrees Celsius), making it colder than even the more distant Neptune. Scientists believe this is linked to Uranus's unusually low internal heat output; it barely radiates more energy than it receives from the Sun, unlike Neptune, which radiates 2.61 times what it receives.
Uranus's extreme axial tilt means its poles spend long periods pointed directly at or directly away from the Sun, creating intense seasonal extremes over its 84-Earth-year orbit. Photometry since the 1950s shows Uranus brightens at solstices and dims at equinoxes. Near equinox in 2007, the bright southern collar faded and a faint northern collar appeared at about 45 degrees latitude.