Climate & Weather

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

Whether you're planning an outdoor wedding or a Saturday morning tag sale, it's nice to know ahead of time what the sky is going to do. But does checking the 10-day forecast do any more good than praying for sunshine?

By Robert Lamb

Ball lightning can float through the air, pass through walls and even kill you. What could it be, and why are scientists finally accepting this strange meteorological phenomenon?

By Maria Trimarchi & Austin Henderson

Many cultures have a flood myth -- an ancient story of a deluge that swallowed the Earth. So could a great flood really have happened, and how would we be able to tell?

By Maria Trimarchi

It may seem like a perfectly reckless display of aeronautical wiles, but guiding an airplane into a swirling beast of a hurricane gleans data that can save lives. The only question is, who were the crazy mavericks who attempted it first?

By Josh Clark

Being struck by lightning is a little more complicated than a sudden collision with a flash of light from the sky, and not all strikes are equally lethal.

By Katherine Neer

A heavy rain in which frogs come plummeting down isn't a pretty sight, but it happens more often than you'd think. Why do animals sometimes fall from the sky?

By Julia Layton

Sometimes a lightning storm heralds sightings of St. Elmo's Fire. What causes the mysterious glow sailors interpreted as a sign of salvation?

By Julia Layton

They're an odd enough sight in the sky to make you do a double take. Ready for the "super cool" explanation behind hole-punch clouds?

By Allison Troutner

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

Hygrometers are used by many professionals to monitor levels of humidity in the air. So, do need one in your home?

By Cherise Threewitt

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

Understanding a tornado watch vs. warning is the difference between preparing for a potential disaster or immediately seeking shelter.

By Yara Simón

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

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

Bombogenesis is a phenomenon in which the atmospheric pressure in the middle of a low-pressure system drops rapidly, intensifying a storm and creating a bomb cyclone.

By Jesslyn Shields

Weather forecasters can tell what the weather will be by reading the barometric pressure, but how does it work?

By Dylan Ris

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

Where is tornado alley and why do so many tornadoes form there?

By Patrick J. Kiger

A geomagnetic storm could cause a spectacular aurora borealis Aug. 18 and 19 over parts of the continental United States, as far south as Illinois.

By Sarah Gleim

Haboobs are giant walls of dust that can come seemingly out of nowhere. How are they created and are they different from sandstorms?

By Jennifer Walker-Journey

Mammatus clouds, which are made from falling air instead of rising air, are one of the most spectacular cloud formations you'll ever see.

By Jesslyn Shields

Frogs! Fish! Birds! A surprising number of things have rained down from the sky besides water. But how?

By Melanie Radzicki McManus