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Category Archives: Phenomena
Were those the Northern Lights last Tuesday?
Yes! If you were out late on Tuesday night, you might have seen the Northern Lights. The Northern Lights, also called aurora borealis, appear as a diffuse glow or as overlapping curtains of greenish-white and sometimes red light in the night sky. Continue reading
What is heat lightning?
In heat lightning you see the flash of light from the lightning, but you don’t hear the thunder the lightning produces. All lightning produces thunder when the bolt heats the air around it. This rapid heating causes the air to … Continue reading
What were those lumpy-looking clouds over Madison last Tuesday
Those types of cloud are called mammatus. They often extend from the bottom of the anvil cloud of a thunderstorm, also called a cumulonimbus cloud, and indicate an intense storm is nearby. This was the case on Tuesday. Mammatus clouds … Continue reading
What is clear air turbulence?
Clear-air turbulence, abbreviated “CAT,” occurs high in the atmosphere at the cruising altitude of passenger jets. CAT happens in clear sky conditions and where the wind direction and speed changes quickly with height. If you flew on a plane that experiences a jarring bumpiness and yet there are blue skies out the window, then you’ve experienced CAT. It is most common over mountains, near fronts and around the jet stream. It is also more common in winter than summer. Continue reading
Does sound travel better in fog?
No. Sound is a sequence of pressure waves that propagate through a compressible medium, such as air or water. Sound has to move molecules in order to travel. Sound is transmitted from a source to the surrounding molecules, which vibrate or collide and pass the sound energy along until it eventually reaches our ears. The closer the molecules are to each other, the farther the sound can travel. This is why sound travels farther through water than it does through air and why it is impossible for sound to move through space. Continue reading
