Severe Weather: What is the Cap, and a Microburst?

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The cap is warm aloft which depresses or delays thunderstorm development.
As the day heats up, warm updrafts begin forming. As long as the temperatures keeps falling higher in the atmosphere, air will continue rising.
If the updraft hits a layer of warmer air it can no longer continue rising to form larger clouds or storms.
The cap, that warm aloft keeps storms at bay on a hot day.
However, if there’s enough heating or if there’s an area where the cap is thin or weak, the cap can be broken, allowing stronger storms to develop.
When this “lid” or cap holds, no problems. When it breaks, severe weather can happen
As thunderstorms increase with warming temperatures, we occasionally will see microbursts.
Dry air pulled into a storm leads to evaporative cooling of the air.
The cool air falls, rapidly accelerating downward.
When it hits ground it’s forced outward in all directions. Winds up to 150 miles-an-hour can spread out up to 2-miles.
Dangerous if you’re close, a definite threat to airplanes and destructive to things like farm fields.
Microbursts are often confused with tornadoes.

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