Atmospheric Science

Precipitation can vary from rain to snow when the temperature is below freezing. Why does precipitation not always fall as snow when it's below freezing?

We can usually see rainbows right after a rainstorm on a warm Spring day. These giant colorful arcs stand out against the dark rain clouds. Have you ever wondered what causes this phenomena? Find out how rainbows are created in this article from HowStuffWorks.

By Austin Henderson

There's often a strong, quite pleasant, smell right after a rain shower. What accounts for petrichor, the 'smell of rain'?

By Kathryn Whitbourne & Desiree Bowie

How does the aurora borealis (the Northern Lights) work? What causes it? Why can you only see it in the North? Are the myths about it producing sound true?

By Austin Henderson

We hear about humidity in just about every weather report on the nightly news. There are several different ways meteorologists measure humidity, but relative humidity is the most common measurement. What is relative humidity, though?

By Nathan Chandler

Acid rain is caused by emissions of sulfur dioxide and nitrogen oxides from power plants, cars and factories. Find out how acid rain is produced, how it affects natural and man-made objects and how governments aim to reduce it.

By Sarah Dowdey

A perfect climate means different things to different people. These 10 countries span the globe and offer a wide range of climates to satisfy any taste -- hot, cold or in-between.

By Jennifer Horton

Your grandfather may swear that he can feel the onset of a harsh winter in his bones - and your family may swear it's true - but a lot of us would prefer a more scientific method for predicting what the winter may have in store for us.

By Kate Kershner

You've probably heard that no two snowflakes are alike, but how can that be true? Find out how molecules of water vapor come together to form these winter wonders.

By Nathan Chandler

Ever hear that saying that a cow lies down when rain is coming? This superstition may not be as udderly ridiculous as you think.

By Nicholas Gerbis

If the legend is true, at the end of every rainbow is a pot of gold. Does that mean if triple rainbows exist, you'll find three pots of gold?

By Kate Kershner

One of the best things about autumn is watching the leaves change color to fiery hues of red, gold and orange. Some say a rainy summer leads to an extra-vivid leaf show. Is that true?

By Kate Kershner

A double rainbow, man! Just the sight of one can send us babbling into happiness. And why not? Rainbows are beautiful. And two rainbows at the same time? Even better. But just how rare are these colorful arcs?

By Kate Kershner

We humans have figured out a lot of strange ways to measure the weather. A cricket's chirps can tell us the temperature. The open scales on a pinecone signal a dry spell. But can a ring around the moon really predict rainy days ahead?

By Kate Kershner

It sure would be handy to know what the weather is going to be like for the next year. Unfortunately, there's just one problem: Weather is notoriously difficult to predict. So is the Farmers' Almanac accurate, or is it just blowing hot air?

By Kate Kershner

If humid air is just air plus water, then it has to be heavier than dry air, right? Sure, if it was only a matter of simple addition, but molecular physics is a lot like a bouncer at a club: Nothing gets in unless something else goes out.

By Kate Kershner

Iceland? The North Pole? Antarctica? There are a lot of super cold places on this planet, but which one can claim bragging rights as the coldest place on Earth?

By Mark Mancini

These annual winds blow during Southern California's dangerous dry season, whipping up wildfires that can ravage thousands of acres.

By John Donovan

It might seem that the constant rushing of water over a falls would keep it from freezing, but that isn't always the case. Check out the science behind the phenomenon of the frozen waterfall.

By Mark Mancini

Dusk is a beautiful time of day. So is twilight. But when does one turn into the other? And did you know there were three versions of each?

By Valerie Stimac

In 2014, scientists observed a space hurricane for the first time; they reported their findings this year. But what's a space hurricane - and do we on Earth have to worry about with them?

By Valerie Stimac

The four seasons experienced by Earth's midlatitude regions are being gradually altered by global warming - but a climate expert says they won't completely go away.

By Patrick J. Kiger & Desiree Bowie

Not to be confused with sleet, graupel is actually an interesting mix of snow and ice. But it's not hail. Graupel, get to know it.

By Laurie L. Dove

California has experienced unprecedented rain lately, but the state is still in a drought. So why can't the rain falling now be saved for later?

By Andrew Fisher

Bluebirds symbolize optimism, happiness and hope for the future. For skiers, a "bluebird day" bodes well for a great day on the slopes, but hunters and anglers may as well stay home.

By Thomas Harlander