As you can see in the image above, the jet stream is stronger during those colder months, which means storm systems can move faster as they travel from west to east. There is also a greater variation in temperatures across the country. The average wind speed of the jet stream slows down because of a decreased temperature contrast between the Earth's higher and middle latitudes. One reason is that frontal systems, which help form rain and thunderstorms, move slower or even stall because the jet stream has lost its ability to shove them away.
That also allows for building heat and humidity to form south of the jet stream. When that happens, we can see hot domes of high pressure build, resulting in multiday heat waves. The high humidity is also why the South often sees isolated to scattered "pop-up" afternoon thunderstorms daily. Old Glory Giveaway. Beat Bama Blood Drive. Showcasing Louisiana. Player of the Week. Submit Nomination for Player of the Week. Latest Newscasts. Investigate TV. Election Results.
Gray DC Bureau. Louisiana Weekend. Great Health Divide. Movement of Weather Systems. Published: Apr. Share on Facebook. Email This Link. These massive volumes of air often cover thousands of miles and reach to the stratosphere. Overtime, mid-latitude cyclonic storms and global wind patterns move them to locations far from their source regions. What happens when 2 air masses meet? The cold air pushes the hot air upwards, when going up the temperature drops and the air can't hold as much water when it is warm, so the cold water molecules condense and form clouds.
Jet Stream A jet stream is the name given to the area of air above where two air masses of different temperature converge e.
The greater the temperature difference between the air masses, the greater the air pressure difference, and the faster the wind blows in the jet stream. This river of air has wind speeds which often exceed mph, and sometimes over mph.
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