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Widely scattered thunderstorms. Lightning is infrequent, 6–10 cloud-to-ground strikes in a five-minute period. 4 Scattered thunderstorms. Lightning is frequent, 11–15 cloud-to-ground strikes in a 5-minute period. 5 Numerous thunderstorms. Lightning is frequent and intense, greater than 15 cloud-to-ground strikes in a five-minute period. 6
The result is the nearly daily development of clouds that produce thunderstorms. For example, "Lightning Alley"—an area from Tampa to Orlando—experiences an extremely high density of lightning strikes. As of 2007, there were as many as 50 strikes per square mile (about 20 per km 2) per year.
Thunderstorms which show radar returns above 14 kilometres (8.7 mi) in height are associated with storms which have more than ten lightning flashes per minute. There is also a correlation between the total lightning rate and the size of the thunderstorm, its updraft velocity, and amount of graupel over land.
All thunderstorms, regardless of type, go through three stages: the developing stage, the mature stage, and the dissipation stage. [13] [14] The average thunderstorm has a 24 km (15 mi) diameter. Depending on the conditions present in the atmosphere, each of these three stages take an average of 30 minutes. [15]
Severe weather has pummeled the Kansas City area in the last few weeks, and this weekend could bring even more storms.The National Weather Service explains why this spring’s weather has been ...
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IC flashes also are many times as frequent [4]: 192 as CG so provide a more robust signal. The relative high density (number per unit area) of IC flashes allows convective cells to be identified when mapping lightning whereas CG lightning are too few and far between to identify cells which typically are about 5 km in diameter.
The first week of September is usually one of the busiest times of the year for tropical storms and hurricanes, but there is an eerie silence across the Atlantic Ocean. AccuWeather adjusted its ...