occasion where a Senate election is held without an accompanying House Of Representatives election. May 11 – Waco tornado outbreak: An F5 tornado hits in the downtown section of Waco, Texas, killing 114. May 15 – The Standards And Recommended Practices (SARPS) for Aeronautical Information Service (AIS) are adopted by the ICAO Council. These SARPS are in Annex 15 to the Chicago Convention, and 15 May is celebrated by the AIS community as "World AIS Day". May 18 – At Rogers Dry Lake, Californian Jackie Cochran becomes the first woman to exceed Mach 1, in a North American F-86 Sabre at . May 25 – Nuclear testing: At the Nevada Test Site, the United States conducts its only nuclear artillery test: Upshot-Knothole Grable. May 29 – 1953 British Mount Everest expedition: Sir Edmund Hillary from New Zealand and Tenzing Norgay from Nepal become the first men to reach the summit of Mount Everest. June June 1 – Uprising in Plzeň: Currency reform causes riots in Czechoslovakia. June 2 – Elizabeth II is crowned Queen of the United Kingdom and the other Commonwealth realms, at Westminster Abbey. June 7 – Italian general election: the Christian Democracy party wins a plurality in both legislative houses. June 7-9 – Flint–Worcester tornado outbreak sequence: A single storm-system spawns 46 tornadoes of various sizes, in 10 states from Colorado to Massachusetts, over 3 days, killing 246. June 8 On the second day of the Flint–Worcester tornado outbreak sequence, a tornado kills 116 in Flint, Michigan; it will be the last to claim more than 100 lives, until the 2011 Joplin tornado. Austria and the Soviet Union open diplomatic relations. June 9 On the third day of the Flint–Worcester tornado outbreak sequence, a tornado spawned from the same storm system as the Flint tornado the day before hits in Worcester, Massachusetts, killing 94. CIA Technical Services Staff head Sidney Gottlieb approves of the use of LSD in an MKUltra subproject. June 13 – Hungarian Prime Minister Mátyás Rákosi is replaced by Imre Nagy. June 17 – Workers' Uprising in East Germany: The Soviet Union orders a Division of troops into East Berlin to quell a rebellion. June 18 Egypt declares itself a republic. Tachikawa air disaster: A United States Air Force Douglas C-124 Globemaster II crashes just after takeoff from Tachikawa Airfield near Tokyo, Japan, killing all 129 people on board in the worst air crash