It's typically found at the same latitude as the U.S.-Canadian border. When we talk about "the jet stream," we're generally talking about the stronger polar jet stream, because most of our weather is driven by it. There are usually two jet streams in each hemisphere, the polar jet and the subtropical jet. Planes even use it to cut down on fuel consumption and travel times. These speedy winds drive or influence just about every weather system that we have the pleasure-or misfortune-of experiencing. It's easy to forget that there are vast rivers of wind whooshing just a few miles above our heads at speeds that could put most hurricanes and tornadoes to shame, but jet streams affect us every day without our realizing it. Unfortunately, that's not in the forecast.Ī jet stream is a swift current of air that encircles the globe right around the cruising altitude of a commercial airplane. As the Washington Post notes, if the jet stream were to dip far enough south, it could push Harvey out. Trapped between two big high-pressure systems, Hurricane Harvey has stalled over Houston, to devastating effect.
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