When high pressure from aloft—10,000-25,000ft remains strong over an area for several days to weeks, heat waves occur. This happens both in the Northern and Southern Hemispheres during the summer as the jet stream follows the path of the sun. On the equator side of the jet stream, high pressure builds up in the middle layers of the atmosphere.
Because summertime weather patterns tend to be slower than wintertime patterns, the mid-level pressure also moves very slowly. The air sinks towards the surface under high pressure and then acts as a cap holding in the hot air. Because the air cannot lift, cumulus clouds are less likely to form, making rain unlikely. The build up of heat on the surface then becomes a heat wave.
When high pressure from aloft—10,000-25,000ft remains strong over an area for several days to weeks, heat waves occur. This happens both in the Northern and Southern Hemispheres during the summer as the jet stream follows the path of the sun. On the equator side of the jet stream, high pressure builds up in the middle layers of the atmosphere.Because summertime weather patterns tend to be slower than wintertime patterns, the mid-level pressure also moves very slowly. The air sinks towards the surface under high pressure and then acts as a cap holding in the hot air. Because the air cannot lift, cumulus clouds are less likely to form, making rain unlikely. The build up of heat on the surface then becomes a heat wave.
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