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Thunderstorm Frequency Map Before lightning detection networks, thunderstorms were tabulated by keeping track of thunder heard at weather observation stations.Still image:
Size: 3158 x 2369
Acquisition: Graphic, Scanned illustration
Frame rate: still
Clearance: No releases required
Location: Graphic
License: Royalty Free
Usage: Creative and Editorial
Point of view: Other
Geography: N/A
Ambiance: N/A
Time shot: N/A

Season shot: N/A

Still images available: Y
Keywords:   Thunder (audio), Weather Explanations, Thunderstorm, Lightning
Asset ID: 5343
Title: Thunderstorm Frequency Map
Concept: Before lightning detection networks, thunderstorms were tabulated by keeping track of thunder heard at weather observation stations.
Detail: Thunderstorms can occur anywhere in the United States on any given day, but they are most frequent throughout the Southern States, Florida and the Front Range of the Rocky Mountains. During the summer, the Colorado and New Mexico Rockies almost daily generate "towering thunderheads, some of which drift off into the plains and travel east as squall lines and mesoscale convective complexes. The Florida Peninsula however is the leader due to sea breezes on both coasts which routinely trigger thunderstorms. Throughout the central and northern plains and the Great Lake States, annual averages between 30 and 50„thunderstorms days per year are common. Since thunderstorms are in part caused by rising warm air, they tend to be-most frequent during the heat of summer afternoons. Between noon and sunset approximately 70% form and go through their life cycle which may last several periods of ten minutes to several hours. The west coast has a negligible frequency of thunderstorms. Those that occur, tend to be imbedded within wintertime rain storms that lash the region from time to time. Stable marine air tends to inhibit thunderstorm formation during the summer along the west coast. The distribution of deaths from lightning across the United States is also strongly influenced by the area in which people live. The southern states, especially Florida, has a very high incident of lightning as well as a significant population frequenting the outdoors. These states generally tend to have the highest rate of deaths and injuries from lightning strikes.

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