We hear about troughs and ridges all the time in our daily forecasts. These features high in the atmosphere are responsible for the vast majority of the weather we experience down here on the ground.

When you look at the atmosphere over a long period of time, it appears to move like a fluid. And just like a fluid, the atmosphere often moves in waves. In meteorology, we call the low points in ...

If you’ve watched a weather forecast, you’ve probably heard terms like ridge, trough, or even southwest flow. They might sound technical, but they’re actually ...

The progression (or lack thereof) of these throughout the year is the baseline for what we call the “weather pattern.” Ridges refer to northward arcs in the jet stream — the fast-moving river of air 6 ...

You’ll hear it fairly often in forecasts, any may have heard it right before it rained: an “upper-level trough” is on the way. The news may be accompanied by colorful charts. It may not be apparent ...

Add Yahoo as a preferred source to see more of our stories on Google. An isolated area of Maine could see up to a foot of snow due to a Norlun Trough. Maine's Total Weather meteorologist Colleen ...