Life-threatening cold temperatures in the central US are caused by changes in wind circulation in the Arctic that bring cold air south. Climate change could make these events more frequent.
At a very simple level, "weather" refers to day-to-day conditions. "Climate" describes the average over many years.
Twice every day the Bureau of Meteorology sends out the official weather forecasts for towns and cities across Australia. Here's how we work out what to say in them.
Dust storms look spectacular but are a serious health hazard. As climate change dries up many areas of the world, what can we expect from these storms in future?
Haze from Northern California wildfires has drifted as far east as Philadelphia. Wildfire smoke contains many potentially toxic substances, so anyone exposed to it should take basic precautions.
The future climate that scientists predict for the middle of the United States is one that will foster more hail events with bigger hailstones.
Don't believe the skeptics or the conspiracy theorists: Weather forecasters can't slant hurricane warnings to make political points.
How do experts know when and where the next big hurricane is going to hit? A look at the complicated science of forecasting.
Technology can only go so far in making sense of our vast and intricate atmosphere.
And how long before such extreme heatwaves become the 'new norm' across the region?
Yesterday's weather helps make sense of today's, but how will this change as the climate changes?
When you see a bolt of lightning, do you immediately start counting to see how far off a storm is? An atmospheric scientist parses the practice.
Why can't meteorologists call the weather correctly every time? Blame the battle of the weather models.
The skies can tell us when there might be trouble ahead.
Governments and private companies have been seeding clouds to create snow for decades, without proof that it actually works. A recent study peered into clouds in search of answers.
Wind is just air moving from one place where there is high pressure to another place where there is low pressure.
But it's too early to tell whether climate change is to blame.
To answer this question from Fiona, age 6, we need to know some things about clouds and light.
At the time, their existence was unknown.
European tornadoes may not come along as often as their US counterparts but they are a real threat and need to be taken seriously.