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The average is about 20,400 K (20,100 °C; 36,300 °F). [10] This heating causes a rapid outward expansion, impacting the surrounding cooler air at a speed faster than sound would otherwise travel. The resultant outward-moving pulse is a shock wave, [ 11 ] similar in principle to the shock wave formed by an explosion , or at the front of a ...
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.
A lightning channel with all its branches and its electric currents behaves like a huge antenna system from which electromagnetic waves of all frequencies are radiated. . Beyond a distance where luminosity is visible and thunder can be heard (typically about 10 km), these electromagnetic impulses are the only sources of direct information about thunderstorm activity on the gr
In Canada, a severe thunderstorm is defined as having wind gusts of greater than 90 km/h (56 mph), hail with a diameter of greater than two centimetres (0.79 in), rainfall rates of greater than 50 millimetres (2.0 in) in one hour or greater than 75 millimetres (3.0 in) in three hours, or tornadoes. [14]
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 .
Federal_Signal_RSH-10_Thunderbeam_video.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 9 min 44 s, 720 × 480 pixels, 360 kbps overall, file size: 25.05 MB) This is a file from the Wikimedia Commons .
These watches are issued for large areas by the Storm Prediction Center in Norman, Oklahoma, and are usually valid for five to eight hours. [3] [10] Particularly dangerous situation severe thunderstorm watch SVA – Conditions are favorable for the development of severe thunderstorms in and close to the watch area. Isolated tornadoes are ...
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