Historical clue formulations

• "This is ___ of the emergency ..." — 2023-09-20
• Blast of the past, in brief — 2022-07-16
• "This is only ___" — 2021-09-22
• 1940s nuclear event, for short — 2021-04-19
• Nuclear trial, informally — 2020-04-21
• Big bang source, informally — 2019-05-04
• Arms race event, for short — 2017-12-23
• Unnerving boom, of sorts — 2017-10-14
• Arms race event, briefly — 2015-09-26
• Remotely monitored event, informally — 2014-10-24
• Historic event on Bikini atoll, briefly — 2014-06-10
• 1945 Alamogordo event, informally — 2014-03-17
• "This is only ___" — 2014-03-04
• Bikini blast, informally — 2014-02-09
• "This is only ___" — 2013-08-14
• Big blast, informally — 2012-06-10
• Mushroom maker, briefly — 2011-10-13
• Mushroom grower, for short? — 2011-03-05
• Bikini blast, briefly — 2010-01-10
• Secret event of '45 — 2009-10-25
• Event that could be seen as far away as Las Vegas in the '50s — 2009-07-13
• Blast from the past — 2009-06-17
• Bikini blast — 2009-06-11
• Mushroom producer, for short — 2009-04-14
• Big shock wave producer, briefly — 2009-04-11
• "This is only ___" — 2009-04-07
• Historic 1940s event, for short — 2008-12-24
• Bikini event — 2008-10-15
• It might lead to a cloud formation, for short — 2008-08-03
• Cold war-era blast, in headlines — 2008-07-29
• "This is only ___" — 2008-07-21
• Alamogordo trial — 2008-06-04
• "This is only ___" — 2008-06-02
• Event in 1940s-'50s headlines — 2008-02-13
• Historically significant trial — 2008-01-12
• Bikini event, once — 2007-11-28
• 1940s Bikini blast, in brief — 2007-06-04
• Defense initiative, for short — 2006-12-03
• Controversial 50's event — 2005-12-18
• Treaty topic — 2005-07-22
• "This is ___ …" (radio announcement) — 2005-01-24
• Blast from the past? — 2005-01-05
• "This is only ___" — 2004-12-20
• Bomb trial — 2004-06-20
• Bikini event, in old headlines — 2003-12-09
• Onetime Marshall Isl. event — 2003-10-26
• Blast from the past — 2003-03-22
• Nuclear event, in headlines — 2002-12-22
• 1948 event dubbed "Operation Sandstone" — 2002-11-17
• Big bang source — 2002-06-21