Upper air winds are generally faster than surface winds
Because friction is substantially decreased in the upper atmosphere, upper-air winds are quicker than surface winds. Surface winds are slowed by friction, which lessens the Coriolis effect. As a result, air moves diagonally over the isobars in the direction of the region of lower pressure. Winds blow outward and clockwise around an anticyclone.
Winds in the upper levels will blow clockwise around areas of high pressure and counterclockwise around areas of low pressure. The speed of the wind is determined by the pressure gradient. The winds are strongest in regions where the isobars are close together.
Where temperature differences between air masses are highest, winds are strongest and frequently surpass 92 km/h (50 kn; 57 mph). There have been reports of speeds of 400 km/h (220 kn; 250 mph). Weather changes are brought on by the jet stream as it travels from west to east.
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