Historical clue formulations

• Critical warning — 2022-05-15
• Colorful warning — 2022-04-23
• Emergency alert — 2019-05-03
• [Emergency!] — 2016-09-24
• Emergency status — 2015-04-30
• Emergency situation — 2006-04-02
• Emergency situation — 2002-12-23
• Serious warning — 2001-10-06
• Emergency indicator — 1994-12-28