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Thunder is the sound caused by lightning. [ 1 ] [ 2 ] [ 3 ] Depending upon the distance from and nature of the lightning, it can range from a long, low rumble to a sudden, loud crack. The sudden increase in temperature and hence pressure caused by the lightning produces rapid expansion of the air in the path of a lightning bolt . [ 4 ]
From 1960s to 1980s, a worldwide effort was made to measure the atmospheric noise and variations. Results have been documented in CCIR Report 322. [1] [7] CCIR 322 provided seasonal world maps showing the expected values of the atmospheric noise figure F a at 1 MHz during four hour blocks of the day.
A severe thunderstorm warning is issued if a thunderstorm becomes severe, or will soon turn severe. In Canada, a rainfall rate greater than 50 millimetres (2 in) in one hour, or 75 millimetres (3 in) in three hours, is also used to indicate severe thunderstorms. [38] Severe thunderstorms can occur from any type of storm cell.
The series consists of recordings of natural sounds such as a seashore with crashing waves or a thunderstorm with falling rain, without musical accompaniment. The series helped ignite a worldwide interest in field recordings which resulted in many imitations being released throughout the 1970s, 1980s and 1990s both with, and without, music.
Thundersnow, also known as a winter thunderstorm or a thundersnow storm, is a thunderstorm in which snow falls as the primary precipitation instead of rain. It is considered a rare phenomenon. [ 1 ] It typically falls in regions of strong upward motion within the cold sector of an extratropical cyclone .
A common definition is a thunderstorm complex that produces a damaging wind swath of at least 390–640 kilometres (240–400 mi), [12] [4] [13] featuring a concentrated area of convectively-induced wind gusts exceeding 25 m/s (50 kn). [2]
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(The classifiable criteria for a severe thunderstorm vary by country; e.g., in the United States, a thunderstorm is considered severe if it produces winds exceeding 58 mph [93 km/h] and/or hailstones larger than one inch [2.5 cm] in diameter.) [12] A tornado warning therefore implies that it is also a severe thunderstorm warning. Conversely, a ...
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