Squall
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A squall is a sudden, sharp increase in wind speed lasting minutes, as opposed to a wind gust, which lasts for only seconds. They are usually associated with active weather, such as rain showers, thun
A shelf cloud such as this one can be a sign that a squall is imminent
A summer squall line in Southern Ontario, producing lightning and distant heavy rains.
Tropical cyclone
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A tropical cyclone is a rapidly rotating storm system with a low-pressure area, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy r
Squall
…thunderstorm's gust front. From the time these low cloud features appear in the sky, one can expect a sudden increase in the wind in less than 15 minutes. Tropical cyclones normally have squalls coincident with spiral bands of greater curvature than many mid-latitude systems due to their smaller size. These squalls can…
Hurricane Florence viewed from the International Space Station in 2018. The eye, eyewall, and surrounding rainbands are characteristics of tropical cyclones.
Hurricane Paulette, in 2020, is an example of a sheared tropical cyclone, with deep convection slightly removed from the center of the system.
Three tropical cyclones of the 2006 Pacific typhoon season at different stages of development. The weakest (left) demonstrates only the most basic circular shape. A stronger storm (top right) demonstrates spiral banding and increased centralization, while the strongest (lower right) has developed an eye.
The eye and surrounding clouds of Hurricane Florence seen from the International Space Station