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Temperature differences can cause air currents because warmer air is less dense than cooler air, causing the warmer air to appear "lighter." Thus, if the warm air is under the cool air, air currents will form as they exchange places. Air currents are caused because of the uneven heating of Earth's surface. [5] [6]
Etesian (Greek name) or Meltem (Turkish name) (northerly across Greece and Turkey) Euro (a warm and usually moderate wind from Africa that reaches the Ionian coast of Italy) Euroclydon (a cyclonic tempestuous northeast wind in the Mediterranean) Föhn or foehn (a warm, dry, southerly wind off the northern side of the Alps and North Italy.
The rising air creates a low pressure zone near the equator. As the air moves poleward, it cools, becomes denser, and descends at about the 30th parallel, creating a high-pressure area. The descended air then travels toward the equator along the surface, replacing the air that rose from the equatorial zone, closing the loop of the Hadley cell. [3]
A valley exit jet is a strong, down-valley, elevated air current that emerges above the intersection of the valley and its adjacent plain. These winds frequently reach speeds of up to 20 m/s (72 km/h; 45 mph) at heights of 40–200 m (130–660 ft) above the ground.
The following is a list of meteorology institutions around the world. This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources .
The list always contains 21 names because the letters Q, U, X, Y and Z are not used for naming. There is a total of six lists that get rotated throughout the years. So, the list for this year ...
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Porter pointed out that if the balloon was flying at an altitude greater than 70,000 feet, it could have taken a track to the west from Montana instead of traversing the central and eastern United ...