Category Archives: Phenomena
Lightning is an atmospheric discharge of electricity that is five times hotter than the surface of the sun. When lightning strikes the ground, it is hot enough to fuse silica sand and clay together into fulgurites: shafts of glass produced … Continue reading
The “urban heat island effect” refers to the increased temperatures of urban areas compared with their rural surroundings. The urban heat island is a well-documented example of inadvertent modification of climate by human activities. It is a classic example of … Continue reading
When we see a flash of lightning, it looks as though it forms all at once.
However, a lightning bolt is actually produced in many steps. The bolt occurs so quickly that it looks like a single brilliant flash, but high-speed photography can reveal several distinct bolts. Continue reading
There have been large forest fires in northern Alberta, Canada, and the smoke has drifted over the Midwest, including Wisconsin.
Smoke can cause the sky to appear hazy, even if the smoke is high above the ground. The smoke scatters sunlight to make the sunlight diffuse and grayish. When the smoke is thick, it can cause brilliant red sunsets and sunrises, as it did on Thursday. When light beams interact with particles suspended in air, the light can be scattered or absorbed. Continue reading
Thunderstorms rolled through Madison between 8:30 and 9 a.m. Thursday May 16th. Stunning “flying-saucer” clouds accompanied the dark skies of the leading edge of the storm. These dark, protruding clouds are “shelf clouds.” The clouds look like a shelf and … Continue reading