<P> The original, November 1961, AEC estimate of the yield was 55--60 megatons, but since 1992, all Russian sources have stated its yield as 51 megatons . First secretary Khrushchev warned in a filmed speech to the Supreme Soviet of the existence of a 100 megaton bomb . (Technically the design was capable of this yield .) </P> <P> Although simplistic fireball calculations predicted the fireball would hit the ground, the bomb's own shock wave reflected back and prevented this . The fireball reached nearly as high as the altitude of the release plane and was visible at almost 1,000 km (620 mi) away from where it ascended . The mushroom cloud was about 64 km (40 mi) high (over seven times the height of Mount Everest), which meant that the cloud was above the stratosphere and well inside the mesosphere when it peaked . The cap of the mushroom cloud had a peak width of 95 km (59 mi) and its base was 40 km (25 mi) wide . </P> <P> All buildings in the village of Severny (both wooden and brick), located 55 km (34 mi) from ground zero within the Sukhoy Nos test range, were destroyed . In districts hundreds of kilometers from ground zero wooden houses were destroyed, stone ones lost their roofs, windows, doors, and radio communications were interrupted for almost one hour . One participant in the test saw a bright flash through dark goggles and felt the effects of a thermal pulse even at a distance of 270 kilometres (170 mi). The heat from the explosion could have caused third - degree burns 100 km (62 mi) away from ground zero . A shock wave was observed in the air at Dikson settlement 700 km (430 mi) away; windowpanes were partially broken to distances of 900 kilometres (560 mi). Atmospheric focusing caused blast damage at even greater distances, breaking windows in Norway and Finland . Despite being detonated 4.2 km above ground, its seismic body wave magnitude was estimated at 5--5.25 . Sensors continued to identify the shockwaves after their third trip around the world . </P> <P> Immediately after the test, several U.S. Senators condemned the Soviet Union . Prime Minister of Sweden Tage Erlander saw the blast as the Soviets' answer to a personal appeal to halt nuclear testing that he had sent the Soviet leader in the week prior to the blast . The British Foreign Office, Prime Minister of Norway Einar Gerhardsen, Prime Minister of Denmark Viggo Kampmann, and others also released statements condemning the blast . Russian and Chinese radio stations mentioned the American underground nuclear test of a much smaller bomb carried out the day prior without mentioning the Tsar Bomba test . </P>

What is the range of the tsar bomba
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