What are the northern lights? Aurora Borealis over Iceland, by Moyan Brenn The northern lights, also called aurora borealis, are an
Will the 2010 volcanic eruption in Iceland lead to a change in global weather patterns? 2010 eruption of Eyjafjallajökull by Sverrir
What is the cause of strong winds? Photo: wwwuppertal The wind is simply air in motion, flowing from high atmospheric pressures to low
Those are mammatus clouds, which are often, though not always, associated with thunderstorms. Mammatus often extend from the bottom of More
Where does the dew on blades of grass come from? As fall begins, we have lots of mornings with dew on the grass. To explain this, we
The probability of precipitation (fondly known as PoP) has been part of weather forecasts since the late 1960s, and is the only forecas More
What are those beams of light that emerge from clouds?
What are the different types of thunderstorms? A supercell thunderstorm over Chaparral, N.M., photographed by Greg Lundeen for NOAA
When is the severe weather season?
What are growing degree days? The Growing Degree Day, or GDD, is a heat index that can be used to predict when a crop will reach
Do tides and seiches occur on lakes? NOAA Tides are changes in water level caused by the gravitational pull on water by the moon and,
Sun pillar Sun pillar at sunrise by CaptPiper The other morning, I saw a column of light above the rising sun — what was that? A
How can we determine how far away lightning is? Make your own lightning Because of the vast differences in the speed of light and the
When does the overnight low temperature occur on a windless day? Frosty sunrise by Marilylle Soveran As summer begins to fade, the