English: This chart from September 1949 shows the United States Weather Bureau's prediction for where the Soviet Union first tested its atomic bomb in 1949. Each colored zone indicates the probability that the bomb was detonated within that area. This is one of several maps, each one showing slightly different probabilities depending on the exact date the bomb was assumed to have gone off (this one uses the date now known to be correct). The analysis was done by extrapolating backwards from assumed wind patterns.
Date
Source
US National Archives website: Harry S. Truman Presidential Library, Collection HST-PSF: President's Secretary's Files (Truman Administration), Series: Subject Files, File Unit: National Security Council - Atomic File, 1945-1952: Atomic Bomb: Reports: "Report, United States Weather Bureau Report on Alert Number 112 of the Atomic Detection System."
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This chart from September 1949 shows the United States Weather Bureau's prediction for where the Soviet Union first tested its atomic bomb in 1949. Each colored zone indicates the probability that the bomb was detonated within that area.
Uploaded a work by United States Weather Bureau from [https://catalog.archives.gov/id/310987319?objectPage=7 US National Archives website]: Harry S. Truman Presidential Library, Collection HST-PSF: President's Secretary's Files (Truman Administration), Series: Subject Files, File Unit: National Security Council - Atomic File, 1945-1952: Atomic Bomb: Reports: "Report, United States Weather Bureau Report on Alert Number 112 of the Atomic Detection System." with UploadWizard
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