Vitrectomy Surgery. updated. Sometimes, a vitreous hemorrhage can clear up on its own. If vision does not improve, vitrectomy surgery may be necessary. A vitrectomy is a surgical procedure that is performed to remove the clouded vitreous gel in the center of the eye.
Hail is generally associated with spring thunderstorms but may occur at any time of year. Hail is formed in huge thunderhead (cumulonimbus) clouds (Munez, 2000). During days when the soil is heated by the sun, the air near the ground also is heated.
Unlike hurricanes, tornadoes do not have a set start and end date during which they occur. If the conditions are right for a tornado, they can occur anytime throughout the year. Of course, there are certain times of year when they're more likely to occur, depending on where you live. Why is spring considered to be peak tornado season?