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Category Archives: Phenomena
Why does fog form over the lake?
The recent cold weather was accompanied by interesting fog over the open water of our lakes.
Fog is essentially a ground-hugging cloud, composed of tiny liquid water droplets. Continue reading
What is fulgurite?
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
Can large cities generate their own weather?
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
Is that photo of circular lightning?
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
Category: Meteorology, Phenomena, Severe Weather
Comments Off on Is that photo of circular lightning?
Comments Off on Is that photo of circular lightning?
Why was the sky hazy on Thursday and Friday?
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
