Severe Thunderstorms: How hail forms
Over the weekend, we had a taste of strong, spring-like storms where South Florida experienced severe thunderstorms that produced hail.
A severe thunderstorm by definition is a thunderstorm that produces one-inch hail or larger in diameter and/or winds equal to or greater than 58 mph.
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Hail can range in all different sizes – from a ping pong ball to as large as a softball. In South Florida, whenever we do get storms that produce hail, they usually range from a pea-sized to a quarter but can still cause significant damage. Within strong thunderstorms, there's a strong updraft and downdraft.
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Raindrops get sucked into the updraft and are carried into very cold parts of the atmosphere, where they freeze into small hailstones. The hail is carried up and down within the storm cloud, where they can grow by colliding with supercooled water droplets. As a result, hailstones will fall when they’re heavy enough, or when the updraft weakens.
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Severe thunderstorms can also produce tornadoes. Our next impact weather day this week is Wednesday – when there is the potential for isolated severe thunderstorms.
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